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. 1990 Jun;87(11):4193–4197. doi: 10.1073/pnas.87.11.4193

Yeast structural gene (APN1) for the major apurinic endonuclease: homology to Escherichia coli endonuclease IV.

S C Popoff 1, A I Spira 1, A W Johnson 1, B Demple 1
PMCID: PMC54074  PMID: 1693433

Abstract

DNA damage generated by oxygen radicals includes base-free apurinic/apyrimidinic (AP) sites and strand breaks that bear deoxyribose fragments. The yeast Saccharomyces cerevisiae repairs such DNA lesions by using a single major enzyme. We have cloned the yeast structural gene (APN1) encoding this AP endonuclease/3'-repair diesterase by immunological screening of a yeast genomic DNA expression library in lambda gt11. Gene disruption experiments confirm that the Apn1 protein accounts for greater than or equal to 97% of both AP endonuclease and DNA 3'-repair diesterase activities in yeast cell-free extracts. The DNA and predicted amino acid sequences for the APN1 gene are homologous to those for the nfo gene encoding DNA endonuclease IV of Escherichia coli. This conservation of structure between a eukaryotic enzyme and its prokaryotic counterpart underscores the fundamental nature of their roles in DNA repair.

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Selected References

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