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- EMDB-55291: XRCC3-RAD51C-RAD51D-XRCC2 (XRCC3 complex) capping a RAD51 filamen... -

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Basic information

Entry
Database: EMDB / ID: EMD-55291
TitleXRCC3-RAD51C-RAD51D-XRCC2 (XRCC3 complex) capping a RAD51 filament on partially duplex DNA
Map data
Sample
  • Complex: XRCC3-RAD51C-RAD51D-XRCC2 (XRCC3 complex) capping a RAD51 filament on partially duplex DNA
    • Protein or peptide: x 5 types
    • DNA: x 2 types
  • Ligand: x 4 types
KeywordsDNA binding protein / complex / tumor suppresor
Function / homology
Function and homology information


telomeric loop disassembly / double-strand break repair via synthesis-dependent strand annealing / telomere maintenance via telomere trimming / resolution of mitotic recombination intermediates / Rad51C-XRCC3 complex / Rad51B-Rad51C-Rad51D-XRCC2 complex / meiotic DNA recombinase assembly / presynaptic intermediate filament cytoskeleton / response to glucoside / crossover junction DNA endonuclease activity ...telomeric loop disassembly / double-strand break repair via synthesis-dependent strand annealing / telomere maintenance via telomere trimming / resolution of mitotic recombination intermediates / Rad51C-XRCC3 complex / Rad51B-Rad51C-Rad51D-XRCC2 complex / meiotic DNA recombinase assembly / presynaptic intermediate filament cytoskeleton / response to glucoside / crossover junction DNA endonuclease activity / mitotic recombination-dependent replication fork processing / chromosome organization involved in meiotic cell cycle / cellular response to cisplatin / telomere maintenance via telomere lengthening / DNA recombinase assembly / double-strand break repair involved in meiotic recombination / cellular response to camptothecin / t-circle formation / DNA strand invasion / mitotic recombination / lateral element / DNA strand exchange activity / gamma-tubulin binding / Impaired BRCA2 binding to PALB2 / positive regulation of mitotic cell cycle spindle assembly checkpoint / telomere maintenance via recombination / reciprocal meiotic recombination / single-stranded DNA helicase activity / centrosome cycle / regulation of centrosome duplication / sister chromatid cohesion / response to X-ray / regulation of double-strand break repair via homologous recombination / ATP-dependent DNA damage sensor activity / HDR through Single Strand Annealing (SSA) / regulation of DNA damage checkpoint / Homologous DNA Pairing and Strand Exchange / 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 / Resolution of D-loop Structures through Synthesis-Dependent Strand Annealing (SDSA) / nuclear chromosome / Resolution of D-loop Structures through Holliday Junction Intermediates / Transcriptional Regulation by E2F6 / microtubule organizing center / nuclear replication fork / Impaired BRCA2 binding to RAD51 / Presynaptic phase of homologous DNA pairing and strand exchange / ATP-dependent activity, acting on DNA / interstrand cross-link repair / positive regulation of G2/M transition of mitotic cell cycle / condensed chromosome / DNA polymerase binding / supramolecular fiber organization / replication fork / telomere maintenance / replication fork processing / cellular response to ionizing radiation / condensed nuclear chromosome / TP53 Regulates Transcription of DNA Repair Genes / cellular response to gamma radiation / meiotic cell cycle / protein-DNA complex / double-strand break repair via homologous recombination / PML body / response to toxic substance / Meiotic recombination / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / HDR through Homologous Recombination (HRR) / mitotic cell cycle / site of double-strand break / single-stranded DNA binding / Factors involved in megakaryocyte development and platelet production / double-stranded DNA binding / DNA recombination / chromosome, telomeric region / response to xenobiotic stimulus / mitochondrial matrix / hydrolase activity / DNA repair / centrosome / chromatin binding / DNA damage response / nucleolus / chromatin / perinuclear region of cytoplasm / enzyme binding / protein-containing complex / mitochondrion / DNA binding / nucleoplasm / ATP binding / identical protein binding / nucleus / cytosol / cytoplasm
Similarity search - Function
DNA repair protein XRCC2 / : / : / : / RAD51D, N-terminal domain / : / XRCC3/RpoA-like, helix-hairpin-helix domain / : / : / DNA recombination/repair protein Rad51 ...DNA repair protein XRCC2 / : / : / : / RAD51D, N-terminal domain / : / XRCC3/RpoA-like, helix-hairpin-helix domain / : / : / 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 / : / SAM-like Helix-hairpin-helix tandem / 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 3 / DNA repair protein XRCC3 / DNA repair protein XRCC2 / DNA repair protein RAD51 homolog 4 / DNA repair protein RAD51 homolog 1
Similarity search - Component
Biological speciesHomo sapiens (human) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.6 Å
AuthorsGreenhough LA / West SC
Funding support United Kingdom, 4 items
OrganizationGrant numberCountry
Wellcome TrustCC2098 United Kingdom
Medical Research Council (MRC, United Kingdom)CC2098 United Kingdom
Wellcome TrustCC2098 United Kingdom
Biotechnology and Biological Sciences Research Council (BBSRC)BB/W01355X/1 United Kingdom
CitationJournal: Science / Year: 2026
Title: Cryo-electron microscopic visualization of RAD51 filament assembly and end-capping by XRCC3-RAD51C-RAD51D-XRCC2.
Authors: Luke A Greenhough / Lorenzo Galanti / Chih-Chao Liang / Simon J Boulton / Stephen C West /
Abstract: Homologous recombination repairs DNA double-strand breaks and protects stalled replication forks, but how the five RAD51 paralogs contribute to these processes remains unclear. Mutations in the RAD51 ...Homologous recombination repairs DNA double-strand breaks and protects stalled replication forks, but how the five RAD51 paralogs contribute to these processes remains unclear. Mutations in the RAD51 paralogs are linked to heritable breast and ovarian cancers and the cancer-prone disease Fanconi anemia. In this work, we show that the RAD51 paralogs assemble into two distinct heterotetrameric complexes, RAD51B-RAD51C-RAD51D-XRCC2 (RAD51B complex) and XRCC3-RAD51C-RAD51D-XRCC2 (XRCC3 complex). The RAD51B complex promotes dynamic adenosine triphosphate hydrolysis-dependent assembly of RAD51 filaments, whereas the XRCC3 complex stably caps the 5' termini of RAD51 filaments to promote homologous pairing, as visualized by cryo-electron microscopy. Highly conserved across evolution, the XRCC3 complex reveals insights into RAD51 filament formation and capping during DNA repair and replication fork stabilization.
History
DepositionOct 3, 2025-
Header (metadata) releaseNov 12, 2025-
Map releaseNov 12, 2025-
UpdateMar 11, 2026-
Current statusMar 11, 2026Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_55291.png

Downloads & links

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Map

FileDownload / File: emd_55291.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
0.95 Å/pix.
x 360 pix.
= 342. Å		0.95 Å/pix.
x 360 pix.
= 342. Å		0.95 Å/pix.
x 360 pix.
= 342. Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.95 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.003
Minimum - Maximum-0.017712722 - 0.052124877
Average (Standard dev.)0.00006566462 (±0.0009501536)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 342.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_55291_additional_1.map
Projections & Slices
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Half map: #2

Fileemd_55291_half_map_1.map
Projections & Slices
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Half map: #1

Fileemd_55291_half_map_2.map
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Sample components

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Entire : XRCC3-RAD51C-RAD51D-XRCC2 (XRCC3 complex) capping a RAD51 filamen...

EntireName: XRCC3-RAD51C-RAD51D-XRCC2 (XRCC3 complex) capping a RAD51 filament on partially duplex DNA
Components
  • Complex: XRCC3-RAD51C-RAD51D-XRCC2 (XRCC3 complex) capping a RAD51 filament on partially duplex DNA
    • Protein or peptide: DNA repair protein RAD51 homolog 4
    • DNA: dN-31nt
    • DNA: dN-21nt
    • Protein or peptide: DNA repair protein RAD51 homolog 3
    • Protein or peptide: DNA repair protein XRCC3
    • Protein or peptide: DNA repair protein XRCC2
    • Protein or peptide: DNA repair protein RAD51 homolog 1
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: ADENOSINE-5'-DIPHOSPHATE
  • Ligand: CALCIUM ION

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Supramolecule #1: XRCC3-RAD51C-RAD51D-XRCC2 (XRCC3 complex) capping a RAD51 filamen...

SupramoleculeName: XRCC3-RAD51C-RAD51D-XRCC2 (XRCC3 complex) capping a RAD51 filament on partially duplex DNA
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#7
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: DNA repair protein RAD51 homolog 4

MacromoleculeName: DNA repair protein RAD51 homolog 4 / type: protein_or_peptide / ID: 1 / 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 RAD51 homolog 3

MacromoleculeName: DNA repair protein RAD51 homolog 3 / type: protein_or_peptide / ID: 4 / 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 #5: DNA repair protein XRCC3

MacromoleculeName: DNA repair protein XRCC3 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.899781 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MDLDLLDLNP RIIAAIKKAK LKSVKEVLHF SGPDLKRLTN LSSPEVWHLL RTASLHLRGS SILTALQLHQ QKERFPTQHQ RLSLGCPVL DALLRGGLPL DGITELAGRS SAGKTQLALQ LCLAVQFPRQ HGGLEAGAVY ICTEDAFPHK RLQQLMAQQP R LRTDVPGE ...String:
MDLDLLDLNP RIIAAIKKAK LKSVKEVLHF SGPDLKRLTN LSSPEVWHLL RTASLHLRGS SILTALQLHQ QKERFPTQHQ RLSLGCPVL DALLRGGLPL DGITELAGRS SAGKTQLALQ LCLAVQFPRQ HGGLEAGAVY ICTEDAFPHK RLQQLMAQQP R LRTDVPGE LLQKLRFGSQ IFIEHVADVD TLLECVNKKV PVLLSRGMAR LVVIDSVAAP FRCEFDSQAS APRARHLQSL GA TLRELSS AFQSPVLCIN QVTEAMEEQG AAHGPLGFWD ERVSPALGIT WANQLLVRLL ADRLREEEAA LGCPARTLRV LSA PHLPPS SCSYTISAEG VRGTPGTQSH

UniProtKB: DNA repair protein XRCC3

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Macromolecule #6: DNA repair protein XRCC2

MacromoleculeName: DNA repair protein XRCC2 / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 31.995525 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MCSAFHRAES GTELLARLEG RSSLKEIEPN LFADEDSPVH GDILEFHGPE GTGKTEMLYH LTARCILPKS EGGLEVEVLF IDTDYHFDM LRLVTILEHR LSQSSEEIIK YCLGRFFLVY CSSSTHLLLT LYSLESMFCS HPSLCLLILD SLSAFYWIDR V NGGESVNL ...String:
MCSAFHRAES 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 #7: DNA repair protein RAD51 homolog 1

MacromoleculeName: DNA repair protein RAD51 homolog 1 / type: protein_or_peptide / ID: 7 / Number of copies: 7 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.009125 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MAMQMQLEAN ADTSVEEESF GPQPISRLEQ CGINANDVKK LEEAGFHTVE AVAYAPKKEL INIKGISEAK ADKILAEAAK LVPMGFTTA TEFHQRRSEI IQITTGSKEL DKLLQGGIET GSITEMFGEF RTGKTQICHT LAVTCQLPID RGGGEGKAMY I DTEGTFRP ...String:
MAMQMQLEAN ADTSVEEESF GPQPISRLEQ CGINANDVKK LEEAGFHTVE AVAYAPKKEL INIKGISEAK ADKILAEAAK LVPMGFTTA TEFHQRRSEI IQITTGSKEL DKLLQGGIET GSITEMFGEF RTGKTQICHT LAVTCQLPID RGGGEGKAMY I DTEGTFRP ERLLAVAERY GLSGSDVLDN VAYARAFNTD HQTQLLYQAS AMMVESRYAL LIVDSATALY RTDYSGRGEL SA RQMHLAR FLRMLLRLAD EFGVAVVITN QVVAQVDGAA MFAADPKKPI GGNIIAHAST TRLYLRKGRG ETRICKIYDS PCL PEAEAM FAINADGVGD AKD

UniProtKB: DNA repair protein RAD51 homolog 1

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Macromolecule #2: dN-31nt

MacromoleculeName: dN-31nt / type: dna / ID: 2 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 9.313001 KDa
SequenceString:
(DC)(DC)(DC)(DC)(DC)(DC)(DC)(DC)(DC)(DC) (DT)(DA)(DT)(DC)(DG)(DA)(DA)(DT)(DC)(DC) (DG)(DT)(DC)(DT)(DA)(DA)(DA)(DG)(DT) (DT)(DA)

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Macromolecule #3: dN-21nt

MacromoleculeName: dN-21nt / type: dna / ID: 3 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 6.461208 KDa
SequenceString:
(DT)(DA)(DA)(DC)(DT)(DT)(DT)(DA)(DG)(DA) (DC)(DG)(DG)(DA)(DT)(DT)(DC)(DG)(DA)(DT) (DA)

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Macromolecule #8: ADENOSINE-5'-TRIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 8 / Number of copies: 9 / Formula: ATP
Molecular weightTheoretical: 507.181 Da
Chemical component information

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

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Macromolecule #9: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 9 / Number of copies: 10 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #10: ADENOSINE-5'-DIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-DIPHOSPHATE / type: ligand / ID: 10 / Number of copies: 1 / Formula: ADP
Molecular weightTheoretical: 427.201 Da
Chemical component information

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

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Macromolecule #11: CALCIUM ION

MacromoleculeName: CALCIUM ION / type: ligand / ID: 11 / Number of copies: 7 / Formula: CA
Molecular weightTheoretical: 40.078 Da

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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

BufferpH: 7.5
Component:
ConcentrationFormulaName
25.0 mMHEPES-NaOHHEPES
100.0 mMNaClSodium chloride
2.5 mMMgCl2Magnesium chloride
2.5 mMCaCl2Calcium chloride
1.0 mMATPAdenosine triphosphate
0.25 mMTCEPTris(2-carboxyethyl)phosphine hydrochloride

Details: 25 mM HEPES-NaOH pH 7.5, 100 mM NaCl, 2.5 mM MgCl2, 2.5 mM CaCl2, 1 mM ATP, 0.25 mM TCEP
GridModel: UltrAuFoil R2/2 / Material: GOLD
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
SoftwareName: EPU
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 46.3 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.3000000000000003 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 130000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 24519489
CTF correctionType: PHASE FLIPPING ONLY
Startup modelType of model: OTHER / Details: Initial model
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.6 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Software - details: 3DFlex / Number images used: 230120
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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