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Extracellular production of active vibriolysin engineered by random mutagenesis in Escherichia coli.

Abstract：

:Vibriolysin, an extracellular protease of Vibrio proteolyticus, is synthesized as a preproenzyme. The N-terminal propeptide functions as an intramolecular chaperone and an inhibitor of the mature enzyme. Extracellular production of recombinant vibriolysin has been achieved in Bacillus subtilis, but not in Escherichia coli, which is widely used as a host for the production of recombinant proteins. Vibriolysin is expressed as an inactive form in E. coli possibly due to the inhibitory effect of the N-terminal propeptide. In this study, we isolated the novel vibriolysin engineered by in vivo random mutagenesis, which is expressed as active mature vibriolysin in E. coli. The Western blot analysis showed that the N-terminal propeptide of the engineered enzyme was processed and degraded, confirming that the propeptide inhibits the mature enzyme. Two mutations located within the engineered vibriolysin resulted in the substitution of stop codon for Trp at position 11 in the signal peptide and of Val for Ala at position 183 in the N-terminal propeptide (where position 1 is defined as the first methionine). It was found that the individual mutations are related to the enzyme activity. The novel vibriolysin was extracellularly overproduced in BL21(DE3) and purified from the culture supernatant by ion-exchange chromatography followed by hydrophobic-interaction chromatography, resulting in an overall yield of 2.2mg/L of purified protein. This suggests that the novel engineered vibriolysin is useful for overproduction in an E. coli expression system.

journal_name

Protein Expr Purif

journal_title

Protein expression and purification

authors

Sonoda H,Sugimura A

doi

10.1016/j.pep.2008.08.001

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

153-9

issue

2

eissn

1046-5928

issn

1096-0279

pii

S1046-5928(08)00212-X

journal_volume

62

pub_type

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