Biotechnology Bulletin ›› 2019, Vol. 35 ›› Issue (2): 109-115.doi: 10.13560/j.cnki.biotech.bull.1985.2018-0611

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Eukaryotic Expression of Antibacterial Peptide Domesticin from Musca domestica in Pichia Pastoris and Antibacterial Activity Identification

LIU Jin-lan, YANG Xue, LI Shuang-shuang, ZHANG Yu-ming, LIU Feng-song, TANG Ting, LI Hong-quan   

  1. Hebei University,Baoding 071000
  • Received:2018-07-04 Online:2019-02-26 Published:2019-03-07

Abstract: This work aims to express the Musca domestica antibacterial peptide Domesticin gene domesticin in Pichia pastoris and determine the antibacterial activity of the expressed product. The cloned domesticin gene fragment was ligated to pPIC9K vector to construct a recombinant expression vector pPIC9K-domesticin,which was transformed into competent Pichia pastoris KM71. Recombinant fusion protein Domesticin was induced with methanol,the expressed product was identified by Tricine-SDS-PAGE and Western Blot,and antibacterial activity was determined by minimal inhibitory concentration. The results indicated that antibacterial peptide Domesticin was successfully expressed in P. pastoris,and Domesticin demonstrated antibacterial activity against many kinds of bacteria. Domesticin is a novel broad spectrum antibacterial peptide that has antibacterial activity against both Gram-positive bacteria and Gram-negative bacteria,which has the capacity to be a new generation antimicrobial agent.

Key words: Musca domestica, antibacterial peptide, Pichia pastoris, eukaryotic expression, antibacterial activity