The Human Oxidative DNA Glycosylase NEIL1 Excises Psoralen-induced Interstrand DNA Cross-links in a Three-stranded DNA Structure

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2009 Mar 5

PMID 19258314

Citations 35

Authors

Sophie Couve

Gaetane Mace-Aime

Filippo Rosselli

Murat K Saparbaev

Affiliations

Soon will be listed here.

Abstract

Previously, we have demonstrated that human oxidative DNA glycosylase NEIL1 excises photoactivated psoralen-induced monoadducts but not genuine interstrand cross-links (ICLs) in duplex DNA. It has been postulated that the repair of ICLs in mammalian cells is mainly linked to DNA replication and proceeds via dual incisions in one DNA strand that bracket the cross-linked site. This process, known as "unhooking," enables strand separation and translesion DNA synthesis through the gap, yielding a three-stranded DNA repair intermediate composed of a short unhooked oligomer covalently bound to the duplex. At present, the detailed molecular mechanism of ICL repair in mammalian cells remains unclear. Here, we constructed and characterized three-stranded DNA structures containing a single ICL as substrates for the base excision repair proteins. We show that NEIL1 excises with high efficiency the unhooked ICL fragment within a three-stranded DNA structure. Complete reconstitution of the repair of unhooked ICL shows that it can be processed in a short patch base excision repair pathway. The new substrate specificity of NEIL1 points to a preferential involvement in the replication-associated repair of ICLs. Based on these data, we propose a model for the mechanism of ICL repair in mammalian cells that implicates the DNA glycosylase activity of NEIL1 downstream of Xeroderma Pigmentosum group F/Excision Repair Cross-Complementing 1 endonuclease complex (XPF/ERCC1) and translesion DNA synthesis repair steps. Finally, our data demonstrate that Nei-like proteins from Escherichia coli to human cells can excise bulky unhooked psoralen-induced ICLs via hydrolysis of glycosidic bond between cross-linked base and deoxyribose sugar, thus providing an alternative heuristic solution for the removal of complex DNA lesions.

Citing Articles

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NEIL3-mediated proteasomal degradation facilitates the repair of cisplatin-induced DNA damage in human cells.

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