Characterization of Pili Determined by Drug Resistance Plasmids R711b and R778b

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Abstract
The bacterial drug resistance plasmids R711b and R778b [from Escherichia coli and Salmonella typhimurium], at present classified in the X incompatibility group, determine pili (designated 711) that resemble F pili morphologically. Like F pili, 711 pili adsorb F-specific filamentous bacteriophages to their tips, though more often in pairs, than singly. F-specific RNA-containing bacteriophages are not adsorbed to their sides, and strains carrying the plasmids are resistant to these phages. Pili determined by the only IncFV plasmid F0lac are similar to 711 pili in their phage adsorption properties, but they are serologically different, as are F pili. F, F0lac and 711 pili have basic differences in spite of a morphological resemblance.