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. 1972 Jan;109(1):416–422. doi: 10.1128/jb.109.1.416-422.1972

Naturally Occurring R Factor, Derepressed for Pilus Synthesis, Belonging to the Same Compatibility Group as the Sex Factor F of Escherichia coli K-12

Sheena Dennison a,1
PMCID: PMC247293  PMID: 4109889

Abstract

A naturally occurring R factor with constitutive pilus synthesis is described which resembles the sex factor F in compatibility and in restricting coliphage T7. Unlike F, it is not cured during growth with acridine orange. Results suggest that the R factor produces repressor of pilus synthesis, to which the operator is insensitive (i+oc). In this respect it differs from both the F factor (i−o+) and wild-type F-like R factors (i+o+).

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Selected References

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