Strand-specific binding of RPA and XPA to damaged duplex DNA

Ingrid L. Hermanson-Miller, John J. Turchi

Research output: Contribution to journalArticle

56 Scopus citations

Abstract

The nucleotide excision repair (NER) pathway is a major pathway used to repair bulky adduct DNA damage. Two proteins, xeroderma pigmentosum group A protein (XPA) and replication protein A (RPA), have been implicated in the role of DNA damage recognition in the NER pathway. The particular manner in which these two damage recognition proteins align themselves with respect to a damaged DNA site was assessed using photoreactive base analogues within specific DNA substrates to allow site-specific cross-linking of the damage recognition proteins. Results of these studies demonstrate that both RPA and XPA are in close proximity to the adduct as measured by cross-linking of each protein directly to the platinum moiety. Additional studies demonstrate that XPA contacts both the damaged and undamaged strands of the duplex DNA. Direct evidence is presented demonstrating preferential binding of RPA to the undamaged strand of a duplex damaged DNA molecule.

Original languageEnglish (US)
Pages (from-to)2402-2408
Number of pages7
JournalBiochemistry
Volume41
Issue number7
DOIs
StatePublished - Feb 19 2002
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry

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