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The R21 (TC) factor, obtained by transduction of the R10 (TC.CM.SM.SA) factor with phage ε to group ESalmonella , is not transferable by the normal conjugal process. However, when R21 (TC)+ transductants are infected with the F13 factor, the nontransferable R21 (TC) factor acquires transmissibility by conjugation. R21 (TC)+ conjugants ofEscherichia coli K-12, to which only the R21 (TC) factor was transmitted by cell-to-cell contact from an F′ R+ donor, were still unable to transfer their R21 (TC) factor by conjugation. In crosses between Hfr and F− E. coli K-12 strains containing R21 (TC), the gene responsible for tetracycline resistance was located on theE. coli K-12 chromosome betweenlac andpro , nearlac .

Drug Resistance of Enteric Bacteria VIII. Chromosomal Location of Nontransferable R Factor inEscherichia coli