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Plasmid-Associated Functions of a Stable Flac

Several functions associated with the stable plasmid, FlacS, have been examined. Our results indicate that the sex pili synthesized by Escherichia coli strains carrying FlacS are altered in some manner as evidenced by a very inefficient adsorption of male-specific phages. On the other hand, FlacS-mediated entry exclusion of related plasmids and plasmid incompatibility function(s) appear normal. The presence of covalently closed circular deoxyribonucleic acid in E. coli strains harboring FlacS indicates that it is an autonomously replicating plasmid. Based on β-galactosidase levels and the percentage of covalently closed circular deoxyribonucleic acid, it appears that the stability of the FlacS is not the result of multiple copies of this plasmid. FlacS appears larger than its precursor, Fts114lac, in sedimentation through alkaline sucrose gradients.