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J Bacteriol. 1974 June; 118(3): 778-782
Copyright © 1974 American Society for Microbiology. All Rights Reserved.

Mapping Loci for Surface Exclusion and Incompatibility on the F Factor of Escherichia coli K-12

MRC Molecular Genetics Unit, Department of Molecular Biology, University of Edinburgh, Edinburgh EH9 3JR, Scotland

ABSTRACT

A series of Hfr deletion strains carrying deletions extending different distances into the integrated F factor have been used to map loci for surface exclusion (traS) and for incompatibility (inc) on the Escherichia coli K-12 sex factor F. traS mapped between traG and traD. It forms a part of the large operon, including all the known transfer genes except traJ, and is co-controlled with these. The product of traS is not required for formation of the F pilus. inc mapped between the ^R₁₁ locus and the origin of transfer; it is therefore one of the earliest loci transferred during conjugation.