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Indexed by:期刊论文

Date of Publication:2013-06-01

Journal:APPLIED MICROBIOLOGY AND BIOTECHNOLOGY

Included Journals:SCIE、EI、PubMed、Scopus

Volume:97

Issue:12

Page Number:5343-5350

ISSN No.:0175-7598

Key Words:Domain swapping; meta-Cleavage product hydrolase; Substrate specificity; Molecular simulation

Abstract:meta-Cleavage product (MCP) hydrolases can catalyze relatively low reactive carbon-carbon bond hydrolysis of products, which are derived from the meta-cleavage of catechols. The strict substrate selectivity of MCP hydrolases attracts an interest to understand the determinants of substrate specificity. Compared with conventional site-directed mutagenesis, domain swapping is an effective strategy to explore substrate specificity due to the large-scale reorganization of three-dimensional structure. In the present study, the hybrid MCP hydrolases BphD(LidA) and MfphA(LidD) were constructed by exchanging the lid domain of two parental enzymes MfphA and BphD. The residues Gly130/Ala196 (MfphA) and Gly136/Ala211 (BphD) were selected as crossover points according to structural disruption score analysis and molecular dynamics simulations. It was shown that the hybrid enzymes exhibited similar substrate selectivity with the parent enzyme providing the lid domain. Docking studies suggested that the lid domain may play a key role in determining substrate specificity by reshaping the active pocket and modulating the orientation of the substrate.