Properties of a transmissible plasmid conferring citrate-utilizing ability in Escherichia coli of human origin.

Transfer of citrate utilization (Cit+) was achieved with a plasmid (pCIT354) which is Fi+, has F-like pili and fails to inhibit phage propagation. Transduction of Cit+ was achieved with P1 hage. Results of incompatibility tests with R plasmids indicated that pCIT354 is a self-repressed F-like plasmid.