The 57 conjugative Cit plasmids isolated from 72 citrate-utilizing (Cit+) Escherichia coli strains from various sources were classified into four groups on the basis of their genetic properties. Escherichia coli K12 strains carrying these Cit plasmids could utilize cis-aconitate or tricarballylate. in addition to citrate.
IshiguroN.,
SatoG.1979; The distribution of plasmids determining citrate utilization in citratepositive variants of Escherichia coli from humans, domestic animals, feral birds and environments. Journal of Hygiene 83:331–344
IshiguroN.,
SatoG.1980; Properties of a transmissible plasmid conferring citrate-utilizing ability in Escherichia coli of human origin. Journal of General Microbiology 116:553–556
IshiguroN.,
OkaC.,
SatoG.1978; Isolation of citrate-positive variants of Escherichia coli from domestic pigeons, pigs, cattle, and horses. Applied and Environmental Microbiology 36:217–222