XRCC1 Coordinates the Initial and Late Stages of DNA Abasic Site Repair Through Protein-protein Interactions

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 2001 Nov 15

PMID 11707423

Citations 188

Authors

A E Vidal

S Boiteux

I D Hickson

J P Radicella

Affiliations

Soon will be listed here.

Abstract

The major human AP endonuclease APE1 (HAP1, APEX, Ref1) initiates the repair of abasic sites generated either spontaneously, from attack of bases by free radicals, or during the course of the repair of damaged bases. APE1 therefore plays a central role in the base excision repair (BER) pathway. We report here that XRCC1, another essential protein involved in the maintenance of genome stability, physically interacts with APE1 and stimulates its enzymatic activities. A truncated form of APE1, lacking the first 35 amino acids, although catalytically proficient, loses the affinity for XRCC1 and is not stimulated by XRCC1. Chinese ovary cell lines mutated in XRCC1 have a diminished capacity to initiate the repair of AP sites. This defect is compensated by the expression of XRCC1. XRCC1, acting as both a scaffold and a modulator of the different activities involved in BER, would provide a physical link between the incision and sealing steps of the AP site repair process. The interaction described extends the coordinating role of XRCC1 to the initial step of the repair of DNA abasic sites.

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