Genetic locus determining resistance to phage BF23 and colicins E1, E2and E3inEscherichia coli

Abstract
The gene for resistance to phage BF23 and colicins E1, E2 and E3, bfe, was mapped by a combination of conjugation and transduction crosses. Co-transduction of bfe was found with markers in the region between 76 and 79 min on the Escherichia coli genetic map. The highest frequency of co-transduction was found with argH (47%). Three-factor transductional crosses showed unambiguously that bfe lies between argH and supM, at about 77·5 min on the map.