Characterization of Endolysin LysECP26 Derived from
rV5-like Phage vB_EcoM-ECP26 for Inactivation of
Escherichia coli O157:H7.
J Microbiol Biotechnol 2020;
30:1552-1558. [PMID:
32699198 PMCID:
PMC9728275 DOI:
10.4014/jmb.2005.05030]
[Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 07/13/2020] [Accepted: 07/14/2020] [Indexed: 12/15/2022]
Abstract
With an increase in the consumption of non-heated fresh food, foodborne shiga toxin-producing Escherichia coli (STEC) has emerged as one of the most problematic pathogens worldwide. Endolysin, a bacteriophage-derived lysis protein, is able to lyse the target bacteria without any special resistance, and thus has been garnering interest as a powerful antimicrobial agent. In this study, rV5-like phage endolysin targeting E. coli O157:H7, named as LysECP26, was identified and purified. This endolysin had a lysozyme-like catalytic domain, but differed markedly from the sequence of lambda phage endolysin. LysECP26 exhibited strong activity with a broad lytic spectrum against various gram-negative strains (29/29) and was relatively stable at a broad temperature range (4°C- 55°C). The optimum temperature and pH ranges of LysECP26 were identified at 37°C-42°C and pH 7- 8, respectively. NaCl supplementation did not affect the lytic activity. Although LysECP26 was limited in that it could not pass the outer membrane, E. coli O157: H7 could be effectively controlled by adding ethylenediaminetetraacetic acid (EDTA) and citric acid (1.44 and 1.14 log CFU/ml) within 30 min. Therefore, LysECP26 may serv as an effective biocontrol agent for gram-negative pathogens, including E. coli O157:H7.
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