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Shen J, Liu G, Chen G, Zhang Y, Mei X, Zheng L, Xue C, Chang Y. Biochemical characterization and cleavage specificities analyses of three endo-1,3-fucanases within glycoside hydrolase family 174. Carbohydr Polym 2024; 335:122083. [PMID: 38616101 DOI: 10.1016/j.carbpol.2024.122083] [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: 01/14/2024] [Revised: 03/05/2024] [Accepted: 03/21/2024] [Indexed: 04/16/2024]
Abstract
Sulfated fucans have garnered extensive research interest in recent decades due to their varied bioactivity. Fucanases are important tools for investigating sulfated fucans. This study reported the bioinformatic analysis and biochemical properties of three GH174 family endo-1,3-fucanases. Wherein, Fun174Rm and Fun174Sb showed the highest optimal reaction temperature among the reported fucanases, and Fun174Sb possessed favorable thermostability and catalysis efficiency. Fun174Rm displayed a random endo-acting manner, while Fun174Ri and Fun174Sb hydrolyzed sulfated fucan in processive manners. UPLC-MS and NMR analyses confirmed that the three enzymes catalyze cleavage of the α(1 → 3)-bonds between Fucp2S and Fucp2S in the sulfated fucan from Isostichopus badionotus. These enzymes demonstrated novel cleavage specificities, which could accept α-Fucp2S residues at subsites -1 and + 1. The acquiring of these biotechnological tools would be beneficial to the in-depth research of sulfated fucans.
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Affiliation(s)
- Jingjing Shen
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Guanchen Liu
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Guangning Chen
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Yuying Zhang
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Xuanwei Mei
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Long Zheng
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Changhu Xue
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Yaoguang Chang
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China.
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Chang YF, Li JJ, Liu T, Wei CQ, Ma LW, Nikolenko VN, Chang WL. Morphological and biochemical characteristics associated with autophagy in gastrointestinal diseases. World J Gastroenterol 2024; 30:1524-1532. [PMID: 38617452 PMCID: PMC11008416 DOI: 10.3748/wjg.v30.i11.1524] [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] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 01/05/2024] [Accepted: 02/20/2024] [Indexed: 03/21/2024] Open
Abstract
Autophagy is a cellular catabolic process characterized by the formation of double-membrane autophagosomes. Transmission electron microscopy is the most rigorous method to clearly visualize autophagic engulfment and degradation. A large number of studies have shown that autophagy is closely related to the digestion, secretion, and regeneration of gastrointestinal (GI) cells. However, the role of autophagy in GI diseases remains controversial. This article focuses on the morphological and biochemical characteristics of autophagy in GI diseases, in order to provide new ideas for their diagnosis and treatment.
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Affiliation(s)
- Yi-Fan Chang
- Department of Gastrointestinal Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, China
| | - Jia-Jing Li
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, China
| | - Tao Liu
- Department of Gastrointestinal Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, China
| | - Chong-Qing Wei
- Department of Gastrointestinal Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, China
| | - Li-Wei Ma
- Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, China
| | - Vladimir N Nikolenko
- Department of Human Anatomy and Histology, I.M. Sechenov First Moscow State Medical University (Sechenov University), Moscow 119991, Russia
| | - Wei-Long Chang
- Department of Gastrointestinal Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, China
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Wang Y, Xie T, Yan G, Xue H, Zhao Z, Ye X. Heterologous Expression and Characterization of a Novel Mesophilic Maltogenic α-Amylase AmyFlA from Flavobacterium sp. NAU1659. Appl Biochem Biotechnol 2024:10.1007/s12010-024-04874-x. [PMID: 38386142 DOI: 10.1007/s12010-024-04874-x] [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] [Accepted: 02/12/2024] [Indexed: 02/23/2024]
Abstract
A novel amylase AmyFlA from Flavobacterium sp. NAU1659, AmyFlA, was cloned and expressed in Esherichia coli. Based on phylogenetic and functional analysis, it was identified as a novel member of the subfamily GH13_46, sharing high sequence identity. The protein was predicted to consist of 620 amino acids, with a putative signal peptide of 25 amino acids. The enzyme was able to hydrolyze soluble starch with a specific activity of 352.97 U/mg at 50 °C in 50 mM phosphate buffer (pH 6.0). The Km and Vmax values of AmyFlA were respectively 3.15 mg/ml and 566.36 µmol·ml-1·min-1 under optimal conditions. Its activity towards starch was enhanced by 63% in the presence of 1 mM Ca2+, indicating that AmyFlA was a Ca2+-dependent amylase. Compared to the reported maltogenic amylases, AmyFlA produced a lower variety of intermediate oligosaccharides at the start of the reaction so that the product mixture contained a higher proportion of maltose. These results indicate that AmyFlA may be potential application value in the production of high-maltose syrup.
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Affiliation(s)
- Yanxin Wang
- College of Life Sciences of Liaocheng University, Liaocheng, 252000, People's Republic of China
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Tingting Xie
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Guanhua Yan
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Huairen Xue
- College of Life Sciences of Liaocheng University, Liaocheng, 252000, People's Republic of China
| | - Zhensong Zhao
- College of Life Sciences of Liaocheng University, Liaocheng, 252000, People's Republic of China
| | - Xianfeng Ye
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, Nanjing, 210095, People's Republic of China.
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Wei L, Xu Y, Du M, Fan Y, Zou R, Xu X, Zhang Q, Zhang YZ, Wang W, Li F. Data on cloning, expression and biochemical characteristics of a chondroitin sulfate/dermatan sulfate 4- O-endosulfatase. Data Brief 2023; 48:109139. [PMID: 37113498 PMCID: PMC10126848 DOI: 10.1016/j.dib.2023.109139] [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: 02/24/2023] [Revised: 03/15/2023] [Accepted: 04/03/2023] [Indexed: 04/29/2023] Open
Abstract
The data shown in this article are related to the published paper entitled "A novel 4-O-endosulfatase with high potential for the structure-function studies of chondroitin sulfate/dermatan sulfate" in Carbohydrate Polymers. In this article, the phylogenetic analysis, cloning, expression, purification, specificity and biochemical characteristics of the identified chondroitin sulfate/dermatan sulfate 4-O-endosulfatase (endoBI4SF) are described in detail. The recombinant endoBI4SF with a molecular mass of 59.13 kDa can can specifically hydrolyze the 4-O- but not 2-O- and 6-O-sulfate groups in the oligo-/polysaccharides of chondroitin sulfate/dermatan sulfate and show the maximum reaction rate in 50 mM Tris-HCl buffer (pH 7.0) at 50°C, which can be a very useful tool for the structural and functional studies of chondroitin sulfate/dermatan sulfate.
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Affiliation(s)
- Lin Wei
- National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology and State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Rd, Qingdao 266237, China
| | - Yingying Xu
- National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology and State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Rd, Qingdao 266237, China
| | - Min Du
- National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology and State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Rd, Qingdao 266237, China
| | - Ying Fan
- Qingdao Special Servicemen Recuperation Center of PLA Navy, Qingdao 266071, China
| | - Ruyi Zou
- National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology and State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Rd, Qingdao 266237, China
| | - Xiangyu Xu
- National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology and State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Rd, Qingdao 266237, China
| | - Qingdong Zhang
- School of Life Science and Technology, Weifang Medical University, 7166 Baotong West Street, Weifang 261053, China
| | - Yu-Zhong Zhang
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Wenshuang Wang
- National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology and State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Rd, Qingdao 266237, China
- Corresponding authors.
| | - Fuchuan Li
- National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology and State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Rd, Qingdao 266237, China
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
- Corresponding authors.
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Zhang Q, Gui Y, Zhao L, Zhang A, Fu L, Cao Z, Li J. Identification and Characterization of an ι-Carrageenase from Macroalgae-associated Bacterium Microbulbifer sp. YNDZ01. J Sci Food Agric 2023. [PMID: 37209381 DOI: 10.1002/jsfa.12705] [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: 11/03/2022] [Revised: 03/31/2023] [Accepted: 04/30/2023] [Indexed: 05/22/2023]
Abstract
BACKGROUND In this study, an ι-carrageenase gene, Car1293 was obtained from the genome of Microbulbifer sp. YNDZ01, which was isolated from the surface of macroalgae, Indonesia. Up to now, there are few studies on ι-carrageenase and the anti-inflammatory activity of ι-carrageenan oligosaccharides (CGOS). To enhance our perspective on ι-carrageenase and ι-carrageen oligosaccharides, the genes sequence, protein structure, enzymatic properties, enzymatic digestion products and its anti-inflammatory activity were investigated. RESULTS The gene length of Car1293 is 2,589 bp, encoding an enzyme with 862 amino acids, which shares 34% similarity with any previously reported ι-carrageenase. Spatial structure of Car1293 is consisted of many α-helices with a β-fold binding module located at its terminu, and eight binding sites were found in the binding module based on the result of docking with CGOS-DP4 ligand. The optimum temperature and pH for the activity of recombinant Car1293 toward ι-carrageenan were 50°C and 6.0, respectively. The hydrolysates of Car1293 are mainly degree of polymerization (DP) 8 with minor products having DP2, DP4 and DP6. The enzymatic hydrolysates CGOS-DP8 showed prominent anti-inflammatory activity that was greater than that of the positive control L-monomethylarginine in lipopolysaccharide-induced RAW264.7 macrophages; it inhibited NO production, and significantly inhibited tumor necrosis factor-α and interleukin-6 secretion. CONCLUSION The ι-carrageenase sequence encoded by Car1293 is novel and can hydrolyze carrageenan into CGOS-DP8 that has a significant anti-inflammatory effect. This study fills a gap in the research on the biological activity of oligosaccharides in ι-carrageenan and provides promising data for the development of natural anti-inflammatory agent. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Qian Zhang
- Key Lab of Ecological Environment Science and Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
| | - Yuanyuan Gui
- Key Lab of Ecological Environment Science and Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
| | - Luying Zhao
- Key Lab of Ecological Environment Science and Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
| | - Ao Zhang
- College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao, Shandong, 266042, China
| | - Liping Fu
- Key Lab of Ecological Environment Science and Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
| | - Zhe Cao
- Key Lab of Ecological Environment Science and Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
| | - Jiang Li
- Key Lab of Ecological Environment Science and Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
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Zhang Y, Dong Y, Wang P, Zhu P, Li Y, Lai Y, Liu J, Liu Q. Cauliflower-shaped Pleurotus ostreatus cultivated in an atmosphere with high environmental carbon dioxide concentration. Mycologia 2023; 115:1-11. [PMID: 36651878 DOI: 10.1080/00275514.2022.2149013] [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: 12/21/2021] [Accepted: 11/12/2022] [Indexed: 01/19/2023]
Abstract
Commercial aspects, physiological properties, and nutritional characteristics of Pleurotus ostreatus grown under various environmental carbon dioxide concentration ([CO2]e) conditions were assessed. As [CO2]e increased, the activity of antioxidant enzymes (catalase, peroxidase, and superoxide dismutase) in fruiting body increased, activities of succinate dehydrogenase and cytochrome c oxidase were inhibited, and malondialdehyde and adenosine triphosphate (ATP) syntheses were reduced, leading to incomplete development of pilei and stipes, or even absence of pilei. Under high [CO2]e (≥1.00%), fruiting body of P. ostreatus was morphologically altered to assume cauliflower shape. This cultivation condition resulted in high total contents of crude protein, crude fiber, and amino acids, increased levels of umami- and sweet-tasting amino acids, and reduced levels of bitter-tasting amino acids, thus enhancing the flavor of the product. In conclusion, a novel "cauliflower-shaped" mushroom (P. ostreatus) was successfully cultivated at high (≥1.00%) environmental CO2 concentration. The product has a delicious taste and high nutritional value, is relatively easy to transport and store, and has excellent potential for commercial development.
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Affiliation(s)
- Yongjie Zhang
- Department of Vegetables, College of Horticulture, China Agricultural University, Haidian District, 100193, Beijing, China
| | - Yongqiang Dong
- Department of Vegetables, College of Horticulture, China Agricultural University, Haidian District, 100193, Beijing, China
| | - Peng Wang
- Department of Vegetables, College of Horticulture, China Agricultural University, Haidian District, 100193, Beijing, China
| | - Peilin Zhu
- Department of Vegetables, College of Horticulture, China Agricultural University, Haidian District, 100193, Beijing, China
| | - Yuanhui Li
- Department of Vegetables, College of Horticulture, China Agricultural University, Haidian District, 100193, Beijing, China
| | - Yu Lai
- Department of Vegetables, College of Horticulture, China Agricultural University, Haidian District, 100193, Beijing, China
| | - Jia Liu
- Department of Vegetables, College of Horticulture, China Agricultural University, Haidian District, 100193, Beijing, China
| | - Qinghong Liu
- Department of Vegetables, College of Horticulture, China Agricultural University, Haidian District, 100193, Beijing, China
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Deng X, Li J, Hou S, Ci B, Liu B, Xu K. Prevalence and impact of Sjögren's syndrome in primary biliary cholangitis: a systematic review and meta-analysis. Ann Hepatol 2022; 27:100746. [PMID: 35970319 DOI: 10.1016/j.aohep.2022.100746] [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] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 07/13/2022] [Accepted: 07/17/2022] [Indexed: 02/04/2023]
Abstract
INTRODUCTION AND OBJECTIVES We performed a systematic review and meta-analysis to evaluate the prevalence of concomitant Sjögren's syndrome (SS) with primary biliary cholangitis (PBC) in adults and quantify the impact of SS on PBC. METHODS PubMed, Web of Science and Cochrane library were searched using subject terms and predefined inclusion and exclusion criteria. RESULTS Seventeen articles were included. The prevalence of SS in PBC patients ranged from 3.5 to 73% (35% pooled) (95% CI: 28-41%; p < 0.01). Seven studies included various biochemical indicators, including alanine transaminase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), γ-glutamyltransferase (γ-GT), total bilirubin (TBiL), albumin (ALB) and platelet (PLT), and immunological indexes including IgG, IgM, antinuclear antibody (ANA), anti-mitochondrial antibody (AMA), AMA-M2 and anti-Ro/Sjögren's syndrome antigen A (SSA) antibodies. Meta-analysis showed that there were no significant differences in ALT, AST, ALP, γ-GT, TBiL and IgM levels between PBS and PBC with SS. Pooled analysis showed that ALB (MD=0.82; 95% CI: 0.08-1.56) and PLT (MD=30.41; 95% CI: 10.16-50.66) levels were lower, IgG levels (MD=-1.55; 95% CI: -2.39 to -0.72) were higher, and the positive ratios of ANA (RR=0.92; 95% CI: 0.87-0.98), AMA (RR=0.94; 95% CI: 0.89-0.98), AMA-M2 (RR=0.77; 95% CI: 0.70-0.85) and anti-Ro/SSA antibodies (RR=0.29; 95% CI: 0.08-1.01) were significantly higher in PBC patients with SS than in PBC patients. CONCLUSIONS Our study confirms that SS is common in PBC. Comorbid SS appears to influence the clinical phenotype of PBC and may therefore influence the management of PBC.
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Affiliation(s)
- Xiaoling Deng
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Jiahuan Li
- Department of Infectious Diseases, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Shuhui Hou
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Bai Ci
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Beibei Liu
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Keshu Xu
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
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Zhang L, Lin T, Yin Y, Chen M. Biochemical and functional characterization of a thermostable RecJ exonuclease from Thermococcus gammatolerans. Int J Biol Macromol 2022; 204:617-626. [PMID: 35150781 DOI: 10.1016/j.ijbiomac.2022.02.033] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 02/07/2022] [Accepted: 02/07/2022] [Indexed: 01/18/2023]
Abstract
RecJ is ubiquitous in bacteria and Archaea, and play an important role in DNA replication and repair. Currently, our understanding on biochemical function of archaeal RecJ is incomplete due to the limited reports. The genome of the hyperthermophilic and radioresistant euryarchaeon Thermococcus gammatolerans encodes one putative RecJ protein (Tga-RecJ). Herein, we report biochemical characteristics and catalytic mechanism of Tga-RecJ. Tga-RecJ can degrade ssDNA in the 5'-3' direction at high temperature as observed in Thermococcus kodakarensis RecJ and Pyrococcus furiosus RecJ, the two closest homologs of the enzyme. In contrasted to P. furiosus RecJ, Tga-RecJ lacks 3'-5' ssRNA exonuclease activity. Furthermore, maximum activity of Tga-RecJ is observed at 50 °C ~ 70 °C and pH 7.0-9.0 with Mn2+, and the enzyme is the most thermostable among the reported RecJ proteins. Additionally, the rates for hydrolyzing ssDNA by Tga-RecJ were estimated by kinetic analyses at 50 °C ~ 70 °C, thus revealing its activation energy (10.5 ± 0.6 kcal/mol), which is the first report on energy barrier for ssDNA degradation by RecJ. Mutational studies showed that the mutations of residues D36, D83, D105, H106, H107 and D166 in Tga-RecJ to alanine almost completely abolish its activity, thereby suggesting that these residues are essential for catalysis.
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Affiliation(s)
- Likui Zhang
- Guangling College, Yangzhou University, China; College of Environmental Science and Engineering, Marine Science & Technology Institute, Yangzhou University, China.
| | - Tan Lin
- College of Environmental Science and Engineering, Marine Science & Technology Institute, Yangzhou University, China
| | - Youcheng Yin
- College of Environmental Science and Engineering, Marine Science & Technology Institute, Yangzhou University, China
| | - Min Chen
- College of Environmental Science and Engineering, Marine Science & Technology Institute, Yangzhou University, China.
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Lin T, Zhang L, Jiang D, Wu L, Chen K, Li L, Jin C, Li Z, Oger P. Biochemical characterization and mutational analysis of a novel flap endonuclease 1 from Thermococcus barophilus Ch5. Int J Biochem Cell Biol 2022; 143:106154. [PMID: 34990837 DOI: 10.1016/j.biocel.2021.106154] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 12/20/2021] [Accepted: 12/30/2021] [Indexed: 11/21/2022]
Abstract
Flap endonuclease 1 (FEN1) plays important roles in DNA replication, repair and recombination. Herein, we report biochemical characteristics and catalytic mechanism of a novel FEN1 from the hyperthermophilic euryarchaeon Thermococcus barophilus Ch5 (Tb-FEN1). As expected, the recombinant Tb-FEN1 can cleave 5'-flap DNA. However, the enzyme has no activity on cleaving pseudo Y DNA, which sharply contrasts with other archaeal and eukaryotic FEN1 homologs. Tb-FEN1 retains 24% relative activity after heating at 100 °C for 20 min, demonstrating that it is the most thermostable among all reported FEN1 proteins. The enzyme displays maximal activity in a wide range of pH from 7.0 to 9.5. The Tb-FEN1 activity is dependent on a divalent metal ion, among which Mg2+ and Mn2+ are optimal. Enzyme activity is inhibited by NaCl. Kinetic analyzes estimated that an activation energy for removal of 5'-flap from DNA by Tb-FEN1 was 35.7 ± 4.3 kcal/mol, which is the first report on energy barrier for excising 5'-flap from DNA by a FEN1 enzyme. Mutational studies demonstrate that the K87A, R94A and E154A amino acid substitutions abolish cleavage activity and reduce 5'-flap DNA binding efficiencies, suggesting that residues K87, R94, and E154 in Tb-FEN1 are essential for catalysis and DNA binding as well. Overall, Tb-FEN1 is an extremely thermostable endonuclease with unusual features.
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Ma W, Lu Y, Zuo Y, Wang C, Liu J. Effects of removing a highly conserved disulfide bond in ubiquitin-associated domain of human HOIP on biochemical characteristics. Protein Expr Purif 2021; 190:106005. [PMID: 34695570 DOI: 10.1016/j.pep.2021.106005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 08/17/2021] [Revised: 10/21/2021] [Accepted: 10/21/2021] [Indexed: 11/30/2022]
Abstract
Disulfide bond formed between the cysteine pairs plays a key role in maintaining the integrity of the protein structure and function. The ubiquitin-associated (UBA) domain of human HOIP contains three cysteine residues, Cys504, Cys551, and Cys572. Disulfide bonds formed by Cys504 and Cys551 residues are highly conserved, but the effect of disulfide bonds on the biochemical characteristics of UBA has not been elucidated. In addition, due to the presence of isolated Cys572, inactive inclusion bodies may be formed during protein expression or trigger protein aggregation during protein purification. In this study, the co-expression of SUMO fusion protein combined with SUMO protease (ULP enzyme) in Escherichia coli was successfully applied to improve the soluble expression of UBA domain. Introduced three mutants (UBAC551A, UBAC572A and UBAC551,572A) determined the effects of disulfide bonds on the biochemical characteristics of UBA. Circular dichroism and analytical size exclusion chromatography results showed that the target proteins obtained by co-expression could be folded correctly and had biological activity. Both thermal-induced and urea-induced results demonstrated that the elimination of disulfide bonds would significantly reduce the stability of UBA. Fluorescence spectroscopy result showed that the elimination of disulfide bonds slightly increases the binding affinity of UBA to ligands. In summary, soluble, stable and active UBA domain and its mutants were prepared by co-expression system, which will further contribute to the structural and functional research of UBA.
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Affiliation(s)
- Wenlei Ma
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, China
| | - Ying Lu
- College of Life Sciences, Northeast Agricultural University, Harbin, 150030, China
| | - Yongmei Zuo
- Heilongjiang Institute of Animal Health Inspection, Harbin, 150006, China
| | - Chenchen Wang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, China
| | - Jiafu Liu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, China; Harbin Medical University-Daqing, No 39, Xin Yang Road, Daqing, Heilongjiang, 163319, China.
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Zhang L, Jiang D, Li Y, Wu L, Liu Q, Dong K, Oger P. Characterization of a novel type III alcohol dehydrogenase from Thermococcus barophilus Ch5. Int J Biol Macromol 2021; 171:491-501. [PMID: 33428959 DOI: 10.1016/j.ijbiomac.2020.12.197] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 12/25/2020] [Accepted: 12/26/2020] [Indexed: 12/27/2022]
Abstract
The genome of the hyperthermophilic and piezophilic euryarchaeaon Thermococcus barophilus Ch5 encodes three putative alcohol dehydrogenases (Tba ADHs). Herein, we characterized Tba ADH547 biochemically and probed its catalytic mechanism by mutational studies. Our data demonstrate that Tba ADH547 can oxidize ethanol and reduce acetaldehyde at high temperature with the same optimal temperature (75 °C) and exhibit similar thermostability for oxidization and reduction reactions. However, Tba ADH547 has different optimal pH for oxidation and reduction: 8.5 for oxidation and 7.0 for reduction. Tba ADH547 is dependent on a divalent ion for its oxidation activity, among which Mn2+ is optimal. However, Tba ADH547 displays about 20% reduction activity without a divalent ion, and the maximal activity with Fe2+. Furthermore, Tba ADH547 showcases a strong substrate preference for 1-butanol and 1-hexanol over ethanol and other alcohols. Similarly, Tba ADH547 prefers butylaldehyde to acetaldehyde as its reduction substrate. Mutational studies showed that the mutations of residues D195, H199, H262 and H274 to Ala result in the significant activity loss of Tba ADH547, suggesting that residues D195, H199, H262 and H274 are responsible for catalysis. Overall, Tba ADH547 is a thermoactive ADH with novel biochemical characteristics, thereby allowing this enzyme to be a potential biocatalyst.
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Affiliation(s)
- Likui Zhang
- Guangling College, Yangzhou University, China; College of Environmental Science and Engineering, Marine Science & Technology Institute, Yangzhou University, China.
| | - Donghao Jiang
- College of Environmental Science and Engineering, Marine Science & Technology Institute, Yangzhou University, China
| | - Yuting Li
- College of Environmental Science and Engineering, Marine Science & Technology Institute, Yangzhou University, China
| | - Leilei Wu
- College of Environmental Science and Engineering, Marine Science & Technology Institute, Yangzhou University, China
| | - Qing Liu
- College of Environmental Science and Engineering, Marine Science & Technology Institute, Yangzhou University, China
| | - Kunming Dong
- College of Environmental Science and Engineering, Marine Science & Technology Institute, Yangzhou University, China
| | - Philippe Oger
- Univ Lyon, INSA de Lyon, CNRS UMR 5240, Villeurbanne, France.
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12
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Hu F, Cao S, Li Q, Zhu B, Yao Z. Construction and biochemical characterization of a novel hybrid alginate lyase with high activity by module recombination to prepare alginate oligosaccharides. Int J Biol Macromol 2020; 166:1272-1279. [PMID: 33159942 DOI: 10.1016/j.ijbiomac.2020.11.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 11/02/2020] [Accepted: 11/02/2020] [Indexed: 01/01/2023]
Abstract
Alginate lyases are essential tools to prepare alginate oligosaccharides with various biological activities. However, alginate lyases with excellent properties such as high activity and good thermal stability are still in shortage. Therefore, it is crucial to exploit new alginate lyases with high activity and polysaccharide-degrading efficiency for alginate oligosaccharide preparation. Herein, we proposed to construct a novel hybrid alginate lyase with improved property by module recombination. The hybrid alginate lyase, designated as Aly7C, was successfully constructed by recombining the carbohydrate binding module (CBM) of Aly7A with the catalytic module of Aly7B. Interestingly, the hybrid enzyme Aly7C exhibited higher activity than the catalytic domain. Moreover, it could degrade sodium alginate, polyM and polyG into oligosaccharides with degrees of polymerization (Dps) 2-5, which exhibit perfect product specificity. This work provides a new insight into well-defined generation of alginate oligosaccharides with associated CBMs and enhances the understanding of functions of the modules.
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Affiliation(s)
- Fu Hu
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
| | - Shengsheng Cao
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
| | - Qian Li
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
| | - Benwei Zhu
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China.
| | - Zhong Yao
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
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13
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Li J, McLaughlin RW, Chen M, Liu YL, Xie HX, Wan XL, Zhou JY, Zheng JS. First case of Shewanella indica isolated from a Bryde's whale (Balaenoptera edeni) stranded in the northern Beibu Gulf, China. Antonie Van Leeuwenhoek 2020; 113:1385-1391. [PMID: 32656718 DOI: 10.1007/s10482-020-01444-z] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Accepted: 06/25/2020] [Indexed: 11/26/2022]
Abstract
The purpose of this study was to culture and characterise bacteria from an intact abscess on the skin of a dead Bryde's whale (Balaenoptera edeni) which stranded in the northern Beibu Gulf, China. To grow bacteria, samples from the abscess were added to blood agar. After incubation, yellowish mucous colonies were visualized. The bacterium was firstly recognised as Shewanella algae by the VITEK® 2 System. However, by using 16S rRNA gene sequencing the bacterium was finally identified as S. indica. To characterise the bacterium, antibiotic susceptibility and virulence factors, such as hemolysis and biofilm formation were investigated. The bacterium is capable of β-hemolysis and biofilm formation and it is also sensitive to several different classes of antibiotics, such as β-lactams, quinolones, and aminoglycosides. To date there have been no reports of this bacterium causing infections in humans or animals. However, in this study we described the first case of S. indica isolated from an intact abscess on the back of a Bryde's whale.
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Affiliation(s)
- Jia Li
- The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
- University of Chinese Academy of Sciences, Beijing, 100039, China
| | | | - Mo Chen
- Guangxi Key Laboratory of Marine Environmental Science, Guanxi Beibu Gulf Marine Research Center, Guanxi Academy of Sciences, Nanning, 530007, China
| | - Ying Li Liu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Hia Xia Xie
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Xiao Ling Wan
- The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
- University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Jun Ying Zhou
- Zhong Nan Hospital of Wuhan University, Wuhan, 430072, China.
| | - Jin Song Zheng
- The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
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14
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Liu HJ, Wang X, Yang ZL, Ren LL, Qian TT. Identification and biochemical characterization of the glutathione reductase family from Populus trichocarpa. Plant Sci 2020; 294:110459. [PMID: 32234218 DOI: 10.1016/j.plantsci.2020.110459] [Citation(s) in RCA: 8] [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: 01/02/2020] [Revised: 02/14/2020] [Accepted: 02/24/2020] [Indexed: 05/05/2023]
Abstract
Glutathione reductase (GR; EC 1.6.4.2) is a key NADPH-dependent flavo-protein oxidoreductase which can catalyze the oxidized glutathione (GSSG) to reduced glutathione (GSH) to protect plant cells from oxidative damage induced by Reactive oxygen species (ROS) burst. To investigate the biochemical characteristics and functional divergence of Populus GR family, three GR genes (PtGR1.1/1.2/2) were cloned from Populus trichocarpa and their biochemical characteristics were analyzed in this study. All the three genes were expressed in root, stem, leaf and bud, and the expression of PtGR genes were general upregulated under salicylic acid and alamethicin treatment. PtGR1.1 and PtGR1.2 were localized in cytoplasm, while PtGR2 was in chloroplast. The three PtGR proteins showed different enzymatic activities, apparent kinetic characteristic and thermal stability profiles. However, they have similar bivalent metal ions (Cu2+, Cd2+, Zn2+ and Pb2+) sensitivity and optimum pH profiles. Our study sheds light on a comprehensive information of glutathione reductase family in P. trichocarpa, and proved PtGR genes play critical roles when suffering different stresses.
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Affiliation(s)
- Hai-Jing Liu
- Key Laboratory of Herbage and Endemic Crop Biotechnology, School of Life Sciences, Inner Mongolia University, Hohhot 010070, China; State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Xin Wang
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Ling Yang
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lin-Ling Ren
- College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming 650201, China
| | - Ting-Ting Qian
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Wang Q, Liu W, Li X, Wang R, Zhai J. Carbamazepine toxicity and its co-metabolic removal by the cyanobacteria Spirulina platensis. Sci Total Environ 2020; 706:135686. [PMID: 31784167 DOI: 10.1016/j.scitotenv.2019.135686] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 07/30/2019] [Revised: 11/04/2019] [Accepted: 11/20/2019] [Indexed: 06/10/2023]
Abstract
Bioremediation of pharmaceutical-contaminated wastewater using microalgae has attracted increasing attention. Cyanobacteria, which are important prokaryotic microalgae, are widely distributed in different water environments, and have the advantages of simple culture and a fast growth rate. However, studies on either the toxicity of pharmaceutical contaminants (PhCs) to cyanobacteria or the removal of PhCs by cyanobacteria are scarce. In this study, carbamazepine (CBZ) and Spirulina platensis were selected as model PhCs and cyanobacteria, respectively. CBZ (>1 mg/L) had toxicity effects on S. platensis, showing maximal growth inhibition (34.0%) at 100 mg/L after 10 days of cultivation. At CBZ < 25 mg/L, S. platensis showed a trend similar to that of eukaryotic microalgae in increasing superoxide dismutase and catalase activities and content of chlorophylls, carotenoids, carbohydrates, and lipids. These results indicated that S. platensis had a similar protective mechanism to CBZ toxicity as that of the eukaryotic microalgae. Increasing CBZ concentration (50-100 mg/L) significantly decreased these biochemical characteristics and photosynthetic activity owing to the serious damage of the structure and function of S. platensis. However, with increasing cultivation time, the growth and photosynthetic activity of S. platensis recovered from the toxicity of CBZ. S. platensis showed a maximum of 30.97 ± 1.30% removal of CBZ (1 mg/L), mainly through biodegradation. Addition of 0.3 mg/L glucose enhanced this removal efficiency to 50.13 ± 2.51% via co-metabolism. These findings indicated that S. platensis can be used for the removal of CBZ or other PhCs from wastewater.
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Affiliation(s)
- Quanfeng Wang
- College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China
| | - Wenbo Liu
- College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China.
| | - Xiaoting Li
- College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China
| | - Rong Wang
- College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China
| | - Jun Zhai
- College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China.
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16
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Zhang X, Adachi S, Ura K, Takagi Y. Properties of collagen extracted from Amur sturgeon Acipenser schrenckii and assessment of collagen fibrils in vitro. Int J Biol Macromol 2019; 137:809-820. [PMID: 31279889 DOI: 10.1016/j.ijbiomac.2019.07.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [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: 05/15/2019] [Revised: 07/03/2019] [Accepted: 07/03/2019] [Indexed: 11/28/2022]
Abstract
The objective of this study was to assess the nature of the collagens from the Amur sturgeon to determine its possibility as a potential collagen source for biomedical applications. From a sturgeon (1.22 kg), 6.0 g (dry wt) of skin collagen (SC), 4.1 g of swim bladder collagen (SBC), and 0.4 g of notochord collagen (NC) were obtained. SC and SBC were characterized as type I, and NC as type II collagen. Denaturation temperatures of SC, SBC, and NC were calculated as 28.5, 30.5, and 33.5 °C, respectively. Gene expression of the type I procollagen α2 chain of Amur sturgeon (ascol1a2) was specifically higher than ascol1a1 expression in the swim bladder, suggesting a unique composition of α chains in this organ. SC and SBC had better abilities of fibril formation with unique higher-order structures compared with porcine type I collagen. The maximum transition temperature (Tm) of reassembled fibrils formed in a buffer solution containing NaCl at 0 and 140 mM was 34.4 °C and 38.9 °C in SC, and 40.1 °C and 40.7 °C in SBC, respectively. These characteristic features suggested that sturgeon collagens could be used in the biomedical industries in future applications.
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Affiliation(s)
- Xi Zhang
- College of Fisheries, Hubei Provincial Engineering Laboratory for Pond Aquaculture, Huazhong Agricultural University, Wuhan 430070, China; Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido 041-8611, Japan.
| | - Shinji Adachi
- Faculty of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido 041-8611, Japan
| | - Kazuhiro Ura
- Faculty of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido 041-8611, Japan
| | - Yasuaki Takagi
- Faculty of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido 041-8611, Japan
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Qu XP, Li JS, Wang JX, Wu LY, Wang YF, Chen CJ, Zhou MG, Hou YP. Effects of the dinitroaniline fungicide fluazinam on Fusarium fujikuroi and rice. Pestic Biochem Physiol 2018; 152:98-105. [PMID: 30497718 DOI: 10.1016/j.pestbp.2018.09.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 06/02/2018] [Revised: 09/11/2018] [Accepted: 09/18/2018] [Indexed: 06/09/2023]
Abstract
Fusarium fujikuroi is the primary causal agent of rice bakanae disease. Fluazinam is a protective dinitroaniline fungicide which could interrupt the fungal cell's energy production. Little is known about the effects of fluazinam on F. fujikuroi. In this study, baseline sensitivity of F. fujikuroi to fluazinam was determined using 103 isolates collected from diseased young rice of different fields in Shaoxing of Zhejiang Province and Huaian of Jiangsu Province of China in 2016. The EC50 values of fluazinam on inhibiting mycelial growth against 103 isolates of F. fujikuroi ranged from 0.0621 to 0.5446 μg/mL with the average value of 0.2038 ± 0.0099 μg/mL (mean ± standard error). The EC50 values of fluazinam on suppressing conidium germination against 103 isolates of F. fujikuroi ranged from 0.1006 to 0.9763 μg/mL with the mean value of 0.3552 ± 0.0181 μg/mL. Treated with fluazinam, hyphae of F. fujikuroi were contorted, offshoot of top mycelia increased, conidial production descreased significantly and exopolysaccharide (EPS) content did not change significantly while peroxidase (POD) activity significantly decreased. Meanwhile, cell membrane permeability increased after treated with fluazinam. The analysis of cell ultrastructure indicated that fluazinam could damage the membrane structure of F. fujikuroi and cause a large number of vacuoles formed. In addition, fluazinam did not affect germination rate, plant height and fresh weight of rice, which indicated that fluazinam was safe to rice. All the results indicated that fluazinam had strong antifungal activity against F. fujikuroi and a potential application in controlling rice bakanae disease. These results will provide useful information for management of rice bakanae disease caused by F. fujikuroi and further increase our understanding about the mode of action of fluazinam against F. fujikuroi and other phytopathogens.
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Affiliation(s)
- Xiang-Pu Qu
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Jiao-Sheng Li
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Jian-Xin Wang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Luo-Yu Wu
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Ying-Fan Wang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Chang-Jun Chen
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Ming-Guo Zhou
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Yi-Ping Hou
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China.
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18
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Ma L, Li F, Zhang X, Feng X. Biochemical characterization of a recombinant Lactobacillus acidophilus strain expressing exogenous FomA protein. Arch Oral Biol 2018; 92:25-31. [PMID: 29747062 DOI: 10.1016/j.archoralbio.2018.04.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 12/30/2017] [Revised: 04/27/2018] [Accepted: 04/29/2018] [Indexed: 11/17/2022]
Abstract
In previous research, to combine the immunogenicity of Fusobacterium nucleatum (F. nucleatum) and the probiotic properties of Lactobacillus acidophilus (L. acidophilus), we constructed a FomA-expressing L. acidophilus strain and assessed its immunogenicity. Our findings indicated that oral administration of the recombinant L. acidophilus strain reduced the risk of periodontal infection by Porphyromonas gingivalis (P. gingivalis) and F. nucleatum. However, because the exogenous FomA is an heterologous protein for the original bacterium, in this study, we assessed whether the biochemical characteristics of the recombinant L. acidophilus strain change due to the expression of the exogenous FomA protein. OBJECTIVES To test the biochemical characteristics of a recombinant L. acidophilus strain expressing exogenous FomA and assess its antibiotic sensitivity. DESIGNS We assessed the colony morphology, growth, acid production, and carbohydrate fermentation abilities of the recombinant L. acidophilus strain. In addition, we tested the adhesive ability and antimicrobial activity of the recombinant and assessed its antibiotic sensitivity through a drug susceptibility test. RESULTS The experimental results showed that the colony and microscopic morphology of the recombinant L. acidophilus strain was consistent with the original strain, and the recombinant strain grew well when cultured under aerobic or anaerobic conditions, exhibiting a growth rate that was identical to that of the standard strain. Similarly, the supernatants of the recombinant L. acidophilus can inhibit the growth of E. coli and P. gingivalis at different concentrations, and the recombinant strain displayed essentially the same drug sensitivity profile as the original L. acidophilus. However, to our surprise, the recombinant strains exhibited a greater adhesion ability than the reference strain. CONCLUSIONS Our study demonstrated that, in addition to an increased adhesion ability, the recombinant L. acidophilus strain maintained the basic characteristics of the standard strain ATCC 4356, including antibiotic sensitivity. Thus, the recombinant strains have great potential to be utilized as a safe and effective periodontitis vaccine in the future.
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Affiliation(s)
- Li Ma
- Department of Preventive and Pediatric Dentistry, Stomatological Hospital of Tianjin Medical University, China
| | - Fei Li
- Department of Preventive Dentistry, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, China
| | - Xiangyu Zhang
- Department of Preventive and Pediatric Dentistry, Stomatological Hospital of Tianjin Medical University, China
| | - Xiping Feng
- Department of Preventive Dentistry, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, China.
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Sun SJ, Deng CH, Zhang LY, Hu KH. Molecular analysis and biochemical characteristics of degenerated strains of Cordyceps militaris. Arch Microbiol 2017; 199:939-944. [PMID: 28321481 DOI: 10.1007/s00203-017-1359-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [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: 01/30/2017] [Revised: 03/02/2017] [Accepted: 03/07/2017] [Indexed: 11/26/2022]
Abstract
Cordyceps militaris has commercially been cultivated, but its degenerated subcultures have gradually resulted in the reduced production. In this study, the biological characteristics and DNA change of degenerated strains of C. militaris were analyzed in detail. The results showed that the degenerated strains exhibited the lower growth rate, and the deficiency in fruit body formation and pigment production. The degradation of strains was not attributable to DNA changes identified by RAPD and SRAP. Compared to normal strains, the biochemical indexes of degradation strains and normal strains showed that the carotenoid content of degradation strains was significantly lower, the activities of cellulase and amylase of degradation strains were slight lower, and the EPS content was lower, but the IPS was higher. All these results suggested that the degradation of C. militaris may be caused by the inhibition or in harmony of metabolite synthesis involved in the metabolic regulation, which should be further verified.
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Affiliation(s)
- Shu-Jing Sun
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, People's Republic of China
- Gutian Edible Fungi Research Institute, Fujian Agriculture and Forestry University, Gutian, 352200, People's Republic of China
| | - Chang-Huan Deng
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, People's Republic of China
| | - Liao-Yuan Zhang
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, People's Republic of China
| | - Kai-Hui Hu
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, People's Republic of China.
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20
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Zhang AM, Zhang CL, Song Y, Zhao P, Feng Y, Wang B, Li Z, Liu L, Xia X. Genetic variations of the NPC1L1 gene associated with hepatitis C virus (HCV) infection and biochemical characteristics of HCV patients in China. Int J Infect Dis 2016; 53:6-11. [PMID: 27769799 DOI: 10.1016/j.ijid.2016.10.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 08/16/2016] [Revised: 09/23/2016] [Accepted: 10/11/2016] [Indexed: 12/23/2022] Open
Abstract
OBJECTIVES About 2% of the world population is infected with hepatitis C virus (HCV), a leading cause of hepatic cirrhosis and hepatocellular carcinoma. The Niemann-Pick C1-like 1 cholesterol absorption receptor (NPC1L1) was recently identified to be an important factor for HCV entry into host cells. Whether genetic variations of the NPC1L1 gene are associated with HCV infection is unknown. METHODS In this study, five single nucleotide polymorphisms (SNPs) of the NPC1L1 gene were analyzed in 261 HCV-infected individuals and 265 general controls from Yunnan Province, China. RESULTS No significant differences were identified in genotypes or alleles of the SNPs between the two groups. After constructing haplotypes based on the five SNPs, a significant difference between HCV-infected individuals and general controls was shown for two haplotypes. Haplotype GCCTT appeared to be a protective factor and haplotype GCCCT was a risk factor for HCV-infected individuals. Genotypes of four SNPs correlated with biochemical characteristics of HCV-infected persons. Genotypes of SNPs rs799444 and rs2070607 were correlated with total bilirubin. Genotype TT of rs917098 was a risk factor for the gamma-glutamyltransferase level. Furthermore, HCV-infected individuals carrying genotype GG of rs41279633 showed statistically higher gamma-glutamyltransferase levels than HCV-infected persons with GT and TT. CONCLUSION The results of this study identified the association between genetic susceptibility of the NPC1L1 gene and HCV infection, as well as biochemical characteristics of HCV-infected persons in Yunnan, China.
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Affiliation(s)
- A-Mei Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Molecular Medicine Center of Yunnan Province, Yunnan, China.
| | - Cheng-Lin Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
| | - Yuzhu Song
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Molecular Medicine Center of Yunnan Province, Yunnan, China
| | - Ping Zhao
- Department of Microbiology, Shanghai Key Laboratory of Medical Biodefense, Second Military Medical University, Shanghai, China
| | - Yue Feng
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Molecular Medicine Center of Yunnan Province, Yunnan, China
| | - Binghui Wang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Molecular Medicine Center of Yunnan Province, Yunnan, China
| | - Zheng Li
- Department of Clinical Laboratory, The First People's Hospital of Yunnan Province, Yunnan, China
| | - Li Liu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Molecular Medicine Center of Yunnan Province, Yunnan, China
| | - Xueshan Xia
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Molecular Medicine Center of Yunnan Province, Yunnan, China.
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21
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Cheng Y, Jiang J, Dong Y, Zhou Z. Identification and characterization of proteins with phenoloxidase-like activities in the sea urchin Strongylocentrotus nudus. Fish Shellfish Immunol 2015; 47:117-121. [PMID: 26314521 DOI: 10.1016/j.fsi.2015.08.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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: 06/29/2015] [Revised: 08/13/2015] [Accepted: 08/20/2015] [Indexed: 06/04/2023]
Abstract
Three proteins with PO-like activities in the coelomocytes of sea urchin Strongylocentrotus nudus were identified using electrophoretic method and named as SnPO1, SnPO2 and SnPO3 according to their molecular mass from high to low. The SnPOs were characterized for substrate specificity and the effects of temperature, pH, divalent metal ions and inhibitors on PO activities. They showed oxidative activities to L-3,4-dihydroxyphenylalanine. (l-DOPA), dopamine and hydroquinone, but failed to oxidize tyrosine, which illustrated the three proteins had laccase-like PO activities. The optimum temperature for the activities of SnPO1, SnPO2 and SnPO3 was 75 °C, 70 °C, 40 °C, and the optimum pH was 7.0, 9.0, 8.0, respectively. The SnPOs were notably activated after being incubated in boiled water for 60 min, suggesting that the three proteins are thermophilic. The activity of SnPO1 was greatly enhanced by Cu(2+), Mn(2+) and Fe(2+) and inhibited by Pb(2+), Cd(2+), EDTA, DETC, sodium sulfite and ascorbic acid, but SnPO2 and SnPO3 were not obviously affected by Pb(2+) and Cd(2+), suggesting the three proteins are copper-containing, and the catalytic properties of SnPO1 might be different from those of SnPO2 and SnPO3. Taken together, SnPO1, SnPO2 and SnPO3 might play different roles in the immune and physiological processes of S. nudus.
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Affiliation(s)
- Yuhui Cheng
- Liaoning Key Lab of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
| | - Jingwei Jiang
- Liaoning Key Lab of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
| | - Ying Dong
- Liaoning Key Lab of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
| | - Zunchun Zhou
- Liaoning Key Lab of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China.
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Jiang J, Zhou Z, Dong Y, Guan X, Wang B, Jiang B, Yang A, Chen Z, Gao S, Sun H. Characterization of phenoloxidase from the sea cucumber Apostichopus japonicus. Immunobiology 2014; 219:450-6. [PMID: 24631331 DOI: 10.1016/j.imbio.2014.02.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2013] [Revised: 02/13/2014] [Accepted: 02/16/2014] [Indexed: 11/29/2022]
Abstract
Phenoloxidase (PO) is a crucial immune-related enzyme in invertebrates. In this study, three POs of the sea cucumber Apostichopus japonicus were detected in coelomic fluid using linear-gradient native-PAGE combined with catechol staining and then partially purified by gel excising. The results showed that the three POs had a color of mahogany (AjPO1), yellow (AjPO2) and purple (AjPO3) respectively with molecular weights smaller than 21kDa in native-PAGE after staining with catechol. Enzymatic activities analysis revealed that AjPO1, AjPO2 and AjPO3 had optimal temperature of 45, 95 and 85°C and pH of 5.0, 8.0 and 8.0, respectively. Kinetic analysis showed that the Km values of AjPO1 for catechol, l-DOPA, dopamine and hydroquinone were 3.23, 0.86, 3.98 and 1.20mmol/l, respectively, those of AjPO2 were 0.31, 0.38, 2.05 and 1.30mmol/l, respectively, and those of AjPO3 were 5.95, 1.28, 5.81 and 0.62mmol/l, respectively. These results suggest that the three POs are laccase-type phenoloxidase. The activities of all three A. japonicus POs were significantly promoted by Ca(2+), Mg(2+) and Mn(2+), and strongly inhibited by ethylenediamine tetraacetic acid disodium (EDTA), sodium diethyldithiocarbamate (DETC) and some common antioxidants. The inhibitions by EDTA and DETC suggest that the three A. japonicus POs are copper-containing metalloenzymes. Immune-responsive analysis showed that the total PO activities in coelomocytes (TPAC) increased greatly after lipopolysaccharide (LPS) challenge and declined significantly after polyinosinic-polycytidylic acid (PolyI:C) challenge, implying that A. japonicus PO immune system, which is composed of several isoenzymes with different characteristics, is closely involved in the defense against the infection of Gram-negative bacteria and double-stranded RNA viruses.
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Affiliation(s)
- Jingwei Jiang
- Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
| | - Zunchun Zhou
- Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China.
| | - Ying Dong
- Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
| | - Xiaoyan Guan
- Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
| | - Bai Wang
- Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
| | - Bei Jiang
- Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
| | - Aifu Yang
- Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
| | - Zhong Chen
- Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
| | - Shan Gao
- Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
| | - Hongjuan Sun
- Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, Liaoning 116023, PR China
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