Linked Life Data

18317453

Source:http://linkedlifedata.com/resource/pubmed/id/18317453

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
28
pubmed:dateCreated
2008-6-26
pubmed:abstractText
The cellular response to the introduction of double strand DNA breaks involves complexes of protein interactions that govern cell cycle checkpoint arrest and repair of the DNA lesions. The checkpoint kinases Chk1 and Chk2 phosphorylate the carboxy-terminal domain of hBRCA2, a protein involved in recombination-mediated DNA repair (HRR) and replication fork maintenance. Cells deficient in hBRCA2 are hypersensitive to DNA damaging agents. Phosphorylation of the residue in hBRCA2 targeted by the Chk1 and Chk2 kinases regulates its interaction with Rad51. Furthermore, the cell line lex1/lex2, which lacks the carboxy-terminal domain containing the phosphorylated residue, does not support localization of Rad51 to nuclear foci after exposure to UV or treatment with ionizing radiation (IR). The data show that either phosphorylation of Rad51 by Chk1 or phosphorylation of the carboxy-terminal domain of hBRCA2 by Chk1 or Chk2 plays a critical role in the binding of Rad51 to hBRCA2 and the subsequent recruitment of Rad51 to sites of DNA damage. While depletion of Chk1 from cells leads to loss of Rad51 localization to nuclear foci in response to replication arrest, cells lacking Chk2 also show a defect in Rad51 localization, but only in presence of double strand DNA breaks, indicating that each of these kinases may contribute somewhat differently to the formation of Rad51 nucleoprotein filaments depending on the type of DNA damage incurred by the cells.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/Apoptosis Regulatory Proteins, http://linkedlifedata.com/resource/pubmed/chemical/BLID protein, human, http://linkedlifedata.com/resource/pubmed/chemical/BRCA2 Protein, http://linkedlifedata.com/resource/pubmed/chemical/BRCA2 protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Checkpoint kinase 1, http://linkedlifedata.com/resource/pubmed/chemical/Nuclear Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Protein Kinases, http://linkedlifedata.com/resource/pubmed/chemical/Protein-Serine-Threonine Kinases, http://linkedlifedata.com/resource/pubmed/chemical/RAD51 protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Rad51 Recombinase, http://linkedlifedata.com/resource/pubmed/chemical/checkpoint kinase 2
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1476-5594
pubmed:author
pubmed:issnType
Electronic
pubmed:day
26
pubmed:volume
27
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3977-85
pubmed:dateRevised
2011-11-2
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
The checkpoint kinases Chk1 and Chk2 regulate the functional associations between hBRCA2 and Rad51 in response to DNA damage.
pubmed:affiliation
Department of Cell and Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA.
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural