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- PDB-9j8m: Cryo-EM structure of BAF-Lamin A/C IgF-nucleosome complex (High m... -

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Entry
Database: PDB / ID: 9j8m
TitleCryo-EM structure of BAF-Lamin A/C IgF-nucleosome complex (High mobility complex)
Components
  • (DNA (193-MER)) x 2
  • Barrier-to-autointegration factor
  • Histone H2A type 1-B/E
  • Histone H2B type 1-J
  • Histone H3.1
  • Histone H4
  • Lamin-A/C
KeywordsNUCLEAR PROTEIN / Nucleosome / DNA binding proteins / Nuclear lamina
Function / homology
Function and homology information


structural constituent of nuclear lamina / negative regulation of mesenchymal cell proliferation / negative regulation of protein ADP-ribosylation / establishment or maintenance of microtubule cytoskeleton polarity / Breakdown of the nuclear lamina / DNA double-strand break attachment to nuclear envelope / ventricular cardiac muscle cell development / Depolymerization of the Nuclear Lamina / nuclear envelope organization / Nuclear Envelope Breakdown ...structural constituent of nuclear lamina / negative regulation of mesenchymal cell proliferation / negative regulation of protein ADP-ribosylation / establishment or maintenance of microtubule cytoskeleton polarity / Breakdown of the nuclear lamina / DNA double-strand break attachment to nuclear envelope / ventricular cardiac muscle cell development / Depolymerization of the Nuclear Lamina / nuclear envelope organization / Nuclear Envelope Breakdown / nuclear pore localization / lamin filament / protein localization to nuclear envelope / mitotic nuclear membrane reassembly / XBP1(S) activates chaperone genes / nuclear lamina / Initiation of Nuclear Envelope (NE) Reformation / regulation of protein localization to nucleus / intermediate filament / Integration of viral DNA into host genomic DNA / Autointegration results in viral DNA circles / regulation of telomere maintenance / negative regulation of type I interferon production / negative regulation of cardiac muscle hypertrophy in response to stress / nuclear migration / negative regulation of viral genome replication / muscle organ development / negative regulation of cGAS/STING signaling pathway / 2-LTR circle formation / Deregulated CDK5 triggers multiple neurodegenerative pathways in Alzheimer's disease models / Vpr-mediated nuclear import of PICs / negative regulation of release of cytochrome c from mitochondria / Integration of provirus / APOBEC3G mediated resistance to HIV-1 infection / protein localization to nucleus / negative regulation of tumor necrosis factor-mediated signaling pathway / chromosome organization / negative regulation of megakaryocyte differentiation / protein localization to CENP-A containing chromatin / Chromatin modifying enzymes / Replacement of protamines by nucleosomes in the male pronucleus / CENP-A containing nucleosome / condensed chromosome / Packaging Of Telomere Ends / Recognition and association of DNA glycosylase with site containing an affected purine / Cleavage of the damaged purine / Deposition of new CENPA-containing nucleosomes at the centromere / Recognition and association of DNA glycosylase with site containing an affected pyrimidine / Cleavage of the damaged pyrimidine / telomere organization / Interleukin-7 signaling / RNA Polymerase I Promoter Opening / Inhibition of DNA recombination at telomere / negative regulation of innate immune response / regulation of cell migration / epigenetic regulation of gene expression / Meiotic synapsis / Assembly of the ORC complex at the origin of replication / SUMOylation of chromatin organization proteins / Regulation of endogenous retroelements by the Human Silencing Hub (HUSH) complex / DNA methylation / Condensation of Prophase Chromosomes / Chromatin modifications during the maternal to zygotic transition (MZT) / SIRT1 negatively regulates rRNA expression / HCMV Late Events / innate immune response in mucosa / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / PRC2 methylates histones and DNA / negative regulation of extrinsic apoptotic signaling pathway / Regulation of endogenous retroelements by KRAB-ZFP proteins / Defective pyroptosis / HDACs deacetylate histones / Regulation of endogenous retroelements by Piwi-interacting RNAs (piRNAs) / Nonhomologous End-Joining (NHEJ) / RNA Polymerase I Promoter Escape / lipopolysaccharide binding / Transcriptional regulation by small RNAs / Formation of the beta-catenin:TCF transactivating complex / Activated PKN1 stimulates transcription of AR (androgen receptor) regulated genes KLK2 and KLK3 / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / HDMs demethylate histones / G2/M DNA damage checkpoint / DNA integration / NoRC negatively regulates rRNA expression / regulation of protein stability / B-WICH complex positively regulates rRNA expression / DNA Damage/Telomere Stress Induced Senescence / PKMTs methylate histone lysines / structural constituent of cytoskeleton / Meiotic recombination / Pre-NOTCH Transcription and Translation / response to virus / Metalloprotease DUBs / RMTs methylate histone arginines / Activation of anterior HOX genes in hindbrain development during early embryogenesis / nuclear matrix / Transcriptional regulation of granulopoiesis / protein import into nucleus / HCMV Early Events / antimicrobial humoral immune response mediated by antimicrobial peptide
Similarity search - Function
Barrier- to-autointegration factor, BAF / Barrier-to-autointegration factor, BAF superfamily / : / Barrier to autointegration factor / Barrier to autointegration factor / Lamin tail domain superfamily / Lamin tail domain / Lamin Tail Domain / Lamin-tail (LTD) domain profile. / Intermediate filament protein, conserved site ...Barrier- to-autointegration factor, BAF / Barrier-to-autointegration factor, BAF superfamily / : / Barrier to autointegration factor / Barrier to autointegration factor / Lamin tail domain superfamily / Lamin tail domain / Lamin Tail Domain / Lamin-tail (LTD) domain profile. / Intermediate filament protein, conserved site / Intermediate filament protein / Intermediate filament (IF) rod domain signature. / Intermediate filament, rod domain / Intermediate filament (IF) rod domain profile. / Intermediate filament protein / : / Histone H2B signature. / Histone H2A conserved site / Histone H2A signature. / Histone H2B / Histone H2B / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone 2A / Histone H2A / TATA box binding protein associated factor / TATA box binding protein associated factor (TAF), histone-like fold domain / Histone H4, conserved site / Histone H4 signature. / Histone H4 / Histone H4 / CENP-T/Histone H4, histone fold / Centromere kinetochore component CENP-T histone fold / Histone H3 signature 1. / Histone H3 signature 2. / Histone H3 / Histone H3/CENP-A / Histone H2A/H2B/H3 / Core histone H2A/H2B/H3/H4 domain / Histone-fold
Similarity search - Domain/homology
DNA / DNA (> 10) / DNA (> 100) / Barrier-to-autointegration factor / Prelamin-A/C / Histone H2A type 1-B/E / Histone H2B type 1-J / Histone H4 / Histone H3.1
Similarity search - Component
Biological speciesHomo sapiens (human)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.82 Å
AuthorsHorikoshi, N. / Miyake, R. / Sogawa-Fujiwara, C. / Ogasawara, M. / Takizawa, Y. / Kurumizaka, H.
Funding support Japan, 10items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS)JP22K06076 Japan
Japan Society for the Promotion of Science (JSPS)JP23K24013 Japan
Japan Society for the Promotion of Science (JSPS)JP24H02328 Japan
Japan Society for the Promotion of Science (JSPS)JP22K06098 Japan
Japan Society for the Promotion of Science (JSPS)JP24H02319 Japan
Japan Society for the Promotion of Science (JSPS)JP24H02328 Japan
Japan Society for the Promotion of Science (JSPS)JP23H05475 Japan
Japan Science and TechnologyJPMJER1901 Japan
Japan Agency for Medical Research and Development (AMED)JP24ama121009 Japan
Japan Agency for Medical Research and Development (AMED)JP24ama121002 Japan
CitationJournal: Nat Commun / Year: 2025
Title: Cryo-EM structures of the BAF-Lamin A/C complex bound to nucleosomes.
Authors: Naoki Horikoshi / Ryosuke Miyake / Chizuru Sogawa-Fujiwara / Mitsuo Ogasawara / Yoshimasa Takizawa / Hitoshi Kurumizaka /
Abstract: Barrier-to-autointegration factor (BAF) associates with mitotic chromosomes and promotes nuclear envelope assembly by recruiting proteins, such as Lamins, required for the reconstruction of the ...Barrier-to-autointegration factor (BAF) associates with mitotic chromosomes and promotes nuclear envelope assembly by recruiting proteins, such as Lamins, required for the reconstruction of the nuclear envelope and lamina. BAF also mediates chromatin anchoring to the nuclear lamina via Lamin A/C. However, the mechanism by which BAF and Lamin A/C bind chromatin and affect the chromatin organization remains elusive. Here we report the cryo-electron microscopy structures of BAF-Lamin A/C-nucleosome complexes. We find that the BAF dimer complexed with the Lamin A/C IgF domain occupies the nucleosomal dyad position, forming a tripartite nucleosomal DNA binding structure. We also show that the Lamin A/C Lys486 and His506 residues, which are reportedly mutated in lipodystrophy patients, directly contact the DNA at the nucleosomal dyad. Excess BAF-Lamin A/C complexes symmetrically bind other nucleosomal DNA sites and connect two BAF-Lamin A/C-nucleosome complexes. Although the linker histone H1 competes with BAF-Lamin A/C binding at the nucleosomal dyad region, the two BAF-Lamin A/C molecules still bridge two nucleosomes. These findings provide insights into the mechanism by which BAF, Lamin A/C, and/or histone H1 bind nucleosomes and influence chromatin organization within the nucleus.
History
DepositionAug 21, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Feb 26, 2025Provider: repository / Type: Initial release
Revision 1.0Feb 26, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Feb 26, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Feb 26, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
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Revision 1.0Feb 26, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Feb 26, 2025Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Feb 26, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Jul 2, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jul 2, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Histone H3.1
B: Histone H4
C: Histone H2A type 1-B/E
D: Histone H2B type 1-J
E: Histone H3.1
F: Histone H4
G: Histone H2A type 1-B/E
H: Histone H2B type 1-J
I: DNA (193-MER)
J: DNA (193-MER)
K: Barrier-to-autointegration factor
L: Barrier-to-autointegration factor
M: Lamin-A/C


Theoretical massNumber of molelcules
Total (without water)269,82313
Polymers269,82313
Non-polymers00
Water00
1


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

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Components

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Protein , 6 types, 11 molecules AEBFCGDHKLM

#1: Protein Histone H3.1 / 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: 15719.445 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: 11676.703 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: H4C1 / Production host: Escherichia coli (E. coli) / References: UniProt: P62805
#3: Protein Histone H2A type 1-B/E / Histone H2A.2 / Histone H2A/a / Histone H2A/m


Mass: 14447.825 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
#4: Protein Histone H2B type 1-J / Histone H2B.1 / Histone H2B.r / H2B/r


Mass: 14217.516 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
#7: Protein Barrier-to-autointegration factor / Breakpoint cluster region protein 1


Mass: 10487.059 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: BANF1, BAF, BCRG1 / Production host: Escherichia coli (E. coli) / References: UniProt: O75531
#8: Protein Lamin-A/C / 70 kDa lamin / Renal carcinoma antigen NY-REN-32


Mass: 17551.369 Da / Num. of mol.: 1 / Fragment: Ig-fold domain
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: LMNA, LMN1 / Production host: Escherichia coli (E. coli) / References: UniProt: P02545

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DNA chain , 2 types, 2 molecules IJ

#5: DNA chain DNA (193-MER)


Mass: 59351.793 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli (E. coli)
#6: DNA chain DNA (193-MER)


Mass: 59823.086 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli (E. coli)

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Details

Has protein modificationN

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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: High mobility complex containing BAF, Lamin A/C IgF, and nucleosome
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.27 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen 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 defocus max: 2500 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 60.4 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.82 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 18999 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00317104
ELECTRON MICROSCOPYf_angle_d0.49424718
ELECTRON MICROSCOPYf_dihedral_angle_d26.5867004
ELECTRON MICROSCOPYf_chiral_restr0.0322782
ELECTRON MICROSCOPYf_plane_restr0.0031829

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