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Impact of BRCA1 BRCT domain missense substitutions on phosphopeptide recognition

Nicolas Coquelle1, Ruth Green, J N Mark Glover

  • 1Department of Biochemistry, School of Medicine, University of Alberta, Edmonton, AB, Canada.

Biochemistry
|April 9, 2011
PubMed

Insights

Structural and binding studies of BRCA1 BRCT variants reveal how mutations impact DNA damage response and cancer risk. Understanding these changes is crucial for breast cancer screening and genetic counseling.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • The BRCA1 BRCT domain is critical for DNA damage response by binding pSer-x-x-Phe motifs.
  • Numerous missense variants in the BRCA1 BRCT domain are identified during breast cancer screening, with some linked to elevated cancer risk.

Purpose of the Study:

  • To investigate the structural and peptide-binding characteristics of BRCA1 BRCT variants affecting the phosphopeptide-binding groove.
  • To elucidate the functional impact of specific mutations on protein interactions and DNA repair.

Main Methods:

  • X-ray crystallography to determine variant structures.
  • Peptide-binding assays to assess interaction affinities.
  • Analysis of variant effects on the BRCT phosphopeptide-binding groove.

Main Results:

  • G1656D and T1700A variants highlight the importance of Ser1655 in phosphoserine recognition.
  • Arg1699 mutations (R1699W, R1699Q) substantially decrease peptide binding due to altered interactions with the Phe(+3) residue and, for R1699W, BRCT fold destabilization.
  • R1835P and E1836K variants show altered Phe(+3) pocket structure but retain significant peptide binding.

Conclusions:

  • Specific mutations in the BRCA1 BRCT domain can disrupt critical protein-protein interactions involved in DNA damage repair.
  • Understanding variant effects provides insights into the molecular mechanisms underlying BRCA1-associated breast cancer risk.
  • These findings can inform genetic variant interpretation and risk assessment in clinical settings.

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