title: Structure of the single-strand annealing domain of human RAD52 protein.
abstract: In eukaryotic cells, RAD52 protein plays a central role in genetic recombination and DNA repair by (i) promoting the annealing of complementary single-stranded DNA and (ii) stimulation of the RAD51 recombinase. The single-strand annealing domain resides in the N-terminal region of the protein and is highly conserved, whereas the nonconserved RAD51-interaction domain is located in the C-terminal region. An N-terminal fragment of human RAD52 (residues 1-209) has been purified to homogeneity and, similar to the full-size protein (residues 1-418), shown to promote single-strand annealing in vitro. We have determined the crystal structure of this single-strand annealing domain at 2.7 A. The structure reveals an undecameric (11) subunit ring with extensive subunit contacts. A large, positively charged groove runs along the surface of the ring, readily suggesting a mechanism by which RAD52 presents the single strand for reannealing with complementary single-stranded DNA.
authors.affiliation: Cancer Research U.K., London Research Institute, Clare Hall Laboratories, South Mimms, Hertfordshire EN6 3LD, UK.
authors.forename: Martin R
authors.initials: MR
authors.lastname: Singleton
authors.forename: Lois M
authors.initials: LM
authors.lastname: Wentzell
authors.forename: Yilun
authors.initials: Y
authors.lastname: Liu
authors.forename: Stephen C
authors.initials: SC
authors.lastname: West
authors.forename: Dale B
authors.initials: DB
authors.lastname: Wigley
mesh_terms: D001665:Binding Sites; D018360:Crystallography, X-Ray; D004260:DNA Repair; D004277:DNA, Single-Stranded / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D006801:Humans; D008958:Models, Molecular; D015394:Molecular Structure; D010446:Peptide Fragments / Q000737:chemistry / Q000235:genetics; D017510:Protein Folding; D020836:Protein Structure, Quaternary; D017434:Protein Structure, Tertiary; D021122:Protein Subunits; D051721:Rad52 DNA Repair and Recombination Protein; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D055672:Static Electricity
chemical_list: D004277:DNA, Single-Stranded; D004268:DNA-Binding Proteins; D010446:Peptide Fragments; D021122:Protein Subunits; C497194:RAD52 protein, human; D051721:Rad52 DNA Repair and Recombination Protein; D011994:Recombinant Proteins