[Features of expression of the genetic region of plasmid pAP42, controlling the synthesis of "sex" pili and surface exclusion system in various E. coli cells]. / Osobennosti ékspressii geneticheskoi oblasti plazmidy pAP42, kontroliruiushchei sintez "polovykh" pilei i sistemu poverkhnostnogo iskliucheniia, v raznykh kletkakh E. coli.

ABSTRACT

The results of investigation of serologically--typed and nontyped E. coli cells carrying F-like derepressed plasmid pAP42 testified to the influence of genome of some bacterial hosts on the expression of plasmid genetic region determining "sex" (plasmid--specific) pili synthesis and surface exclusion system (Sfx--system). Similar changes in bacterial cells phenotype can also result from the mutational changes of this plasmid.