Incidence of lysogenic, colicinogenic and siderophore producer strains among human saprophytic Escherichia coli.

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Authors

ŠMARDA Jan ŠMAJS David HORYNOVÁ Sabina

Year of publication 2006
Type Article in Periodical
Magazine / Source Folia Microbiologica
MU Faculty or unit

Faculty of Medicine

Citation
Field Microbiology, virology
Keywords Escherichia coli; human intestinal strains; colicinogeny; lysogeny; siderophore
Description The current incidence of E. coli strains in healthy humans capable of producing the inhibitive exoproducts such as temperate bacteriophages, corpuscular or HMW (high molecular weight) and proteinaceous or LMW (low molecular weight) colicins and siderophores was studied. 53 Escherichia coli strains were collected from the colons of 53 healthy human volunteers in Brno, Czech Republic. The strains were then tested for spontaneous and induced production of inhibitive exoproducts in a cross-test against each other. Of the strains tested, 39.6% produced bacteriophages, 43.4% of strains produced from one to several LMW colicins. Only 5.7% of strains formed HMW colicins. And 15.1% of strains (eight strains) produced exocellular siderophores different from enterochelin. Of the eight strains, seven strains formed aerobactin and one strain formed an untyped siderophore. E. coli strains differ greatly in the incidence of colicinogeny and lysogeny from its closest systemic relatives in the genus Escherichia and therefore should not be regarded as a model bacterium in this respect.
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