TY - JOUR
T1 - Conformational flexibility and oligomerization of BRCA2 regions induced by RAD51 interaction
AU - Sidhu, Arshdeep
AU - Grosbart, Małgorzata
AU - Sánchez, Humberto
AU - Verhagen, Bram
AU - van der Zon, Nick L.L.
AU - Ristić, Dejan
AU - van Rossum-Fikkert, Sarah E.
AU - Wyman, Claire
PY - 2020
Y1 - 2020
N2 - BRCA2 is a key breast cancer associated protein that is predicted to have interspersed regions of intrinsic disorder. Intrinsic disorder coupled with large size likely allows BRCA2 to sample a broad range of conformational space. We expect that the resulting dynamic arrangements of BRCA2 domains are a functionally important aspect of its role in homologous recombination DNA repair. To determine the architectural organization and the associated conformational landscape of BRCA2, we used scanning force microscopy based single molecule analyses to map the flexible regions of the protein and characterize which regions influence oligomerization. We show that the N- and the C-terminal regions are the main flexible regions. Both of these regions also influence BRCA2 oligomerization and interaction with RAD51. In the central Brc repeat region, Brc 1-4 and Brc 5-8 contribute synergistically to BRCA2 interaction with RAD51. We also analysed several single amino acid changes that are potentially clinically relevant and found one, the variant of F1524V, which disrupts key interactions and alters the conformational landscape of the protein. We describe the overall conformation spectrum of BRCA2, which suggests that dynamic structural transitions are key features of its biological function, maintaining genomic stability.
AB - BRCA2 is a key breast cancer associated protein that is predicted to have interspersed regions of intrinsic disorder. Intrinsic disorder coupled with large size likely allows BRCA2 to sample a broad range of conformational space. We expect that the resulting dynamic arrangements of BRCA2 domains are a functionally important aspect of its role in homologous recombination DNA repair. To determine the architectural organization and the associated conformational landscape of BRCA2, we used scanning force microscopy based single molecule analyses to map the flexible regions of the protein and characterize which regions influence oligomerization. We show that the N- and the C-terminal regions are the main flexible regions. Both of these regions also influence BRCA2 oligomerization and interaction with RAD51. In the central Brc repeat region, Brc 1-4 and Brc 5-8 contribute synergistically to BRCA2 interaction with RAD51. We also analysed several single amino acid changes that are potentially clinically relevant and found one, the variant of F1524V, which disrupts key interactions and alters the conformational landscape of the protein. We describe the overall conformation spectrum of BRCA2, which suggests that dynamic structural transitions are key features of its biological function, maintaining genomic stability.
UR - http://www.scopus.com/inward/record.url?scp=85091691663&partnerID=8YFLogxK
U2 - 10.1093/nar/gkaa648
DO - 10.1093/nar/gkaa648
M3 - Article
C2 - 32785644
AN - SCOPUS:85091691663
SN - 0305-1048
VL - 48
SP - 9649
EP - 9659
JO - Nucleic Acids Research
JF - Nucleic Acids Research
IS - 17
ER -