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- PDB-8pbc: RAD51 filament on ssDNA bound by the BRCA2 c-terminus -

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Basic information

Entry
Database: PDB / ID: 8pbc
TitleRAD51 filament on ssDNA bound by the BRCA2 c-terminus
Components
  • Breast cancer type 2 susceptibility protein
  • DNA (30-MER)
  • DNA repair protein RAD51 homolog 1
KeywordsRECOMBINATION / RAD51 / BRCA2 / Filament / Complex
Function / homology
Function and homology information


BRCA2-MAGE-D1 complex / negative regulation of mammary gland epithelial cell proliferation / presynaptic intermediate filament cytoskeleton / mitotic recombination-dependent replication fork processing / cellular response to camptothecin / chromosome organization involved in meiotic cell cycle / establishment of protein localization to telomere / telomere maintenance via telomere lengthening / positive regulation of DNA ligation / Impaired BRCA2 translocation to the nucleus ...BRCA2-MAGE-D1 complex / negative regulation of mammary gland epithelial cell proliferation / presynaptic intermediate filament cytoskeleton / mitotic recombination-dependent replication fork processing / cellular response to camptothecin / chromosome organization involved in meiotic cell cycle / establishment of protein localization to telomere / telomere maintenance via telomere lengthening / positive regulation of DNA ligation / Impaired BRCA2 translocation to the nucleus / Impaired BRCA2 binding to SEM1 (DSS1) / double-strand break repair involved in meiotic recombination / nuclear ubiquitin ligase complex / cellular response to hydroxyurea / replication-born double-strand break repair via sister chromatid exchange / lateral element / telomere maintenance via recombination / DNA recombinase assembly / histone H4 acetyltransferase activity / histone H3 acetyltransferase activity / regulation of DNA damage checkpoint / mitotic recombination / Impaired BRCA2 binding to PALB2 / DNA strand invasion / HDR through MMEJ (alt-NHEJ) / gamma-tubulin binding / DNA strand exchange activity / reciprocal meiotic recombination / DNA repair complex / Defective homologous recombination repair (HRR) due to BRCA1 loss of function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA1 binding function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA2/RAD51/RAD51C binding function / oocyte maturation / Homologous DNA Pairing and Strand Exchange / Resolution of D-loop Structures through Synthesis-Dependent Strand Annealing (SDSA) / response to UV-C / Resolution of D-loop Structures through Holliday Junction Intermediates / single-stranded DNA helicase activity / inner cell mass cell proliferation / ATP-dependent DNA damage sensor activity / DNA damage response, signal transduction by p53 class mediator resulting in transcription of p21 class mediator / hematopoietic stem cell proliferation / HDR through Single Strand Annealing (SSA) / Impaired BRCA2 binding to RAD51 / regulation of double-strand break repair via homologous recombination / nuclear chromosome / female gonad development / replication fork processing / male meiosis I / Transcriptional Regulation by E2F6 / DNA unwinding involved in DNA replication / Presynaptic phase of homologous DNA pairing and strand exchange / centrosome duplication / response to X-ray / intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator / ATP-dependent activity, acting on DNA / interstrand cross-link repair / DNA polymerase binding / condensed chromosome / positive regulation of mitotic cell cycle / meiotic cell cycle / regulation of cytokinesis / condensed nuclear chromosome / secretory granule / male germ cell nucleus / cellular response to ionizing radiation / nucleotide-excision repair / response to gamma radiation / regulation of protein phosphorylation / double-strand break repair via homologous recombination / HDR through Homologous Recombination (HRR) / brain development / PML body / Meiotic recombination / cellular senescence / double-strand break repair / site of double-strand break / single-stranded DNA binding / spermatogenesis / double-stranded DNA binding / DNA recombination / protease binding / chromosome, telomeric region / mitochondrial matrix / DNA repair / centrosome / DNA damage response / chromatin binding / regulation of DNA-templated transcription / chromatin / nucleolus / positive regulation of DNA-templated transcription / perinuclear region of cytoplasm / enzyme binding / ATP hydrolysis activity / protein-containing complex / mitochondrion / nucleoplasm / ATP binding / identical protein binding
Similarity search - Function
: / BRCA2, OB2 / BRCA2, OB3 / Tower domain / Breast cancer type 2 susceptibility protein, helical domain / BRCA2 helical domain superfamily / BRCA2, oligonucleotide/oligosaccharide-binding, domain 3 / Tower / BRCA2, helical / Tower ...: / BRCA2, OB2 / BRCA2, OB3 / Tower domain / Breast cancer type 2 susceptibility protein, helical domain / BRCA2 helical domain superfamily / BRCA2, oligonucleotide/oligosaccharide-binding, domain 3 / Tower / BRCA2, helical / Tower / BRCA2 repeat / BRCA2, OB1 / Breast cancer type 2 susceptibility protein / BRCA2 repeat / BRCA2, oligonucleotide/oligosaccharide-binding, domain 1 / BRCA2 repeat profile. / DNA recombination/repair protein Rad51 / DNA recombination and repair protein, RecA-like / DNA recombination and repair protein Rad51-like, C-terminal / Rad51 / DNA recombination and repair protein RecA, monomer-monomer interface / RecA family profile 2. / DNA recombination and repair protein RecA-like, ATP-binding domain / RecA family profile 1. / DNA repair Rad51/transcription factor NusA, alpha-helical / Helix-hairpin-helix domain / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / Nucleic acid-binding, OB-fold / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ADENOSINE-5'-TRIPHOSPHATE / DNA / DNA (> 10) / Breast cancer type 2 susceptibility protein / DNA repair protein RAD51 homolog 1
Similarity search - Component
Biological speciesHomo sapiens (human)
synthetic construct (others)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 2.61 Å
AuthorsAppleby, R. / Pellegrini, L.
Funding support United Kingdom, 2items
OrganizationGrant numberCountry
Wellcome Trust221892/Z/20/ United Kingdom
Biotechnology and Biological Sciences Research Council (BBSRC)2271086 United Kingdom
CitationJournal: Nat Commun / Year: 2023
Title: Structural basis for stabilisation of the RAD51 nucleoprotein filament by BRCA2.
Authors: Robert Appleby / Luay Joudeh / Katie Cobbett / Luca Pellegrini /
Abstract: The BRCA2 tumour suppressor protein preserves genomic integrity via interactions with the DNA-strand exchange RAD51 protein in homology-directed repair. The RAD51-binding TR2 motif at the BRCA2 C- ...The BRCA2 tumour suppressor protein preserves genomic integrity via interactions with the DNA-strand exchange RAD51 protein in homology-directed repair. The RAD51-binding TR2 motif at the BRCA2 C-terminus is essential for protection and restart of stalled replication forks. Biochemical evidence shows that TR2 recognises filamentous RAD51, but existing models of TR2 binding to RAD51 lack a structural basis. Here we used cryo-electron microscopy and structure-guided mutagenesis to elucidate the mechanism of TR2 binding to nucleoprotein filaments of human RAD51. We find that TR2 binds across the protomer interface in the filament, acting as a brace for adjacent RAD51 molecules. TR2 targets an acidic-patch motif on human RAD51 that serves as a recruitment hub in fission yeast Rad51 for recombination mediators Rad52 and Rad55-Rad57. Our findings provide a structural rationale for RAD51 filament stabilisation by BRCA2 and reveal a common recruitment mechanism of recombination mediators to the RAD51 filament.
History
DepositionJun 9, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Nov 15, 2023Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: DNA repair protein RAD51 homolog 1
B: DNA repair protein RAD51 homolog 1
C: DNA repair protein RAD51 homolog 1
D: DNA repair protein RAD51 homolog 1
E: DNA repair protein RAD51 homolog 1
F: DNA repair protein RAD51 homolog 1
G: DNA repair protein RAD51 homolog 1
H: DNA repair protein RAD51 homolog 1
I: DNA repair protein RAD51 homolog 1
J: DNA repair protein RAD51 homolog 1
K: DNA repair protein RAD51 homolog 1
L: Breast cancer type 2 susceptibility protein
M: Breast cancer type 2 susceptibility protein
N: Breast cancer type 2 susceptibility protein
O: Breast cancer type 2 susceptibility protein
P: Breast cancer type 2 susceptibility protein
Q: Breast cancer type 2 susceptibility protein
R: Breast cancer type 2 susceptibility protein
S: Breast cancer type 2 susceptibility protein
T: Breast cancer type 2 susceptibility protein
U: Breast cancer type 2 susceptibility protein
V: DNA (30-MER)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)478,06655
Polymers471,60622
Non-polymers6,46133
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
DNA repair protein RAD51 homolog 1 / HsRAD51 / hRAD51 / RAD51 homolog A


Mass: 37009.125 Da / Num. of mol.: 11
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: RAD51, RAD51A, RECA / Production host: Escherichia coli (E. coli) / References: UniProt: Q06609
#2: Protein/peptide
Breast cancer type 2 susceptibility protein / Fanconi anemia group D1 protein


Mass: 5483.415 Da / Num. of mol.: 10 / Source method: obtained synthetically / Source: (synth.) Homo sapiens (human) / References: UniProt: P51587
#3: DNA chain DNA (30-MER)


Mass: 9671.227 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)
#4: Chemical
ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 11 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Comment: ATP, energy-carrying molecule*YM
#5: Chemical...
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 22 / Source method: obtained synthetically / Formula: Ca
Has ligand of interestN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: FILAMENT / 3D reconstruction method: helical reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSourceDetails
1RAD51 filament formed on ssDNA and bound with a peptide corresponding to the BRCA2 c-terminusCOMPLEX#1-#30MULTIPLE SOURCES
2DNA repair protein RAD51 homolog 1COMPLEX#11RECOMBINANTRAD51 was recombinantly purified BRCA2 c-terminus peptide was synthesised 30-mer ssDNA was synthesised
3Breast cancer type 2 susceptibility proteinCOMPLEX#21RECOMBINANT
4DNA (30-MER)COMPLEX#31RECOMBINANT
Molecular weight
IDEntity assembly-IDExperimental value
11NO
21NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
22Homo sapiens (human)9606
33Homo sapiens (human)9606
44synthetic construct (others)32630
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-IDPlasmid
22Escherichia coli (E. coli)562pMBP4-RAD51
33synthetic construct (others)32630
44synthetic construct (others)32630
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 130000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 900 nm
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 52.6 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
4CTFFIND4.1.5CTF correction
7Coot0.9.8.5model fitting
9RELION3.1initial Euler assignment
10RELION3.1final Euler assignment
11RELION3.1classification
12RELION3.13D reconstruction
13PHENIXdev-4707model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmerty
IDImage processing-IDAngular rotation/subunit (°)Axial rise/subunit (Å)Axial symmetry
1156.216.1C1
2156.216.1C1
3D reconstructionResolution: 2.61 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1 / Symmetry type: HELICAL
Atomic model buildingProtocol: OTHER / Space: REAL

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