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Title: Identification and structural analysis of a thermophilic β-1,3-glucanase from compost

Abstract

β-1,3-glucanase can specifically hydrolyze glucans to oligosaccharides and has potential applications in biotechnology. We used the metatranscriptomic technology to discover a thermophilic β-1,3-glucanase from compost. The phylogenetic study shows that it belongs to the family 16 glycoside hydrolase (GH16) and is most homologous with an enzyme from Streptomyces sioyaensis, an actinobacterium. It has the activity of 146.9 U/mg in the optimal reaction condition (75 °C and pH 5.5). Its catalytic domain was crystallized and diffracted to 1.14 Å resolution. The crystal structure shows a sandwich-like β-jelly-roll fold with two disulfide bonds. After analyzing the occurring frequencies of these cysteine residues, we designed two mutants (C160G and C180I) to study the role of these disulfide bonds. Both mutants have decreased their optimal temperature from 75 to 70 °C, which indicate that the disulfide bonds are important to maintain thermostability. Interestingly, the activity of C160G has increased ~ 17% to reach 171.4 U/mg. We speculate that the increased activity of C160G mutant is due to increased dynamics near the active site. Our studies give a good example of balancing the rigidity and flexibility for enzyme activity, which is helpful for protein engineering.

Authors:
 [1];  [2];  [1]; ORCiD logo [3];  [4];  [1]; ORCiD logo [1]
  1. Nanjing Agricultural University (China)
  2. Zhejiang Univ. of Technology, Hangzhou (China). Key Laboratory of Bioorganic Synthesis of Zhejiang Province
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Qingdao Vland Biotech Group Inc., Qingdao (China)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1830100
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Bioresources and Bioprocessing
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2197-4365
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; β-1,3-glucanase; Crystal structure; Disulfde bond; Mutagenesis; Molecular dynamics

Citation Formats

Feng, Jianwei, Xu, Shenyuan, Feng, Ruirui, Kovalevsky, Andrey, Zhang, Xia, Liu, Dongyang, and Wan, Qun. Identification and structural analysis of a thermophilic β-1,3-glucanase from compost. United States: N. p., 2021. Web. doi:10.1186/s40643-021-00449-4.
Feng, Jianwei, Xu, Shenyuan, Feng, Ruirui, Kovalevsky, Andrey, Zhang, Xia, Liu, Dongyang, & Wan, Qun. Identification and structural analysis of a thermophilic β-1,3-glucanase from compost. United States. https://doi.org/10.1186/s40643-021-00449-4
Feng, Jianwei, Xu, Shenyuan, Feng, Ruirui, Kovalevsky, Andrey, Zhang, Xia, Liu, Dongyang, and Wan, Qun. Sun . "Identification and structural analysis of a thermophilic β-1,3-glucanase from compost". United States. https://doi.org/10.1186/s40643-021-00449-4. https://www.osti.gov/servlets/purl/1830100.
@article{osti_1830100,
title = {Identification and structural analysis of a thermophilic β-1,3-glucanase from compost},
author = {Feng, Jianwei and Xu, Shenyuan and Feng, Ruirui and Kovalevsky, Andrey and Zhang, Xia and Liu, Dongyang and Wan, Qun},
abstractNote = {β-1,3-glucanase can specifically hydrolyze glucans to oligosaccharides and has potential applications in biotechnology. We used the metatranscriptomic technology to discover a thermophilic β-1,3-glucanase from compost. The phylogenetic study shows that it belongs to the family 16 glycoside hydrolase (GH16) and is most homologous with an enzyme from Streptomyces sioyaensis, an actinobacterium. It has the activity of 146.9 U/mg in the optimal reaction condition (75 °C and pH 5.5). Its catalytic domain was crystallized and diffracted to 1.14 Å resolution. The crystal structure shows a sandwich-like β-jelly-roll fold with two disulfide bonds. After analyzing the occurring frequencies of these cysteine residues, we designed two mutants (C160G and C180I) to study the role of these disulfide bonds. Both mutants have decreased their optimal temperature from 75 to 70 °C, which indicate that the disulfide bonds are important to maintain thermostability. Interestingly, the activity of C160G has increased ~ 17% to reach 171.4 U/mg. We speculate that the increased activity of C160G mutant is due to increased dynamics near the active site. Our studies give a good example of balancing the rigidity and flexibility for enzyme activity, which is helpful for protein engineering.},
doi = {10.1186/s40643-021-00449-4},
journal = {Bioresources and Bioprocessing},
number = 1,
volume = 8,
place = {United States},
year = {Sun Oct 17 00:00:00 EDT 2021},
month = {Sun Oct 17 00:00:00 EDT 2021}
}

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