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- EMDB-17206: Human RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2) complex, 2.2 A resolution -

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Basic information

Entry
Database: EMDB / ID: EMD-17206
TitleHuman RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2) complex, 2.2 A resolution
Map data
Sample
  • Complex: RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2)
    • Protein or peptide: DNA repair protein RAD51 homolog 2
    • Protein or peptide: DNA repair protein RAD51 homolog 3
    • Protein or peptide: DNA repair protein RAD51 homolog 4
    • Protein or peptide: DNA repair protein XRCC2
  • Ligand: ADENOSINE-5'-DIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: water
KeywordsComplex / ssDNA-binding / ATPase / RAD51 / DNA BINDING PROTEIN
Function / homology
Function and homology information


meiotic DNA recombinase assembly / Rad51C-XRCC3 complex / Rad51B-Rad51C-Rad51D-XRCC2 complex / female meiosis sister chromatid cohesion / blastocyst growth / crossover junction DNA endonuclease activity / somite development / DNA strand invasion / telomere maintenance via recombination / Impaired BRCA2 binding to PALB2 ...meiotic DNA recombinase assembly / Rad51C-XRCC3 complex / Rad51B-Rad51C-Rad51D-XRCC2 complex / female meiosis sister chromatid cohesion / blastocyst growth / crossover junction DNA endonuclease activity / somite development / DNA strand invasion / telomere maintenance via recombination / Impaired BRCA2 binding to PALB2 / gamma-tubulin binding / reciprocal meiotic recombination / regulation of fibroblast apoptotic process / sister chromatid cohesion / centrosome cycle / 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 / Homologous DNA Pairing and Strand Exchange / Resolution of D-loop Structures through Synthesis-Dependent Strand Annealing (SDSA) / Resolution of D-loop Structures through Holliday Junction Intermediates / positive regulation of neurogenesis / ATP-dependent DNA damage sensor activity / male meiosis I / Presynaptic phase of homologous DNA pairing and strand exchange / response to X-ray / ATP-dependent activity, acting on DNA / interstrand cross-link repair / somitogenesis / positive regulation of G2/M transition of mitotic cell cycle / telomere maintenance / neurogenesis / replication fork / meiotic cell cycle / response to gamma radiation / TP53 Regulates Transcription of DNA Repair Genes / double-strand break repair via homologous recombination / multicellular organism growth / HDR through Homologous Recombination (HRR) / Meiotic recombination / single-stranded DNA binding / mitotic cell cycle / cell junction / Factors involved in megakaryocyte development and platelet production / double-stranded DNA binding / spermatogenesis / DNA recombination / negative regulation of neuron apoptotic process / in utero embryonic development / chromosome, telomeric region / regulation of cell cycle / DNA repair / intracellular membrane-bounded organelle / centrosome / positive regulation of cell population proliferation / perinuclear region of cytoplasm / ATP hydrolysis activity / mitochondrion / DNA binding / nucleoplasm / ATP binding / nucleus / cytosol / cytoplasm
Similarity search - Function
DNA repair protein XRCC2 / DNA repair protein RAD51 homologue 2 / : / : / RAD51D, N-terminal domain / DNA recombination and repair protein, RecA-like / DNA recombination and repair protein Rad51-like, C-terminal / Rad51 / DNA recombination and repair protein RecA-like, ATP-binding domain / RecA family profile 1. ...DNA repair protein XRCC2 / DNA repair protein RAD51 homologue 2 / : / : / RAD51D, N-terminal domain / DNA recombination and repair protein, RecA-like / DNA recombination and repair protein Rad51-like, C-terminal / Rad51 / DNA recombination and repair protein RecA-like, ATP-binding domain / RecA family profile 1. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
DNA repair protein RAD51 homolog 2 / DNA repair protein RAD51 homolog 3 / DNA repair protein XRCC2 / DNA repair protein RAD51 homolog 4
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.2 Å
AuthorsGreenhough LA / Liang CC / West SC
Funding support United Kingdom, European Union, 5 items
OrganizationGrant numberCountry
Biotechnology and Biological Sciences Research Council (BBSRC)BB/W01355X/1 United Kingdom
Cancer Research UKCC2098 United Kingdom
Medical Research Council (MRC, United Kingdom)CC2098 United Kingdom
Wellcome TrustCC2098 United Kingdom
European Research Council (ERC)ERC-ADG-666400European Union
CitationJournal: Nature / Year: 2023
Title: Structure and function of the RAD51B-RAD51C-RAD51D-XRCC2 tumour suppressor.
Authors: Luke A Greenhough / Chih-Chao Liang / Ondrej Belan / Simone Kunzelmann / Sarah Maslen / Monica C Rodrigo-Brenni / Roopesh Anand / Mark Skehel / Simon J Boulton / Stephen C West /
Abstract: Homologous recombination is a fundamental process of life. It is required for the protection and restart of broken replication forks, the repair of chromosome breaks and the exchange of genetic ...Homologous recombination is a fundamental process of life. It is required for the protection and restart of broken replication forks, the repair of chromosome breaks and the exchange of genetic material during meiosis. Individuals with mutations in key recombination genes, such as BRCA2 (also known as FANCD1), or the RAD51 paralogues RAD51B, RAD51C (also known as FANCO), RAD51D, XRCC2 (also known as FANCU) and XRCC3, are predisposed to breast, ovarian and prostate cancers and the cancer-prone syndrome Fanconi anaemia. The BRCA2 tumour suppressor protein-the product of BRCA2-is well characterized, but the cellular functions of the RAD51 paralogues remain unclear. Genetic knockouts display growth defects, reduced RAD51 focus formation, spontaneous chromosome abnormalities, sensitivity to PARP inhibitors and replication fork defects, but the precise molecular roles of RAD51 paralogues in fork stability, DNA repair and cancer avoidance remain unknown. Here we used cryo-electron microscopy, AlphaFold2 modelling and structural proteomics to determine the structure of the RAD51B-RAD51C-RAD51D-XRCC2 complex (BCDX2), revealing that RAD51C-RAD51D-XRCC2 mimics three RAD51 protomers aligned within a nucleoprotein filament, whereas RAD51B is highly dynamic. Biochemical and single-molecule analyses showed that BCDX2 stimulates the nucleation and extension of RAD51 filaments-which are essential for recombinational DNA repair-in reactions that depend on the coupled ATPase activities of RAD51B and RAD51C. Our studies demonstrate that BCDX2 orchestrates RAD51 assembly on single stranded DNA for replication fork protection and double strand break repair, in reactions that are critical for tumour avoidance.
History
DepositionApr 25, 2023-
Header (metadata) releaseJun 21, 2023-
Map releaseJun 21, 2023-
UpdateAug 2, 2023-
Current statusAug 2, 2023Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_17206.png

Downloads & links

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Map

FileDownload / File: emd_17206.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.96 Å/pix.
x 320 pix.
= 306. Å		0.96 Å/pix.
x 320 pix.
= 306. Å		0.96 Å/pix.
x 320 pix.
= 306. Å

Surface

Projections

Slices (1/3)

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Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.95625 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.007
Minimum - Maximum-0.049294688 - 0.13804032
Average (Standard dev.)0.000038638325 (±0.0012438449)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 306.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_17206_msk_1.map
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Additional map: #1

Fileemd_17206_additional_1.map
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Half map: #2

Fileemd_17206_half_map_1.map
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Half map: #1

Fileemd_17206_half_map_2.map
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Sample components

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Entire : RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2)

EntireName: RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2)
Components
  • Complex: RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2)
    • Protein or peptide: DNA repair protein RAD51 homolog 2
    • Protein or peptide: DNA repair protein RAD51 homolog 3
    • Protein or peptide: DNA repair protein RAD51 homolog 4
    • Protein or peptide: DNA repair protein XRCC2
  • Ligand: ADENOSINE-5'-DIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: water

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Supramolecule #1: RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2)

SupramoleculeName: RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2) / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Details: Recombinant BCDX2 complexes purified from Sf9 insect cells, crosslinked with 0.005% glutaraldehyde (RT, 10 minutes) in the presence of 30 nt ssDNA, and vitrified in the presence of ADP.AlFx. ...Details: Recombinant BCDX2 complexes purified from Sf9 insect cells, crosslinked with 0.005% glutaraldehyde (RT, 10 minutes) in the presence of 30 nt ssDNA, and vitrified in the presence of ADP.AlFx. THERE IS NO ssDNA BOUND TO BCDX2 IN THIS STRUCTURE
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: DNA repair protein RAD51 homolog 2

MacromoleculeName: DNA repair protein RAD51 homolog 2 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 38.296984 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGSKKLKRVG LSQELCDRLS RHQILTCQDF LCLSPLELMK VTGLSYRGVH ELLCMVSRAC APKMQTAYGI KAQRSADFSP AFLSTTLSA LDEALHGGVA CGSLTEITGP PGCGKTQFCI MMSILATLPT NMGGLEGAVV YIDTESAFSA ERLVEIAESR F PRYFNTEE ...String:
MGSKKLKRVG LSQELCDRLS RHQILTCQDF LCLSPLELMK VTGLSYRGVH ELLCMVSRAC APKMQTAYGI KAQRSADFSP AFLSTTLSA LDEALHGGVA CGSLTEITGP PGCGKTQFCI MMSILATLPT NMGGLEGAVV YIDTESAFSA ERLVEIAESR F PRYFNTEE KLLLTSSKVH LYRELTCDEV LQRIESLEEE IISKGIKLVI LDSVASVVRK EFDAQLQGNL KERNKFLARE AS SLKYLAE EFSIPVILTN QITTHLSGAL ASQADLVSPA DDLSLSEGTS GSSCVIAALG NTWSHSVNTR LILQYLDSER RQI LIAKSP LAPFTSFVYT IKEEGLVLQA YGNS

UniProtKB: DNA repair protein RAD51 homolog 2

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Macromolecule #2: DNA repair protein RAD51 homolog 3

MacromoleculeName: DNA repair protein RAD51 homolog 3 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 42.244609 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MRGKTFRFEM QRDLVSFPLS PAVRVKLVSA GFQTAEELLE VKPSELSKEV GISKAEALET LQIIRRECLT NKPRYAGTSE SHKKCTALE LLEQEHTQGF IITFCSALDD ILGGGVPLMK TTEICGAPGV GKTQLCMQLA VDVQIPECFG GVAGEAVFID T EGSFMVDR ...String:
MRGKTFRFEM QRDLVSFPLS PAVRVKLVSA GFQTAEELLE VKPSELSKEV GISKAEALET LQIIRRECLT NKPRYAGTSE SHKKCTALE LLEQEHTQGF IITFCSALDD ILGGGVPLMK TTEICGAPGV GKTQLCMQLA VDVQIPECFG GVAGEAVFID T EGSFMVDR VVDLATACIQ HLQLIAEKHK GEEHRKALED FTLDNILSHI YYFRCRDYTE LLAQVYLLPD FLSEHSKVRL VI VDGIAFP FRHDLDDLSL RTRLLNGLAQ QMISLANNHR LAVILTNQMT TKIDRNQALL VPALGESWGH AATIRLIFHW DRK QRLATL YKSPSQKECT VLFQIKPQGF RDTVVTSACS LQTEGSLSTR KRSRDPEEEL

UniProtKB: DNA repair protein RAD51 homolog 3

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Macromolecule #3: DNA repair protein RAD51 homolog 4

MacromoleculeName: DNA repair protein RAD51 homolog 4 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 35.084254 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGVLRVGLCP GLTEEMIQLL RSHRIKTVVD LVSADLEEVA QKCGLSYKAL VALRRVLLAQ FSAFPVNGAD LYEELKTSTA ILSTGIGSL DKLLDAGLYT GEVTEIVGGP GSGKTQVCLC MAANVAHGLQ QNVLYVDSNG GLTASRLLQL LQAKTQDEEE Q AEALRRIQ ...String:
MGVLRVGLCP GLTEEMIQLL RSHRIKTVVD LVSADLEEVA QKCGLSYKAL VALRRVLLAQ FSAFPVNGAD LYEELKTSTA ILSTGIGSL DKLLDAGLYT GEVTEIVGGP GSGKTQVCLC MAANVAHGLQ QNVLYVDSNG GLTASRLLQL LQAKTQDEEE Q AEALRRIQ VVHAFDIFQM LDVLQELRGT VAQQVTGSSG TVKVVVVDSV TAVVSPLLGG QQREGLALMM QLARELKTLA RD LGMAVVV TNHITRDRDS GRLKPALGRS WSFVPSTRIL LDTIEGAGAS GGRRMACLAK SSRQPTGFQE MVDIGTWGTS EQS ATLQGD QT

UniProtKB: DNA repair protein RAD51 homolog 4

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Macromolecule #4: DNA repair protein XRCC2

MacromoleculeName: DNA repair protein XRCC2 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 31.921381 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: GCSAFHRAES GTELLARLEG RSSLKEIEPN LFADEDSPVH GDILEFHGPE GTGKTEMLYH LTARCILPKS EGGLEVEVLF IDTDYHFDM LRLVTILEHR LSQSSEEIIK YCLGRFFLVY CSSSTHLLLT LYSLESMFCS HPSLCLLILD SLSAFYWIDR V NGGESVNL ...String:
GCSAFHRAES GTELLARLEG RSSLKEIEPN LFADEDSPVH GDILEFHGPE GTGKTEMLYH LTARCILPKS EGGLEVEVLF IDTDYHFDM LRLVTILEHR LSQSSEEIIK YCLGRFFLVY CSSSTHLLLT LYSLESMFCS HPSLCLLILD SLSAFYWIDR V NGGESVNL QESTLRKCSQ CLEKLVNDYR LVLFATTQTI MQKASSSSEE PSHASRRLCD VDIDYRPYLC KAWQQLVKHR MF FSKQDDS QSSNQFSLVS RCLKSNSLKK HFFIIGESGV EFC

UniProtKB: DNA repair protein XRCC2

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Macromolecule #5: ADENOSINE-5'-DIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-DIPHOSPHATE / type: ligand / ID: 5 / Number of copies: 1 / Formula: ADP
Molecular weightTheoretical: 427.201 Da
Chemical component information

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM / Adenosine diphosphate

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Macromolecule #6: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 6 / Number of copies: 3 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #7: ADENOSINE-5'-TRIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 7 / Number of copies: 2 / Formula: ATP
Molecular weightTheoretical: 507.181 Da
Chemical component information

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM / Adenosine triphosphate

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Macromolecule #8: water

MacromoleculeName: water / type: ligand / ID: 8 / Number of copies: 142 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER / Water

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.25 mg/mL
BufferpH: 7.5
Component:
ConcentrationFormulaName
25.0 mMHEPESHydroxyethylpiperazine
100.0 mMNaClSodium chlorideSodium chloride
2.5 mMMgCl2Magnesium chloride
0.5 mMADPAdenosine diphosphateAdenosine diphoshpate
0.5 mMAlCl3Aluminium chloride
10.0 mMNaFSodium fluoride
0.25 mMTCEPTris(2-carboxyethyl)phosphine
0.00075 %Tween20Polysorbate 20
0.075 mMCHAPSOCHAPS detergent3-([3-Cholamidopropyl]dimethylammonio)-2-hydroxy-1-propanesulfonate

Details: 25 mM HEPES pH 7.5, 100 mM NaCl, 2.5 mM MgCl2, 0.5 mM ADP.AlFx (0.5 mM ADP, 0.5 mM AlCl3, 10 mM NaF), 0.25 mM TCEP, 0.00075% Tween20, 0.075 mM CHAPSO
GridModel: UltrAuFoil R2/2 / Material: GOLD / Mesh: 200 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Pretreatment - Atmosphere: AIR / Details: 45 mA
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.25 µm / Nominal defocus min: 0.75 µm / Nominal magnification: 105000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 1 / Number real images: 35305 / Average exposure time: 2.78 sec. / Average electron dose: 53.2 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 25886382
Startup modelType of model: EMDB MAP
EMDB ID:

17205

Initial angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 4.0)
Final 3D classificationNumber classes: 3 / Avg.num./class: 1314578 / Software - Name: RELION (ver. 4)
Final angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 4.0)
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C1 (asymmetric) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 2.2 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 1371033
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

8ouy


Chain - Source name: PDB / Chain - Initial model type: experimental model
DetailsPDB-8OUY was initially docked into the postprocessed map using ChimeraX 1.4, and iteratively real space refined with Phenix and manually modified using COOT
RefinementSpace: REAL / Protocol: RIGID BODY FIT / Overall B value: 50.38
Output model

PDB-8ouz:
Human RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2) complex, 2.2 A resolution

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