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- EMDB-50114: The molecular basis and modulation of lamin-specific chromatin in... -

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Basic information

Entry
Database: EMDB / ID: EMD-50114
TitleThe molecular basis and modulation of lamin-specific chromatin interaction
Map data
Sample
  • Complex: Complex of laminA-peptide with nucleosome
    • Complex: Histone complex
      • Protein or peptide: Histone H3.2
      • Protein or peptide: Histone H4
      • Protein or peptide: Histone H2A type 1
      • Protein or peptide: Histone H2B 1.1
    • Complex: DNA
      • DNA: 601 wisdom DNA
      • DNA: 601 wisdom DNA
    • Complex: Peptide
      • Protein or peptide: laminA_peptide
Keywordsnucleosome lamin A specific binding / STRUCTURAL PROTEIN
Function / homology
Function and homology information


structural constituent of chromatin / nucleosome / heterochromatin formation / nucleosome assembly / protein heterodimerization activity / DNA binding / nucleoplasm / nucleus
Similarity search - Function
: / 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 ...: / 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 / Histone-fold
Similarity search - Domain/homology
Histone H2B 1.1 / Histone H2A type 1 / Histone H4 / Histone H3.2
Similarity search - Component
Biological speciesXenopus laevis (African clawed frog) / Homo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.3 Å
AuthorsWang B / Luo Q
Funding support Switzerland, 1 items
OrganizationGrant numberCountry
Swiss National Science FoundationSNSF 391 310030_207453 Switzerland
CitationJournal: Nat Struct Mol Biol / Year: 2025
Title: The molecular basis of lamin-specific chromatin interactions.
Authors: Baihui Wang / Rafael Kronenberg-Tenga / Valentina Rosti / Emanuele Di Patrizio Soldateschi / Qiang Luo / Ugo Maria Iannacchero / Louise Pinet / Matthias Eibauer / Rajaa Boujemaa-Paterski / ...Authors: Baihui Wang / Rafael Kronenberg-Tenga / Valentina Rosti / Emanuele Di Patrizio Soldateschi / Qiang Luo / Ugo Maria Iannacchero / Louise Pinet / Matthias Eibauer / Rajaa Boujemaa-Paterski / Benjamin Schuler / Chiara Lanzuolo / Ohad Medalia /
Abstract: In the cell nucleus, chromatin is anchored to the nuclear lamina, a network of lamin filaments and binding proteins that underly the inner nuclear membrane. The nuclear lamina is involved in ...In the cell nucleus, chromatin is anchored to the nuclear lamina, a network of lamin filaments and binding proteins that underly the inner nuclear membrane. The nuclear lamina is involved in chromatin organization through the interaction of lamina-associated domains within the densely packed heterochromatin regions. Using cryo-focused ion beam milling in conjunction with cryo-electron tomography, we analyzed the distribution of nucleosomes at the lamin-chromatin interface at the nanometer scale. Depletion of lamins A and C reduced nucleosome concentration at the nuclear periphery, while B-type lamin depletion contributed to nucleosome density in proximity to the lamina but not further away. We then investigated whether specific lamins can mediate direct interactions with chromatin. Using cryo-electron microscopy, we identified a specific binding motif of the lamin A tail domain that interacts with nucleosomes, distinguishing it from the other lamin isoforms. Furthermore, we examined chromatin structure dynamics using a genome-wide analysis that revealed lamin-dependent macroscopic-scale alterations in gene expression and chromatin remodeling. Our findings provide detailed insights into the dynamic and structural interplay between lamin isoforms and chromatin, molecular interactions that shape chromatin architecture and epigenetic regulation.
History
DepositionApr 17, 2024-
Header (metadata) releaseAug 13, 2025-
Map releaseAug 13, 2025-
UpdateAug 13, 2025-
Current statusAug 13, 2025Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_50114.png

Downloads & links

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Map

FileDownload / File: emd_50114.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.65 Å/pix.
x 320 pix.
= 208. Å		0.65 Å/pix.
x 320 pix.
= 208. Å		0.65 Å/pix.
x 320 pix.
= 208. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.65 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.143
Minimum - Maximum-0.25999588 - 0.5570226
Average (Standard dev.)0.00073668663 (±0.014982219)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 208.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_50114_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_50114_half_map_1.map
Projections & Slices
AxesZYX

Projections

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Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_50114_half_map_2.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Complex of laminA-peptide with nucleosome

EntireName: Complex of laminA-peptide with nucleosome
Components
  • Complex: Complex of laminA-peptide with nucleosome
    • Complex: Histone complex
      • Protein or peptide: Histone H3.2
      • Protein or peptide: Histone H4
      • Protein or peptide: Histone H2A type 1
      • Protein or peptide: Histone H2B 1.1
    • Complex: DNA
      • DNA: 601 wisdom DNA
      • DNA: 601 wisdom DNA
    • Complex: Peptide
      • Protein or peptide: laminA_peptide

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Supramolecule #1: Complex of laminA-peptide with nucleosome

SupramoleculeName: Complex of laminA-peptide with nucleosome / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#7

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Supramolecule #2: Histone complex

SupramoleculeName: Histone complex / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#4
Source (natural)Organism: Xenopus laevis (African clawed frog)

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Supramolecule #3: DNA

SupramoleculeName: DNA / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #5-#6
Source (natural)Organism: Xenopus laevis (African clawed frog)

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Supramolecule #4: Peptide

SupramoleculeName: Peptide / type: complex / ID: 4 / Parent: 1 / Macromolecule list: #7
Source (natural)Organism: Xenopus laevis (African clawed frog)

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Macromolecule #1: Histone H3.2

MacromoleculeName: Histone H3.2 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 11.47037 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
PHRYRPGTVA LREIRRYQKS TELLIRKLPF QRLVREIAQD FKTDLRFQSS AVMALQEASE AYLVALFEDT NLAAIHAKRV TIMPKDIQL ARRIRGERA

UniProtKB: Histone H3.2

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Macromolecule #2: Histone H4

MacromoleculeName: Histone H4 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 9.409056 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
KVLRDNIQGI TKPAIRRLAR RGGVKRISGL IYEETRGVLK VFLENVIRDA VTYTEHAKRK TVTAMDVVYA LKRQGRTLYG FGG

UniProtKB: Histone H4

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Macromolecule #3: Histone H2A type 1

MacromoleculeName: Histone H2A type 1 / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 12.082128 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
TRAKAKTRSS RAGLQFPVGR VHRLLRKGNY AERVGAGAPV YLAAVLEYLT AEILELAGNA ARDNKKTRII PRHLQLAVRN DEELNKLLG RVTIAQGGVL PNIQSVLLPK K

UniProtKB: Histone H2A type 1

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Macromolecule #4: Histone H2B 1.1

MacromoleculeName: Histone H2B 1.1 / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 10.9216 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
RRKTRKESYA IYVYKVLKQV HPDTGISSKA MSIMNSFVND VFERIAGEAS RLAHYNKRST ITSREIQTAV RLLLPGELAK HAVSEGTKA VTKYTSAK

UniProtKB: Histone H2B 1.1

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Macromolecule #7: laminA_peptide

MacromoleculeName: laminA_peptide / type: protein_or_peptide / ID: 7 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 1.010107 KDa
SequenceString:
AEYNLRSR

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Macromolecule #5: 601 wisdom DNA

MacromoleculeName: 601 wisdom DNA / type: dna / ID: 5 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 45.138773 KDa
SequenceString: (DT)(DA)(DT)(DC)(DG)(DA)(DG)(DA)(DA)(DT) (DC)(DC)(DC)(DG)(DG)(DT)(DG)(DC)(DC)(DG) (DA)(DG)(DG)(DC)(DC)(DG)(DC)(DT)(DC) (DA)(DA)(DT)(DT)(DG)(DG)(DT)(DC)(DG)(DT) (DA) (DG)(DA)(DC)(DA)(DG)(DC) ...String:
(DT)(DA)(DT)(DC)(DG)(DA)(DG)(DA)(DA)(DT) (DC)(DC)(DC)(DG)(DG)(DT)(DG)(DC)(DC)(DG) (DA)(DG)(DG)(DC)(DC)(DG)(DC)(DT)(DC) (DA)(DA)(DT)(DT)(DG)(DG)(DT)(DC)(DG)(DT) (DA) (DG)(DA)(DC)(DA)(DG)(DC)(DT)(DC) (DT)(DA)(DG)(DC)(DA)(DC)(DC)(DG)(DC)(DT) (DT)(DA) (DA)(DA)(DC)(DG)(DC)(DA)(DC) (DG)(DT)(DA)(DC)(DG)(DC)(DG)(DC)(DT)(DG) (DT)(DC)(DC) (DC)(DC)(DC)(DG)(DC)(DG) (DT)(DT)(DT)(DT)(DA)(DA)(DC)(DC)(DG)(DC) (DC)(DA)(DA)(DG) (DG)(DG)(DG)(DA)(DT) (DT)(DA)(DC)(DT)(DC)(DC)(DC)(DT)(DA)(DG) (DT)(DC)(DT)(DC)(DC) (DA)(DG)(DG)(DC) (DA)(DC)(DG)(DT)(DG)(DT)(DC)(DA)(DG)(DA) (DT)(DA)(DT)(DA)(DT)(DA) (DC)(DA)(DT) (DC)(DC)(DG)(DA)

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Macromolecule #6: 601 wisdom DNA

MacromoleculeName: 601 wisdom DNA / type: dna / ID: 6 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 45.570023 KDa
SequenceString: (DT)(DC)(DC)(DG)(DA)(DT)(DG)(DT)(DA)(DT) (DA)(DT)(DA)(DT)(DC)(DT)(DG)(DA)(DC)(DA) (DC)(DG)(DT)(DG)(DC)(DC)(DT)(DG)(DG) (DA)(DG)(DA)(DC)(DT)(DA)(DG)(DG)(DG)(DA) (DG) (DT)(DA)(DA)(DT)(DC)(DC) ...String:
(DT)(DC)(DC)(DG)(DA)(DT)(DG)(DT)(DA)(DT) (DA)(DT)(DA)(DT)(DC)(DT)(DG)(DA)(DC)(DA) (DC)(DG)(DT)(DG)(DC)(DC)(DT)(DG)(DG) (DA)(DG)(DA)(DC)(DT)(DA)(DG)(DG)(DG)(DA) (DG) (DT)(DA)(DA)(DT)(DC)(DC)(DC)(DC) (DT)(DT)(DG)(DG)(DC)(DG)(DG)(DT)(DT)(DA) (DA)(DA) (DA)(DC)(DG)(DC)(DG)(DG)(DG) (DG)(DG)(DA)(DC)(DA)(DG)(DC)(DG)(DC)(DG) (DT)(DA)(DC) (DG)(DT)(DG)(DC)(DG)(DT) (DT)(DT)(DA)(DA)(DG)(DC)(DG)(DG)(DT)(DG) (DC)(DT)(DA)(DG) (DA)(DG)(DC)(DT)(DG) (DT)(DC)(DT)(DA)(DC)(DG)(DA)(DC)(DC)(DA) (DA)(DT)(DT)(DG)(DA) (DG)(DC)(DG)(DG) (DC)(DC)(DT)(DC)(DG)(DG)(DC)(DA)(DC)(DC) (DG)(DG)(DG)(DA)(DT)(DT) (DC)(DT)(DC) (DG)(DA)(DT)(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: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 70.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: OTHER
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.4 µm / Nominal defocus min: 0.6 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

6zhx

Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 588553
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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