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PubMed1975

[Role of DNA-membrane attachment in repair of radiation damage in Micrococcus radiodurans].

The unirradiated bacterial DNA assciated with the membrane is liberated into the cytoplasm after breakage of either a single or a double strand, resulting from X-ray action. During the reincubation period in growth-medium, the DNA is reassociated with the membrane. This phenomenon is very rapid and occurs without increasing the molecular weight of DNA. The study of DNA-membrane complexes shows that the size of the DNA-associated membranous fragment differs according to the lysing technique employed, appearing as a change in the density of the complex. Chloramphenicol decreases reassociation, and iodoacetamide, a radiosensititzing agent, inhibits it completely.

Acetamides↗
PubMed1984

Adaptive response of Micrococcus luteus to alkylating chemicals.

Wild type M. luteus cells have been adapted by a step-wise treatment with sub-lethal concentrations of MNNG. The adapted cells exhibit 5.7 fold increased resistance to the killing effects of the mutagen and a simultaneous efficient removal of various base modifications present in cellular DNA. A protein extract prepared from adapted cells contains inducible repair functions which can reduce 80-90% of the alkylated DNA content of 06-MeG is effected by a transmethylase and there is no concomitant release of the modified base. However, N-3 MeG is released as a free modified base through the action of a DNA glycosylase. The release of N-3 MeA is unaffected by the induction treatment whereas that of N-7 methylpurine is slightly improved in the adapted cells.

Alkylating Agents↗