Bacillus phage endolysin, lys46, bactericidal properties against Gram-negative bacteria

  • Mohammad Reza Sarjoughian Department of Biotechnology, Faculty of New Sciences and Technologies, Semnan University, Semnan, Iran
  • Fereshte Rahmani Department of Biotechnology, Faculty of New Sciences and Technologies, Semnan University, Semnan, Iran
  • Shamsozoha Abolmaali Department of Biology, Faculty of Basic Science, Semnan University, Semnan, Iran
  • Shakiba Darvish Alipour Astaneh Mail Department of Biotechnology, Faculty of New Sciences and Technologies, Semnan University, Semnan, Iran
Keywords:
Antibacterial activity, Bacteriophage SPP1, Endolysin, Siphoviridea

Abstract

Background and objective: The great potential of bacteriophage for removing pathogen bacteria via targeting the cell wall is highly concerned. With a priority for drug-resistant, we screened endolysins  targeting Gram-negative bacteria to introduce a new antibacterial agent. The study was aimed to identify endolysins from the lysogenic phage of the Siphoviridea family in Bacillus subtilis.
Materials and Methods: The Bacillus subtilis strain DDBCC46 was isolated from a preliminary antibacterial screening program. The endolysin(s) was extracted, concentrated with ammonium sulfate saturation, and their activity evaluated against the indicator bacteria. The phage particles was extracted from the bacteria using the minimum inhibition concentration of mitomycin C, followed by testing the phage inhibitory effect on the growth of indicator bacteria. The NCBI, Virus-Host DB, and EXPASY databases were used to obtain and confirm the sequences of the genes encoding PG hydrolases in Siphoviridea phages hosted in B. subtilis.
Results: An  816 bp gene encoding an endolysin enzyme, was approved in the B. subtilis, DDBCC 46, with specific primers of Bacillus phage SPP1. The purified-endolysin indicated antibacterial activity against Klebsiella pneumoniae, Salmonella typhimurium, Proteus (sp), and Escherichia coli. SDS-PAGE profiling followed by silica gel purification, led to introduce lys4630 as a therapeutic product and food preservative.
Conclusion: lys4630 showed specific effects on the very known gram-negative pathogens in clinics and food industries; E. coli, P. aeruginosa, Salmonella (sp).

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Published
2020-12-16
How to Cite
1.
Sarjoughian MR, Rahmani F, Abolmaali S, Darvish Alipour Astaneh S. Bacillus phage endolysin, lys46, bactericidal properties against Gram-negative bacteria. Iran J Microbiol. 12(6):607-615.
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