Abstract
The current incidence ofEscherichia coli strains in healthy humans capable of producing the inhibitory exoproducts, such as temperate bacteriophages, corpuscular or HMW (high-molar mass) and proteinaceous or LMW (low-molar mass) colicins and siderophores was determined. Fifty-threeE. coli strains were collected from the colons of 53 healthy human volunteers in Brno (Czechia) and tested for spontaneous and induced production of inhibitory exoproducts in a cross-test against each other. Of the strains tested, 37.7% produced bacteriophages, 41.5% produced from one to several LMW colicins, 11.3% formed HMW colicins and 15.1% (eight strains) produced exocellular siderophores different from enterochelin. Of these, 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 genusEscherichia and therefore should not be regarded as a model bacterium in this respect.
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This work was supported by grants from theGrant Agency of the Czech Republic (310/01/0013 and 310/03/1091) and by the institutional support of theMinistry of Education, Youth and Sports of the Czech Republic (MŠM 002 162 2415).
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Šmarda, J., Šmajs, D. & Horynová, S. Incidence of lysogenic, colicinogenic and siderophore-producing strains among human non-pathogenicEscherichia coli . Folia Microbiol 51, 387–391 (2006). https://doi.org/10.1007/BF02931581
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DOI: https://doi.org/10.1007/BF02931581