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Xeroderma Pigmentosum Fibroblasts of the D Group Lack an Apurinic DNA Endonuclease Species with a Low Apparent Km

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Specialty Biochemistry
Date 1978 Mar 1
PMID 643622
Citations 17
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Abstract

Apurinic DNA endonuclease activity from cultured human fibroblasts was resolved into two species by phosphocellulose chromatography. The species had sedimentation coefficients of 3.3 S and 2.8 S and apparent Km's for apurinic sites of 5 and 44 nM, respectively. The low Km species was absent from extracts of cell lines XP5BE, XP6BE and XP7BE of xeroderma pigmentosum complementation group D.

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