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Zhu J, Liu M, Kang J, Wang S, Zha Z, Zhan Y, Wang Z, Li J, Cai D, Chen S. Engineering Bacillus licheniformis as industrial chassis for efficient bioproduction from starch. BIORESOURCE TECHNOLOGY 2024; 406:131061. [PMID: 38960005 DOI: 10.1016/j.biortech.2024.131061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 05/11/2024] [Accepted: 06/29/2024] [Indexed: 07/05/2024]
Abstract
Starch is an attractive feedstock in biorefinery processes, while the low natural conversion rate of most microorganisms limits its applications. Herein, starch metabolic pathway was systematically investigated using Bacillus licheniformis DW2 as the host organism. Initially, the effects of overexpressing amylolytic enzymes on starch hydrolysis were evaluated. Subsequently, the transmembrane transport system and intracellular degradation module were modified to accelerate the uptake of hydrolysates and their further conversion to glucose-6-phosphate. The DW2-derived strains exhibited robust growth in starch medium, and productivity of bacitracin and subtilisin were improved by 38.5% and 32.6%, with an 32.3% and 22.9% increase of starch conversion rate, respectively. Lastly, the employment of engineering strategies enabled another B. licheniformis WX-02 to produce poly-γ-glutamic acid from starch with a 2.1-fold increase of starch conversion rate. This study not only provided excellent B. licheniformis chassis for sustainable bioproduction from starch, but shed light on researches of substrate utilization.
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Affiliation(s)
- Jiang Zhu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, College of Life Sciences, Hubei University, Wuhan, 430062, PR China
| | - Min Liu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, College of Life Sciences, Hubei University, Wuhan, 430062, PR China
| | - Jianling Kang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, College of Life Sciences, Hubei University, Wuhan, 430062, PR China
| | - Shiyi Wang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, College of Life Sciences, Hubei University, Wuhan, 430062, PR China
| | - Ziyan Zha
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, College of Life Sciences, Hubei University, Wuhan, 430062, PR China
| | - Yangyang Zhan
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, College of Life Sciences, Hubei University, Wuhan, 430062, PR China
| | - Zhi Wang
- Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Provincial Key Laboratory of Industrial Microbiology, School of Life and Health Sciences, Hubei University of Technology, Wuhan 430068, Hubei, PR China
| | - Junhui Li
- Lifecome Biochemistry Co. Ltd, Nanping, 353400, PR China
| | - Dongbo Cai
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, College of Life Sciences, Hubei University, Wuhan, 430062, PR China
| | - Shouwen Chen
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, College of Life Sciences, Hubei University, Wuhan, 430062, PR China.
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2
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Ubi DS, Ekpenyong MG, Ikharia EJ, Akwagiobe EA, Asitok AD, Antai SP. Production, characterization, and bio-ethanologenic potential of a novel tripartite raw starch-digesting amylase from Priestia flexa UCCM 00132. Prep Biochem Biotechnol 2024; 54:597-611. [PMID: 37787010 DOI: 10.1080/10826068.2023.2259452] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
The biological conversion of agro-waste biomass into value-added metabolites is one of the trendy biotechnological research areas in recent times. One of the major drawbacks of the bioprocess is the saccharification potential of the amylolytic enzyme that releases reducing sugar from complex biomass to serve as substrate for fermentation. The present study reports the production of a novel tripartite raw starch-digesting amylase (RSDA) by an indigenous Priestia flexa strain with α-, β-, and gluco-amylolytic activities and its potential for bioethanol production. Response surface statistics was employed to develop a suitable medium for improved production of the tripartite enzyme by submerged fermentation. The bioprocess selected raw starch (4.36%) Ca2+(2.71 g/L) and Zn2+ (0.0177 g/L) as significant variables which demonstrated a total RSDA activity of 7208.23 U/mL in a 5-L batch bioreactor. SDS/Native-PAGE determined the molecular weights of the 27-fold purified product as 25.2 kDa, 57.3 kDa, and 90.1 kDa for α-, β-, and gluco-amylases, respectively. Optimum temperature and pH for enzyme activity were respectively broad at 30-70 °C and 4-11. The enzyme mixture demonstrated digestibility above 90% against a variety of raw starches and simultaneous fermentation of digestate with Saccharomyces cerevisiae generated 71.69 g/L of bioethanol within 24 h suggesting great potential for bioethanologenesis.
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Affiliation(s)
- David Sam Ubi
- Food and Industrial Microbiology Unit, Department of Microbiology, Faculty of Biological Sciences, University of Calabar, Calabar, Nigeria
| | - Maurice George Ekpenyong
- Environmental Microbiology and Biotechnology Unit, Department of Microbiology, Faculty of Biological Sciences, University of Calabar, Calabar, Nigeria
- University of Calabar Collection of Microorganisms (UCCM), University of Calabar, Calabar, Nigeria
| | - Eloghosa Joyce Ikharia
- Environmental Microbiology and Biotechnology Unit, Department of Microbiology, Faculty of Biological Sciences, University of Calabar, Calabar, Nigeria
| | - Ernest Ablewho Akwagiobe
- Food and Industrial Microbiology Unit, Department of Microbiology, Faculty of Biological Sciences, University of Calabar, Calabar, Nigeria
| | - Atim David Asitok
- Environmental Microbiology and Biotechnology Unit, Department of Microbiology, Faculty of Biological Sciences, University of Calabar, Calabar, Nigeria
- University of Calabar Collection of Microorganisms (UCCM), University of Calabar, Calabar, Nigeria
| | - Sylvester Peter Antai
- Environmental Microbiology and Biotechnology Unit, Department of Microbiology, Faculty of Biological Sciences, University of Calabar, Calabar, Nigeria
- University of Calabar Collection of Microorganisms (UCCM), University of Calabar, Calabar, Nigeria
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3
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Slavić MŠ, Kojić M, Margetić A, Stanisavljević N, Gardijan L, Božić N, Vujčić Z. Highly stable and versatile α-amylase from Anoxybacillus vranjensis ST4 suitable for various applications. Int J Biol Macromol 2023; 249:126055. [PMID: 37524287 DOI: 10.1016/j.ijbiomac.2023.126055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 07/26/2023] [Accepted: 07/27/2023] [Indexed: 08/02/2023]
Abstract
α-Amylase from the thermophilic bacterial strain Anoxybacillus vranjensis ST4 (AVA) was cloned into the pMALc5HisEk expression vector and successfully expressed and purified from the Escherichia coli ER2523 host strain. AVA belongs to the GH13_5 subfamily of glycoside hydrolases and has 7 conserved sequence regions (CSRs) distributed in three distinct domains (A, B, C). In addition, there is a starch binding domain (SBD) from the CBM20 family of carbohydrate binding modules (CBMs). AVA is a monomer of 66 kDa that achieves maximum activity at 60-80 °C and is active and stable over a wide pH range (4.0-9.0). AVA retained 50 % of its activity after 31 h of incubation at 60 °C and was resistant to a large number of denaturing agents. It hydrolyzed starch granules very efficiently, releasing maltose, maltotriose and maltopentaose as the main products. The hydrolysis rates of raw corn, wheat, horseradish, and potato starch, at a concentration of 10 %, were 87.8, 85.9, 93.0, and 58 %, respectively, at pH 8.5 over a 3 h period. This study showed that the high level of expression as well as the properties of this highly stable and versatile enzyme show all the prerequisites for successful application in industry.
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Affiliation(s)
- Marinela Šokarda Slavić
- University of Belgrade, Institute of Chemistry, Technology and Metallurgy, National Institute of the Republic of Serbia, Department of Chemistry, Belgrade, Republic of Serbia.
| | - Milan Kojić
- Institute of Virology, Vaccines and Sera "Torlak", Belgrade, Republic of Serbia; University of Belgrade, Institute of Molecular Genetics and Genetic Engineering (IMGGE), Belgrade, Republic of Serbia
| | - Aleksandra Margetić
- University of Belgrade, Institute of Chemistry, Technology and Metallurgy, National Institute of the Republic of Serbia, Department of Chemistry, Belgrade, Republic of Serbia
| | - Nemanja Stanisavljević
- University of Belgrade, Institute of Molecular Genetics and Genetic Engineering (IMGGE), Belgrade, Republic of Serbia
| | - Lazar Gardijan
- University of Belgrade, Institute of Molecular Genetics and Genetic Engineering (IMGGE), Belgrade, Republic of Serbia
| | - Nataša Božić
- University of Belgrade, Institute of Chemistry, Technology and Metallurgy, National Institute of the Republic of Serbia, Department of Chemistry, Belgrade, Republic of Serbia
| | - Zoran Vujčić
- University of Belgrade, Faculty of Chemistry, Department of Biochemistry, Belgrade, Republic of Serbia
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4
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Zhang L, Zhong L, Wang J, Zhao Y, Zhang Y, Zheng Y, Dong W, Ye X, Huang Y, Li Z, Cui Z. Efficient hydrolysis of raw starch by a maltohexaose-forming α-amylase from Corallococcus sp. EGB. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.112361] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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5
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Lomthong T, Saelee K, Trakarnpaiboon S, Siripornvisal S, Kitpreechavanich V. Potential of Recombinant Raw Starch‐Degrading Enzyme from
Escherichia coli
for Sugar Syrup and Bioethanol Productions Using Broken Rice Powder as Substrate. STARCH-STARKE 2021. [DOI: 10.1002/star.202100201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Thanasak Lomthong
- Division of Biology Faculty of Science and Technology Rajamangala University of Technology Thanyaburi Pathumthani 12110 Thailand
| | - Kittiphong Saelee
- Department of Microbiology Faculty of Science Kasetsart University Bangkok 10900 Thailand
| | - Srisakul Trakarnpaiboon
- Enzyme Technology Team Biorefnery and Bioproduct Technology Research Group National Center for Genetic Engineering and Biotechnology Pathum Thani Thailand
| | - Sirirat Siripornvisal
- Department of Microbiology Faculty of Science and Technology Phranakhon Si Ayutthaya Rajabhat University Ayutthaya Thailand
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6
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Božić N, Rozeboom HJ, Lončar N, Slavić MŠ, Janssen DB, Vujčić Z. Characterization of the starch surface binding site on Bacillus paralicheniformis α-amylase. Int J Biol Macromol 2020; 165:1529-1539. [PMID: 33058974 DOI: 10.1016/j.ijbiomac.2020.10.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 10/03/2020] [Accepted: 10/03/2020] [Indexed: 11/16/2022]
Abstract
α-Amylase from Bacillus paralicheniformis (BliAmy), belonging to GH13_5 subfamily of glycoside hydrolases, was proven to be a highly efficient raw starch digesting enzyme. The ability of some α-amylases to hydrolyze raw starch is related to the existence of surface binding sites (SBSs) for polysaccharides that can be distant from the active site. Crystallographic studies performed on BliAmy in the apo form and of enzyme bound with different oligosaccharides and oligosaccharide precursors revealed binding of these ligands to one SBS with two amino acids F257 and Y358 mainly involved in complex formation. The role of this SBS in starch binding and degradation was probed by designing enzyme variants mutated in this region (F257A and Y358A). Kinetic studies with different substrates show that starch binding through the SBS is disrupted in the mutants and that F257 and Y358 contributed cumulatively to binding and hydrolysis. Mutation of both sites (F257A/Y358A) resulted in a 5-fold lower efficacy with raw starch as substrate and at least 5.5-fold weaker binding compared to the wild type BliAmy, suggesting that the ability of BliAmy to hydrolyze raw starch with high efficiency is related to the level of its adsorption onto starch granules.
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Affiliation(s)
- Nataša Božić
- Department of Chemistry, Institute of Chemistry, Technology and Metallurgy, National Institute of the Republic of Serbia, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia.
| | - Henriëtte J Rozeboom
- Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, 9747AG Groningen, the Netherlands
| | - Nikola Lončar
- GECCO Biotech, Nijenborgh 4, Groningen 9747AG, the Netherlands
| | - Marinela Šokarda Slavić
- Department of Chemistry, Institute of Chemistry, Technology and Metallurgy, National Institute of the Republic of Serbia, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia
| | - Dick B Janssen
- Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, 9747AG Groningen, the Netherlands
| | - Zoran Vujčić
- Department of Biochemistry, Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia
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7
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Juarez-Arellano EA, Urzua-Valenzuela M, Peña-Rico MA, Aparicio-Saguilan A, Valera-Zaragoza M, Huerta-Heredia AA, Navarro-Mtz AK. Planetary ball-mill as a versatile tool to controlled potato starch modification to broaden its industrial applications. Food Res Int 2020; 140:109870. [PMID: 33648188 DOI: 10.1016/j.foodres.2020.109870] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 08/25/2020] [Accepted: 10/28/2020] [Indexed: 10/23/2022]
Abstract
Pure potato starch has been modified by high-energy-ball-milling as a function of energy supplied, aiming to obtain products for different possibilities of industrial application. Burgios's equation has been used to calculate the energy supplied. The effect of the milling has been followed by a characterization of the starch morphology, crystallinity, solubility, swelling, retrogradation, viscosity, apparent viscosity, functional groups, and reducing sugar concentration. The high-energy-ball-milling not only changes the physical properties but also induces the mechanolysis of potato starch, breaking the glycosidic linkages of the starch molecules. A representation of the possible mechanism of starch mechanolysis is proposed. Three stages of the transformation of potato starch through high-energy ball-milling can be identified. Each of these stages generates starch with properties that can be used in different industrial applications.
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Affiliation(s)
- E A Juarez-Arellano
- Instituto de Química Aplicada, Universidad del Papaloapan, Circuito Central 200, Parque Industrial, 68301 Tuxtepec, Oaxaca, Mexico
| | - M Urzua-Valenzuela
- División de Estudios de Posgrado, Maestría en Ciencias Químicas, Universidad del Papaloapan, Circuito Central 200, Parque Industrial, 68301 Tuxtepec, Oaxaca, Mexico
| | - M A Peña-Rico
- Instituto de Biotecnología, Universidad del Papaloapan, Circuito Central 200, Parque Industrial, 68301 Tuxtepec, Oaxaca, Mexico
| | - A Aparicio-Saguilan
- Instituto de Biotecnología, Universidad del Papaloapan, Circuito Central 200, Parque Industrial, 68301 Tuxtepec, Oaxaca, Mexico
| | - M Valera-Zaragoza
- Instituto de Química Aplicada, Universidad del Papaloapan, Circuito Central 200, Parque Industrial, 68301 Tuxtepec, Oaxaca, Mexico
| | - A A Huerta-Heredia
- Instituto de Biotecnología, Universidad del Papaloapan, Circuito Central 200, Parque Industrial, 68301 Tuxtepec, Oaxaca, Mexico
| | - A K Navarro-Mtz
- Instituto de Biotecnología, Universidad del Papaloapan, Circuito Central 200, Parque Industrial, 68301 Tuxtepec, Oaxaca, Mexico.
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Zeng J, Guo J, Tu Y, Yuan L. Functional study of C-terminal domain of the thermoacidophilic raw starch-hydrolyzing α-amylase Gt-amy. Food Sci Biotechnol 2020; 29:409-418. [PMID: 32257525 DOI: 10.1007/s10068-019-00673-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 07/23/2019] [Accepted: 08/13/2019] [Indexed: 10/26/2022] Open
Abstract
Since the thermoacidophilic raw-starch hydrolyzing α-amylase Gt-amy can effectively hydrolyze corn starch under starch liquefaction conditions, it has potential for many industrial applications. To identify the raw starch-binding domain of Gt-amy, a C-terminal domain (CTD)-truncated mutant (Gt-amy-T) was constructed, and its enzymatic properties were compared with Gt-amy. In comparison to CTD of Gt-amy, which could effectively bind corn starch, the Gt-amy-T could not bind to and hydrolyze corn starch under similar conditions. In addition, Gt-amy-T showed significantly lower thermal activity and thermal stability. Using soluble starch as the substrate, the k cat of Gt-amy-T at 80 °C was approximately 77.9% of that of Gt-amy. The half-life of Gt-amy at 80 °C was 3 h, while that of Gt-amy-T was 2 h. These results reveal that the CTD plays a vital role in raw starch binding and degradation by Gt-amy and helps Gt-amy maintain thermal activity and stability.
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Affiliation(s)
- Jing Zeng
- 1Institute of Microbiology, Jiangxi Academy of Sciences, No. 7777 Changdong Avenue, Nanchang, 330096 Jiangxi Province China
| | - Jianjun Guo
- 1Institute of Microbiology, Jiangxi Academy of Sciences, No. 7777 Changdong Avenue, Nanchang, 330096 Jiangxi Province China
| | - Yikun Tu
- 2School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211800 China
| | - Lin Yuan
- 1Institute of Microbiology, Jiangxi Academy of Sciences, No. 7777 Changdong Avenue, Nanchang, 330096 Jiangxi Province China
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9
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Fang W, Xue S, Deng P, Zhang X, Wang X, Xiao Y, Fang Z. AmyZ1: a novel α-amylase from marine bacterium Pontibacillus sp. ZY with high activity toward raw starches. BIOTECHNOLOGY FOR BIOFUELS 2019; 12:95. [PMID: 31044008 PMCID: PMC6477751 DOI: 10.1186/s13068-019-1432-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Accepted: 04/12/2019] [Indexed: 05/03/2023]
Abstract
BACKGROUND Starch is an inexpensive and renewable raw material for numerous industrial applications. However, most starch-based products are not cost-efficient due to high-energy input needed in traditional enzymatic starch conversion processes. Therefore, α-amylase with high efficiency to directly hydrolyze high concentration raw starches at a relatively lower temperature will have a profound impact on the efficient application of starch. RESULTS A novel raw starch digesting α-amylase (named AmyZ1) was screened and cloned from a deep-sea bacterium Pontibacillus sp. ZY. Phylogenetic analysis showed that AmyZ1 was a member of subfamily 5 of glycoside hydrolase family 13. When expressed in Escherichia coli, the recombinant AmyZ1 showed high activity at pH 6.0-7.5 and 25-50 °C. Its optimal pH and temperature were 7.0 and 35 °C, respectively. Similar to most α-amylases, AmyZ1 activity was enhanced (2.4-fold) by 1.0 mM Ca2+. Its half-life time at 35 °C was also extended from about 10 min to 100 min. In comparison, AmyZ1 showed a broad substrate specificity toward raw starches, including those derived from rice, corn, and wheat. The specific activity of AmyZ1 towards raw rice starch was 12,621 ± 196 U/mg, much higher than other reported raw starch hydrolases. When used in raw starch hydrolyzing process, AmyZ1 hydrolyzed 52%, 47% and 38% of 30% (w/v) rice, corn, and wheat starch after 4 h incubation. It can also hydrolyze marine raw starch derived from Chlorella pyrenoidosa, resulting in 50.9 mg/g DW (dry weight of the biomass) of reducing sugars after 4 h incubation at 35 °C. Furthermore, when hydrolyzing raw corn starch using the combination of AmyZ1 and commercial glucoamylase, the hydrolysis rate reached 75% after 4.5 h reaction, notably higher than that obtained in existing starch-processing industries. CONCLUSIONS As a novel raw starch-digesting α-amylase with high specific activity, AmyZ1 efficiently hydrolyzed raw starches derived from both terrestrial and marine environments at near ambient temperature, suggesting its application potential in starch-based industrial processes.
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Affiliation(s)
- Wei Fang
- School of Life Sciences, Anhui University, Hefei, 230601 Anhui China
- Anhui Key Laboratory of Modern Biomanufacturing, Hefei, 230601 Anhui China
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, Hefei, 230601 Anhui China
| | - Saisai Xue
- School of Life Sciences, Anhui University, Hefei, 230601 Anhui China
- Anhui Key Laboratory of Modern Biomanufacturing, Hefei, 230601 Anhui China
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, Hefei, 230601 Anhui China
| | - Pengjun Deng
- School of Life Sciences, Anhui University, Hefei, 230601 Anhui China
- Anhui Key Laboratory of Modern Biomanufacturing, Hefei, 230601 Anhui China
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, Hefei, 230601 Anhui China
| | - Xuecheng Zhang
- School of Life Sciences, Anhui University, Hefei, 230601 Anhui China
- Anhui Key Laboratory of Modern Biomanufacturing, Hefei, 230601 Anhui China
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, Hefei, 230601 Anhui China
| | - Xiaotang Wang
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199 USA
| | - Yazhong Xiao
- School of Life Sciences, Anhui University, Hefei, 230601 Anhui China
- Anhui Key Laboratory of Modern Biomanufacturing, Hefei, 230601 Anhui China
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, Hefei, 230601 Anhui China
| | - Zemin Fang
- School of Life Sciences, Anhui University, Hefei, 230601 Anhui China
- Anhui Key Laboratory of Modern Biomanufacturing, Hefei, 230601 Anhui China
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, Hefei, 230601 Anhui China
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Peng H, Zhai L, Xu S, Xu P, He C, Xiao Y, Gao Y. Efficient Hydrolysis of Raw Microalgae Starch by an α-Amylase (AmyP) of Glycoside Hydrolase Subfamily GH13_37. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:12748-12755. [PMID: 30441891 DOI: 10.1021/acs.jafc.8b03524] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Microalgae starch is receiving increasing attention as a renewable feedstock for biofuel production. Raw microalgae starch from Tetraselmis subcordiformis was proven to be very efficiently hydrolyzed by an α-amylase (AmyP) of glycoside hydrolase subfamily GH13_37 below the temperature of gelatinization (40 °C). The hydrolysis degree reached 74.4 ± 2.2% for 4% raw microalgae starch and 53.2 ± 1.7% for 8% raw microalgae starch after only 2 h. The hydrolysis efficiency was significantly stimulated by calcium ions. The enzyme catalysis of AmyP and its mutants (Q306A and E347A) suggested that calcium ions contributed to the hydrolysis of cyclic structures in raw microalgae starch by a distinctive calcium-binding site Ca2 of AmyP. The study explored raw microalgae starch as a new resource for cold enzymatic hydrolysis and extended our knowledge on the function of calcium in amylolytic enzyme.
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Affiliation(s)
- Hui Peng
- Anhui Key Laboratory of Modern Biomanufacturing, School of Life Sciences, School of Resources and Environmental Engineering , Anhui University , Hefei 230601 , Anhui P.R. China
| | - Lu Zhai
- Anhui Key Laboratory of Modern Biomanufacturing, School of Life Sciences, School of Resources and Environmental Engineering , Anhui University , Hefei 230601 , Anhui P.R. China
| | - Suo Xu
- Anhui Key Laboratory of Modern Biomanufacturing, School of Life Sciences, School of Resources and Environmental Engineering , Anhui University , Hefei 230601 , Anhui P.R. China
| | - Peng Xu
- Anhui Key Laboratory of Modern Biomanufacturing, School of Life Sciences, School of Resources and Environmental Engineering , Anhui University , Hefei 230601 , Anhui P.R. China
| | - Chao He
- Anhui Key Laboratory of Modern Biomanufacturing, School of Life Sciences, School of Resources and Environmental Engineering , Anhui University , Hefei 230601 , Anhui P.R. China
| | - Yazhong Xiao
- Anhui Key Laboratory of Modern Biomanufacturing, School of Life Sciences, School of Resources and Environmental Engineering , Anhui University , Hefei 230601 , Anhui P.R. China
| | - Yi Gao
- Anhui Key Laboratory of Modern Biomanufacturing, School of Life Sciences, School of Resources and Environmental Engineering , Anhui University , Hefei 230601 , Anhui P.R. China
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Functional characterization and crystal structure of thermostable amylase from Thermotoga petrophila , reveals high thermostability and an unusual form of dimerization. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2017. [DOI: 10.1016/j.bbapap.2017.06.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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12
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High-level production of α-amylase by manipulating the expression of alanine racamase in Bacillus licheniformis. Biotechnol Lett 2017; 39:1389-1394. [DOI: 10.1007/s10529-017-2359-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 05/09/2017] [Indexed: 01/04/2023]
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