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Nie M, Khalid F, Hu Q, Khalid A, Wu Q, Huang S, Wang Z. Site-Directed Mutagenesis: Improving the Acid Resistance and Thermostability of Bacillus velezensis α-Amylase and Its Preliminary Feed Application. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:10487-10496. [PMID: 38683727 DOI: 10.1021/acs.jafc.4c01630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
The current study aimed to improve the acid resistance and thermostability of Bacillus velezensis α-amylase through site-directed mutagenesis, with a specific focus on its applicability to the feed industry. Four mutation sites, P546E, H572D, A614E, and K622E, were designed in the C domain of α-amylase, and three mutants, Mut1 (E), Mut2 (ED), and Mut3 (EDEE), were produced. The results showed that the specific activity of Mut3 was 50 U/mg higher than the original α-amylase (Ori) after incubation at 40 °C for 4 h. Compared to Ori, the acid resistance of Mut3 showed a twofold increase in specific activity at pH 2.0. Moreover, the results of preliminary feed hydrolysis were compared between Ori and Mut3 by designing three factors, three levels of orthogonal experiment for enzymatic hydrolysis time, feed quantity, and amount of amylase. It was observed that the enzymatic hydrolysis time and feed quantity showed an extremely significant difference (p < 0.01) in Mut3 compared to Ori. However, the amount of enzyme showed significant (p < 0.05) improvement in the enzymatic hydrolysis in Mut3 as compared to Ori. The study identified Mut3 as a promising candidate for the application of α-amylase in the feed industry.
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Affiliation(s)
- Ming Nie
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Hefei 230036, Anhui, People's Republic of China
- School of Chemical and Biomolecular Engineering, Faculty of Engineering, The University of Sydney, Camperdown, NSW 2006, Australia
- School of Food and Bioengineering, Hefei University of Technology, Hefei 230009, Anhui, People's Republic of China
| | - Fatima Khalid
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Hefei 230036, Anhui, People's Republic of China
| | - Qian Hu
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Hefei 230036, Anhui, People's Republic of China
| | - Anam Khalid
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Hefei 230036, Anhui, People's Republic of China
| | - Qi Wu
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Hefei 230036, Anhui, People's Republic of China
| | - Shoujun Huang
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Hefei 230036, Anhui, People's Republic of China
| | - Zaigui Wang
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Hefei 230036, Anhui, People's Republic of China
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El-Gendi H, Saleh AK, Badierah R, Redwan EM, El-Maradny YA, El-Fakharany EM. A Comprehensive Insight into Fungal Enzymes: Structure, Classification, and Their Role in Mankind's Challenges. J Fungi (Basel) 2021; 8:23. [PMID: 35049963 PMCID: PMC8778853 DOI: 10.3390/jof8010023] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/22/2021] [Accepted: 12/25/2021] [Indexed: 11/16/2022] Open
Abstract
Enzymes have played a crucial role in mankind's challenges to use different types of biological systems for a diversity of applications. They are proteins that break down and convert complicated compounds to produce simple products. Fungal enzymes are compatible, efficient, and proper products for many uses in medicinal requests, industrial processing, bioremediation purposes, and agricultural applications. Fungal enzymes have appropriate stability to give manufactured products suitable shelf life, affordable cost, and approved demands. Fungal enzymes have been used from ancient times to today in many industries, including baking, brewing, cheese making, antibiotics production, and commodities manufacturing, such as linen and leather. Furthermore, they also are used in other fields such as paper production, detergent, the textile industry, and in drinks and food technology in products manufacturing ranging from tea and coffee to fruit juice and wine. Recently, fungi have been used for the production of more than 50% of the needed enzymes. Fungi can produce different types of enzymes extracellularly, which gives a great chance for producing in large amounts with low cost and easy viability in purified forms using simple purification methods. In the present review, a comprehensive trial has been advanced to elaborate on the different types and structures of fungal enzymes as well as the current status of the uses of fungal enzymes in various applications.
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Affiliation(s)
- Hamada El-Gendi
- Bioprocess Development Department, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technological Applications (SRTA-City), Universities and Research Institutes Zone, New Borg El-Arab, Alexandria 21934, Egypt;
| | - Ahmed K. Saleh
- Cellulose and Paper Department, National Research Centre, El-Tahrir St., Dokki, Giza 12622, Egypt;
| | - Raied Badierah
- Biological Science Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (R.B.); (E.M.R.)
- Medical Laboratory, King Abdulaziz University Hospital, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - Elrashdy M. Redwan
- Biological Science Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (R.B.); (E.M.R.)
- Protein Research Department, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg EL-Arab, Alexandria 21934, Egypt;
| | - Yousra A. El-Maradny
- Protein Research Department, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg EL-Arab, Alexandria 21934, Egypt;
| | - Esmail M. El-Fakharany
- Protein Research Department, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg EL-Arab, Alexandria 21934, Egypt;
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