Novel streptomyces trypsin GM2938 and heterologous expression thereof

Abstract

The invention discloses streptomyces trypsin protein, heterologous expression carrier establishment and enzymatic properties of streptomyces trypsin, and belongs to the technical field of biology. Thefull-length gene GM2938 is obtained by digging whole-gene data of edophytic steptomyces A249, the full length of the gene is 759 bp, 253 amino acids are encoded, and the gene is expanded in vitro through a PCR. The heterologous cloning, expressing and purifying of the trypsin gene GM2938 in bacillus subtilis SCK6 are realized for the first time, and the representation of the enzymatic propertiesof the trypsin is conducted. The trypsin has the quite good enzymatic properties and has broad prospects in the leather process and food industrial application.

Description

technical field [0001] The invention relates to the technical field of heterologous expression of streptomyces trypsin GM2938 and its application. Background technique [0002] Streptomyces trypsin is an important member of the microbial trypsin family because of its good biological safety, controllable production quality, non-calcium ion activation, homology with mammalian bovine trypsin and enzymatic properties It is also similar to bovine trypsin and other advantages, and is widely used in pharmaceuticals, clinical diagnosis, food processing, leather processing, biochemical detection and other fields. [0003] Compared with trypsin derived from mammals, microbial fermentation production can obtain trypsin with a single component and similar applications. However, due to the long fermentation period of Streptomyces itself, the industrial fermentation is not easy to control, the yield is low, and the secondary metabolites in the later stage affect the subsequent production....

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Problems solved by technology

[0003] Compared with trypsin derived from mammals, microbial fermentation production can obtain trypsin with a single component and similar applications. However, due to the long fermentation period of Streptomyces itself, the industrial fermentation is not easy to control, the yield is low, and the secondary metabolites in the later stage affect the subsequent production. Due to the shortcomings of enzyme purification and other shortcomings, researchers expect to use genetic engineering to obtain heterologous expression of Streptomyces trypsin

At present, the research on Streptomyces trypsin still has the following problems: (1) The development of trypsin-producing Streptomyces is insufficient, and there are few types of Streptomyces trypsin; (2) The content of GC in the Streptomyces trypsin gene is high, and it is difficult to achieve active Heterologous expression; (3) Enzyme yield is low, unable to meet industrial requirements

[0004] With the in-depth study of Streptomyces trypsin-encoding genes, some Streptomyces trypsins have been expressed in heterologous hosts; among them, Streptomyces freundii tryptase SFT is in E. coli The system is expressed in the form of zymogen, in Pichia The system is expressed in the form of a mature enzyme; the heterologous expression of Streptomyces griseus trypsin SGT has been studied more, and heterologous expression has been achieved in Escherichia coli, Streptomyces, Bacillus subtilis and Pichia pastoris respectively, but due to The GC content in the Streptomyces trypsin coding gene is high, and the protein itself contains three pairs of disulfide bonds, which makes its expression efficiency and yield low in most expression systems; therefore, choose a suitable signal peptide to construct a recombinant expression plasmid , which can provide guidance for the subsequent development and heterologous expression of other Streptomyces trypsins

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