AP endonuclease 1 has no biologically significant 3(')-->5(')-exonuclease activity.

Abstract:

:The 3(')-->5(')-exonucleolytic activity of human apurinic/apyrimidinic endonuclease 1 (APE1) on mispaired DNA at the 3(')-termini of recessed, nicked or gapped DNA molecules was analyzed and compared with the primary endonucleolytic activity. We found that under reaction conditions optimal for AP endonuclease activity the 3(')-->5(')-exonuclease activity of APE1 manifests only at enzyme concentration elevated by 6-7 orders of magnitude. This activity does not show a preference to mismatched compared to matched DNA structures as well as to nicked or gapped DNA substrates in comparison to recessed ones. Therefore, the 3(')-->5(')-exonuclease activity associated with APE1 can hardly be considered as key mechanism that improves fidelity of DNA repair.

authors

Lebedeva NA,Khodyreva SN,Favre A,Lavrik OI

doi

10.1016/s0006-291x(02)02808-5

subject

Has Abstract

pub_date

2003-01-03 00:00:00

pages

182-7

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006291X02028085

journal_volume

300

pub_type

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