Download MendeleyRational Design for Broadened Substrate Specificity and Enhanced Activity of a Novel Acetyl Xylan Esterase from Bacteroides thetaiotaomicron.
Wang, L., Han, X., Wang, Y., Wei, X., Liu, S., Shao, S., Yang, S., Sun, L., Xin, F.(2021) J Agric Food Chem 69: 6665-6675
- PubMed: 34074097
- DOI: https://doi.org/10.1021/acs.jafc.1c00750
- Primary Citation of Related Structures:
7DWC - PubMed Abstract:
Gut bacteria-derived enzymes play important roles in the metabolism of dietary fiber through enabling the hydrolysis of polysaccharides. In this study, we identified and characterized a 29 kDa novel acetyl xylan esterase, BT Axe1, from Bacteroides thetaiotaomicron VPI5482. Then, we solved the structure of BT Axe1 and performed the rational design. Mutants N65S and N65A increased the activities toward short-chain ( p NPA, p NPB) to near four-fold, and gained the activities toward longer-chain substrate ( p NPO). Molecular docking analysis showed that the mutant N65S had a larger substrate binding pocket than the wild type. Hydrolysis studies using natural substrates showed that either N65S or N65A showed higher activity of that of wild-type, yielding 131.31 and 136.09 mM of acetic acid from xylan. This is the first study on the rational design of gut bacteria-derived Axes with broadened substrate specificity and enhanced activity, which can be referenced by other acetyl esterases or gut-derived enzymes.
Organizational Affiliation:
Laboratory of Biomanufacturing and Food Engineering, Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
