期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 106, 期 -, 页码 312-319出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2017.08.015
关键词
Xylanase; Orpinomyces; Thermostability; Molecular dynamics simulation
资金
- Fundacao de Amparo A Pesquisa do Estado de Minas Gerais-FAPEMIG
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior CAPES
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-CNPq, Brazil
Xylanases catalyze the random hydrolysis of xylan backbone from plant biomass and thus, they have application in the production of biofuels, Kraft pulps biobleaching and feed industry. Here, xylanases derived from Orpinomyces sp. PC-2 were engineered guided by molecular dynamics methods to obtain more thermostable enzymes. Based on these models, 27 amino acid residues from the N-terminal were predicted to reduce protein stability and the impact of this removal was validated to two enzyme constructs: small xylanase Wild-Type (SWT) obtained from Wild-Type xylanase (WT) and small xylanase Mutant (SM2) generated from M2 mutant xylanase (V135A, A226T). The tail removal promoted increase in specific activity of purified SWT and SM2, which achieved 5,801.7 and 5,106.8 U mg(-1) of protein, respectively, while the WT activity was 444.1 U mg(-1) of protein. WT, SWT and SM2 showed half-life values at 50 degrees C of 0.8, 2.3 and 29.5 h, respectively. Overall, in view of the results, we propose that the presence of non-structured amino acid in the N-terminal leads to destabilization of the xylanases and may promote less access of the substrate to the active site. Therefore, its removal may promote increased stability and enzymatic activity, interesting properties that make them suitable for biotechnological applications. (C) 2017 Elsevier B.V. All rights reserved.
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