Method for Increasing Expression Level of Recombinant Proteins in Bacillus Subtilis Through Co-expressing Bacillus-derived Enhancer Factor

Abstract

Disclosed is a method for increasing expression level of recombinant proteins in Bacillus subtilis through co-expressing Bacillus-derived enhancer factor, belonging to the technical field of enzyme engineering. According to the present disclosure, genes encoding recombinant proteins are respectively co-expressed with Bacillus-derived PonA, PonA truncated forms, OppA or SppA, so as to improve the expression level of the recombinant proteins. The results show that the method provided by the present disclosure can increase the expression level of ultra-high temperature amylase, medium temperature amylase or sucrose isomerase at the shake flask level to 3.96 times, 1.49 times and 2.26 times. The expression level of ultra-high temperature amylase can be increased by 26% in high-density fermentation of a 3L bioreactor. The B. subtilis provides a new developable target as an recombinant protein expression host, and provides technical support for the optimization and modification of the enhancer factors.

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