Breaking new ground into RAD51–BRC repeats interplay in Homologous Recombination

Rinaldi F, Franco P, Veronesi M, Romeo E, Bresciani V, Varignani G, Catalano F, Bernetti M, Masetti M, Langer J, Girotto S, Cavalli A, (2025) DOI

SASDWN6 – RAD51 [F86E, A89E] in complex with BRCA2 truncation containing the first, second, third and fourth BRC repeats (BRC1-4) SEC-SAXS

Breast cancer type 2 susceptibility protein (BRC repeats 1-4)
DNA repair protein RAD51 homolog 1 (F86E A89E)
MWexperimental 221 kDa
MWexpected 210 kDa
VPorod 409 nm3
log I(s) 5.32×10-2 5.32×10-3 5.32×10-4 5.32×10-5
Breast cancer type 2 susceptibility protein (BRC repeats 1-4) DNA repair protein RAD51 homolog 1 (F86E A89E) small angle scattering data  s, nm-1
ln I(s)
Breast cancer type 2 susceptibility protein (BRC repeats 1-4) DNA repair protein RAD51 homolog 1 (F86E A89E) Guinier plot ln 5.32×10-2 Rg: 7.7 nm 0 (7.7 nm)-2 s2
(sRg)2I(s)/I(0)
Breast cancer type 2 susceptibility protein (BRC repeats 1-4) DNA repair protein RAD51 homolog 1 (F86E A89E) Kratky plot 1.104 0 3 sRg
p(r)
Breast cancer type 2 susceptibility protein (BRC repeats 1-4) DNA repair protein RAD51 homolog 1 (F86E A89E) pair distance distribution function Rg: 8.4 nm 0 Dmax: 34 nm

Data validation


Fits and models


log I(s)
 s, nm-1
Breast cancer type 2 susceptibility protein (BRC repeats 1-4) DNA repair protein RAD51 homolog 1 (F86E A89E) ALPHAFOLD model

log I(s)
 s, nm-1
Breast cancer type 2 susceptibility protein (BRC repeats 1-4) DNA repair protein RAD51 homolog 1 (F86E A89E) ALPHAFOLD model

log I(s)
 s, nm-1
Breast cancer type 2 susceptibility protein (BRC repeats 1-4) DNA repair protein RAD51 homolog 1 (F86E A89E) MULTIFOXS model
Breast cancer type 2 susceptibility protein (BRC repeats 1-4) DNA repair protein RAD51 homolog 1 (F86E A89E) MULTIFOXS model
Breast cancer type 2 susceptibility protein (BRC repeats 1-4) DNA repair protein RAD51 homolog 1 (F86E A89E) MULTIFOXS model
Breast cancer type 2 susceptibility protein (BRC repeats 1-4) DNA repair protein RAD51 homolog 1 (F86E A89E) MULTIFOXS model
Breast cancer type 2 susceptibility protein (BRC repeats 1-4) DNA repair protein RAD51 homolog 1 (F86E A89E) MULTIFOXS model

Synchrotron SAXS data from solutions of RAD51 [F86E, A89E] in complex with BRCA2 truncation containing the first, second, third and fourth BRC repeats (BRC1-4) SEC-SAXS in 20 mM K₂HPO₄/KH₂PO₄, 100 mM NaCl, 100 mM Li₂SO₄, 1 mM DTT, 1% sucrose, pH 8 were collected on the B21 beam line at the Diamond Light Source storage ring (Didcot, UK) using a Eiger 4M detector at a sample-detector distance of 3.7 m and at a wavelength of λ = 0.09464 nm (I(s) vs s, where s = 4πsinθ/λ, and 2θ is the scattering angle). In-line size-exclusion chromatography (SEC) SAS was employed. The SEC parameters were as follows: A 55.00 μl sample at 3.7 mg/ml was injected at a 0.07 ml/min flow rate onto a Cytiva Superose 6 Increase 3.2/300 column at 15°C. 600 successive 3 second frames were collected. The data were normalized to the intensity of the transmitted beam and radially averaged; the scattering of the solvent-blank was subtracted.

Molecular weight has been inferred through Volume of Correlation (Vc). Sample molecular weight and monodispersity has been independently confirmed through static light scattering (SLS). 16 successive frames were collected through the sample elution peak (from a total of 600 frames).

Breast cancer type 2 susceptibility protein (BRC repeats 1-4) (BRC1-4)
Mol. type   Protein
Organism   Homo sapiens
Olig. state   Monomer
Mon. MW   62.1 kDa
 
UniProt   P51587 (1002-1551)
Sequence   FASTA
 
DNA repair protein RAD51 homolog 1 (F86E A89E) (RAD51 tetramer)
Mol. type   Protein
Organism   Homo sapiens
Olig. state   Tetramer
Mon. MW   37.1 kDa
 
UniProt   Q06609 (1-339)
Sequence   FASTA