期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 184, 期 -, 页码 92-100出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.06.033
关键词
Feruloyl esterase; Lactobacillus plantarum; Catalytic mechanism
资金
- National Natural Science Foundation of China [31801475]
- China National Key Research and Development Plan Project 'modern food processing and food storage and transportation technology and equipment' [2017YFD0400204]
- Central Public-interest Scientific Institution Basal Research Fund, CAFS [S2020JBKY-13]
This study revealed the high activity substrate and crystal structure of LP_0796, demonstrating the importance of certain key residues to its catalytic activity, while also identifying mutation sites that can enhance catalytic efficiency.
Feruloyl esterase is an indispensable biocatalyst in food processing, pesticide and pharmaceutical industries, catalyzing the cleavage of the ester bond cross-linked between the polysaccharide side chain of hemicellulose and ferulic acid in plant cell walls. LP_0796 from Lactobacillus plantarum was identified as a feruloyl esterase that may have potential applications in the food industry, but the lack of the substrate recognition and catalytic mechanisms limits its application. Here, LP_0796 showed the highest activity towards methyl caffeate at pH 6.6 and 40 degrees C. The crystal structure of LP_0796 was determined at 2.5 angstrom resolution and featured a catalytic triad Asp195-containing loop facing the opposite direction, thus forming a wider substrate binding pocket. Molecular docking simulation and site-directed mutagenesis studies further demonstrated that in addition to the catalytic triad (Ser94, Asp195, His225), Arg125 and Val128 played essential roles in the function of the active site. Our data also showed that Asp mutation of Ala23 and Ile198 increased the catalytic efficiency to 4- and 5-fold, respectively. Collectively, this work provided a better understanding of the substrate recognition and catalytic mechanisms of LP_0796 and may facilitate the future protein design of this important feruloyl esterase.
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