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The kinetics of transfer of nonconjugative plasmids by mobilizing conjugative factors

Published online by Cambridge University Press:  14 April 2009

Bruce R. Levin  and
Virginia A. Rice
Bruce R. Levin
Affiliation:
Department of Zoology, University of Massachusetts, Amherst, Massachusetts 01003
Virginia A. Rice
Affiliation:
Department of Zoology, University of Massachusetts, Amherst, Massachusetts 01003

Summary

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A mathematical model for the kinetics of transfer of non-selftransmissible (nonconjugative) plasmids by mobilizing conjugative factors is presented and methods to estimate its parameters described. Using batch and chemostat cultures of Escherichia coli K-12 with the nonconjugative plasmid pCR1 and an F′ mobilizing factor, the parameters of this model were estimated. The observed changes in concentrations of the different parental and transconjugant cell types and the changes in these concentrations anticipated from the model are presented for two different ‘mating’ combinations in both exponentially growing and equilibrium chemostat populations of E. coli. The results of these experiments are interpreted to suggest that for bacterial populations dividing at a constant rate in liquid culture, the kinetics of mobilization transfer of nonconjugative plasmids can be reasonably well described by a simple set of mass action differential equations. These results also suggest that the carriage of the nonconjugative plasmid pCR1 has little, if any, effect on the capacity of a host bacterium to donate or receive conjugative F′ plasmids.

Type
Research Article
Information
Genetics Research , Volume 35 , Issue 3 , June 1980 , pp. 241 - 259
Copyright
Copyright © Cambridge University Press 1980

References

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