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Microbiology and Biotechnology Letters

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Food Microbiology  |  Bioactive Compounds or Metabolites: Function and Application

Microbiol. Biotechnol. Lett.

Received: April 21, 2021; Revised: May 7, 2021

Cloning and expression of a fibrinolytic enzyme gene, aprECJ1, from Bacillus velezensis CJ1 isolated from Myeolchi Jeotgal

Ji Yeon Yoo 1, Zhuang Yao 1, Se Jin Lee 1, Hye Sung Jeon 1 and Jeong Hwan Kim 1, 2*

1Division of Applied Life Science (BK21 Four), Graduate School, 2Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Korea

Correspondence to :
Jeong Hwan Kim, E-mail : jeonghkm@gsnu.ac.kr

Abstract

Bacillus velezensis CJ1 showing strong fibrinolytic activity was isolated from Myeolchi Jeotgal, a popular Korean fermented seafood. When B. velezensis CJ1 was grown on 4 different culture media, culture on Luria-Bertani (LB) broth showed the highest fibrinolytic activity (102.94 mU/μl) at 48 h. LB was also the best medium for growth. SDS-PAGE of culture supernatant showed 4 major bands of 38, 35, 27, and 22 kDa in size. Fibrin zymography showed 4 active bands of 50, 47, 40, and 30 kDa in size. A gene homologous to aprE of Bacillus species was cloned by PCR. DNA sequencing showed that aprECJ1 can encode a protease consisting of 382 amino acids. The translated amino acid sequence of AprECJ1 showed high identity values with those of B. velezensis strains, and other Bacillus species. The aprECJ1 gene was introduced into B. subtilis WB600 using an E. coli-Bacillus shuttle vector, pHY300PLK, and overexpressed. A 27 kDa band corresponding to the mature form of AprECJ1 was produced and confirmed by SDS-PAGE and fibrin zymography. B. subtilis WB600 [pHYaprECJ1] showed 1.8 fold higher fibrinolytic activity than B. velezensis CJ1 at 48 h.

Keywords: Fibrinolytic enzyme, Bacillus velezensis, Myeolchi Jeotgal, gene expression

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