Abstract:
Antimicrobial peptides (AMPs) are small molecules of the important component of the natural defense system against microbial invasion. AMPs show broad spectrum antimicrobial activities against bacteria, fungi and virus. They are attractive candidates for food preservatives from natural sources. In previous study, the bactenecin-likeSp (bacSp) antimicrobial peptide was report from the hemocyte of mud crab, Scylla paramamosain. The bacSp showed strong antimicrobial activities against microorganisms. The objective of this study is to express and purify the recombinant bacSp and to investigate the biological activity and its antimicrobial activity of recombinant bacSp. As a result, a high level of recombinant bacSp expression after induction with 1 mM IPTG was 18 hour. It was found that the recombinant bacSp formed inclusion bodies. The insoluble protein was then solubilized with 8 M urea and purified using Ni2+-NTA affinity chromatography. SDS-PAGE analysis of the purified recombinant bacSp revealed a single protein band, had a molecular weight approximate 5,000 Da. The purified recombinant bacSp and synthetic peptide showed antimicrobial activity against Vibrio parahaemolyticus. The antimicrobial peptide bacSp exhibited heat stability up to 121 °C for 15 minutes and activity at pH range from 6.5 to 9.