Linked Life Data

12152085

Source:http://linkedlifedata.com/resource/pubmed/id/12152085

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6897
pubmed:dateCreated
2002-8-1
pubmed:databankReference
pubmed:abstractText
The Mre11 complex (Mre11 Rad50 Nbs1) is central to chromosomal maintenance and functions in homologous recombination, telomere maintenance and sister chromatid association. These functions all imply that the linked binding of two DNA substrates occurs, although the molecular basis for this process remains unknown. Here we present a 2.2 A crystal structure of the Rad50 coiled-coil region that reveals an unexpected dimer interface at the apex of the coiled coils in which pairs of conserved Cys-X-X-Cys motifs form interlocking hooks that bind one Zn(2+) ion. Biochemical, X-ray and electron microscopy data indicate that these hooks can join oppositely protruding Rad50 coiled-coil domains to form a flexible bridge of up to 1,200 A. This suggests a function for the long insertion in the Rad50 ABC-ATPase domain. The Rad50 hook is functional, because mutations in this motif confer radiation sensitivity in yeast and disrupt binding at the distant Mre11 nuclease interface. These data support an architectural role for the Rad50 coiled coils in forming metal-mediated bridging complexes between two DNA-binding heads. The resulting assemblies have appropriate lengths and conformational properties to link sister chromatids in homologous recombination and DNA ends in non-homologous end-joining.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0028-0836
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
418
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
562-6
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:12152085-Adenosine Triphosphatases, pubmed-meshheading:12152085-Amino Acid Motifs, pubmed-meshheading:12152085-Amino Acid Sequence, pubmed-meshheading:12152085-Binding Sites, pubmed-meshheading:12152085-Crystallography, X-Ray, pubmed-meshheading:12152085-Cysteine, pubmed-meshheading:12152085-DNA Repair, pubmed-meshheading:12152085-DNA-Binding Proteins, pubmed-meshheading:12152085-Dimerization, pubmed-meshheading:12152085-Endodeoxyribonucleases, pubmed-meshheading:12152085-Exodeoxyribonucleases, pubmed-meshheading:12152085-Fungal Proteins, pubmed-meshheading:12152085-Humans, pubmed-meshheading:12152085-Microscopy, Electron, pubmed-meshheading:12152085-Models, Molecular, pubmed-meshheading:12152085-Molecular Sequence Data, pubmed-meshheading:12152085-Mutation, pubmed-meshheading:12152085-Protein Binding, pubmed-meshheading:12152085-Protein Structure, Quaternary, pubmed-meshheading:12152085-Protein Structure, Tertiary, pubmed-meshheading:12152085-Radiation Tolerance, pubmed-meshheading:12152085-Recombination, Genetic, pubmed-meshheading:12152085-Saccharomyces cerevisiae, pubmed-meshheading:12152085-Saccharomyces cerevisiae Proteins, pubmed-meshheading:12152085-Zinc
pubmed:year
2002
pubmed:articleTitle
The Rad50 zinc-hook is a structure joining Mre11 complexes in DNA recombination and repair.
pubmed:affiliation
[1] Department of Molecular Biology and Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California 92037, USA [2] Gene Center and Institute of Biochemistry, University of Munich, 81377 Munich, Germany.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't