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Xu J, Zhang Y, Zhu X, Shen C, Liu S, Xiao Y, Fang Z. Direct evolution of an alkaline fungal laccase to degrade tetracyclines. Int J Biol Macromol 2024; 277:134534. [PMID: 39111464 DOI: 10.1016/j.ijbiomac.2024.134534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 04/06/2024] [Accepted: 08/04/2024] [Indexed: 08/13/2024]
Abstract
A fungal laccase-mediator system capable of high effectively oxidizing tetracyclines under a wide pH range will benefit environmental protection. This study reported a directed evolution of a laccase PIE5 to improve its performance on tetracyclines oxidization at alkaline conditions. Two mutants, namely MutA (D229N/A244V) and MutB (N123A/D229N/A244V) were obtained. Although they shared a similar optimum pH and temperature as PIE5, the two mutants displayed approximately 2- and 5-fold higher specific activity toward the mediators ABTS and guaiacol at pHs 4.0 to 6.5, respectively. Simultaneously, their catalytic efficiency increased by 8.0- and 6.4-fold compared to PIE5. At a pH range of 5-8 and 28 °C, MutA or MutB at a final concentration of 2.5 U·mL-1 degraded 77 % and 81 % of 100 mg·L-1 tetracycline within 10 min, higher than PIE5 (45 %). Furthermore, 0.1 U·mL-1 MutA or MutB completely degraded 100 mg·L-1 chlortetracycline within 6 min in the presence of 0.1 mM ABTS. At pH 8.0, MutA degraded tetracycline and chlortetracycline following the routine pathways were reported previously based on LC-MS analysis.
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Affiliation(s)
- Jie Xu
- School of Life Sciences, Anhui University, 230601 Hefei, Anhui, China; Anhui Key Laboratory of Biocatalysis and Modern Biomanufacturing, 230601 Hefei, Anhui, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, 230601 Hefei, Anhui, China
| | - Yinliang Zhang
- School of Life Sciences, Anhui University, 230601 Hefei, Anhui, China; Anhui Key Laboratory of Biocatalysis and Modern Biomanufacturing, 230601 Hefei, Anhui, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, 230601 Hefei, Anhui, China
| | - Xuelin Zhu
- School of Life Sciences, Anhui University, 230601 Hefei, Anhui, China; Anhui Key Laboratory of Biocatalysis and Modern Biomanufacturing, 230601 Hefei, Anhui, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, 230601 Hefei, Anhui, China
| | - Chen Shen
- School of Life Sciences, Anhui University, 230601 Hefei, Anhui, China; Anhui Key Laboratory of Biocatalysis and Modern Biomanufacturing, 230601 Hefei, Anhui, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, 230601 Hefei, Anhui, China
| | - Shenglong Liu
- School of Life Sciences, Anhui University, 230601 Hefei, Anhui, China; Anhui Key Laboratory of Biocatalysis and Modern Biomanufacturing, 230601 Hefei, Anhui, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, 230601 Hefei, Anhui, China
| | - Yazhong Xiao
- School of Life Sciences, Anhui University, 230601 Hefei, Anhui, China; Anhui Key Laboratory of Biocatalysis and Modern Biomanufacturing, 230601 Hefei, Anhui, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, 230601 Hefei, Anhui, China.
| | - Zemin Fang
- School of Life Sciences, Anhui University, 230601 Hefei, Anhui, China; Anhui Key Laboratory of Biocatalysis and Modern Biomanufacturing, 230601 Hefei, Anhui, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis, 230601 Hefei, Anhui, China.
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Ben Hmad I, Mokni Ghribi A, Bouassida M, Ayadi W, Besbes S, Ellouz Chaabouni S, Gargouri A. Combined effects of α-amylase, xylanase, and cellulase coproduced by Stachybotrys microspora on dough properties and bread quality as a bread improver. Int J Biol Macromol 2024; 277:134391. [PMID: 39094867 DOI: 10.1016/j.ijbiomac.2024.134391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 07/11/2024] [Accepted: 07/30/2024] [Indexed: 08/04/2024]
Abstract
This study aims to explore the feasibility of introducing, during the manufacture of bakery bread, an enzymatic cocktail coproduced by the fungus Stachybotrys microspora: α-amylases, xylanases and cellulases, using wheat bran as a nutrient source. Among the characteristics of the alveograph (dough tenacity "P" and dough extensibility "L"), the addition of a cocktail of enzymes at a concentration of 2 %, to weak wheat flour, has made it possible to significantly reduce its P/L ratio from 2.45 to 1.41. Furthermore, the use of enzyme cocktails at 2 %, 4 %, and 6 % concentrations increases the brown color of the bread crust. The great reduction in the rate of bread firmness, during storage over 5 days, was obtained in the presence of an enzyme cocktail in comparison with bread control (65.13 N for the control and 22.99 N, 23.24 N, and 18.24 N for bread enriched with enzyme cocktail at 2 %, 4 % and 6 % concentrations, respectively). In conclusion, the enzyme cocktail added can synergistically improve bread dough rheology and bread properties.
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Affiliation(s)
- Ines Ben Hmad
- Laboratory of Molecular Biotechnology of Eukaryotes, Center of Biotechnology of Sfax (CBS), University of Sfax, PO Box "1177" 3018, Sfax, Tunisia.
| | - Abir Mokni Ghribi
- Higher Institute of Applied Biology of Medenine, University of Gabes, Medenine, Tunisia; Laboratory of Analyze, Valorization and Foods Security, National School of Engineering, University of Sfax, PO Box 3038, Sfax, Tunisia
| | - Mouna Bouassida
- Laboratory of Environmental Bioprocesses, Center of Biotechnology of Sfax, University of Sfax, PO Box 1177, 3018 Sfax, Tunisia; Laboratory of Plant Improvement and Valorization of Agricultural Resources, National School of Engineering, Sfax University, P.O. Box 1173-3038, Tunisia
| | - Wajdi Ayadi
- Laboratory of Molecular Biotechnology of Eukaryotes, Center of Biotechnology of Sfax (CBS), University of Sfax, PO Box "1177" 3018, Sfax, Tunisia
| | - Souhail Besbes
- Laboratory of Analyze, Valorization and Foods Security, National School of Engineering, University of Sfax, PO Box 3038, Sfax, Tunisia
| | - Semia Ellouz Chaabouni
- Laboratory of Plant Improvement and Valorization of Agricultural Resources, National School of Engineering, Sfax University, P.O. Box 1173-3038, Tunisia
| | - Ali Gargouri
- Laboratory of Molecular Biotechnology of Eukaryotes, Center of Biotechnology of Sfax (CBS), University of Sfax, PO Box "1177" 3018, Sfax, Tunisia
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Martin E, Dubessay P, Record E, Audonnet F, Michaud P. Recent advances in laccase activity assays: A crucial challenge for applications on complex substrates. Enzyme Microb Technol 2024; 173:110373. [PMID: 38091836 DOI: 10.1016/j.enzmictec.2023.110373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 12/01/2023] [Accepted: 12/06/2023] [Indexed: 12/23/2023]
Abstract
Despite being one of the first enzymes discovered in 1883, the determination of laccase activity remains a scientific challenge, and a barrier to the full use of laccase as a biocatalyst. Indeed, laccase, an oxidase of the blue multi-copper oxidases family, has a wide range of substrates including substituted phenols, aromatic amines and lignin-related compounds. Its one-electron mechanism requires only oxygen and releases water as a reaction product. These characteristics make laccase a biocatalyst of interest in many fields of applications including pulp and paper industry, biorefineries, food, textile, and pharmaceutical industries. But to fully envisage the use of laccase at an industrial scale, its activity must be reliably quantifiable on complex substrates and in complex matrices. This review aims to describe current and emerging methods for laccase activity assays and place them in the context of a potential industrial use of the enzyme.
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Affiliation(s)
- Elise Martin
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, Institut Pascal, F-63000 Clermont-Ferrand, France
| | - Pascal Dubessay
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, Institut Pascal, F-63000 Clermont-Ferrand, France
| | - Eric Record
- INRAE, Aix-Marseille Université, UMR1163, Biodiversité et Biotechnologie Fongiques, 13288 Marseille, France
| | - Fabrice Audonnet
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, Institut Pascal, F-63000 Clermont-Ferrand, France
| | - Philippe Michaud
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, Institut Pascal, F-63000 Clermont-Ferrand, France.
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Wang J, Bai H, Zhang R, Ding G, Cai X, Wang W, Zhu G, Zhou P, Zhang Y. Effect of a Bacterial Laccase on the Quality and Micro-Structure of Whole Wheat Bread. J Microbiol Biotechnol 2023; 33:1671-1680. [PMID: 37915231 PMCID: PMC10772560 DOI: 10.4014/jmb.2305.05008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 06/18/2023] [Accepted: 07/18/2023] [Indexed: 11/03/2023]
Abstract
The gluten protein content in whole-wheat flour is low, which affects the elasticity and viscosity of the dough. Enzymatic modification of the protein may result in a network that mimics gluten, which plays an important role in the processing of whole-wheat foods. In this study, the effects of Halomonas alkaliantartica laccase (LacHa) on the quality parameters of whole-wheat bread were investigated. The optimum dosage of LacHa was 4 U/100 g of whole-wheat flour. At this dosage, whole-wheat bread exhibited the best specific volume and optimum texture parameters. Laccase also extended the storage duration of whole-wheat bread. We analyzed the micro-structure of the dough to determine its gluten-free protein extractable rate and free sulfhydryl group content, and verify that LacHa mediates cross-linking of gluten-free proteins. The results demonstrated that the cross-linking of gluten-free protein by LacHa improves the texture of whole-wheat bread. As a flour improver, LacHa has great developmental and application potential in baked-food production.
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Affiliation(s)
- Jingjing Wang
- School of Life Sciences, Hefei Normal University, Lianhua Road 1688, Hefei 230601, Anhui, P.R. China
- Department of Life Science, Anhui University, Hefei 230061, P.R. China
| | - Han Bai
- School of Life Sciences, Hefei Normal University, Lianhua Road 1688, Hefei 230601, Anhui, P.R. China
| | - Ran Zhang
- School of Life Sciences, Hefei Normal University, Lianhua Road 1688, Hefei 230601, Anhui, P.R. China
- Department of Life Science, Anhui University, Hefei 230061, P.R. China
| | - Guoao Ding
- School of Life Sciences, Hefei Normal University, Lianhua Road 1688, Hefei 230601, Anhui, P.R. China
- Department of Life Science, Anhui University, Hefei 230061, P.R. China
| | - Xuran Cai
- School of Life Sciences, Hefei Normal University, Lianhua Road 1688, Hefei 230601, Anhui, P.R. China
| | - Wei Wang
- School of Life Sciences, Hefei Normal University, Lianhua Road 1688, Hefei 230601, Anhui, P.R. China
| | - Guilan Zhu
- School of Life Sciences, Hefei Normal University, Lianhua Road 1688, Hefei 230601, Anhui, P.R. China
| | - Peng Zhou
- School of Life Sciences, Hefei Normal University, Lianhua Road 1688, Hefei 230601, Anhui, P.R. China
| | - Yan Zhang
- School of Life Sciences, Hefei Normal University, Lianhua Road 1688, Hefei 230601, Anhui, P.R. China
- Department of Life Science, Anhui University, Hefei 230061, P.R. China
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