Compatibility of the F-like plasmid FB1drd with standard F-group plasmids in E. coli K12 strains]

Compatibility of depressed F-like plasmid FB1drd integrated into E. coli K12 cell chromosome with standard plasmids of FI-FVI compatibility groups was studied. The results obtained show that such plasmids can stably coexist in the same cell with plasmid FB1drd. On these grounds it is supposed that the latter belongs to the new compatibility group (FVII).