Molecular and General Genetics MGG

, Volume 186, Issue 2, pp 298–300

Plasmid pKM101-mediated mutagenesis in Escherichia coli is inducible

  • Zygmunt Cieśla
Short Communication


A tif-1 umuC36 double mutant of Escherichia coli was constructed. It has been found that the umuC36 mutation prevents both increased spontaneous mutagenesis and enhanced reactivation of UV-irradiated λ, phenomena normally observed in the tif-1 strain grown at 42°C. When the plasmid pKM101 was introduced into tif-1 umuC36, an elevated spontaneous reversion rate of the his-4 mutation observed at 30°C was further increased 6-fold at 42°C. This was accompanied by a 10-fold increase in the ability of tif-1umuC36 containing pKM101 and grown before infection at 42°C to reactivate UV-irradiated λ.


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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Zygmunt Cieśla
    • 1
  1. 1.Institute of Biochemistry and BiophysicsPolish Academy of SciencesWarsawPoland

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