The major human AP endonuclease (Ape1) is involved in the nucleotide incision repair pathway.

2.50
Hdl Handle:
http://hdl.handle.net/10541/78479
Title:
The major human AP endonuclease (Ape1) is involved in the nucleotide incision repair pathway.
Authors:
Gros, Laurent; Ishchenko, Alexander A; Ide, Hiroshi; Elder, Rhoderick H; Saparbaev, Murat K
Abstract:
In nucleotide incision repair (NIR), an endonuclease nicks oxidatively damaged DNA in a DNA glycosylase-independent manner, providing the correct ends for DNA synthesis coupled to the repair of the remaining 5'-dangling modified nucleotide. This mechanistic feature is distinct from DNA glycosylase-mediated base excision repair. Here we report that Ape1, the major apurinic/apyrimidinic endonuclease in human cells, is the damage- specific endonuclease involved in NIR. We show that Ape1 incises DNA containing 5,6-dihydro-2'-deoxyuridine, 5,6-dihydrothymidine, 5-hydroxy-2'-deoxyuridine, alpha-2'-deoxyadenosine and alpha-thymidine adducts, generating 3'-hydroxyl and 5'-phosphate termini. The kinetic constants indicate that Ape1-catalysed NIR activity is highly efficient. The substrate specificity and protein conformation of Ape1 is modulated by MgCl2 concentrations, thus providing conditions under which NIR becomes a major activity in cell-free extracts. While the N-terminal region of Ape1 is not required for AP endonuclease function, we show that it regulates the NIR activity. The physiological relevance of the mammalian NIR pathway is discussed.
Affiliation:
Groupe Réparation de l'ADN', UMR 8113 CNRS, LBPA-ENS Cachan, Institut Gustave Roussy, 39, rue Camille Desmoulins, 94805 Villejuif Cedex, France.
Citation:
The major human AP endonuclease (Ape1) is involved in the nucleotide incision repair pathway. 2004, 32 (1):73-81 Nucleic Acids Res.
Journal:
Nucleic Acids Research
Issue Date:
2004
URI:
http://hdl.handle.net/10541/78479
DOI:
10.1093/nar/gkh165
PubMed ID:
14704345
Type:
Article
Language:
en
ISSN:
1362-4962
Appears in Collections:
All Paterson Institute for Cancer Research

Full metadata record

DC FieldValue Language
dc.contributor.authorGros, Laurent-
dc.contributor.authorIshchenko, Alexander A-
dc.contributor.authorIde, Hiroshi-
dc.contributor.authorElder, Rhoderick H-
dc.contributor.authorSaparbaev, Murat K-
dc.date.accessioned2009-08-25T11:54:06Z-
dc.date.available2009-08-25T11:54:06Z-
dc.date.issued2004-
dc.identifier.citationThe major human AP endonuclease (Ape1) is involved in the nucleotide incision repair pathway. 2004, 32 (1):73-81 Nucleic Acids Res.en
dc.identifier.issn1362-4962-
dc.identifier.pmid14704345-
dc.identifier.doi10.1093/nar/gkh165-
dc.identifier.urihttp://hdl.handle.net/10541/78479-
dc.description.abstractIn nucleotide incision repair (NIR), an endonuclease nicks oxidatively damaged DNA in a DNA glycosylase-independent manner, providing the correct ends for DNA synthesis coupled to the repair of the remaining 5'-dangling modified nucleotide. This mechanistic feature is distinct from DNA glycosylase-mediated base excision repair. Here we report that Ape1, the major apurinic/apyrimidinic endonuclease in human cells, is the damage- specific endonuclease involved in NIR. We show that Ape1 incises DNA containing 5,6-dihydro-2'-deoxyuridine, 5,6-dihydrothymidine, 5-hydroxy-2'-deoxyuridine, alpha-2'-deoxyadenosine and alpha-thymidine adducts, generating 3'-hydroxyl and 5'-phosphate termini. The kinetic constants indicate that Ape1-catalysed NIR activity is highly efficient. The substrate specificity and protein conformation of Ape1 is modulated by MgCl2 concentrations, thus providing conditions under which NIR becomes a major activity in cell-free extracts. While the N-terminal region of Ape1 is not required for AP endonuclease function, we show that it regulates the NIR activity. The physiological relevance of the mammalian NIR pathway is discussed.en
dc.language.isoenen
dc.subject.meshCell Extracts-
dc.subject.meshDNA Damage-
dc.subject.meshDNA Repair-
dc.subject.meshDNA-(Apurinic or Apyrimidinic Site) Lyase-
dc.subject.meshHela Cells-
dc.subject.meshHumans-
dc.subject.meshKinetics-
dc.subject.meshMagnesium-
dc.subject.meshNucleotides-
dc.subject.meshOligodeoxyribonucleotides-
dc.subject.meshOxidation-Reduction-
dc.subject.meshProtein Conformation-
dc.subject.meshSubstrate Specificity-
dc.titleThe major human AP endonuclease (Ape1) is involved in the nucleotide incision repair pathway.en
dc.typeArticleen
dc.contributor.departmentGroupe Réparation de l'ADN', UMR 8113 CNRS, LBPA-ENS Cachan, Institut Gustave Roussy, 39, rue Camille Desmoulins, 94805 Villejuif Cedex, France.en
dc.identifier.journalNucleic Acids Researchen

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