Summary: The bacterial drug resistance plasmids R711b and R778b, 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. However, 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 F are similar to 711 pili in their phage adsorption properties, but they are serologically different, as are F pili. It is concluded that F, F and 711 pili have basic differences in spite of a morphological resemblance.


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