The BRC repeats in BRCA2 are critical for RAD51 binding and resistance to methyl methanesulfonate treatment

Phang Lang Chen, Chi Fen Chen, Yumay Chen, Jun Xiao, Zelton D Sharp, Wen Hwa Lee

Research output: Contribution to journalArticle

311 Citations (Scopus)

Abstract

The BRCA2 gene was identified based on its involvement in familial breast cancer. The analysis of its sequence predicts that the gene encodes a protein with 3,418 amino acids but provides very few clues pointing to its biological function. In an attempt to address this question, specific antibodies were prepared that identified the gene product of BRCA2 as a 390- kDa nuclear protein. Furthermore, direct binding of human RAD51 to each of the four single 30-amino acid BRC repeats located at the 5' portion of exon 11 of BRCA2 was demonstrated. Such an interaction is significant, as BRCA2 and RAD51 can be reciprocally coimmunoprecipitated by each of the individual, specific antibodies and form complexes in vivo. Inferring from the function of RAD51 in DNA repair, human pancreatic cancer cells, Capan-1, expressing truncated BRCA2 were shown to be hypersensitive to methyl methanesulfonate (MMS) treatment. Exogenous expression of wild-type BRCA2, but not BRC- deleted mutants, in Capan-1 cells confers resistance to MMS treatment. These results suggest that the interaction between the BRC repeats of BRCA2 and RAD51 is critical for cellular response to DNA damage caused by MMS.

Original languageEnglish (US)
Pages (from-to)5287-5292
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume95
Issue number9
DOIs
StatePublished - Apr 28 1998

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Methyl Methanesulfonate
BRCA2 Protein
BRCA2 Gene
Amino Acids
Antibodies
Nuclear Proteins
Pancreatic Neoplasms
DNA Repair
DNA Damage
Sequence Analysis
Exons
Genes
Proteins

Keywords

  • Breast cancer
  • DNA repair

ASJC Scopus subject areas

  • Genetics
  • General

Cite this

The BRC repeats in BRCA2 are critical for RAD51 binding and resistance to methyl methanesulfonate treatment. / Chen, Phang Lang; Chen, Chi Fen; Chen, Yumay; Xiao, Jun; Sharp, Zelton D; Lee, Wen Hwa.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 95, No. 9, 28.04.1998, p. 5287-5292.

Research output: Contribution to journalArticle

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