[Mutation in the cspH-cspG gene cluster enhances expression of heat-shock proteins and SOS repair system of Escherichia coli].

The recessive radioresistance allele gam12 cloned in plasmid pBC4042-gam12 slightly increases the radiation resistance of Escherichia coli wild-type cells. Meanwhile, irradiation by gamma-rays induces transition of r12 mutation to the homozygous state and causes a 3.37-fold increase in radiation resistance of these cells.