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Pasin TM, Salgado JCS, Scarcella ASDA, de Oliveira TB, de Lucas RC, Cereia M, Rosa JC, Ward RJ, Buckeridge MS, Polizeli MDLTDM. A Halotolerant Endo-1,4-β-Xylanase from Aspergillus clavatus with Potential Application for Agroindustrial Residues Saccharification. Appl Biochem Biotechnol 2020; 191:1111-1126. [PMID: 31960367 DOI: 10.1007/s12010-020-03232-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [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: 11/01/2019] [Accepted: 01/08/2020] [Indexed: 01/30/2023]
Abstract
The use of non-potable water (such as seawater) is an attractive alternative for water intensive processes such as biomass pretreatment and saccharification steps in the production of biochemicals and biofuels. Identification and application of halotolerant enzymes compatible with high-salt conditions may reduce the energy needed for non-potable water treatment and decrease waste treatment costs. Here we present the biochemical properties of a halotolerant endo-1,4-β-xylanase produced by Aspergillus clavatus in submerged fermentation, using paper sludge (XPS) and sugarcane bagasse (XSCB), and its potential application in the hydrolysis of agroindustrial residues. The peptide mass fingerprint and amino acid sequencing of the XPS and XSCB enzymes showed primary structure similarities with an endo-1,4-β-xylanase from Aspergillus clavatus (XYNA_ASPCL). Both enzyme preparations presented good thermal stability at 50 °C and were stable over a wide range of pH and Vmax up to 2450 U/mg for XPS. XPS and XSCB were almost fully stable even after 24 h of incubation in the presence of up to 3 M NaCl, and their activity were not affected by 500 mM NaCl. Both enzyme preparations were capable of hydrolyzing paper sludge and sugarcane bagasse to release reducing sugars. These characteristics make this xylanase attractive to be used in the hydrolysis of biomass, particularly with brackish water or seawater.
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Affiliation(s)
- Thiago Machado Pasin
- Department of Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - José Carlos Santos Salgado
- Department of Chemistry, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14040-901, Brazil
| | - Ana Sílvia de Almeida Scarcella
- Department of Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Tássio Brito de Oliveira
- Department of Biology, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14040-901, Brazil
| | - Rosymar Coutinho de Lucas
- Department of Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
- Department of Biology, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14040-901, Brazil
| | - Mariana Cereia
- Department of Biology, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14040-901, Brazil
| | - José César Rosa
- Protein Chemistry Center and Department of Molecular and Cell Biology and Pathogenic Bioagents, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Richard John Ward
- Department of Chemistry, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14040-901, Brazil
| | | | - Maria de Lourdes Teixeira de Moraes Polizeli
- Department of Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil.
- Department of Biology, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14040-901, Brazil.
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Takenaka S, Yoshinami J, Kuntiya A, Techapun C, Leksawasdi N, Seesuriyachan P, Chaiyaso T, Watanabe M, Tanaka K, Yoshida KI. Characterization and mutation analysis of a halotolerant serine protease from a new isolate of Bacillus subtilis. Biotechnol Lett 2017; 40:189-196. [PMID: 29038928 DOI: 10.1007/s10529-017-2459-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [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: 08/07/2017] [Accepted: 10/12/2017] [Indexed: 11/29/2022]
Abstract
OBJECTIVES A bacterial halotolerant enzyme was characterized to understand the molecular mechanism of salt adaptation and to explore its protein engineering potential. RESULTS Halotolerant serine protease (Apr_No16) from a newly isolated Bacillus subtilis strain no. 16 was characterized. Multiple alignments with previously reported non-halotolerant proteases, including subtilisin Carlsberg, indicated that Apr_No16 has eight acidic or polar amino acid residues that are replaced by nonpolar amino acids in non-halotolerant proteases. Those residues were hypothesized to be one of the primary contributors to salt adaptation. An eightfold mutant substituted with Ala residues exhibited 1.2- and 1.8-fold greater halotolerance at 12.5% (w/v) NaCl than Apr_No16 and Carlsberg, respectively. Amino acid substitution notably shifted the theoretical pI of the eightfold mutant, from 6.33 to 9.23, compared with Apr_No16. The resulting protein better tolerated high salt conditions. CONCLUSIONS Changing the pI of a bacterial serine protease may be an effective strategy to improve the enzyme's halotolerance.
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Affiliation(s)
- Shinji Takenaka
- Department of Agrobioscience, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501, Japan.
| | - Jyun Yoshinami
- Department of Agrobioscience, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501, Japan
| | - Ampin Kuntiya
- Bioprocess Research Cluster, The School of Agro-Industry, Faculty of Agro-Industry, Chiang Mai University, Chiang Mai, Thailand
| | - Charin Techapun
- Bioprocess Research Cluster, The School of Agro-Industry, Faculty of Agro-Industry, Chiang Mai University, Chiang Mai, Thailand
| | - Noppol Leksawasdi
- Bioprocess Research Cluster, The School of Agro-Industry, Faculty of Agro-Industry, Chiang Mai University, Chiang Mai, Thailand
| | - Phisit Seesuriyachan
- Bioprocess Research Cluster, The School of Agro-Industry, Faculty of Agro-Industry, Chiang Mai University, Chiang Mai, Thailand
| | - Thanongsak Chaiyaso
- Bioprocess Research Cluster, The School of Agro-Industry, Faculty of Agro-Industry, Chiang Mai University, Chiang Mai, Thailand
| | - Masanori Watanabe
- Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Yamagata, Japan
| | - Kosei Tanaka
- Organization of Advanced Science and Technology, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan
| | - Ken-Ichi Yoshida
- Department of Agrobioscience, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501, Japan.,Department of Science, Technology and Innovation, Graduate School of Science, Technology and Innovation, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan
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