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Ye J, Feng J, Li X, Qu G, Lei Z, Jiang H, Sun Y, Zhang R, Shen A, Wan Z, Gan Y, Liu C. Public trust in general practitioners and its association with primary care contracts: a cross-sectional study of community residents in China. Public Health 2024; 231:55-63. [PMID: 38626672 DOI: 10.1016/j.puhe.2024.03.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 03/13/2024] [Accepted: 03/13/2024] [Indexed: 04/18/2024]
Abstract
OBJECTIVES This study aimed to assess the level of public trust in general practitioners (GPs) and its association with primary care contract services (PCCS) in China. STUDY DESIGN Cross-sectional study. METHODS Between September and December 2021, 4158 residents across eastern, central, and western China completed a structured self-administered questionnaire. Trust was assessed using the Chinese version of Wake Forest Physician Trust Scale. Multivariable linear regression models were established to identify predictors of trust. The effect size of PCCS on trust was estimated by the average treatment effect for the treated (ATT) through propensity score matching. RESULTS The study participants had a mean Wake Forest Physician Trust Scale score of 36.82 (standard deviation = 5.45). Enrollment with PCCS (β = 0.14, P < 0.01), Han ethnicity (β = 0.03, P < 0.05), lower educational attainment (β = -0.06, P < 0.01), higher individual monthly income (β = 0.03, P < 0.05), better self-rated health (β = 0.04, P < 0.05), chronic conditions (β = 0.07, P < 0.01), and higher familiarity with primary care services (β = 0.12, P < 0.01) and PCCS (β = 0.21, P < 0.01) were associated with higher trust in GPs. The ATT of PCCS exceeded 1 (P < 0.05). CONCLUSIONS PCCS are associated with higher levels of trust in GPs. PCCS may become an effective tool to attract public trust in GPs, although the relationship between the two may be bi-directional.
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Affiliation(s)
- Jun Ye
- Department of Public Management, College of Medical Humanities and Management, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Jing Feng
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xinyan Li
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Ge Qu
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Zihui Lei
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Heng Jiang
- Department of Public Health, School of Psychology and Public Health, La Trobe University, Melbourne, Victoria, Australia; Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Victoria, Australia
| | - Yuchao Sun
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Ruofan Zhang
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Aoqi Shen
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Zhengyi Wan
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Yong Gan
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China.
| | - Chaojie Liu
- Department of Public Health, School of Psychology and Public Health, La Trobe University, Melbourne, Victoria, Australia.
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Li X, Li C, Qu G, Yuan B, Sun Z. Engineering of a Baeyer-Villiger monooxygenase to improve substrate scope, stereoselectivity and regioselectivity. Chembiochem 2024:e202400328. [PMID: 38742991 DOI: 10.1002/cbic.202400328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 05/12/2024] [Accepted: 05/14/2024] [Indexed: 05/16/2024]
Abstract
Baeyer-Villiger monooxygenases belong to a family of flavin-binding proteins that catalyze the Baeyer-Villiger (BV) oxidation of ketones to produce lactones or esters, which are important intermediates in pharmaceuticals or sustainable materials. Phenylacetone monooxygenase (PAMO) from Thermobifida fusca with moderate thermostability catalyzes the oxidation of aryl ketone substrates, but is limited by high specificity and narrow substrate scope. In the present study, we applied loop optimization by loop swapping followed by focused saturation mutagenesis in order to evolve PAMO mutants capable of catalyzing the regioselective BV oxidation of cyclohexanone and cyclobutanone derivatives with formation of either normal or abnormal esters or lactones. We further modulated PAMO to increase enantioselectivity. Crystal structure studies indicate that rotation occurs in the NADP-binding domain and that the high B-factor region is predominantly distributed in the catalytic pocket residues. Computational analyses further revealed dynamic character in the catalytic pocket and reshaped hydrogen bond interaction networks, which is more favorable for substrate binding. Our study provides useful insights for studying enzyme-substrate adaptations.
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Affiliation(s)
- Xu Li
- Chinese Academy of Sciences, Tianjin Institute of Industrial Biotechnology, 32 West 7th Avenue, Tianjin Airport Economic Area, 300308, Tianjin, CHINA
| | - Congcong Li
- Chinese Academy of Sciences, Tianjin Institute of Industrial Biotechnology, CHINA
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, Tianjin Institute of Industrial Biotechnology, CHINA
| | - Bo Yuan
- Chinese Academy of Sciences, Tianjin Institute of Industrial Biotechnology, CHINA
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, National Enyzme Engineering Lab, 32 West 7th Avenue, Tianjin Airport Economic Area, 300308, Tianjin, CHINA
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Ren Y, Qin Z, Li C, Yuan B, Yang Y, Qu G, Sun Z. Engineering the activity and thermostability of a carboxylic acid reductase in the conversion of vanillic acid to vanillin. J Biotechnol 2024; 386:19-27. [PMID: 38521166 DOI: 10.1016/j.jbiotec.2024.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 03/11/2024] [Accepted: 03/12/2024] [Indexed: 03/25/2024]
Abstract
Vanillin is a valuable natural product that can be used as a fragrance and additive. Recent research in the biosynthesis of vanillin has brought attention to a key enzyme, carboxylic acid reductase (CAR), which catalyzes the reduction of vanillic acid to vanillin. Nevertheless, the biosynthesis of vanillin is hampered by the low activity and stability of CAR. As such, a rational design campaign was conducted on a well-documented carboxylic acid reductase from Segniliparus rugosus (SrCAR), using vanillic acid as the model substrate. After combined active site saturation and iterative site-specific mutagenesis, the best quadruple mutant N292H/K524S/A627L/E1121W (M3) was successfully obtained. In comparison to the wildtype SrCAR, M3 demonstrated a 4.2-fold increase in catalytic efficiency (kcat/Km), and its half-life (t1/2) was enhanced by 3.8 times up to 385.08 minutes at 40 °C. In silico docking and molecular dynamics simulation provided insights into the improved activity and stability. In the subsequent preparative-scale reaction with 100 mM (16.8 g L-1) vanillic acid, the whole cell catalysis utilizing M3 produced 10.15 g·L-1 of vanillin and 1.11 g·L-1 of vanillyl alcohol, respectively. This work demonstrates a dual improvement in the activity and thermal stability of SrCAR, thereby potentially facilitating the application of carboxylic acid reductase in the biosynthesis of vanillin.
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Affiliation(s)
- Yaoyao Ren
- Tianjin University of Science and Technology, College of Biotechnology, Tianjin 300457, China; Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China; National Center of Technology Innovation for Synthetic Biology, Tianjin 300308, China
| | - Zongmin Qin
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China; National Center of Technology Innovation for Synthetic Biology, Tianjin 300308, China
| | - Congcong Li
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China; National Center of Technology Innovation for Synthetic Biology, Tianjin 300308, China
| | - Bo Yuan
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China; National Center of Technology Innovation for Synthetic Biology, Tianjin 300308, China; Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Yang Yang
- Tianjin University of Science and Technology, College of Biotechnology, Tianjin 300457, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China; National Center of Technology Innovation for Synthetic Biology, Tianjin 300308, China; Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China; National Center of Technology Innovation for Synthetic Biology, Tianjin 300308, China; Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
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4
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Wang Q, Li C, Yuan B, Yu A, Qu G, Sun Z. Engineering the Activity of a Newly Identified Arylalkylamine N-Acetyltransferase in the Acetylation of 5-Hydroxytryptamine. Chembiochem 2024; 25:e202400069. [PMID: 38504591 DOI: 10.1002/cbic.202400069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 03/15/2024] [Accepted: 03/19/2024] [Indexed: 03/21/2024]
Abstract
Arylalkylamine N-acetyltransferase (AANAT) serves as a key enzyme in the biosynthesis of melatonin by transforming 5-hydroxytryptamine (5-HT) to N-acetyl-5-hydroxytryptamine (NAS), while its low activity may hinder melatonin yield. In this study, a novel AANAT derived from Sus scrofa (SsAANAT) was identified through data mining using 5-HT as a model substrate, and a rational design of SsAANAT was conducted in the quest to improving its activity. After four rounds of mutagenesis procedures, a triple combinatorial dominant mutant M3 was successfully obtained. Compared to the parent enzyme, the conversion of the whole-cell reaction bearing the best variant M3 exhibted an increase from 50 % to 99 % in the transformation of 5-HT into NAS. Additionally, its catalytic efficiency (kcat/Km) was enhanced by 2-fold while retaining the thermostability (Tm>45 °C). In the up-scaled reaction with a substrate loading of 50 mM, the whole-cell system incorporating variant M3 achieved a 99 % conversion of 5-HT in 30 h with an 80 % yield. Molecular dynamics simulations were ultilized to shed light on the origin of improved activity. This study broadens the repertoire of AANAT for the efficient biosynthesis of melatonin.
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Affiliation(s)
- Qing Wang
- College of Biotechnology, Tianjin University of Science and Technology, 300457, Tianjin, China
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 300308, Tianjin, China
- National Center of Technology Innovation for Synthetic Biology, 300308, Tianjin, China
| | - Congcong Li
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 300308, Tianjin, China
- National Center of Technology Innovation for Synthetic Biology, 300308, Tianjin, China
| | - Bo Yuan
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 300308, Tianjin, China
- National Center of Technology Innovation for Synthetic Biology, 300308, Tianjin, China
- Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 300308, Tianjin, China
| | - Aiqun Yu
- College of Biotechnology, Tianjin University of Science and Technology, 300457, Tianjin, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 300308, Tianjin, China
- National Center of Technology Innovation for Synthetic Biology, 300308, Tianjin, China
- Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 300308, Tianjin, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 300308, Tianjin, China
- National Center of Technology Innovation for Synthetic Biology, 300308, Tianjin, China
- Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 300308, Tianjin, China
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5
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Qu G, Zhang H, Qian R. The learning curve of a bronchus-first method in bi-port video-assisted thoracoscopic surgery for left upper lobe lung cancer. Updates Surg 2024:10.1007/s13304-024-01826-2. [PMID: 38575804 DOI: 10.1007/s13304-024-01826-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 03/06/2024] [Indexed: 04/06/2024]
Abstract
Video-assisted thoracic surgery (VATS) has been widely used in lung cancer treatment. However, VATS left upper lobectomy (LUL) is complex due to the intricate branching pattern of the left pulmonary artery (PA). Nevertheless, VATS right upper lobectomy can be simplified through a bronchus-first and simultaneous vessel stapling technique. In this study, the learning curve was obtained while ensuring favorable oncological outcomes using bronchus-first method for VATS LUL. First, retrospective data of 148 consecutive patients who underwent VATS LUL (bronchus-first method) for non-small cell lung cancer (NSCLC) from March 2018 to October 2020 were analyzed. The learning curve was then assessed via cumulative sum (CUSUM) analysis. Moreover, data at different stages of the learning curve, including operation time, blood loss, postoperative hospital stay, lymph node harvested, thoracotomy conversion, postoperative complications, endoscopic stapler consumptions, and 3 year overall survival, were recorded. The learning curve was best modeled as the equation: y = - 7.78 + 2.05x-2.23 × 10-2x2 + 6.43 × 10-5x3, with a good-to-fit test R2 = 0.97. The surgeon entered the proficient stage (59th case-148th case) after consecutive operations of 58 cases (learning stage, 1st case-58th case). Notably, more lymph nodes were harvested in the proficient stage than in the learning stage (17.69 ± 1.47 vs. 15.53 ± 1.43, P < 0.01). Compared with the learning stage, the proficient stage was associated with shorter operation time (114.28 ± 8.56 min vs. 126.81 ± 7.30 min, P < 0.01), fewer blood loss (44.22 ± 7.75 mL vs. 57.41 ± 22.98 mL, P < 0.01), shorter postoperative hospital stay (6.02 ± 0.99 d vs. 7.22 ± 1.34 d, P < 0.01), and fewer endoscopic stapler consumptions (5.89 ± 0.64 vs. 6.53 ± 0.50, P < 0.01). However, thoracotomy conversion (4/90 vs. 5/58, P = 0.32), postoperative complications (10/90 vs. 11/58, P = 0.23) and 3 year overall survival (62.2% vs. 50.8%, log-rank test, P = 0.11) showed no significant difference between the two stages. The surgeon with former single-direction VATS lobectomy experience can master bronchus-first VATS LUL after attending to 58 cases.
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Affiliation(s)
- Ge Qu
- Department of Thoracic Surgery, Henan Provincial Chest Hospital, Chest Hospital of Zhengzhou University, Zhengzhou, 450000, China
| | - Heng Zhang
- Department of Thoracic Surgery, Henan Provincial Chest Hospital, Chest Hospital of Zhengzhou University, Zhengzhou, 450000, China
| | - Rulin Qian
- Department of Thoracic Surgery, Henan Provincial Chest Hospital, Chest Hospital of Zhengzhou University, Zhengzhou, 450000, China.
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6
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Ye M, Li C, Xiao D, Qu G, Yuan B, Sun Z. Atroposelective Synthesis of Aldehydes via Alcohol Dehydrogenase-Catalyzed Stereodivergent Desymmetrization. JACS Au 2024; 4:411-418. [PMID: 38425895 PMCID: PMC10900225 DOI: 10.1021/jacsau.3c00814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 01/19/2024] [Accepted: 01/22/2024] [Indexed: 03/02/2024]
Abstract
Axially chiral aldehydes have emerged recently as a unique class of motifs for drug design. However, few biocatalytic strategies have been reported to construct structurally diverse atropisomeric aldehydes. Herein, we describe the characterization of alcohol dehydrogenases to catalyze atroposelective desymmetrization of the biaryl dialdehydes. Investigations into the interactions between the substrate and key residues of the enzymes revealed the distinct origin of atroposelectivity. A panel of 13 atropisomeric monoaldehydes was synthesized with moderate to high enantioselectivity (up to >99% ee) and yields (up to 99%). Further derivatization allows enhancement of the diversity and application potential of the atropisomeric compounds. This study effectively expands the scope of enzymatic synthesis of atropisomeric aldehydes and provides insights into the binding modes and recognition mechanisms of such molecules.
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Affiliation(s)
- Mengjing Ye
- College
of Biotechnology, Tianjin University of
Science and Technology, Tianjin 300457, China
- Tianjin
Institute of Industrial Biotechnology, Chinese
Academy of Sciences, Tianjin 300308, China
| | - Congcong Li
- Tianjin
Institute of Industrial Biotechnology, Chinese
Academy of Sciences, Tianjin 300308, China
- Key
Laboratory of Engineering Biology for Low-Carbon Manufacturing, Chinese Academy of Sciences, 32 West seventh Avenue, Tianjin Airport Economic
Area, Tianjin 300308, China
| | - Dongguang Xiao
- College
of Biotechnology, Tianjin University of
Science and Technology, Tianjin 300457, China
| | - Ge Qu
- Tianjin
Institute of Industrial Biotechnology, Chinese
Academy of Sciences, Tianjin 300308, China
- Key
Laboratory of Engineering Biology for Low-Carbon Manufacturing, Chinese Academy of Sciences, 32 West seventh Avenue, Tianjin Airport Economic
Area, Tianjin 300308, China
| | - Bo Yuan
- Tianjin
Institute of Industrial Biotechnology, Chinese
Academy of Sciences, Tianjin 300308, China
- Key
Laboratory of Engineering Biology for Low-Carbon Manufacturing, Chinese Academy of Sciences, 32 West seventh Avenue, Tianjin Airport Economic
Area, Tianjin 300308, China
| | - Zhoutong Sun
- Tianjin
Institute of Industrial Biotechnology, Chinese
Academy of Sciences, Tianjin 300308, China
- Key
Laboratory of Engineering Biology for Low-Carbon Manufacturing, Chinese Academy of Sciences, 32 West seventh Avenue, Tianjin Airport Economic
Area, Tianjin 300308, China
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Yuan B, Yang D, Qu G, Turner NJ, Sun Z. Biocatalytic reductive aminations with NAD(P)H-dependent enzymes: enzyme discovery, engineering and synthetic applications. Chem Soc Rev 2024; 53:227-262. [PMID: 38059509 DOI: 10.1039/d3cs00391d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
Chiral amines are pivotal building blocks for the pharmaceutical industry. Asymmetric reductive amination is one of the most efficient and atom economic methodologies for the synthesis of optically active amines. Among the various strategies available, NAD(P)H-dependent amine dehydrogenases (AmDHs) and imine reductases (IREDs) are robust enzymes that are available from various sources and capable of utilizing a broad range of substrates with high activities and stereoselectivities. AmDHs and IREDs operate via similar mechanisms, both involving a carbinolamine intermediate followed by hydride transfer from the co-factor. In addition, both groups catalyze the formation of primary and secondary amines utilizing both organic and inorganic amine donors. In this review, we discuss advances in developing AmDHs and IREDs as biocatalysts and focus on evolutionary history, substrate scope and applications of the enzymes to provide an outlook on emerging industrial biotechnologies of chiral amine production.
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Affiliation(s)
- Bo Yuan
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
- Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, China
| | - Dameng Yang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
- Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, China
| | - Nicholas J Turner
- Department of Chemistry, Manchester Institute of Biotechnology, University of Manchester, Manchester M1 7DN, UK.
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
- Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, China
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Dai T, Dai X, Lu H, He T, Li W, Li C, Huang S, Huang Y, Tong C, Qu G, Shan Y, Liang S, Liu D. The impact of climate change and human activities on the change in the net primary productivity of vegetation-taking Sichuan Province as an example. Environ Sci Pollut Res Int 2024; 31:7514-7532. [PMID: 38159188 DOI: 10.1007/s11356-023-31520-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 12/09/2023] [Indexed: 01/03/2024]
Abstract
Vegetation is an essential component of terrestrial ecosystems, influenced by climate change and human activities. Quantifying the relative contributions of climate change and human activities to vegetation dynamics is crucial for addressing global climate change. Sichuan Province is one of the essential ecological functional areas in the upper reaches of the Yangtze River, and its vegetation change is of great significance to the environmental function and ecological security of the Yangtze River Basin and southwest China. In this paper, the modified Carnegie-Ames-Stanford Approach(CASA) model was used to estimate the monthly NPP (Net Primary Productivity) of vegetation in Sichuan Province from 2000 to 2018, and the univariate linear regression analysis was used to analyze the temporal and spatial variation of vegetation NPP in Sichuan Province from 2000 to 2018. In addition, taking vegetation NPP as an index, Pearson correlation analysis, partial correlation analysis, and second-order partial correlation analysis were carried out to quantitatively analyze the contribution of climate change and human activities to vegetation NPP. Finally, the Hurst index and nonparametric Man-Kendall significance test were used to predict the future change trend of vegetation NPP in Sichuan Province. The results show that (1) from 2000 to 2018, the NPP of vegetation in Sichuan Province has a significant increasing trend (Slope = 6.09gC·m-2·a-1), with a multi-year average of 438.72 gC·m-2·a-1, showing a trend of low in the east and high in the middle. The response of vegetation NPP to altitude is different at different elevations; (2) the contribution rates of climate change and human activities to vegetation NPP change are 4.12gC·m-2·a-1 and 1.97gC·m-2·a-1, respectively. In contrast, the impact of human activities on NPP is more significant than climate change. Human activities are the main factors affecting vegetation restoration and degradation in Sichuan Province. However, the positive contribution to NPP change is less than climate change; (3) the future vegetation NPP change trend in Sichuan Province is mainly rising, and the same direction change trend is much larger than the reverse change trend. The areas with an increasing trend in the future account for 89.187% of the total area. This research helps understand the impact of climate change and human activities on vegetation change in Sichuan Province. It offers scientific bases for vegetation restoration and ecosystem management in Sichuan and the surrounding areas.
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Affiliation(s)
- Tangrui Dai
- College of Earth Sciences, Chengdu University of Technology, Chengdu, 610059, China
| | - Xiaoai Dai
- College of Earth Sciences, Chengdu University of Technology, Chengdu, 610059, China.
| | - Heng Lu
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Tao He
- College of Earth Sciences, Chengdu University of Technology, Chengdu, 610059, China
| | - Weile Li
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China
| | - Cheng Li
- College of Earth Sciences, Chengdu University of Technology, Chengdu, 610059, China
| | - Shengqi Huang
- College of Earth Sciences, Chengdu University of Technology, Chengdu, 610059, China
| | - Yiyang Huang
- College of Earth Sciences, Chengdu University of Technology, Chengdu, 610059, China
| | - Chenbo Tong
- College of Earth Sciences, Chengdu University of Technology, Chengdu, 610059, China
| | - Ge Qu
- College of Earth Sciences, Chengdu University of Technology, Chengdu, 610059, China
| | - Yunfeng Shan
- College of Earth Sciences, Chengdu University of Technology, Chengdu, 610059, China
| | - Shuneng Liang
- Land Satellite Remote Sensing Application Center, Ministry of Natural Resources of China, Beijing, 100048, China
| | - Dongsheng Liu
- PIESAT Information Technology Co., Ltd., Beijing, 100195, China
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Li X, Ye J, Feng J, Chen Q, Qu G, Wan Z, Lei Z, Ferrier A, Jiang H, Zheng Y, Gan Y. Willingness to maintain contracts with family doctors among Chinese residents: results from one national cross-sectional study and a meta-analysis of 25 studies. Front Public Health 2023; 11:1162824. [PMID: 38186714 PMCID: PMC10770837 DOI: 10.3389/fpubh.2023.1162824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 12/01/2023] [Indexed: 01/09/2024] Open
Abstract
Background A number of studies have investigated the influencing factors regarding the renewal of contracts associated with Family Doctor Contract Services (FDCS) in different regions of China since it was officially implemented in 2009; however, none of the previous studies have been considered using a nationally representative sample in combination with a meta-analysis. Methods A multistage stratified sampling method was used to investigate participants' socio-demographic characteristics, health status, understanding, use, and evaluation of the FDCS, and their willingness to renew contracts in Eastern, Central, and Western China from September to November 2021. We searched the PubMed, Ovid Medline, CNKI, VIP, Wanfang, and SinoMed databases to retrieve previous studies related to the willingness of Chinese residents to renew contracts with their family doctor (FD), and a meta-analysis was performed to systematically summarize the willingness to maintain contracts and influencing factors. Results Among 2,394 residents, 2,122 (88.64%) were willing to renew their contracts. The mixed-effect logistic regression model results demonstrated that residents who (1) preferred primary health service institutions, (2) had a better knowledge of FDCS, (3) were more willing to visit primary health service after signing the contract with FDs, (4) were not intending to change FDs, (5) were satisfied with FDCS, and (6) trusted in FDs reported a higher level of willingness to maintain contracts with FDs. Our meta-analysis confirmed that older age, being married, having chronic diseases, choosing primary medical institutions for the first contact, having a good knowledge of FDCS/FDs, being satisfied with FDCS and the medical skills of FDs, and trusting FDs were all positively associated with residents' willingness to renew contracts (p < 0.05). Conclusion The willingness of consumers to maintain contracts with FDs in China varies in different areas. Giving priority services to groups of high need contributed to an improved rate of renewal. We suggest that in order to continue to increase annual contract renewal, it is necessary to strengthen consumer awareness through effective marketing and continue to work toward meeting consumer expectations, thereby increasing confidence and trust in FDCS.
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Affiliation(s)
- Xinyan Li
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Jun Ye
- Department of Public Management, School of Public Health and Management, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Jing Feng
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Qiaosen Chen
- Division of Cardiovascular Medicine, Department of Medicine, Karolinska Institutet, Huddinge, Stockholm, Sweden
| | - Ge Qu
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Zhengyi Wan
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Zihui Lei
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Adamm Ferrier
- Department of Public Health, School of Psychology and Public Health, La Trobe University, Melbourne, VIC, Australia
| | - Heng Jiang
- Department of Public Health, School of Psychology and Public Health, La Trobe University, Melbourne, VIC, Australia
- Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC, Australia
| | - Yanling Zheng
- Department of General Practice, Shouyilu Street Community Health Service Center, Wuhan, Hubei, China
| | - Yong Gan
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
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10
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Qu G, Wang K, Mu J, Zhuo J, Wang X, Li S, Ye X, Li Y, Yan Y, Li X. Identifying cis-Acting Elements Associated with the High Activity and Endosperm Specificity of the Promoters of Genes Encoding Low-Molecular-Weight Glutenin Subunits in Common Wheat ( Triticum aestivum). J Agric Food Chem 2023. [PMID: 37919930 DOI: 10.1021/acs.jafc.3c04209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2023]
Abstract
Low-molecular-weight glutenin subunits (LMW-GSs) associated with bread-baking quality and flour nutrient quality accumulate in endosperms of common wheat and related species. However, the mechanism underlying the expression regulation of genes encoding LMW-GSs has not been fully elucidated. In this study, we identified LMW-D2 and LMW-D7, which are highly and weakly expressed, respectively, via the analysis of RNA-sequencing data of Chinese Spring wheat and wheat transgenic lines transformed with 5' deletion promoter fragments and GUS fusion constructs. The 605-bp fragment upstream of the LMW-D2 start codon could drive high levels of GUS expression in the endosperm. The truncated endosperm box located at the -300 site resulted in the loss of LMW-D2 promoter activity, and a single-nucleotide polymorphism on the GCN4 motif was closely related to the expression of LMW-GSs. TCT and TGACG motifs, as well as the others located on the 5' distal end, might also be involved in the transcription regulation of LMW-GSs. In transgenic lines, fusion proteins of LMW-GS and GUS were deposited into protein bodies. Our findings provide new insights into the mechanism underlying the transcription regulation of LMW-GSs and will contribute to the development of wheat endosperm as a bioreactor for the production of nutraceuticals, antibodies, vaccines, and medicinal proteins.
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Affiliation(s)
- Ge Qu
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Ke Wang
- National Wheat Improvement Center, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Junyi Mu
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Jiahui Zhuo
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Xinyu Wang
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Shasha Li
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Xingguo Ye
- National Wheat Improvement Center, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yaxuan Li
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Yueming Yan
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Xiaohui Li
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
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11
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Qu G, Feng J, Lei Z, Li X, Sun Y, Ferrier A, Jiang H, Gan Y. Analysis on the relationship between professional identity and turnover intention among general practitioners: The mediating role of job burnout. J Affect Disord 2023; 339:725-731. [PMID: 37442445 DOI: 10.1016/j.jad.2023.07.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 06/12/2023] [Accepted: 07/08/2023] [Indexed: 07/15/2023]
Abstract
OBJECTIVE We aimed to understand the current situation and contributory factors associated with professional identity, turnover intention and job burnout among general practitioners (GPs) in eastern, central and western China. METHODS A total of 3244 GPs from community health service institutions in 12 provinces of China were recruited, from October 2017 to February 2018. Demographic information such as sex, region and mode of employment was sought, and issues regarding job burnout, professional identity and turnover intention of GPs were measured with the corresponding scale, and softwares such as SPSS and AMOS were used. T-test, analysis of variance, and covariance matrix were used for analysis. RESULTS The average total scores of job burnout, turnover intention and professional identity of GPs in China were 44.12, 15.07 and 51.23, respectively. The results of intermediary effect analysis showed that in the GPs group, there were differences in the distribution of the three indicators. Professional identity had a significant negative effect on job burnout (β = -0.373), while job burnout had a significant positive effect on turnover intention (β = 0.528), and job burnout had an indirect effect in the relationship between professional identity and turnover intention. Job burnout played an intermediary role in professional identity and turnover intention. CONCLUSIONS The turnover intention of GPs in China has improved, but it is still at a high level. Job burnout plays an intermediary role between professional identity and turnover intention.
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Affiliation(s)
- Ge Qu
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Jing Feng
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Zihui Lei
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xinyan Li
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Yuchao Sun
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Adamm Ferrier
- Department of Public Health, School of Psychology and Public Health, La Trobe University, Melbourne, Victoria, Australia
| | - Heng Jiang
- Department of Public Health, School of Psychology and Public Health, La Trobe University, Melbourne, Victoria, Australia; Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Victoria, Australia
| | - Yong Gan
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China.
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12
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Zhang J, Luo X, Zhou R, Dai Z, Guo C, Qu G, Li J, Zhang Z. The axial and sagittal CT values of the 7th thoracic vertebrae in screening for osteoporosis and osteopenia. Clin Radiol 2023; 78:763-771. [PMID: 37573241 DOI: 10.1016/j.crad.2023.07.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 07/06/2023] [Accepted: 07/11/2023] [Indexed: 08/14/2023]
Abstract
AIM To evaluate the difference in computed tomography (CT) attenuation value of different planes of the 7th thoracic vertebra and investigate the efficacy of axial and sagittal vertebral CT measurements in predicting osteoporosis. MATERIALS AND METHODS Patients who underwent routine chest CT and dual-energy X-ray absorptiometry (DXA) within 1 month were included in this retrospective study. The CT attenuation values of different planes were compared. Logistic regression and receiver operating characteristic (ROC) were used to analyse the difference of each plane in the diagnosis of osteoporosis. RESULTS The study included 1,338 patients (mean age of 61.9±11.9; 54% female). The CT attenuation values decreased successively in the normal group, osteopenia group, and osteoporosis group. The paired t-test results showed that the mid-axial measurements were greater than mid-sagittal measurements, with a mean difference of 9 HU, the difference was statistically significant (p<0.001, 95% confidence interval [CI] = 7.8-10.1). For each one-unit reduction in mid-sagittal CT attenuation value, the risk of osteopenia or osteoporosis increased by 3.6%. To distinguish osteoporosis from non-osteoporosis (osteopenia + normal), the sensitivity was 90% and the specificity was 52.4% at the mid-sagittal threshold of 113.7 HU. CONCLUSIONS The CT attenuation values of mid-sagittal plane have higher diagnostic efficacy than axial planes in predicting osteoporosis. For patients with a sagittal CT attenuation value of <113.7 HU in the T7, further DXA examination is warranted.
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Affiliation(s)
- J Zhang
- Department of Orthopedics, The First Hospital of Nanchang, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China; Medical Department of Graduate School, Nanchang University, Nanchang, Jiangxi 330006, China; Nanchang Key Laboratory of Orthopaedics, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China
| | - X Luo
- Department of Orthopedics, The First Hospital of Nanchang, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China; Medical Department of Graduate School, Nanchang University, Nanchang, Jiangxi 330006, China; Nanchang Key Laboratory of Orthopaedics, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China
| | - R Zhou
- Medical Department of Graduate School, Nanchang University, Nanchang, Jiangxi 330006, China
| | - Z Dai
- Department of Orthopedics, The First Hospital of Nanchang, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China; Medical Department of Graduate School, Nanchang University, Nanchang, Jiangxi 330006, China; Nanchang Key Laboratory of Orthopaedics, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China
| | - C Guo
- Department of Orthopedics, The First Hospital of Nanchang, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China; Medical Department of Graduate School, Nanchang University, Nanchang, Jiangxi 330006, China; Nanchang Key Laboratory of Orthopaedics, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China
| | - G Qu
- Department of Orthopedics, The First Hospital of Nanchang, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China; Medical Department of Graduate School, Nanchang University, Nanchang, Jiangxi 330006, China; Nanchang Key Laboratory of Orthopaedics, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China
| | - J Li
- Department of Orthopedics, The First Hospital of Nanchang, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China; Medical Department of Graduate School, Nanchang University, Nanchang, Jiangxi 330006, China; Nanchang Key Laboratory of Orthopaedics, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China
| | - Z Zhang
- Department of Orthopedics, The First Hospital of Nanchang, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China; Nanchang Key Laboratory of Orthopaedics, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, China.
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13
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Liu L, Zhang G, Qu G, Liu B, Zhang X, Li G, Jin N, Li C, Bai J, Zhao C. Effects of dietary Lactobacillus rhamnosus GG supplementation on the production performance, egg quality, eggshell ultrastructure, and lipid metabolism of late-phase laying hens. BMC Vet Res 2023; 19:150. [PMID: 37684610 PMCID: PMC10486122 DOI: 10.1186/s12917-023-03719-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Accepted: 09/02/2023] [Indexed: 09/10/2023] Open
Abstract
BACKGROUND Toward the late phase of laying, the production performance of laying hens decreases, egg quality deteriorates, lipid metabolism weakens, and hepatic lipid accumulation is exacerbated. Probiotics as an alternative to antimicrobials have been employed in poultry-related industries. Lactobacillus rhamnosus GG (LGG) is currently the most researched and clinically validated probiotic, showing promising effects in multiple application areas. However, few studies have been conducted on livestock (including poultry) production. RESULTS Compared with the CON group, the feed conversion ratio (P < 0.01) declined significantly in the LGG group. Eggshell strength (P < 0.001) and eggshell thickness (P < 0.001) were significantly increased by supplementation with LGG in the diet. The height (P < 0.001) and proportion (P < 0.05) of the effective layer and the mammillary knob density (P < 0.01) in the eggshell ultrastructure of the LGG group increased significantly, while the mammillary layer (P < 0.05) and knob width (P < 0.01) decreased significantly. The LGG-treated hens had significantly lower serum concentrations of low-density lipoprotein (P < 0.05), free fatty acids (P < 0.01), and liver triglyceride (P < 0.05) levels than those in the CON group. CONCLUSIONS LGG supplementation significantly decreases the feed conversion ratio, improves eggshell quality by altering the ultrastructure, and improves lipid metabolism in the late laying period.
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Affiliation(s)
- Liming Liu
- College of Animal Science and Technology, Jilin Agricultural Science and Technology University, Jilin, 132101, Jilin, China
| | - Guoqing Zhang
- College of Animal Science and Technology, Jilin Agricultural Science and Technology University, Jilin, 132101, Jilin, China
| | - Ge Qu
- College of Animal Science and Technology, Jilin Agricultural Science and Technology University, Jilin, 132101, Jilin, China
| | - Bin Liu
- College of Animal Science and Technology, Jilin Agricultural Science and Technology University, Jilin, 132101, Jilin, China
- Jilin Genet-Med Biotechnology Co., Ltd, Changchun, 130122, Jilin, China
| | - Xiufeng Zhang
- College of Animal Science and Technology, Jilin Agricultural Science and Technology University, Jilin, 132101, Jilin, China
| | - Gaoqian Li
- College of Animal Science and Technology, Jilin Agricultural Science and Technology University, Jilin, 132101, Jilin, China
| | - Ningyi Jin
- Research Unit of Key Technologies for the Prevention and Control of Virus Zoonoses, Changchun Veterinary Research Institute, Chinese Academy of Medical Sciences, Chinese Academy of Agricultural Sciences, Changchun, 130122, Jilin, China
| | - Chang Li
- Research Unit of Key Technologies for the Prevention and Control of Virus Zoonoses, Changchun Veterinary Research Institute, Chinese Academy of Medical Sciences, Chinese Academy of Agricultural Sciences, Changchun, 130122, Jilin, China
| | - Jieying Bai
- Jilin Genet-Med Biotechnology Co., Ltd, Changchun, 130122, Jilin, China
- College of Future Technology, Peking University, Beijing, 100871, China
| | - Cuiqing Zhao
- College of Animal Science and Technology, Jilin Agricultural Science and Technology University, Jilin, 132101, Jilin, China.
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14
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Yang Z, Dai X, Lu H, Liu C, Nie R, Zhang M, Ma L, Li N, Liu T, He Y, Yang Z, Qu G, Li W, Wang Y. Evaluation and prediction of water conservation of the Yellow river basin in Sichuan Province, China, based on Google Earth Engine and CA-Markov. Heliyon 2023; 9:e17903. [PMID: 37539201 PMCID: PMC10395299 DOI: 10.1016/j.heliyon.2023.e17903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Revised: 06/30/2023] [Accepted: 06/30/2023] [Indexed: 08/05/2023] Open
Abstract
The Yellow River Basin in China has the world's most serious soil erosion problem. The Yellow River Basin in Sichuan Province (YRS), as the upper reaches of the Yellow River, and its water conservation (WC) capacity greatly affects the ecological environment of the downstream basin. In recent years, YRS has received more and more attention, and numerous policies have been developed to improve local WC. However, there is a vacancy in the long-term research of WC in the YRS due to the lack of in-situ data. This study quantitatively evaluated the WC of YRS from 2001 to 2020 through Google Earth Engine (GEE) and analyzed the spatio-temporal variations of WC and land cover (LC). CA-Markov predicted the LC and WC in 2025 under three scenarios to assess the contribution of different scenarios to WC. The WC in YRS fluctuated from 1.93 to 6.77 billion m3. The climate is the dominant factor of WC change, but the effect of LC on WC is also evident. The WC capacity increases with vegetation coverage and height. The WC capacity of forests per km2 exceeds 600 mm, while that of grasslands is about 250 mm, and barren can cause around 300 mm of WC loss. In 2025, the WC in YRS may exceed 7.5 billion m3, but the past ecological management mode should be transformed. Improving the quality of land use and converting grasslands to forests is better than reducing cropland to improve WC.
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Affiliation(s)
- Zhichong Yang
- College of Earth Science, Chengdu University of Technology, Chengdu 610059, China
| | - Xiaoai Dai
- College of Earth Science, Chengdu University of Technology, Chengdu 610059, China
| | - Heng Lu
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
- College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China
| | - Chao Liu
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
- College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China
| | - Ruihua Nie
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
- College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China
| | - Min Zhang
- School of Environmental and Geographical Sciences, Shanghai Normal University, Shanghai 200234, China
| | - Lei Ma
- School of Geography and Ocean Science, Nanjing University, Nanjing 210093, China
| | - Naiwen Li
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
- College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China
| | - Tiegang Liu
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
- College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China
| | - Yuxin He
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
- College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China
| | - Zhengli Yang
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
- College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China
| | - Ge Qu
- College of Earth Science, Chengdu University of Technology, Chengdu 610059, China
| | - Weile Li
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China
| | - Youlin Wang
- Northwest Engineering Corporation Limited, Xi'an 710065, China
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15
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Zhuo J, Wang K, Wang N, Xing C, Peng D, Wang X, Qu G, Kang C, Ye X, Li Y, Yan Y, Li X. Pericarp starch metabolism is associated with caryopsis development and endosperm starch accumulation in common wheat. Plant Sci 2023; 330:111622. [PMID: 36731749 DOI: 10.1016/j.plantsci.2023.111622] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 12/22/2022] [Accepted: 01/29/2023] [Indexed: 06/18/2023]
Abstract
The wheat pericarp is the main component of the caryopsis at the early development stage and ultimately converts into a tissue that covers the mature caryopsis. A large number of starch granules are accumulated in the pericarp, but the production of and the role of starch granules in caryopsis development remain- elusive. In the present study, the relationship between accumulated starch granules and starch metabolism-related genes in wheat pericarp was investigated using paraffin section observations, expression analysis, and mutant analysis. Starch synthesis is initiated before anthesis and is dependent on a sucrose uptake and conversion system similar to that in the endosperm. TaPTST2 is required to initiate the production of pericarp starch granules. Pericarp starch granules gradually disappeared at the filling stage with high expression levels of genes encoding β-amylase, sucrose-phosphate synthase, and sucrose-phosphate phosphatase. As a maternal tissue adjacent to the endosperm and embryo, the pericarp plays a temporary reservoir for excess nutrients delivered into the caryopsis during the early development stage and exported at the filling stage. The pericarp contributes to the development of the endosperm and embryo as well as the accumulation of endosperm starch. The metabolism of pericarp starch may affect the weight of the wheat caryopsis.
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Affiliation(s)
- Jiahui Zhuo
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Ke Wang
- National Wheat Improvement Center, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Ning Wang
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Caihong Xing
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Da Peng
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Xinyu Wang
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Ge Qu
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Caiyun Kang
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Xingguo Ye
- National Wheat Improvement Center, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yaxuan Li
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Yueming Yan
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China
| | - Xiaohui Li
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing 100048, China.
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16
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Chen Q, Qu G, Li X, Feng M, Yang F, Li Y, Li J, Tong F, Song S, Wang Y, Sun Z, Luo G. Active and stable alcohol dehydrogenase-assembled hydrogels via synergistic bridging of triazoles and metal ions. Nat Commun 2023; 14:2117. [PMID: 37055470 PMCID: PMC10102205 DOI: 10.1038/s41467-023-37921-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 04/05/2023] [Indexed: 04/15/2023] Open
Abstract
Biocatalysis is increasingly replacing traditional methods of manufacturing fine chemicals due to its green, mild, and highly selective nature, but biocatalysts, such as enzymes, are generally costly, fragile, and difficult to recycle. Immobilization provides protection for the enzyme and enables its convenient reuse, which makes immobilized enzymes promising heterogeneous biocatalysts; however, their industrial applications are limited by the low specific activity and poor stability. Herein, we report a feasible strategy utilizing the synergistic bridging of triazoles and metal ions to induce the formation of porous enzyme-assembled hydrogels with increased activity. The catalytic efficiency of the prepared enzyme-assembled hydrogels toward acetophenone reduction is 6.3 times higher than that of the free enzyme, and the reusability is confirmed by the high residual catalytic activity after 12 cycles of use. A near-atomic resolution (2.1 Å) structure of the hydrogel enzyme is successfully analyzed via cryogenic electron microscopy, which indicates a structure-property relationship for the enhanced performance. In addition, the possible mechanism of gel formation is elucidated, revealing the indispensability of triazoles and metal ions, which guides the use of two other enzymes to prepare enzyme-assembled hydrogels capable of good reusability. The described strategy can pave the way for the development of practical catalytic biomaterials and immobilized biocatalysts.
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Affiliation(s)
- Qiang Chen
- The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Xu Li
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Mingjian Feng
- The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
| | - Fan Yang
- Technology Center for Protein Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Yanjie Li
- Technology Center for Protein Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Jincheng Li
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Feifei Tong
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Shiyi Song
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Yujun Wang
- The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.
| | - Guangsheng Luo
- The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
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17
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Shi G, Zhang X, Qu G, Chen Z. Classification of Rice Varieties Using SIMCA Applied to NIR Spectroscopic Data. ACS Omega 2022; 7:46623-46628. [PMID: 36570259 PMCID: PMC9774330 DOI: 10.1021/acsomega.2c05561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
The selection of suitable rice varieties is the key to achieve high and stable yields, and the correct identification of rice varieties is the prerequisite for seed selection. In this paper, with Kenjing No.5, No.6, and No.9 as the subjects, the effectiveness of near-infrared spectroscopy (NIRS) combined with soft independent modeling of class analogy (SIMCA) in the rapid identification of rice varieties was explored. The modeling sets of Kenjing No.5, No.6, and No.9 samples were respectively used to establish a SIMCA classification model based on principal component analysis (PCA). The accuracies of the model in classifying the rice samples in the modeling set were 100, 100, and 97.5%, respectively. Then, the established SIMCA model was used to identify the rice samples in the test set. According to the experimental findings, the SIMCA analytical method achieved 100% prediction accuracy for the Kenjing No.5, Kenjing No.6, and Hongyu 001-1 samples. For the Kenjing No.9 sample, the accuracy rate was 90% with a 10% sample of Kenjing No.9 misidentified as Kenjing No.6. Therefore, the analytical method of NIRS combined with SIMCA could effectively identify the rice varieties, providing a new approach for the correct selection of planting varieties.
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18
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Li JK, Qu G, Li X, Tian Y, Cui C, Zhang FG, Zhang W, Ma JA, Reetz MT, Sun Z. Rational enzyme design for enabling biocatalytic Baldwin cyclization and asymmetric synthesis of chiral heterocycles. Nat Commun 2022; 13:7813. [PMID: 36535947 PMCID: PMC9763437 DOI: 10.1038/s41467-022-35468-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Accepted: 12/05/2022] [Indexed: 12/23/2022] Open
Abstract
Chiral heterocyclic compounds are needed for important medicinal applications. We report an in silico strategy for the biocatalytic synthesis of chiral N- and O-heterocycles via Baldwin cyclization modes of hydroxy- and amino-substituted epoxides and oxetanes using the limonene epoxide hydrolase from Rhodococcus erythropolis. This enzyme normally catalyzes hydrolysis with formation of vicinal diols. Firstly, the required shutdown of the undesired natural water-mediated ring-opening is achieved by rational mutagenesis of the active site. In silico enzyme design is then continued with generation of the improved mutants. These variants prove to be versatile catalysts for preparing chiral N- and O-heterocycles with up to 99% conversion, and enantiomeric ratios up to 99:1. Crystal structural data and computational modeling reveal that Baldwin-type cyclizations, catalyzed by the reprogrammed enzyme, are enabled by reshaping the active-site environment that directs the distal RHN and HO-substituents to be intramolecular nucleophiles.
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Affiliation(s)
- Jun-Kuan Li
- grid.33763.320000 0004 1761 2484Department of Chemistry, Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin University, Tianjin, 300072 China ,grid.9227.e0000000119573309Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308 China
| | - Ge Qu
- grid.9227.e0000000119573309Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308 China ,National Technology Innovation Center of Synthetic Biology, Tianjin, 300308 China
| | - Xu Li
- grid.9227.e0000000119573309Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308 China ,National Technology Innovation Center of Synthetic Biology, Tianjin, 300308 China
| | - Yuchen Tian
- grid.33763.320000 0004 1761 2484Department of Chemistry, Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin University, Tianjin, 300072 China
| | - Chengsen Cui
- grid.9227.e0000000119573309Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308 China ,National Technology Innovation Center of Synthetic Biology, Tianjin, 300308 China
| | - Fa-Guang Zhang
- grid.33763.320000 0004 1761 2484Department of Chemistry, Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin University, Tianjin, 300072 China
| | - Wuyuan Zhang
- grid.9227.e0000000119573309Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308 China ,National Technology Innovation Center of Synthetic Biology, Tianjin, 300308 China
| | - Jun-An Ma
- grid.33763.320000 0004 1761 2484Department of Chemistry, Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin University, Tianjin, 300072 China
| | - Manfred T. Reetz
- grid.9227.e0000000119573309Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308 China ,grid.419607.d0000 0001 2096 9941Biocatalysis Section, Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Zhoutong Sun
- grid.9227.e0000000119573309Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308 China ,National Technology Innovation Center of Synthetic Biology, Tianjin, 300308 China
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19
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Qu G, Yuan B, Sun Z. [Rational design and applications of industrial proteins]. Sheng Wu Gong Cheng Xue Bao 2022; 38:4068-4080. [PMID: 37699678 DOI: 10.13345/j.cjb.220586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 09/14/2023]
Abstract
As one of the underlying core technologies in the fields of synthetic biology and green bio-manufacturing, rational protein design is able to effectively solve generic challenges, e.g., improving insufficient performance of natural enzymes, and creating high-performance artificial enzymes. On the occasion of the 10th anniversary of the founding of the Tianjin Institute of Industrial Biotechnology (TIB), Chinese Academy of Sciences, this paper reviews the important progress of TIB achieved in rational design of industrial proteins, from the development of enzyme design methodology, the design of new enzyme reactions, to the applications of biocatalysis, and prospects future trends of this field. It is hoped that this will build a bridge between academia and industry on the rational design of enzymes, promote the development and application of new technologies and strategies. This will help merging the basic research and industrial application, thereby advancing the bio-manufacturing technological innovation.
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Affiliation(s)
- Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Science, Tianjin 300308, China
- National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China
| | - Bo Yuan
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Science, Tianjin 300308, China
- National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Science, Tianjin 300308, China
- National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China
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20
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Feng J, Sang W, Lei Z, Qu G, Li X, Ferrier A, Jiang H, Pu B, Gan Y. The impact of burnout on turnover intention among Chinese general practitioners: The mediating effect of job satisfaction and the moderating effect of professional identity. Int J Soc Psychiatry 2022; 69:705-713. [PMID: 36352818 DOI: 10.1177/00207640221133939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND Turnover among general practitioners (GPs) has become a significant public health concern worldwide. AIMS This study aimed to investigate the interrelationships between job satisfaction, professional identity, burnout, and turnover intention among GPs in China and to assess the mediating effect of job satisfaction on the association between burnout and turnover intention and the moderating effect of professional identity on the association between burnout and job satisfaction. METHOD A cross-sectional study was conducted to collect data from 3,236 GPs in eastern, central, and western China between October 2017 and February 2018 using a self-administered questionnaire. Pearson's correlation analysis and hierarchical regression were used to identify the relationships between job satisfaction, professional identity, burnout, and turnover intention among Chinese GPs. RESULTS Among these respondents, 65.02% reported a medium or high level of emotional exhaustion (EE), 35.38% reported a moderate or high level of depersonalization (DP), and 62.05% reported reduced personal achievement (PA). Overall, 71.08% of GPs expressed a relatively high intention to seek another position (turnover intention). We found all 3 dimensions of burnout contributed to job dissatisfaction while turnover intention arising from burnout was associated with EE and DP. Job satisfaction had a direct negative impact on turnover intention and partially mediated the impact of EE and DP on turnover intention. Professional identity played a partial moderated role between EE and job satisfaction. CONCLUSIONS The prevalence of burnout and turnover intention among GPs is high in China. The effect of EE and DP on turnover intention is mediated by job satisfaction, and the effect of EE on job satisfaction is moderated by professional identity.
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Affiliation(s)
- Jing Feng
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Wenyuan Sang
- School of Business and Tourism, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Zihui Lei
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Ge Qu
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xinyan Li
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Adamm Ferrier
- Department of Public Health, School of Psychology and Public Health, La Trobe University, Melbourne, Victoria, Australia
| | - Heng Jiang
- Department of Public Health, School of Psychology and Public Health, La Trobe University, Melbourne, Victoria, Australia.,Centre for Health Equity, Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Victoria, Australia
| | - Bo Pu
- School of Business and Tourism, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Yong Gan
- Department of Social Medicine and Health Management, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
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21
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Jiang F, Dai X, Xie Z, Xu T, Yin S, Qu G, Yang S, Zhang Y, Yang Z, Xu J, Hou Z. Flood inundation evolution of barrier lake and evaluation of regional ecological spatiotemporal response-a case study of Sichuan-Tibet region. Environ Sci Pollut Res Int 2022; 29:71290-71310. [PMID: 35597834 DOI: 10.1007/s11356-022-20866-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
The Himalayan volcanic earthquake zone has significantly impacted China's Sichuan-Tibet region. Many barriers have formed as a result of the earthquake and secondary disasters, such as landslides, which have blocked the river. The breach of the barrier lake seriously threatens the lives and property safety of downstream personnel. There has been little research on the surrounding ecology for the later treatment of the barrier lake. This paper aims to scientifically predict the risk of dam break in a barrier lake as well as to explore its impact on the ecological environment and put forward controllable measures. Based on four major barrier lake events in the Sichuan-Tibet area, Diexihaizi, Tangjiashan barrier lake, and so on, we extract water bodies from remote sensing images and use the HEC-RAS (Hydrologic Engineering Center of River Analysis System) model to investigate whether there is a dam break risk and the route of the dam break is predictable. Simultaneously, from 1990 to 2020, the smallest administrative region is located. The InVEST (Integrated Valuation of Ecosystem Services and Tradeoffs) model is utilized to evaluate and analyze its habitat and create an evaluation based on flood inundation data. The results suggest that a stable barrier lake (such as Diexihaizi) has a sound effect on the habitat quality index following engineering treatment. The development of the barrier lake has altered the types of neighboring lands used and the natural patterns of the region's landscape. The habitat quality index will marginally deteriorate within a 1-km radius of the barrier lake. However, the quality of habitats in the area ranging within 3 km and 5 km has improved. It is necessary to discharge and strengthen the barrier lake artificially. Human-controlled regions, according to studies, will recover higher habitat quality index values than other locations. Whether the barrier lake has a positive impact on the surrounding area, on the other hand, is primarily dependent on the original ecology. The development of barrier lakes is damaging and unprofitable in Tibet, where the actual ecology is better in the short term. Still, in Sichuan Province, where the habitat quality is relatively low, the appearance of dammed lakes has played a role in correcting the ecology.
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Affiliation(s)
- Fengshan Jiang
- School of Earth Sciences, Yunnan University, Kunming, 650504, China
- School of Earth Sciences, Chengdu University of Technology, Chengdu, 610051, China
| | - Xiaoai Dai
- School of Earth Sciences, Chengdu University of Technology, Chengdu, 610051, China.
| | - Zhiqiang Xie
- School of Earth Sciences, Yunnan University, Kunming, 650504, China
- Institute of International Rivers and Eco-Security, Yunnan University, Kunming, 650504, China
| | - Tong Xu
- School of Earth Sciences, Yunnan University, Kunming, 650504, China
| | - Siqiao Yin
- Institute of International Rivers and Eco-Security, Yunnan University, Kunming, 650504, China
| | - Ge Qu
- School of Earth Sciences, Chengdu University of Technology, Chengdu, 610051, China
| | - Shouquan Yang
- Institute of International Rivers and Eco-Security, Yunnan University, Kunming, 650504, China
| | - Yangbin Zhang
- Institute of International Rivers and Eco-Security, Yunnan University, Kunming, 650504, China
| | - Zhibing Yang
- Institute of International Rivers and Eco-Security, Yunnan University, Kunming, 650504, China
| | - Jiarui Xu
- Institute of International Rivers and Eco-Security, Yunnan University, Kunming, 650504, China
| | - Zhiqun Hou
- School of Earth Sciences, Chengdu University of Technology, Chengdu, 610051, China
- Kunming Institute of Surveying and Mapping, Kunming, 650504, China
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22
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Hu C, Qu G, Zhang Y. Pigeon-inspired fuzzy multi-objective task allocation of unmanned aerial vehicles for multi-target tracking. Appl Soft Comput 2022. [DOI: 10.1016/j.asoc.2022.109310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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23
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Wang N, Xing C, Qu G, Zhuo J, Wang X, Li Y, Yan Y, Li X. New insight into the sucrose biosynthesis pathway from genome-wide identification, gene expression analysis, and subcellular localization in hexaploid wheat (Triticum aestivum L.). J Plant Physiol 2022; 276:153770. [PMID: 35932649 DOI: 10.1016/j.jplph.2022.153770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 07/12/2022] [Accepted: 07/12/2022] [Indexed: 06/15/2023]
Abstract
Sucrose, the main synthesized product and transported form of photoassimilates, moves from leaves to support plant growth and storage substance biosynthesis occurring in the heterotrophic sink organs. Enhancing sucrose biosynthesis efficiency is a top priority for crop yield breeding programs. However, the molecular mechanism of sucrose biosynthesis is still elusive, especially in wheat. We performed transcriptome sequencing, subcellular localization, and bioinformatics analysis to identify key isoforms and metabolic branches associated with sucrose biosynthesis in wheat. Our analysis identified 45 genes from 13 families that exhibited high expression in young leaves with an evident diurnal change. The carbon flux from photoassimilates to sucrose was divided into two pathways. In the cytoplasm, assimilates initiating at phosphotrioses (TPs) exported by TaTPT1 from chloroplasts flowed along the TP-Sucrose branch formed by TaALD6, TaFBP5, TacPGI, TacPGM, TaUGP1, TaSPS5, and TaSPP1. Intermediates either from the Calvin cycle or TP-Sucrose branch were converted into ADPGlc to synthesize the simple starch, which was transiently degraded by a series of enzymes, including TaBAM4 and TaSEX4 in the chloroplast. Similar to the starch-biosynthesis branch in endosperms, the TP-Sucrose branch is the most prominent in leaves because each reaction can be catalyzed by at least one highly expressed isoform with expected cytosolic localization. The key isoforms and major branches highlighted in the wheat sucrose biosynthesis pathway expand our molecular understanding of crop sucrose biosynthesis and provide clues to increase wheat yield by enhancing the sucrose synthesis efficiency of leaves.
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Affiliation(s)
- Ning Wang
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing, 100048, China
| | - Caihong Xing
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing, 100048, China
| | - Ge Qu
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing, 100048, China
| | - Jiahui Zhuo
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing, 100048, China
| | - Xinyu Wang
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing, 100048, China
| | - Yaxuan Li
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing, 100048, China
| | - Yueming Yan
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing, 100048, China
| | - Xiaohui Li
- Key Laboratory of Genetics and Biotechnology, College of Life Science, Capital Normal University, Beijing, 100048, China.
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24
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Jiang Y, Li X, Liu B, Tong F, Qu G, Sun Z. Engineering the hydrogen transfer pathway of an alcohol dehydrogenase to increase activity by rational enzyme design. Molecular Catalysis 2022. [DOI: 10.1016/j.mcat.2022.112603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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25
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Sang X, Tong F, Zeng Z, Wu M, Yuan B, Sun Z, Sheng X, Qu G, Alcalde M, Hollmann F, Zhang W. A Biocatalytic Platform for the Synthesis of Enantiopure Propargylic Alcohols and Amines. Org Lett 2022; 24:4252-4257. [PMID: 35670732 PMCID: PMC9208015 DOI: 10.1021/acs.orglett.2c01547] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
![]()
Propargylic alcohols
and amines are versatile building blocks in
organic synthesis. We demonstrate a straightforward enzymatic cascade
to synthesize enantiomerically pure propargylic alcohols and amines
from readily available racemic starting materials. In the first step,
the peroxygenase from Agrocybe aegerita converted
the racemic propargylic alcohols into the corresponding ketones, which
then were converted into the enantiomerically pure alcohols using
the (R)-selective alcohol dehydrogenase from Lactobacillus kefir or the (S)-selective
alcohol dehydrogenase from Thermoanaerobacter brokii. Moreover, an enzymatic Mitsunobu-type conversion of the racemic
alcohols into enantiomerically enriched propargylic amines using (R)-selective amine transaminase from Aspergillus
terreus or (S)-selective amine transaminase
from Chromobacterium violaceum was established. The
one-pot two-step cascade reaction yielded a broad range of enantioenriched
alcohol and amine products in 70–99% yield.
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Affiliation(s)
- Xianke Sang
- School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, 88 Xianning Avenue, Xianning, Hubei 437100, China.,Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West Seventh Avenue, Tianjin 300308, China
| | - Feifei Tong
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West Seventh Avenue, Tianjin 300308, China
| | - Zhigang Zeng
- School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, 88 Xianning Avenue, Xianning, Hubei 437100, China
| | - Minghu Wu
- School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, 88 Xianning Avenue, Xianning, Hubei 437100, China
| | - Bo Yuan
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West Seventh Avenue, Tianjin 300308, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West Seventh Avenue, Tianjin 300308, China
| | - Xiang Sheng
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West Seventh Avenue, Tianjin 300308, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West Seventh Avenue, Tianjin 300308, China
| | - Miguel Alcalde
- Department of Biocatalysis, Institute of Catalysis, CSIC, 28049 Madrid, Spain
| | - Frank Hollmann
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629HZ Delft, The Netherlands
| | - Wuyuan Zhang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West Seventh Avenue, Tianjin 300308, China
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26
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Zhang J, Liao D, Chen R, Zhu F, Ma Y, Gao L, Qu G, Cui C, Sun Z, Lei X, Gao SS. Tuning an Imine Reductase for the Asymmetric Synthesis of Azacycloalkylamines by Concise Structure-Guided Engineering. Angew Chem Int Ed Engl 2022; 61:e202201908. [PMID: 35322515 DOI: 10.1002/anie.202201908] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Indexed: 12/27/2022]
Abstract
Although imine reductases (IREDs) are emerging as attractive reductive aminases (RedAms), their substrate scope is still narrow, and rational engineering is rare. Focusing on hydrogen bond reorganization and cavity expansion, a concise strategy combining rational cavity design, combinatorial active-site saturation test (CAST), and thermostability engineering was designed, that transformed the weakly active IR-G36 into a variant M5 with superior performance for the synthesis of (R)-3-benzylamino-1-Boc-piperidine, with a 4193-fold improvement in catalytic efficiency, a 16.2 °C improvement in Tm , and a significant increase in the e.e. value from 78 % (R) to >99 % (R). M5 exhibits broad substrate scope for the synthesis of diverse azacycloalkylamines, and the reaction was demonstrated on a hectogram-scale under industrially relevant conditions. Our study provides a compelling example of the preparation of versatile and efficient IREDs, with exciting opportunities in medicinal and process chemistry as well as synthetic biology.
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Affiliation(s)
- Jun Zhang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China.,Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Daohong Liao
- Jiangsu JITRI Molecular Engineering Inst. Co., Ltd., Jiangsu, 215500, China
| | | | - Fangfang Zhu
- College of Biotechnology, Tianjin University of Science & Techno, Tianjin, 300457, China
| | - Yaqing Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Lei Gao
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology, College of Chemistry and Molecular Engineering, Synthetic and Functional Biomolecules Center, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100091, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Chengsen Cui
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Xiaoguang Lei
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology, College of Chemistry and Molecular Engineering, Synthetic and Functional Biomolecules Center, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100091, China
| | - Shu-Shan Gao
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China.,Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
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27
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Wang J, Qu G, Xie L, Gao C, Jiang Y, Zhang YHPJ, Sun Z, You C. Engineering of a thermophilic dihydroxy-acid dehydratase toward glycerate dehydration for in vitro biosystems. Appl Microbiol Biotechnol 2022; 106:3625-3637. [PMID: 35546366 DOI: 10.1007/s00253-022-11936-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 04/04/2022] [Accepted: 04/21/2022] [Indexed: 12/01/2022]
Abstract
Dihydroxy-acid dehydratase (DHAD) plays an important role in the utilization of glycerol or glucose for the production of value-added chemicals in the in vitro synthetic enzymatic biosystem. The low activity of DHAD in the dehydration of glycerate to pyruvate hampers its applications in biosystems. Protein engineering of a thermophilic DHAD from Sulfolobus solfataricus (SsDHAD) was performed to increase its dehydration activity. A triple mutant (I161M/Y145S/G205K) with a 10-fold higher activity on glycerate dehydration was obtained after three rounds of iterative saturation mutagenesis (ISM) based on computational analysis. The shrunken substrate-binding pocket and newly formed hydrogen bonds were the reason for the activity improvement of the mutant. For the in vitro synthetic enzymatic biosystems of converting glucose or glycerol to L-lactate, the biosystems with the mutant SsDHAD showed 3.32- and 2.34-fold higher reaction rates than the wild type, respectively. This study demonstrates the potential of protein engineering to improve the efficiency of in vitro synthetic enzymatic biosystems by enhancing the enzyme activity of rate-limited enzymes. KEY POINTS: • A screening method was established for the protein engineering of SsDHAD. • A R3 mutant of SsDHAD with 10-fold higher activity was obtained. • The R3 mutant exhibits higher productivity in the in vitro biosystems.
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Affiliation(s)
- Juan Wang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China.,National Technology Innovation Center of Synthetic Biology, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China.,National Technology Innovation Center of Synthetic Biology, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China
| | - Leipeng Xie
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China.,National Technology Innovation Center of Synthetic Biology, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China
| | - Chao Gao
- State Key Laboratory of Microbial Technology, Shandong University, 27 Shandanan Road, Jinan, 250100, China
| | - Yingying Jiang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China.,National Technology Innovation Center of Synthetic Biology, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China
| | - Yi-Heng P Job Zhang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China.,National Technology Innovation Center of Synthetic Biology, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China. .,National Technology Innovation Center of Synthetic Biology, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China.
| | - Chun You
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China. .,National Technology Innovation Center of Synthetic Biology, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308, China.
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28
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Bi Y, Jiang Y, Qin Z, Qu G, Sun Z. [Substitutability of metal-binding sites in an alcohol dehydrogenase]. Sheng Wu Gong Cheng Xue Bao 2022; 38:1518-1526. [PMID: 35470623 DOI: 10.13345/j.cjb.210601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Covalently anchoring of a ligand/metal via polar amino acid side chain(s) is often observed in metalloenzyme, while the substitutability of metal-binding sites remains elusive. In this study, we utilized a zinc-dependent alcohol dehydrogenase from Thermoanaerobacter brockii (TbSADH) as a model enzyme, analyzed the sequence conservation of the three residues Cys37, His59, and Asp150 that bind the zinc ion, and constructed the mutant library. After experimental validation, three out of 224 clones, which showed comparative conversion and ee values as the wild-type enzyme in the asymmetric reduction of the model substrate tetrahydrofuran-3-one, were screened out. The results reveal that the metal-binding sites in TbSADH are substitutable without tradeoff in activity and stereoselectivity, which lay a foundation for designing ADH-catalyzed new reactions via metal ion replacement.
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Affiliation(s)
- Yuexin Bi
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Yingying Jiang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zongmin Qin
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
- National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
- National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China
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Zhang J, Liao D, Chen R, Zhu F, Ma Y, Gao L, Qu G, Cui C, Sun Z, Lei X, Gao S. Tuning an Imine Reductase for the Asymmetric Synthesis of Azacycloalkylamines by Concise Structure‐Guided Engineering. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202201908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jun Zhang
- State Key Laboratory of Microbial Resources, Institute of Microbiology Chinese Academy of Sciences Beijing 100101 China
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
| | - Daohong Liao
- Jiangsu JITRI Molecular Engineering Inst. Co., Ltd. Jiangsu 215500 China
| | | | - Fangfang Zhu
- College of Biotechnology Tianjin University of Science & Techno Tianjin 300457 China
| | - Yaqing Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology Chinese Academy of Sciences Beijing 100101 China
| | - Lei Gao
- Beijing National Laboratory for Molecular Sciences Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology College of Chemistry and Molecular Engineering Synthetic and Functional Biomolecules Center Peking-Tsinghua Center for Life Sciences Peking University Beijing 100091 China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
| | - Chengsen Cui
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
| | - Xiaoguang Lei
- Beijing National Laboratory for Molecular Sciences Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology College of Chemistry and Molecular Engineering Synthetic and Functional Biomolecules Center Peking-Tsinghua Center for Life Sciences Peking University Beijing 100091 China
| | - Shu‐Shan Gao
- State Key Laboratory of Microbial Resources, Institute of Microbiology Chinese Academy of Sciences Beijing 100101 China
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
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30
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Song S, Jiang Y, Chen R, Su W, Liang W, Yang D, Li J, Zhang W, Gao S, Yuan B, Qu G, Sun Z. Whole-cell Biotransformation of Penicillin G by a Three-enzyme Co-expression System with Engineered Deacetoxycephalosporin C Synthase. Chembiochem 2022; 23:e202200179. [PMID: 35384232 DOI: 10.1002/cbic.202200179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 04/06/2022] [Indexed: 11/10/2022]
Abstract
Deacetoxycephalosporin C synthase (DAOCS) catalyzes the tranformation of penicillin G to phenylacetyl-7-aminodeacetoxycephalosporanic acid (G-7-ADCA) in dependence on 2-oxoglutarate (2OG). However, the low activity of DAOCS and the expense of 2OG restricted the practical application in the production of G-7-ADCA. Herein, a rational design campaign was performed on a DAOCS from Streptomyces clavuligerus (scDAOCS) in the quest to construct novel expandases. The resulting mutants showed 25~58% increase in activity compared to the template. The dominant DAOCS variants were then embeded into a three-enzyme co-expression system, consisting of a catalase and a L-glutamic oxidase for the generation of 2OG, to convert penicillin G into G-7-ADCA in E. coli . The engineered whole-cell enzyme cascade was applied on an up scaled reaction, exhibiting a yield of G-7-ADCA up to 39.21 mM (14.6 g·L -1 ) with a conversion of 78.42 mol%. This work highlights the potential of the integrated whole-cell system that may inspire further research on green and efficient production of 7-ADCA.
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Affiliation(s)
- Shiyi Song
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, TIB, CHINA
| | - Yingying Jiang
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, TIB, CHINA
| | - Ruidong Chen
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, TIB, CHINA
| | - Wencheng Su
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, TIB, 32 West 7th Avenue, Tianjin Airport Economic Area, 300308, Tianjin, CHINA
| | - Weinan Liang
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, TIB, CHINA
| | - Dameng Yang
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, TIB, 32 West 7th Avenue, Tianjin Airport Economic Area, 300308, CHINA
| | - Jincheng Li
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, TIB, CHINA
| | - Wuyuan Zhang
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, TIB, CHINA
| | - Shushan Gao
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, TIB, CHINA
| | - Bo Yuan
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, TIB, CHINA
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, TIB, CHINA
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, National Enyzme Engineering Lab, 32 West 7th Avenue, Tianjin Airport Economic Area, 300308, Tianjin, CHINA
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31
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Ogbemudia B, Qu G, Henson C, Esfandiary L, Przkora R, Victor S. Tramadol Use in Perioperative Care and Current Controversies. Curr Pain Headache Rep 2022; 26:241-246. [PMID: 35179725 DOI: 10.1007/s11916-022-01021-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/03/2022] [Indexed: 12/31/2022]
Abstract
PURPOSE OF REVIEW The aim of this review is to discuss the use of tramadol in the perioperative period. There is no doubt that tramadol has revolutionized pain treatment, making it important to understand the pharmacokinetics and pharmacodynamics in order to provide patients with the safest and most effective analgesia. RECENT FINDINGS Tramadol is a centrally acting synthetic analgesic with a multimode of action used to help treat moderate to severe pain. Pharmacologically, the unique opioid acts as a serotonin-norepinephrine reuptake inhibitor, while its metabolite, O-desmethyltramadol, acts on the μ-opioid receptor. The analgesic strength of tramadol is about one-tenth that of morphine, making it a relatively safe analgesic. Potential side effects of tramadol include nausea, vomiting, constipation, pruritus, and respiratory depression; however, the severity of these symptoms is minimal compared to traditional opioids. Although some of the perioperative uses of tramadol may be rare, it is a pain management option to consider when alternatives have proved ineffective.
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Affiliation(s)
- Blessing Ogbemudia
- Department of Anesthesiology, University of Florida College of Medicine, Gainesville, FL, 32610, USA
| | - Ge Qu
- Department of Anesthesiology, University of Florida College of Medicine, Gainesville, FL, 32610, USA
| | - Chris Henson
- Department of Anesthesiology, University of Florida College of Medicine, Gainesville, FL, 32610, USA
| | - Lida Esfandiary
- Department of Anesthesiology, University of Florida College of Medicine, Gainesville, FL, 32610, USA
| | - Rene Przkora
- Department of Anesthesiology, University of Florida College of Medicine, Gainesville, FL, 32610, USA
| | - Sandra Victor
- Department of Anesthesiology, University of Florida College of Medicine, Gainesville, FL, 32610, USA.
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32
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Dong C, Qu G, Guo J, Wei F, Gao S, Sun Z, Jin L, Sun X, Rochaix JD, Miao Y, Wang R. Rational design of geranylgeranyl diphosphate synthase enhances carotenoid production and improves photosynthetic efficiency in Nicotiana tabacum. Sci Bull (Beijing) 2022; 67:315-327. [PMID: 36546080 DOI: 10.1016/j.scib.2021.07.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 06/01/2021] [Accepted: 06/24/2021] [Indexed: 01/06/2023]
Abstract
Restricted genetic diversity can supply only a limited number of elite genes for modern plant cultivation and transgenesis. In this study, we demonstrate that rational design enables the engineering of geranylgeranyl diphosphate synthase (NtGGPPS), an enzyme of the methylerythritol phosphate pathway (MEP) in the model plant Nicotiana tabacum. As the crucial bottleneck in carotenoid biosynthesis, NtGGPPS1 interacts with phytoene synthase (NtPSY1) to channel GGPP into the production of carotenoids. Loss of this enzyme in the ntggpps1 mutant leads to decreased carotenoid accumulation. With the aim of enhancing NtGGPPS1 activity, we undertook structure-guided rational redesign of its substrate binding pocket in combination with sequence alignment. The activity of the designed NtGGPPS1 (a pentuple mutant of five sites V154A/I161L/F218Y/I209S/V233E, d-NtGGPPS1) was measured by a high-throughput colorimetric assay. d-NtGGPPS1 exhibited significantly higher conversion of IPP and each co-substrate (DMAPP ~1995.5-fold, GPP ~25.9-fold, and FPP ~16.7-fold) for GGPP synthesis compared with wild-type NtGGPPS1. Importantly, the transient and stable expression of d-NtGGPPS1 in the ntggpps1 mutant increased carotenoid levels in leaves, improved photosynthetic efficiency, and increased biomass relative to NtGGPPS1. These findings provide a firm basis for the engineering of GGPPS and will facilitate the development of quality and yield traits. Our results open the door for the structure-guided rational design of elite genes in higher plants.
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Affiliation(s)
- Chen Dong
- Zhengzhou Tobacco Research Institute, Zhengzhou 450001, China; Key Laboratory of Plant Stress Biology, State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, Kaifeng 475001, China; College of Biological Engineering, Henan University of Technology, Zhengzhou 450001, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Jinggong Guo
- Key Laboratory of Plant Stress Biology, State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, Kaifeng 475001, China
| | - Fang Wei
- School of Agricultural Sciences, Zhengzhou University, Zhengzhou 450001, China
| | - Shuwen Gao
- Key Laboratory of Plant Stress Biology, State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, Kaifeng 475001, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Lifeng Jin
- Zhengzhou Tobacco Research Institute, Zhengzhou 450001, China
| | - Xuwu Sun
- Key Laboratory of Plant Stress Biology, State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, Kaifeng 475001, China
| | - Jean-David Rochaix
- Departments of Molecular Biology and Plant Biology, University of Geneva, Geneva 1211, Switzerland
| | - Yuchen Miao
- Key Laboratory of Plant Stress Biology, State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, Kaifeng 475001, China.
| | - Ran Wang
- Zhengzhou Tobacco Research Institute, Zhengzhou 450001, China; School of Agricultural Sciences, Zhengzhou University, Zhengzhou 450001, China.
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33
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Tong F, Qin Z, Wang H, Jiang Y, Li J, Ming H, Qu G, Xiao Y, Sun Z. Biosynthesis of Chiral Amino Alcohols via an Engineered Amine Dehydrogenase in E. coli. Front Bioeng Biotechnol 2022; 9:778584. [PMID: 35071200 PMCID: PMC8766677 DOI: 10.3389/fbioe.2021.778584] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 11/15/2021] [Indexed: 11/22/2022] Open
Abstract
Chiral amino alcohols are prevalent synthons in pharmaceuticals and synthetic bioactive compounds. The efficient synthesis of chiral amino alcohols using ammonia as the sole amino donor under mild conditions is highly desired and challenging in organic chemistry and biotechnology. Our previous work explored a panel of engineered amine dehydrogenases (AmDHs) derived from amino acid dehydrogenase (AADH), enabling the one-step synthesis of chiral amino alcohols via the asymmetric reductive amination of α-hydroxy ketones. Although the AmDH-directed asymmetric reduction is in a high stereoselective manner, the activity is yet fully excavated. Herein, an engineered AmDH derived from a leucine dehydrogenase from Sporosarcina psychrophila (SpAmDH) was recruited as the starting enzyme, and the combinatorial active-site saturation test/iterative saturation mutagenesis (CAST/ISM) strategy was applied to improve the activity. After three rounds of mutagenesis in an iterative fashion, the best variant wh84 was obtained and proved to be effective in the asymmetric reductive amination of 1-hydroxy-2-butanone with 4-fold improvements in kcat/Km and total turnover number (TTN) values compared to those of the starting enzyme, while maintaining high enantioselectivity (ee >99%) and thermostability (T5015 >53°C). In preparative-scale reaction, the conversion of 100 and 200 mM 1-hydroxy-2-butanone catalyzed by wh84 was up to 91–99%. Insights into the source of an enhanced activity were gained by the computational analysis. Our work expands the catalytic repertoire and toolbox of AmDHs.
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Affiliation(s)
- Feifei Tong
- School of Life Sciences, Anhui University, Hefei, China.,Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China
| | - Zongmin Qin
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China
| | - Hongyue Wang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China
| | - Yingying Jiang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China
| | - Junkuan Li
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China.,Department of Chemistry, School of Science, Tianjin University, Tianjin, China
| | - Hui Ming
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China.,Department of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China.,National Technology Innovation Center of Synthetic Biology, Tianjin, China
| | - Yazhong Xiao
- School of Life Sciences, Anhui University, Hefei, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China.,National Technology Innovation Center of Synthetic Biology, Tianjin, China
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Yang F, Zhang Y, Meng X, Zhang T, Qu G, Wang K, Zhao W, Huang X, Zhong B, Xia L, Wang H. A new precursor to diversify BCN architectures with enhanced electromagnetic wave absorption. Nanotechnology 2022; 33:155601. [PMID: 34488196 DOI: 10.1088/1361-6528/ac23f2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 09/06/2021] [Indexed: 06/13/2023]
Abstract
Hexagonal BCN (h-BCN) is considered to be a promising dielectric ceramic material with a hybrid B-C-N structure and an electromagnetic wave (EMW) absorbing material with tenable properties. H-BCN bulk and microtube architectures are simultaneously synthesized by precursor pyrolysis method using BCl3, aniline (AN) and diethylenetriamine (DETA) as the raw material. By analyzing its electromagnetic parameters, the effective absorption bandwidth of the sample cracking at 900 °C with the proportion of raw materials (DETA:AN = 1:1) can be up to 7.2 GHz, and the minimum reflection loss can reach -43.6 dB at 7.92 GHz with a thickness of 3.5 mm. Moreover, the EMW absorbing property of the ceramic can be tuned by adjusting the ratio of monomers, pyrolysis temperature, and cooling rates.
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Affiliation(s)
- Fanfan Yang
- School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, People's Republic of China
| | - Yu Zhang
- School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, People's Republic of China
| | - Xiaohuan Meng
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, People's Republic of China
| | - Tao Zhang
- School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, People's Republic of China
| | - Ge Qu
- School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, People's Republic of China
| | - Kun Wang
- School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, People's Republic of China
| | - Wei Zhao
- School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, People's Republic of China
| | - Xiaoxiao Huang
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, People's Republic of China
| | - Bo Zhong
- School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, People's Republic of China
| | - Long Xia
- School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, People's Republic of China
| | - Huatao Wang
- School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, People's Republic of China
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35
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Qu G, Bi Y, Liu B, Li J, Han X, Liu W, Jiang Y, Qin Z, Sun Z. Unlocking the Stereoselectivity and Substrate Acceptance of Enzymes: Proline‐Induced Loop Engineering Test. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202110793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Ge Qu
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
- National Technology Innovation Center of Synthetic Biology Tianjin 300308 China
| | - Yuexin Bi
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
- University of Science and Technology of China Hefei 230027 China
| | - Beibei Liu
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
| | - Junkuan Li
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
- Department of Chemistry School of Science Tianjin University Tianjin 300072 China
| | - Xu Han
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
- National Technology Innovation Center of Synthetic Biology Tianjin 300308 China
| | - Weidong Liu
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
- National Technology Innovation Center of Synthetic Biology Tianjin 300308 China
| | - Yingying Jiang
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Zongmin Qin
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China
- National Technology Innovation Center of Synthetic Biology Tianjin 300308 China
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36
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Qu G, Sun Z. In Silico Prediction Methods for Site-Saturation Mutagenesis. Methods Mol Biol 2022; 2397:49-69. [PMID: 34813059 DOI: 10.1007/978-1-0716-1826-4_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Directed enzyme evolution has proven to be a powerful means to endow biocatalysts with novel catalytic repertoires. Apart from completely random gene mutagenesis, site-directed or site-saturation mutagenesis requires a semi-rational selection of the amino acid positions or the substituted residues, which can dramatically reduce the screening efforts in protein engineering. To this end, in silico prediction methods play a pivotal role in targeting site-saturation mutagenesis. In this chapter, we provide two distinct computational methods, (a) conformational dynamics-guided design and (b) protein-ligand interaction fingerprinting analysis, to identify specific positions for site-saturation mutagenesis toward manipulating substrate specificity/stereoselectivity of an alcohol dehydrogenase, and improving activity of a carboxylic acid reductase, respectively.
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Affiliation(s)
- Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China
- National Technology Innovation Center of Synthetic Biology, Tianjin, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China.
- National Technology Innovation Center of Synthetic Biology, Tianjin, China.
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37
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Jiang Y, Qu G, Sheng X, Tong F, Sun Z. Unraveling the mechanism of enantio-controlling switches of an alcohol dehydrogenase toward sterically small ketone. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00031h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient synthesis of chiral compounds under mild conditions is highly desirable in the chemical and pharmaceutical communities, but it often faces difficulties. Although various enzymes have been harnessed as biocatalysts...
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38
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Ming H, Yuan B, Qu G, Sun Z. Engineering the activity of amine dehydrogenase in the asymmetric reductive amination of hydroxyl ketones. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00391k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An engineered AmDH derived from a leucine dehydrogenase was used as the starting enzyme to improve its activity in the synthesis of (R)-3-amino-1-butanol. Preparative-scale synthesis of the (R)-product (90% yield, >99%) was performed on a gram-scale.
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Affiliation(s)
- Hui Ming
- Department of Life Sciences and Medicine, University of Science and technology of China, Hefei 230022, China
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, China
| | - Bo Yuan
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, China
- National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, China
- National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, China
- National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China
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39
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Wu R, Yu YY, Wang Y, Wang YZ, Song H, Ma C, Qu G, You C, Sun Z, Zhang W, Li A, Li CM, Yong YC, Zhu Z. Wastewater-powered high-value chemical synthesis in a hybrid bioelectrochemical system. iScience 2021; 24:103401. [PMID: 34841233 PMCID: PMC8605441 DOI: 10.1016/j.isci.2021.103401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 09/22/2021] [Accepted: 11/02/2021] [Indexed: 11/25/2022] Open
Abstract
A microbial electrochemical system could potentially be applied as a biosynthesis platform by extracting wastewater energy while converting it to value-added chemicals. However, the unfavorable thermodynamics and sluggish kinetics of in vivo whole-cell cathodic catalysis largely limit product diversity and value. Herein, we convert the in vivo cathodic reaction to in vitro enzymatic catalysis and develop a microbe-enzyme hybrid bioelectrochemical system (BES), where microbes release the electricity from wastewater (anode) to power enzymatic catalysis (cathode). Three representative examples for the synthesis of pharmaceutically relevant compounds, including halofunctionalized oleic acid based on a cascade reaction, (4-chlorophenyl)-(pyridin-2-yl)-methanol based on electrochemical cofactor regeneration, and l-3,4-dihydroxyphenylalanine based on electrochemical reduction, were demonstrated. According to the techno-economic analysis, this system could deliver high system profit, opening an avenue to a potentially viable wastewater-to-profit process while shedding scientific light on hybrid BES mechanisms toward a sustainable reuse of wastewater.
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Affiliation(s)
- Ranran Wu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, P.R. China
| | - Yang-Yang Yu
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, P.R. China
| | - Yuanming Wang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, P.R. China
- University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing, 100049, P.R. China
| | - Yan-Zhai Wang
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, P.R. China
| | - Haiyan Song
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, P.R. China
| | - Chunling Ma
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, P.R. China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, P.R. China
| | - Chun You
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, P.R. China
- University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing, 100049, P.R. China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, P.R. China
- University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing, 100049, P.R. China
| | - Wuyuan Zhang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, P.R. China
- University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing, 100049, P.R. China
| | - Aitao Li
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, 430062, P. R. China
| | - Chang Ming Li
- Institute for Materials Science and Devices, School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, P.R. China
- Institute of Advanced Cross-Field Science, College of Life Sciences, Qingdao University, Qingdao 266071, P.R. China
| | - Yang-Chun Yong
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, P.R. China
| | - Zhiguang Zhu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin 300308, P.R. China
- University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing, 100049, P.R. China
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Bi H, Qu G, Wang S, Zhuang Y, Sun Z, Liu T, Ma Y. Biosynthesis of a rosavin natural product in Escherichia coli by glycosyltransferase rational design and artificial pathway construction. Metab Eng 2021; 69:15-25. [PMID: 34715353 DOI: 10.1016/j.ymben.2021.10.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 09/23/2021] [Accepted: 10/20/2021] [Indexed: 12/30/2022]
Abstract
Phytochemicals are rich resources for pharmaceutical and nutraceutical agents. A key challenge of accessing these precious compounds can present significant bottlenecks for development. The cinnamyl alcohol disaccharides also known as rosavins are the major bioactive ingredients of the notable medicinal plant Rhodiola rosea L. Cinnamyl-(6'-O-β-xylopyranosyl)-O-β-glucopyranoside (rosavin E) is a natural rosavin analogue with the arabinopyranose unit being replaced by its diastereomer xylose, which was only isolated in minute quantity from R. rosea. Herein, we described the de novo production of rosavin E in Escherichia coli. The 1,6-glucosyltransferase CaUGT3 was engineered into a xylosyltransferase converting cinnamyl alcohol monoglucoside (rosin) into rosavin E by replacing the residue T145 with valine. The enzyme activity was further elevated 2.9 times by adding the mutation N375Q. The synthesis of rosavin E from glucose was achieved with a titer of 92.9 mg/L by combining the variant CaUGT3T145V/N375Q, the UDP-xylose synthase from Sinorhizobium meliloti 1021 (SmUXS) and enzymes for rosin biosynthesis into a phenylalanine overproducing E. coli strain. The production of rosavin E was further elevated by co-overexpressing UDP-xylose synthase from Arabidopsis thaliana (AtUXS3) and SmUXS, and the titer in a 5 L bioreactor with fed-batch fermentation reached 782.0 mg/L. This work represents an excellent example of producing a natural product with a disaccharide chain by glycosyltransferase engineering and artificial pathway construction.
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Affiliation(s)
- Huiping Bi
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China; Key Laboratory of Systems Microbial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China; Key Laboratory of Systems Microbial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Shuai Wang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China; Key Laboratory of Systems Microbial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Yibin Zhuang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China; Key Laboratory of Systems Microbial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China; Key Laboratory of Systems Microbial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.
| | - Tao Liu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China; Key Laboratory of Systems Microbial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.
| | - Yanhe Ma
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China; Key Laboratory of Systems Microbial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
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41
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Qu G, Bi Y, Liu B, Li J, Han X, Liu W, Jiang Y, Qin Z, Sun Z. Unlocking the Stereoselectivity and Substrate Acceptance of Enzymes: Proline-Induced Loop Engineering Test. Angew Chem Int Ed Engl 2021; 61:e202110793. [PMID: 34658118 DOI: 10.1002/anie.202110793] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 09/25/2021] [Indexed: 12/12/2022]
Abstract
Protein stability and evolvability influence each other. Although protein dynamics play essential roles in various catalytically important properties, their high flexibility and diversity makes it difficult to incorporate such properties into rational engineering. Therefore, how to unlock the potential evolvability in a user-friendly rational design process remains a challenge. In this endeavor, we describe a method for engineering an enantioselective alcohol dehydrogenase. It enables synthetically important substrate acceptance for 4-chlorophenyl pyridine-2-yl ketone, and perfect stereocontrol of both (S)- and (R)-configured products. Thermodynamic analysis unveiled the subtle interaction between enzyme stability and evolvability, while computational studies provided insights into the origin of selectivity and substrate recognition. Preparative-scale synthesis of the (S)-product (73 % yield; >99 % ee) was performed on a gram-scale. This proof-of-principle study demonstrates that interfaced proline residues can be rationally engineered to unlock evolvability and thus provide access to new biocatalysts with highly improved catalytic performance.
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Affiliation(s)
- Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.,National Technology Innovation Center of Synthetic Biology, Tianjin, 300308, China
| | - Yuexin Bi
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.,University of Science and Technology of China, Hefei, 230027, China
| | - Beibei Liu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Junkuan Li
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.,Department of Chemistry, School of Science, Tianjin University, Tianjin, 300072, China
| | - Xu Han
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.,National Technology Innovation Center of Synthetic Biology, Tianjin, 300308, China
| | - Weidong Liu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.,National Technology Innovation Center of Synthetic Biology, Tianjin, 300308, China
| | - Yingying Jiang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zongmin Qin
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.,National Technology Innovation Center of Synthetic Biology, Tianjin, 300308, China
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42
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Wang J, Yi T, Dong Y, Ran R, Cao F, Li Y, Luo Z, Xu Y, Fu Y, Kuang L, Chen G, Qu G, Yin Y, Li J, Xu X, Chen Y, Song Q, Chu Q. P40.06 A Real-World Study: Efficacy and Safety of Anlotinib for Advanced Non-Small Cell Lung Cancer. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.08.443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Chen Q, Guo M, Bi Y, Qu G, Sun Z, Wang Y, Luo G. Whole-cell biocatalytic synthesis of S-(4-chlorophenyl)-(pyridin-2-yl) methanol in a liquid-liquid biphasic microreaction system. Bioresour Technol 2021; 330:125022. [PMID: 33765631 DOI: 10.1016/j.biortech.2021.125022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/13/2021] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
This work aims to synthesize S-(4-chlorophenyl)-(pyridin-2-yl) methanol (S-CPMA) in a green, economic, and efficient way. In the water-cyclohexane liquid-liquid system, recombinant Escherichia coli (E. coli) was used as a whole-cell catalyst and retained > 60% of its catalytic activity after five reuse cycles. In situ accumulation of the substrate/product in the organic phase effectively improves substrate tolerance and reduces product inhibition and toxicity. Meanwhile, a microreaction system consisting of membrane dispersion and three-dimensional (3D) bending-microchannel was developed to successfully generate droplet swarms with an average diameter of 30 μm. Large specific surface area provided high mass transfer efficiency between phases. While the analogous reaction in a traditional stirred tank required > 270 min to achieve a yield of > 99%, in this biphasic microreaction system, the yield reached 99.6% with a high enantiomeric excess (ee) of > 99% in only 80 min. Efficient synthesis was achieved by reducing the time by 70%.
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Affiliation(s)
- Qiang Chen
- The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Mingzhao Guo
- The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Yuexin Bi
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Ge Qu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Yujun Wang
- The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
| | - Guangsheng Luo
- The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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Li J, Qu G, Shang N, Chen P, Men Y, Liu W, Mei Z, Sun Y, Sun Z. Near-perfect control of the regioselective glucosylation enabled by rational design of glycosyltransferases. Green Synthesis and Catalysis 2021. [DOI: 10.1016/j.gresc.2021.01.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Zhang F, Mohammadi E, Qu G, Dai X, Diao Y. Orientation-Dependent Host-Dopant Interactions for Manipulating Charge Transport in Conjugated Polymers. Adv Mater 2020; 32:e2002823. [PMID: 32812292 DOI: 10.1002/adma.202002823] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 06/28/2020] [Indexed: 06/11/2023]
Abstract
Molecular orientation plays a critical role in controlling carrier transport in organic semiconductors (OSCs). However, this aspect has not been explored for surface doping of OSC thin films. The challenge lies in lack of methods to precisely modulate relative molecular orientation between the dopant and the OSC host. Here, the impact of molecular orientation on dopant-host electronic interactions by large modulation of conjugated polymer orientation via solution coating is reported. Combining synchrotron-radiation X-ray measurements with spectroscopic and electrical characterizations, a quantitative correlation between doping-enhanced charge carrier mobility and the Herman's orientation parameter is presented. This direct correlation can be attributed to enhanced charge-transfer interactions at host/dopant interface with increasing face-on orientation of the polymer. These results demonstrate that the surface doping effect can be fundamentally manipulated by controlling the molecular orientation of the OSC layer, enabling optimization of carrier transport.
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Affiliation(s)
- Fengjiao Zhang
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Erfan Mohammadi
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 S Mathews Ave, Urbana, IL, 61801, USA
| | - Ge Qu
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 S Mathews Ave, Urbana, IL, 61801, USA
| | - Xiaojuan Dai
- Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Ying Diao
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 S Mathews Ave, Urbana, IL, 61801, USA
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Abstract
1. The heterologous expression and biological function of the Lactobacillus bacteriocin plantaricin K (PlnK) remain largely unknown. 2. In this study, PlnK was efficiently expressed in competent E. coli BL21 (used in transformation and protein expression) after 12 h, at 37°C and in 0.4 mmol/l isopropyl β- d-1-thiogalactopyranoside (IPTG). 3. The inhibitory bacterial spectrum of recombinant PlnK was investigated and indicated that levels of PlnK above 0.10 mg/ml produced an obvious inhibitory effect on gram-positive bacteria and gram-negative bacteria in vitro. 4. The effects of PlnK on intestinal immune function and the gut microbiome distribution in broilers were studied. The results revealed that, after consuming 2.50 × 10-3 mg/ml of PlnK in water for one week, at the phylum level, the abundance of Firmicutes was increased and the abundance of Bacleroidetes was decreased. At the family level, the abundance of Lachnospiraceae, Ruminococcaceae and Streptococcaceae were significantly improved, but the abundance of Bacteroidaceae was reduced. At the genus level, the abundances of Lachnoclostridium, Streptococcus and Ruminococcaceae-UCG-013, were significantly up-regulated, and the abundance of Bacteroides was down-regulated. 5. After oral liquid intake of PlnK for one week, levels of secretory immunoglobulin A (sIgA) in the duodenal mucus were not significantly increased, but the mRNA levels of TLR3, MDA5, IFN-α, IFN-β, IFITM3 and IFITM10 in the duodenum were significantly reduced. 6. This study demonstrated that the recombinant PlnK could adjust the intestinal microbiome distribution and downregulate the IFN pathway.
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Affiliation(s)
- L Xu
- College of Animal Science (College of Bee Science), Fujian Agriculture and Forestry University , Fuzhou, P.R. China
| | - J Zhou
- College of Animal Science (College of Bee Science), Fujian Agriculture and Forestry University , Fuzhou, P.R. China
| | - G Qu
- College of Animal Science (College of Bee Science), Fujian Agriculture and Forestry University , Fuzhou, P.R. China
| | - Z Lin
- College of Animal Science (College of Bee Science), Fujian Agriculture and Forestry University , Fuzhou, P.R. China
| | - Q Fan
- College of Animal Science (College of Bee Science), Fujian Agriculture and Forestry University , Fuzhou, P.R. China
| | - C Wang
- College of Animal Science (College of Bee Science), Fujian Agriculture and Forestry University , Fuzhou, P.R. China
| | - Q Wang
- College of Animal Science (College of Bee Science), Fujian Agriculture and Forestry University , Fuzhou, P.R. China.,Fujian Key Laboratory of Traditional Chinese Veterinary Medicine and Animal Health, Fujian Agriculture and Forestry University, Fuzhou , Fujian, P.R. China
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Qu G, Sun YY, Han BQ, Yu P, Liu JK, Yang SM. Preliminary study on lyrics intelligibility at different pitches in Chinese vocal music. Acta Otolaryngol 2020; 140:558-563. [PMID: 32552233 DOI: 10.1080/00016489.2019.1646926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Background: There is still no clear experimental data on the relationship between the intelligibility of Chinese vocal lyrics and different pitch.Aims/Objective: This study aims at investigating the intelligibility of Chinese sung words at different pitch.Material and methods: A word list is created and sung by eight singers at five different pitches (C5, F4, bB4, bE5, and bA5). The intelligibility of the words is tested by listeners with and without music background.Results: The average intelligibility score in the music-listeners is 84.9% (SD = 9.5%). The score at five pitches (from low to high) is 93%, 91.7%, 89.7%, 83.1%, and 67.1%, respectively. The average score is 77.4% (SD = 10.7%) in the non-music listeners. The average score is 87%, 86%, 79.8%, 76.8%, and 57.5% at five pitches, respectively. The ratio of unidentified sung words is 19.3% (SD, 4.3%) in female singers and 11.9% (SD = 1.5%) in male singers.Conclusions: The intelligibility of Chinese sung words declines gradually with increase in pitch, and the extent of decreases gradually elevating. Generally, the identified ratio of words sung by male singers is higher than that of female singers. The listeners who had no musical background have a lower intelligibility score than those with experience.
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Affiliation(s)
- Ge Qu
- Department of Otorhinolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Beijing, China
- Music College of Capital Normal University, Beijing City, China
| | - Yuan-yuan Sun
- Music College of Henan Polytechnic University, Jiaozuo City, China
| | | | - Ping Yu
- Department of Otorhinolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Beijing, China
| | | | - Shi-ming Yang
- Department of Otorhinolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Beijing, China
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Mei Z, Zhang K, Qu G, Li JK, Liu B, Ma JA, Tu R, Sun Z. High-Throughput Fluorescence Assay for Ketone Detection and Its Applications in Enzyme Mining and Protein Engineering. ACS Omega 2020; 5:13588-13594. [PMID: 32566823 PMCID: PMC7301380 DOI: 10.1021/acsomega.0c00245] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 05/21/2020] [Indexed: 06/11/2023]
Abstract
Ketones are of great importance as building blocks in synthetic organic chemistry and biocatalysis. Most ketones cannot easily be quantitatively assayed due to the lack of visible photometric properties. Effective high-throughput assay (HTA) development is therefore necessary for ketone determination. Inspired by previous works of an aldehyde assay based on 2-amino benzamidoxime derivatives, we developed a colorimetric method for rapid a HTA of structurally diverse ketones by using para-methoxy-2-amino benzamidoxime (PMA). This PMA-based method is characterized by high sensitivity manner (μM) with low background, as checked by gas chromatography (GC). It can be used for quantitatively monitoring ketones by fluorescence screening in microtiter plates. Furthermore, this HTA method was employed in mining alcohol dehydrogenases (ADHs), and in directed evolution aimed at enhancing ADH activity in the catalytic transformation of alcohols to ketones. This work provides a general tool for ketone detection in biocatalyst development.
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Affiliation(s)
- Zelong Mei
- College
of Biotechnology, Tianjin University of
Science and Technology, Tianjin 300457, China
- Tianjin
Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport
Economic Area, Tianjin 300308, China
| | - Kun Zhang
- Tianjin
Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport
Economic Area, Tianjin 300308, China
| | - Ge Qu
- Tianjin
Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport
Economic Area, Tianjin 300308, China
| | - Jun-Kuan Li
- Tianjin
Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport
Economic Area, Tianjin 300308, China
- Department
of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences,
and Tianjin Collaborative Innovation Center of Chemical Science and
Engineering, Tianjin University, Tianjin 300072, China
| | - Baoyan Liu
- Tianjin
Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport
Economic Area, Tianjin 300308, China
| | - Jun-An Ma
- Department
of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences,
and Tianjin Collaborative Innovation Center of Chemical Science and
Engineering, Tianjin University, Tianjin 300072, China
| | - Ran Tu
- Tianjin
Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport
Economic Area, Tianjin 300308, China
| | - Zhoutong Sun
- Tianjin
Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport
Economic Area, Tianjin 300308, China
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Meng X, Zhang T, Zhang J, Qu G, Wu L, Liu H, Zhao H, Zhong B, Xia L, Huang X, Wen G. Deformable BCN/Fe 3O 4/PCL composites through electromagnetic wave remote control. Nanotechnology 2020; 31:255710. [PMID: 32050191 DOI: 10.1088/1361-6528/ab758c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Electromagnetic wave (EMW) induction of shape memory polymer (SMP) composites with multifunctional inorganic fillers is a high efficiency, uniform, and non-contact method. Herein, the shape memory effect of ternary BCN/Fe3O4/PCL composites induced by EMWs are explored. The components of Fe3O4 and the BCN nanotubes serve as wave-absorbing materials. The electromagnetic properties and EMW absorption performance of BCN/Fe3O4/PCL are discussed in detail. The EMWs absorbed by BCN/Fe3O4/PCL are dissipated by dielectric loss and magnetic loss. The shape memory mechanism of BCN/Fe3O4/PCL is based on the Fe3O4 and BCN nanotubes dissipating absorbed EMW energy into heat to boost the temperature of the composites, thereby responding to EMW remote control. This work introduces a new direction for SMPs induced by EMWs as potential candidates in the application of shape recovery in a restricted space.
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Affiliation(s)
- Xiaohuan Meng
- School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), Weihai 264209, People's Republic of China
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Qu G, Li A, Acevedo‐Rocha CG, Sun Z, Reetz MT. Die zentrale Rolle der Methodenentwicklung in der gerichteten Evolution selektiver Enzyme. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201901491] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Ge Qu
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 West 7th Avenue, Tianjin Airport Economic Area Tianjin 300308 China
| | - Aitao Li
- State Key Laboratory of Biocatalysis and Enzyme Engineering Hubei Collaborative Innovation Center for Green Transformation of Bio-resources Hubei Key Laboratory of Industrial Biotechnology College of Life Sciences Hubei University 368 Youyi Road Wuchang Wuhan 430062 China
| | | | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 West 7th Avenue, Tianjin Airport Economic Area Tianjin 300308 China
| | - Manfred T. Reetz
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 West 7th Avenue, Tianjin Airport Economic Area Tianjin 300308 China
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim Deutschland
- Department of Chemistry, Hans-Meerwein-Straße 4 Philipps-Universität 35032 Marburg Deutschland
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