Molecular and General Genetics MGG

, Volume 175, Issue 2, pp 159–174 | Cite as

Physical characterisation of the “Rac prophage” in E. coli K12

  • Kim Kaiser
  • Noreen E. Murray


We confirm the hypothesis of Low (1973) that many E. coli K 12 strains contain a prophage (the Rac prophage) located a few minutes clockwise of the trp operon on the genetic map. We have used restriction endonucleases and 32P-labelled probes to construct a physical map of this prophage. Some E. coli K 12 strains, including AB1157, have lost the entire prophage, apparently by a specific deletion. This is consistent with prophage excision by site-specific recombination.

λ reverse (λrev) phages (Zissler et al., 1971) are recombination proficient derivatives of phage λ in which the phage recombination functions have been replaced by analogous functions (RecE) derived from the host chromosome (Gottesman et al., 1974; Gillen et al., 1977). Our data support the origin of λrev phages by recombination between λ and the Rac prophage following excision of the Rac prophage from the E. coli chromosome.

Important experimental data are included in the Figure legends.


Experimental Data Recombination Restriction Endonuclease Figure Legend Physical Characterisation 
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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Kim Kaiser
    • 1
  • Noreen E. Murray
    • 1
  1. 1.Department of Molecular BiologyUniversity of EdinburghEdinburghScotland

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