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. 1976 May;126(2):646–653. doi: 10.1128/jb.126.2.646-653.1976

Methyl methane sulfonate-sensitive mutant of Escherichia coli deficient in an endonuclease specific for apurinic sites in deoxyribonucleic acid.

S Ljungquist, T Lindahl, P Howard-Flanders
PMCID: PMC233197  PMID: 177402

Abstract

A methyl methane sulfonate (MMS)-sensitive mutant of Escherichia coli AB 1157 was obtained by N-methyl-N'-nitro-N-nitrosoguanidine treatment. The mutant strain, AB 3027, is defective both in endonuclease activity for apurinic sites in deoxyribonucleic acid (DNA) and in DNA polymerase I, as shown by direct enzyme assays. Derivative strains, which retained the deficiency in endonuclease activity for apurinic sties (approximately 10% of the wild-type enzyme level) but had normal DNA polymerase I activity, were obtained by P1-mediated transduction (strain NH5016) or by selection of revertants to decreased MMS sensitivity. These endonuclease-deficient strains are more MMS-sensitive than wild-type strains. Revertants of these deficients strains to normal MMS resistance were isolated. They had increased levels of the endonuclease activity but did not attain wild-type levels. The data suggest that endonuclease for apurinic sites is active in repair of lesions introduced in DNA as a consequence of MMS treatment. Two different endonucleases that specifically attack DNA containing apurinic sites arepresented in E coli K-12. A heat-labile activity, sensitive to inhibition by ethylenediaminetetraacetate, accounts for 90% of the total endonuclease activity for apurinic sties in crude cell extracts. The residual 10% is due to a more heat-resistant activity, refractory to ethylenediaminetetraacetate inhibition. The AB3027 and NH5016 strains have normal amounts of the latter endonuclease but no or very little of the former activity.

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Selected References

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