期刊
MOLECULAR BIOTECHNOLOGY
卷 60, 期 4, 页码 319-328出版社
HUMANA PRESS INC
DOI: 10.1007/s12033-018-0062-y
关键词
MAS1 lipase; Steric clash; Alanine substitution; Site-directed mutagenesis
资金
- National Natural Science Foundation of China [21376098, 31471690, 31601398]
- Science and Technology Planning project of Guangdong Province [2016B090920082]
MAS1 is a lipase isolated from Streptomyces sp. strain W007 with potential application in biotechnology. Structural analysis of MAS1 lipase showed that eight amino acids with bulkier side located in the substrate-binding pocket may be involved in affecting catalytic performance. Alanine substitutions of those residues were conducted to reduce steric clash of catalyzed pocket and probe their functional roles. The k (cat)/K (m) of mutants H108A, F153A, and V233A increased to 2.3-, 2.1-, and 1.4-fold, respectively. Interestingly, the half-life (60 A degrees C) of F153A had shifted to 523 min after mutagenesis, which was fivefold enhancement toward that of MAS1 wide-type. Furthermore, higher hydrolysis ability of mutants H108A and F153A toward palm stearin of high melting temperature made them potentially applicable in oil/fat modification. Our work provided an example to obtain biocatalysts with desired catalytic behaviors by protein engineering.
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