The N-terminal domain of the human Rad51 protein binds DNA: Structure and a DNA binding surface as revealed by NMR

Hideki Aihara, Yutaka Ito, Hitoshi Kurumizaka, Shigeyuki Yokoyama, Takehiko Shibata

Research output: Contribution to journalArticle

106 Citations (Scopus)

Abstract

Human Rad51 protein (HsRad51) is a homolog of Escherichia coli RecA protein, and functions in DNA repair and recombination. In higher eukaryotes, Rad51 protein is essential for cell viability. The N-terminal region of HsRad51 is highly conserved among eukaryotic Rad51 proteins but is absent from RecA, suggesting a Rad51-specific function for this region. Here, we have determined the structure of the N-terminal part of HsRad51 by NMR spectroscopy. The N-terminal region forms a compact domain consisting of five short helices, which shares structural similarity with a domain of endonuclease III, a DNA repair enzyme of E. coli. NMR experiments did not support the involvement of the N-terminal domain in HsRad51-HsBrca2 interaction or the self-association of HsRad51 as proposed by previous studies. However, NMR tiration experiments demonstrated a physical interaction of the domain with DNA, and allowed mapping of the DNA binding surface. Mutation analysis showed that the DNA binding surface is essential for double-stranded and single-stranded DNA binding of HsRad51. Our results suggest the presence of a DNA binding site on the outside surface of the HsRad51 filament and provide a possible explanation for the regulation of DNA binding by phosphorylation within the N-terminal domain.

Original languageEnglish
Pages (from-to)495-504
Number of pages10
JournalJournal of Molecular Biology
Volume290
Issue number2
DOIs
Publication statusPublished - 1999 Jul 9
Externally publishedYes

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Keywords

  • DNA binding
  • Genetic recombination
  • NMR spectroscopy
  • Rad51 protein
  • Solution structure

ASJC Scopus subject areas

  • Virology

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