Detection of protein folding defects caused by BRCA1-BRCT truncation and missense mutations.
Most cancer-associated BRCA1 mutations identified to date result in the premature translational termination of the protein, highlighting a crucial role for the C-terminal, BRCT repeat region in mediating BRCA1 tumor suppressor function. However, the molecular and genetic effects of missense mutations that map to the BRCT region remain largely unknown. Using a protease-based assay, we directly assessed the sensitivity of the folding of the BRCT domain to an extensive set of truncation and single amino acid substitutions derived from breast cancer screening programs. The protein can tolerate truncations of up to 8 amino acids, but further deletion results in drastic BRCT folding defects. This molecular phenotype can be correlated with an increased susceptibility to disease. A cross-validated computational assessment of the BRCT mutation data base suggests that as much as half of all BRCT missense mutations contribute to BRCA1 loss of function and disease through protein-destabilizing effects. The coupled use of proteolytic methods and computational predictive methods to detect mutant BRCA1 conformations at the protein level will augment the efficacy of current BRCA1 screening protocols, especially in the absence of clinical data that can be used to discriminate deleterious BRCT missense mutations from benign polymorphisms.
Williams
R Scott
RS
Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.
Chasman
Daniel I
DI
Hau
D Duong
DD
Hui
Benjamin
B
Lau
Albert Y
AY
Glover
J N Mark
JN
D000595:Amino Acid Sequence; D000596:Amino Acids / Q000737:chemistry; D019313:BRCA1 Protein / Q000737:chemistry*; D003062:Codon; D004305:Dose-Response Relationship, Drug; D019398:Genes, BRCA1; D005822:Genetic Vectors; D006801:Humans; D008958:Models, Molecular; D008969:Molecular Sequence Data; D016296:Mutagenesis; D009154:Mutation; D020125:Mutation, Missense; D010641:Phenotype; D011110:Polymorphism, Genetic; D011487:Protein Conformation; D017510:Protein Folding; D017434:Protein Structure, Tertiary; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012984:Software; D014357:Trypsin / Q000494:pharmacology
D000596:Amino Acids; D019313:BRCA1 Protein; D003062:Codon; D014357:Trypsin