Precise binding of single-stranded DNA termini by human RAD52 protein

Carol A. Parsons, Peter Baumann, Eric Van Dyck, Stephen C. West*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

73 Citations (Scopus)

Abstract

The human RAD52 protein, which exhibits a heptameric ring structure, has been shown to bind resected double strand breaks (DSBs), consistent with an early role in meiotic recombination and DSB repair. In this work, we show that RAD52 binds single-stranded and tailed duplex DNA molecules via precise interactions with the terminal base. When probed with hydroxyl radicals, ssDNA-RAD52 complexes exhibit a four-nucleotide repeat hypersensitivity pattern. This unique pattern is due to the interaction of RAD52 with either a 5' or a 3' terminus of the ssDNA, is sequence independent and is phased precisely from the terminal nucleotide. Hypersensitivity is observed over ~ 36 nucleotides, consistent with the length of DNA that is protected by RAD52 in nuclease protection assays. We propose that RAD52 binds DNA breaks via specific interactions with the terminal base, leading to the formation of a precisely organized ssDNA-RAD52 complex in which the DNA lies on an exposed surface of the protein. This protein-DNA arrangement may facilitate the DNA-DNA interactions necessary for RAD52-mediated annealing of complementary DNA strands.

Original languageEnglish
Pages (from-to)4175-4181
Number of pages7
JournalEMBO Journal
Volume19
Issue number15
DOIs
Publication statusPublished - 1 Aug 2000
Externally publishedYes

Keywords

  • Hydroxyl radicals
  • Hypersensitivity
  • RAD52
  • Single-stranded DNA

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