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

Publisher Website
Google Scholar
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+).