Abstract
Chitosanase plays an important role in chitooligosaccharides (COS) production. We found that the chitosanase (BaCsn46A) of Bacillus amyloliquefacien was a good candidate for chitosan hydrolysis of COS. In order to further improve the enzyme properties of BaCsn46A, the S196 located near the active center was found to be a critical site impacts on enzyme properties by sequence alignment analysis. Herein, saturation mutation was carried out to study role of 196 site on BaCsn46A catalytic function. Compared with WT, the specific enzyme activity of S196A increased by 118.79%, and the thermostability of S196A was much higher than WT. In addition, we found that the enzyme activity of S196P was 2.41% of that of WT, indicating that the type of amino acid in 196 site could significant affect the catalytic activity and thermostability of BaCsn46A. After molecular docking analysis we found that the increase in hydrogen bonds and decrease in unfavorable bonds interacting with the substrate were the main reason for the change of enzyme properties which is valuable for future studies on Bacillus species chitosanase.
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Funding
This work was supported by the applied basic Research Program of Changzhou (CJ20220080), the Key Research and Development Program of Shandong Province, China (2019JZZY020605). Applied basic Research Program of Changzhou, CJ20220080, Jing Guo,Key Research and Development Program of Sichuan Province, 2019JZZY020605, Jing Guo
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Conceptualization: CZQ Methodology: GJ Data analysis: GWJ and WY Software: GJ and GWJ Writing original manuscript: GJ Review and revising manuscript: CZQ, XKP, LW and HTT Funding acquisition: GJ and CZQ. All authors reviewed and approved the final manuscript.
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Jing, G., Wenjun, G., Yi, W. et al. Enhancing Enzyme Activity and Thermostability of Bacillus amyloliquefaciens Chitosanase BaCsn46A Through Saturation Mutagenesis at Ser196. Curr Microbiol 80, 180 (2023). https://doi.org/10.1007/s00284-023-03281-5
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DOI: https://doi.org/10.1007/s00284-023-03281-5