Characterization and structural analysis of a leucine aminopeptidase using site-directed mutagenesis.

IF 3.5 3区 生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Yuqi Men, Yang Liu, Dongjie Yin, Guan Wang, Rui Qin, Hairong Xiong, Yawei Wang
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引用次数: 0

Abstract

Amp0279 (EC 3.4.11.24, GenBank: CP000817.1) is a Co2+-dependent leucine aminopeptidase from the Lysinibacillus sphaericus C3-41 genome. After analyses using molecular docking and spatial structure analysis, site-directed mutagenesis mutants were performed as Amp0279-R131E, Amp0279-R131H, Amp0279-R131A and Amp0279-E349D. The optimum pH of Amp0279-R131E was shifted from the original 8.5 to 7.5, and the overall electrostatic potential was shifted towards acidic. Compared with the original enzyme, the mutant proteins all gained better structural stability, especially the apparent melting temperature (Tm) of Amp0279-R131H increased from 41.8 to 45.5 °C. Morever, when protein was bound to the substrate, the Tm of Amp0279-R131E was increased by 7.3 °C and Amp0279-R131H increased by 5.4 °C, compared to the original enzyme. This is consistent with the results that the mutants acquired higher binding energies to the substrates, and an increase the hydrogen bonding force. In addition, the molecular docking of mutant and substrate revealed that the truncation of R131 contributes to the increase in the binding capacity of the substrate molecules to the active centre. In contrast, the presence of π-Cation interactions generated by R131 with the substrate has an important effect on the ability of Amp0279 to hydrolyse the substrate. This study demostrated that R131 is a key site for activity and stability, which is important in the future exploration of the functional structure of Amp0279.

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来源期刊
AMB Express
AMB Express BIOTECHNOLOGY & APPLIED MICROBIOLOGY-
CiteScore
7.20
自引率
2.70%
发文量
141
审稿时长
13 weeks
期刊介绍: AMB Express is a high quality journal that brings together research in the area of Applied and Industrial Microbiology with a particular interest in ''White Biotechnology'' and ''Red Biotechnology''. The emphasis is on processes employing microorganisms, eukaryotic cell cultures or enzymes for the biosynthesis, transformation and degradation of compounds. This includes fine and bulk chemicals, polymeric compounds and enzymes or other proteins. Downstream processes are also considered. Integrated processes combining biochemical and chemical processes are also published.
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