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Protein & Peptide Letters

Editor-in-Chief

ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

Research Article

Effect of Propeptide Mutations on the Directed Evolution of Rhizomucor miehei Lipase

Author(s): Jue Wang*, Rong Bai, Na Wu, Yumin Zhang and Lili Hu

Volume 29, Issue 4, 2022

Published on: 14 April, 2022

Page: [360 - 369] Pages: 10

DOI: 10.2174/0929866529666220314105130

Price: $65

Abstract

Background: A series of mutants of Rhizomucor miehei lipase (RML) screened through four rounds of directed evolution were studied. Mutants' triglyceride hydrolysis activity was assessed, and their genes were sequenced. Results showed that mutations in the propeptide can improve the activity of RML during evolution. Two parts of propeptide (wild-type and mutant) and mature region were connected by molecular simulation technology.

Methods: The spatial structure of the most positive mutants containing the mutations in the propeptide was mainly characterized by the increase in the opening angle of the lid structure in the mature region of RML, the enhancement of the hydrophobicity of the active center, and the triad of the active center shifted outward.

Results: The three indexes above explain the mechanism of propeptide mutations on the activity change of the target protein. In addition, statistical analysis of all the mutants screened in directed evolution showed that: (1) most of the mutants with increased activity contained mutations of the propeptide, (2) in the later stage of directed evolution, the number of active mutants decreased gradually, and the mutations of inactivated protein mainly occurred in the mature region, and (3) in the last round of directed evolution, the mutations distributed in the propeptide improved the mutant activity further. The results showed that the propeptide reduced RML's evolutionary pressure and delayed the emergence of the evolutionary platform.

Conclusion: These findings reveal the role of propeptide in the evolution of RML and provide strategies for the molecular transformation of other lipases.

Keywords: Lipase, propeptide, activity, directed evolution, mutations, lid structure, active center.

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Graphical Abstract

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