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Insertion of the F Factor into the Cluster of rfa (Rough A) Genes of Salmonella typhimurium

^a Department of Biology, University of Calgary, Calgary 44, Alberta, Canada

ABSTRACT

From F⁺ strains of Salmonella typhimurium, isolates were obtained representing two new classes of Hfr strains, HfrK1 and HfrK2, in which the insertion of the F factor into the rfa genes results in chromosome mobilization either clockwise or anticlockwise from rfa, and in the Rfa phenotype. The point of insertion of the F factor into the cluster of rfa genes, revealed by studies of the early transfer of their normal alleles, is as follows: xyl-cysE-rfa-657 (HfrK2-1, SA540 )–( HfrK1-1, SA458)–rfaG-( HfrK1-2, SA464)–pyrE-metA

¹ Present address: Cholera Research Laboratory, P.O. Box 128, Dacca, Bangladesh.