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. 1979 Jun 25;6(8):2901–2917. doi: 10.1093/nar/6.8.2901

Apurinic acid endonuclease activity from mouse epidermal cells.

G Ludwig, H W Thielmann
PMCID: PMC327901  PMID: 111231

Abstract

An endonuclease activity making single-strand breaks into depurinated and alkylated DNA has been purified 500-fold from carcinogen-transformed mouse epidermal cells. The enzyme was active only at apurinic/apyrimidinic sites, regardless of whether they were produced by heating at an acidic pH or by alkylation with the ultimate carcinogen MeSO2OMe. The enzyme did not act on native DNA nor on ultraviolet-induced pyrimidine-dimers nor on steric distortions caused by modification of DNA with the carcinogen (Ac)2ONFln. The enzyme was active in the presence of 1 mM EDTA; however, at pH 7.4 optimal conditions were: 6mM MgCl2 and 40--120 mM KCl or 10--40 mM potassium phosphate. The enzyme eluted from hydroxyapatite, phosphocellulose and heparin-cellulose between 100--250 mM potassium phosphate but did not bind to DEAE-cellulose. Using four chromatographic steps the endonuclease was obtained free of exonuclease, demethylase and DNA glycosylase activity specific for DNA bases methylated with MeSO2OMe or MeNOUr. The molecular weight was 31 000 +/- 3000 as calculated from the diffusion coefficient (8.2 x 10-7 cm2/s) and the sedimentation value (2.7 S).

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Selected References

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