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Entry
Database: PDB / ID: 7lya
TitleCryo-EM structure of the human nucleosome core particle with linked histone proteins H2A and H2B
Components
  • DNA (146-MER)
  • DNA (147-MER)
  • Histone H2A type 1-B/E
  • Histone H2B type 1-J
  • Histone H3.1Histone H3
  • Histone H4
KeywordsSTRUCTURAL PROTEIN/DNA / Nucleosome core particle / chromatin / DNA replication / DNA repair / STRUCTURAL PROTEIN-DNA complex
Function / homology
Function and homology information


protein localization to CENP-A containing chromatin / negative regulation of megakaryocyte differentiation / CENP-A containing nucleosome / Packaging Of Telomere Ends / Chromatin modifying enzymes / regulation of gene expression, epigenetic / Cleavage of the damaged purine / Recognition and association of DNA glycosylase with site containing an affected purine / Deposition of new CENPA-containing nucleosomes at the centromere / chromatin organization => GO:0006325 ...protein localization to CENP-A containing chromatin / negative regulation of megakaryocyte differentiation / CENP-A containing nucleosome / Packaging Of Telomere Ends / Chromatin modifying enzymes / regulation of gene expression, epigenetic / Cleavage of the damaged purine / Recognition and association of DNA glycosylase with site containing an affected purine / Deposition of new CENPA-containing nucleosomes at the centromere / chromatin organization => GO:0006325 / negative regulation of tumor necrosis factor-mediated signaling pathway / Recognition and association of DNA glycosylase with site containing an affected pyrimidine / Cleavage of the damaged pyrimidine / Inhibition of DNA recombination at telomere / Meiotic synapsis / Interleukin-7 signaling / telomere organization / RNA Polymerase I Promoter Opening / DNA replication-dependent chromatin assembly / Assembly of the ORC complex at the origin of replication / SUMOylation of chromatin organization proteins / DNA methylation / innate immune response in mucosa / SIRT1 negatively regulates rRNA expression / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / Condensation of Prophase Chromosomes / chromatin organization => GO:0006325 / HCMV Late Events / PRC2 methylates histones and DNA / Defective pyroptosis / RNA Polymerase I Promoter Escape / HDACs deacetylate histones / nuclear chromosome / NoRC negatively regulates rRNA expression / Nonhomologous End-Joining (NHEJ) / Transcriptional regulation by small RNAs / Formation of the beta-catenin:TCF transactivating complex / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / B-WICH complex positively regulates rRNA expression / Activated PKN1 stimulates transcription of AR (androgen receptor) regulated genes KLK2 and KLK3 / lipopolysaccharide binding / Metalloprotease DUBs / G2/M DNA damage checkpoint / DNA Damage/Telomere Stress Induced Senescence / RMTs methylate histone arginines / HDMs demethylate histones / nucleosome assembly / Meiotic recombination / Pre-NOTCH Transcription and Translation / PKMTs methylate histone lysines / HCMV Early Events / Activation of anterior HOX genes in hindbrain development during early embryogenesis / Transcriptional regulation of granulopoiesis / UCH proteinases / nucleosome / DNA-templated transcription initiation / E3 ubiquitin ligases ubiquitinate target proteins / RUNX1 regulates transcription of genes involved in differentiation of HSCs / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / Processing of DNA double-strand break ends / Factors involved in megakaryocyte development and platelet production / HATs acetylate histones / Senescence-Associated Secretory Phenotype (SASP) / killing of cells of another organism / Oxidative Stress Induced Senescence / antibacterial humoral response / Estrogen-dependent gene expression / chromosome, telomeric region / antimicrobial humoral immune response mediated by antimicrobial peptide / Ub-specific processing proteases / cadherin binding / defense response to Gram-negative bacterium / defense response to Gram-positive bacterium / protein heterodimerization activity / Amyloid fiber formation / negative regulation of cell population proliferation / protein domain specific binding / protein-containing complex / RNA binding / DNA binding / extracellular space / extracellular exosome / extracellular region / membrane / nucleoplasm / nucleus / cytosol
Similarity search - Function
Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A signature. / Histone H2A conserved site / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone H2A / Histone 2A / Histone H4, conserved site ...Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A signature. / Histone H2A conserved site / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone H2A / Histone 2A / Histone H4, conserved site / Histone H4 signature. / Histone H4 / Histone H4 / CENP-T/Histone H4, histone fold / Centromere kinetochore component CENP-T histone fold / TATA box binding protein associated factor / TATA box binding protein associated factor (TAF), histone-like fold domain / Histone H3 signature 1. / Histone H3 signature 2. / Histone H3 / Histone H3/CENP-A / Histone H2A/H2B/H3 / Core histone H2A/H2B/H3/H4 / Histone-fold
Similarity search - Domain/homology
Histone H4 / Histone H2B type 1-J / DNA (> 10) / Histone H2A type 1-B/E / DNA (> 100) / DNA / Histone H3.1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.91 Å
AuthorsHu, Q. / Botuyan, M.V. / Zhao, D. / Cui, D. / Mer, E. / Mer, G.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)R01 CA132878 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35 GM136262 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01 GM116829 United States
CitationJournal: Nature / Year: 2021
Title: Mechanisms of BRCA1-BARD1 nucleosome recognition and ubiquitylation.
Authors: Qi Hu / Maria Victoria Botuyan / Debiao Zhao / Gaofeng Cui / Elie Mer / Georges Mer /
Abstract: The BRCA1-BARD1 tumour suppressor is an E3 ubiquitin ligase necessary for the repair of DNA double-strand breaks by homologous recombination. The BRCA1-BARD1 complex localizes to damaged chromatin ...The BRCA1-BARD1 tumour suppressor is an E3 ubiquitin ligase necessary for the repair of DNA double-strand breaks by homologous recombination. The BRCA1-BARD1 complex localizes to damaged chromatin after DNA replication and catalyses the ubiquitylation of histone H2A and other cellular targets. The molecular bases for the recruitment to double-strand breaks and target recognition of BRCA1-BARD1 remain unknown. Here we use cryo-electron microscopy to show that the ankyrin repeat and tandem BRCT domains in BARD1 adopt a compact fold and bind to nucleosomal histones, DNA and monoubiquitin attached to H2A amino-terminal K13 or K15, two signals known to be specific for double-strand breaks. We further show that RING domains in BRCA1-BARD1 orient an E2 ubiquitin-conjugating enzyme atop the nucleosome in a dynamic conformation, primed for ubiquitin transfer to the flexible carboxy-terminal tails of H2A and variant H2AX. Our work reveals a regulatory crosstalk in which recognition of monoubiquitin by BRCA1-BARD1 at the N terminus of H2A blocks the formation of polyubiquitin chains and cooperatively promotes ubiquitylation at the C terminus of H2A. These findings elucidate the mechanisms of BRCA1-BARD1 chromatin recruitment and ubiquitylation specificity, highlight key functions of BARD1 in both processes and explain how BRCA1-BARD1 promotes homologous recombination by opposing the DNA repair protein 53BP1 in post-replicative chromatin. These data provide a structural framework to evaluate BARD1 variants and help to identify mutations that drive the development of cancer.
History
DepositionMar 6, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 28, 2021Provider: repository / Type: Initial release
Revision 1.1Aug 4, 2021Group: Database references / Category: citation
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.title / _citation.year
Revision 1.2Aug 25, 2021Group: Database references / Category: citation / citation_author / database_2
Item: _citation.pdbx_database_id_PubMed / _citation.title ..._citation.pdbx_database_id_PubMed / _citation.title / _citation_author.name / _database_2.pdbx_DOI / _database_2.pdbx_database_accession
Revision 1.3Sep 1, 2021Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last

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Structure visualization

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Structure viewerMolecule:
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Assembly

Deposited unit
A: Histone H3.1
B: Histone H4
D: Histone H2B type 1-J
E: Histone H3.1
F: Histone H4
H: Histone H2B type 1-J
I: DNA (147-MER)
J: DNA (146-MER)
C: Histone H2A type 1-B/E
G: Histone H2A type 1-B/E


Theoretical massNumber of molelcules
Total (without water)199,73810
Polymers199,73810
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: SAXS
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 4 types, 8 molecules AEBFDHCG

#1: Protein Histone H3.1 / Histone H3 / Histone H3/a / Histone H3/b / Histone H3/c / Histone H3/d / Histone H3/f / Histone H3/h / Histone ...Histone H3/a / Histone H3/b / Histone H3/c / Histone H3/d / Histone H3/f / Histone H3/h / Histone H3/i / Histone H3/j / Histone H3/k / Histone H3/l


Mass: 15786.534 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human)
Gene: H3C1, H3FA, HIST1H3A, H3C2, H3FL, HIST1H3B, H3C3, H3FC HIST1H3C, H3C4, H3FB, HIST1H3D, H3C6, H3FD, HIST1H3E, H3C7, H3FI, HIST1H3F, H3C8, H3FH, HIST1H3G, H3C10, H3FK, HIST1H3H, H3C11, H3FF, ...Gene: H3C1, H3FA, HIST1H3A, H3C2, H3FL, HIST1H3B, H3C3, H3FC HIST1H3C, H3C4, H3FB, HIST1H3D, H3C6, H3FD, HIST1H3E, H3C7, H3FI, HIST1H3F, H3C8, H3FH, HIST1H3G, H3C10, H3FK, HIST1H3H, H3C11, H3FF, HIST1H3I, H3C12, H3FJ, HIST1H3J
Production host: Escherichia coli (E. coli) / References: UniProt: P68431
#2: Protein Histone H4 /


Mass: 11743.792 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human)
Gene: H4C1, H4/A, H4FA, HIST1H4A, H4C2, H4/I, H4FI, HIST1H4B, H4C3, H4/G, H4FG, HIST1H4C, H4C4, H4/B, H4FB, HIST1H4D, H4C5, H4/J, H4FJ, HIST1H4E, H4C6, H4/C, H4FC, HIST1H4F, H4C8, H4/H, H4FH, ...Gene: H4C1, H4/A, H4FA, HIST1H4A, H4C2, H4/I, H4FI, HIST1H4B, H4C3, H4/G, H4FG, HIST1H4C, H4C4, H4/B, H4FB, HIST1H4D, H4C5, H4/J, H4FJ, HIST1H4E, H4C6, H4/C, H4FC, HIST1H4F, H4C8, H4/H, H4FH, HIST1H4H, H4C9, H4/M, H4FM, HIST1H4I, H4C11, H4/E, H4FE, HIST1H4J, H4C12, H4/D, H4FD, HIST1H4K, H4C13, H4/K, H4FK, HIST1H4L, H4C14, H4/N, H4F2, H4FN, HIST2H4, HIST2H4A, H4C15, H4/O, H4FO, HIST2H4B, H4-16, HIST4H4
Production host: Escherichia coli (E. coli) / References: UniProt: P62805
#3: Protein Histone H2B type 1-J / Histone H2B.1 / Histone H2B.r / H2B/r


Mass: 13930.181 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: H2BC11, H2BFR, HIST1H2BJ / Production host: Escherichia coli (E. coli) / References: UniProt: P06899
#6: Protein Histone H2A type 1-B/E / Histone H2A.2 / Histone H2A/a / Histone H2A/m


Mass: 13034.193 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: H2AC4, H2AFM, HIST1H2AB, H2AC8, H2AFA, HIST1H2AE / Production host: Escherichia coli (E. coli) / References: UniProt: P04908

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DNA chain , 2 types, 2 molecules IJ

#4: DNA chain DNA (147-MER)


Mass: 45138.770 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Escherichia coli (E. coli)
#5: DNA chain DNA (146-MER)


Mass: 45610.043 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Escherichia coli (E. coli)

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Nucleosome core particle with linked histone proteins H2A and H2B
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightUnits: MEGADALTONS / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenConc.: 0.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: 10 mM HEPES, 100 mM NaCl, 1 mM DTT, pH 7.5
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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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 FIELDBright-field microscopy / Nominal magnification: 22500 X / Cs: 2.7 mm
Specimen holderSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 1 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 5490

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Processing

SoftwareName: PHENIX / Version: 1.16_3549: / Classification: refinement
EM software
IDNameVersionCategory
2cryoSPARC2.14particle selection
3SerialEMimage acquisition
5cryoSPARC2.14CTF correction
8PHENIX1.18.2-3874model fitting
10PHENIX1.18.2-3874model refinement
11cryoSPARC2.14initial Euler assignment
12cryoSPARC2.14final Euler assignment
13cryoSPARC2.14classification
14cryoSPARC2.143D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 6380972
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 2.91 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 414315 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00712919
ELECTRON MICROSCOPYf_angle_d0.64518702
ELECTRON MICROSCOPYf_dihedral_angle_d22.5327149
ELECTRON MICROSCOPYf_chiral_restr0.0412124
ELECTRON MICROSCOPYf_plane_restr0.0041355

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