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Sex pili and common pili in the conjugational transfer of colicin factor Ib by Salmonella typhimurium

Published online by Cambridge University Press:  14 April 2009

G. G. Meynell  and
A. M. Lawn
G. G. Meynell
Affiliation:
Guinness-Lister Research Unit
A. M. Lawn
Affiliation:
Department of Electron Microscopy, Lister Institute of Preventive Medicine, Chelsea Bridge Road, London, S.W.1

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The kinetics of spread of colicin factor Ib (colIb) in col− cultures of S. typhimurium was studied. The rate of spread was greater with pil+ strains (those forming common pili) than with pil− strains. The difference reflects inefficient pairing between pil− cells, which donate or receive colIb efficiently only when mated with pil+ cells. The donor function of colIb is known to be repressed a few generations after it is acquired by a col− cell. While donor ability is manifest, a new type of pilus (the ‘Ib pilus’) is formed which is morphologically distinct from common pili and other sex pili such as that determined by the F factor. The Ib pilus is presumably involved in the transfer of colIb by conjugation.

Type
Research Article
Information
Genetics Research , Volume 9 , Issue 3 , June 1967 , pp. 359 - 367
Copyright
Copyright © Cambridge University Press 1967

References

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