Conjugation in Escherichia coli K-12 and its modification by irradiation

Biophysical Journal
T H Wood, R H Walmsley

Abstract

The steps of normal bacterial conjugation (union, transfer, integration and segregation) are described in analytical terms. Only two parameters are utilized: nu(mt) (0), the probability of interruption of transfer of the male chromosome per unit chromosomal distance; and nu(r) (0), the probability per unit chromosomal distance of a recombinational event. Experimentally these two parameters have the same value (0.06 min(-1) or 10(-6) per nucleotide pair). Irradiation of the donor parent prior to mating increases the transfer parameter (nu(mt) = nu(mt) (0) + sigma(mt)D) and a complete description of the radiation response of recombinant production is obtained by a consideration of the single parameter sigma(mt). Irradiation of the recipient parent prior to mating increases the recombination parameter (nu(r) = nu(r) (0) + sigma(r)D) and a complete description of the radiation response of recombinant production is obtained by the addition of the parameter sigma(r). Experimentally sigma(mt) and sigma(r) are found to have the same value, approximately 0.004 krad(-1) min(-1) for X-irradiation. It is thus possible to describe mathematically the behavior of the unperturbed mating system by a single parameter nu(0); a single additional p...Continue Reading

Citations

Feb 1, 1980·Molecular & General Genetics : MGG·S E BreslerV A Lanzov
Mar 7, 1979·Journal of Theoretical Biology·S E Dromashko, N A Troitsky
Nov 9, 1978·Molecular & General Genetics : MGG·S E BreslerV A Lanzov
Sep 1, 1970·Journal of Bacteriology·M WannT H Wood

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