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Volume 158, Issue 6

Characterization of a phage-like pyocin from the plant growth-promoting rhizobacterium SF4c Free

Abstract

R-type and F-type pyocins are high-molecular-mass bacteriocins produced by that resemble bacteriophage tails. They contain no head structures and no DNA, and are used as defence systems. In this report, we show that SF4c, a strain isolated from the wheat rhizosphere, produces a high-molecular-mass bacteriocin which inhibits the growth of closely related bacteria. A mutant deficient in production of this antimicrobial compound was obtained by transposon mutagenesis. Sequence analysis revealed that the transposon had disrupted a gene that we have named , since it is homologous to that encoding phage tape-measure protein in Pf0-1, a gene belonging to a prophage similar to phage-like pyocin from PAO1. In addition, we have identified genes from the SF4c pyocin cluster that encode a lytic system and regulatory genes. We constructed a non-polar mutant of SF4c. Heterologous complementation of this mutation restored the production of bacteriocin. Real-time PCR was used to analyse the expression of pyocin under different stress conditions. Bacteriocin was upregulated by mitomycin C, UV light and hydrogen peroxide, and was downregulated by saline stress. This report constitutes, to our knowledge, the first genetic characterization of a phage tail-like bacteriocin in a rhizosphere strain.

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2012-06-01
2024-04-24
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Characterization of a phage-like pyocin from the plant growth-promoting rhizobacterium Pseudomonas fluorescens SF4c
Microbiology 158, 1493 (2012); https://doi.org/10.1099/mic.0.056002-0
/content/journal/micro/10.1099/mic.0.056002-0
/content/journal/micro/10.1099/mic.0.056002-0
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