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- EMDB-46538: Two HMGN2s in complex with the nucleosome -

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Basic information

Entry
Database: EMDB / ID: EMD-46538
TitleTwo HMGN2s in complex with the nucleosome
Map dataTwo HMGN2s in complex with the nucleosome
Sample
  • Complex: Mono-nucleosome assembled with Xenopus borealis 5S rDNA and human histones in complex with two HMGN2 copies
    • Complex: 5S rDNA
      • DNA: 5S rDNA (noncoding strand)
      • DNA: 5S rDNA (coding strand)
    • Complex: Human core histones
      • Protein or peptide: Histone H3.2
      • Protein or peptide: Histone H4
      • Protein or peptide: Histone H2A type 2-A
      • Protein or peptide: Histone H2B type 1-M
    • Complex: HMGN2
      • Protein or peptide: Non-histone chromosomal protein HMG-17
Keywordshigh mobility group N proteins (HMGN proteins) / HMGN2 / nucleosome / non-histone chromosomal proteins / GENE REGULATION / GENE REGULATION-DNA complex
Function / homology
Function and homology information


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 / 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 ...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 / 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 / Inhibition of DNA recombination at telomere / RNA Polymerase I Promoter Opening / 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 / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / PRC2 methylates histones and DNA / 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 / 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 / NoRC negatively regulates rRNA expression / DNA Damage/Telomere Stress Induced Senescence / B-WICH complex positively regulates rRNA expression / PKMTs methylate histone lysines / Meiotic recombination / Pre-NOTCH Transcription and Translation / Metalloprotease DUBs / RMTs methylate histone arginines / Activation of anterior HOX genes in hindbrain development during early embryogenesis / Transcriptional regulation of granulopoiesis / HCMV Early Events / structural constituent of chromatin / UCH proteinases / nucleosome / heterochromatin formation / nucleosome assembly / E3 ubiquitin ligases ubiquitinate target proteins / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / HATs acetylate histones / RUNX1 regulates transcription of genes involved in differentiation of HSCs / Factors involved in megakaryocyte development and platelet production / chromatin organization / MLL4 and MLL3 complexes regulate expression of PPARG target genes in adipogenesis and hepatic steatosis / Processing of DNA double-strand break ends / Senescence-Associated Secretory Phenotype (SASP) / Oxidative Stress Induced Senescence / gene expression / Estrogen-dependent gene expression / chromosome, telomeric region / Ub-specific processing proteases / Amyloid fiber formation / protein heterodimerization activity / chromatin binding / negative regulation of transcription by RNA polymerase II / protein-containing complex / DNA binding / RNA binding / extracellular exosome / extracellular region / nucleoplasm / nucleus / membrane / cytosol
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 domain / Histone-fold
Similarity search - Domain/homology
Histone H4 / Histone H2A type 2-A / Histone H3.2 / Histone H2B type 1-M
Similarity search - Component
Biological speciesXenopus borealis (Kenyan clawed frog) / Homo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsAlegrio Louro J / Cruz-Becerra G / Kadonaga JT / Leschziner AE
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35 GM145296 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35 GM118060 United States
CitationJournal: Genes Dev / Year: 2025
Title: Structural basis of nucleosome recognition by the conserved Dsup and HMGN nucleosome-binding motif.
Authors: Jaime Alegrio-Louro / Grisel Cruz-Becerra / George A Kassavetis / James T Kadonaga / Andres E Leschziner /
Abstract: The tardigrade damage suppressor (Dsup) and vertebrate high-mobility group N (HMGN) proteins bind specifically to nucleosomes via a conserved motif whose structure has not been experimentally ...The tardigrade damage suppressor (Dsup) and vertebrate high-mobility group N (HMGN) proteins bind specifically to nucleosomes via a conserved motif whose structure has not been experimentally determined. Here we used cryo-EM to show that both proteins bind to the nucleosome acidic patch via analogous arginine anchors with one molecule bound to each face of the nucleosome. We additionally used the natural promoter-containing 5S rDNA sequence for structural analysis of the nucleosome. These structures of an ancient nucleosome-binding motif suggest that there is an untapped realm of proteins with a related mode of binding to chromatin.
History
DepositionAug 11, 2024-
Header (metadata) releaseAug 13, 2025-
Map releaseAug 13, 2025-
UpdateOct 15, 2025-
Current statusOct 15, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_46538.png

Downloads & links

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Map

FileDownload / File: emd_46538.map.gz / Format: CCP4 / Size: 34.3 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationTwo HMGN2s in complex with the nucleosome
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.94 Å/pix.
x 208 pix.
= 194.48 Å		0.94 Å/pix.
x 208 pix.
= 194.48 Å		0.94 Å/pix.
x 208 pix.
= 194.48 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.935 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.147
Minimum - Maximum-0.7696362 - 1.3859417
Average (Standard dev.)0.002645536 (±0.05063961)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions208208208
Spacing208208208
CellA=B=C: 194.48 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half Map A

Fileemd_46538_half_map_1.map
AnnotationHalf Map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half Map B

Fileemd_46538_half_map_2.map
AnnotationHalf Map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Mono-nucleosome assembled with Xenopus borealis 5S rDNA and human...

EntireName: Mono-nucleosome assembled with Xenopus borealis 5S rDNA and human histones in complex with two HMGN2 copies
Components
  • Complex: Mono-nucleosome assembled with Xenopus borealis 5S rDNA and human histones in complex with two HMGN2 copies
    • Complex: 5S rDNA
      • DNA: 5S rDNA (noncoding strand)
      • DNA: 5S rDNA (coding strand)
    • Complex: Human core histones
      • Protein or peptide: Histone H3.2
      • Protein or peptide: Histone H4
      • Protein or peptide: Histone H2A type 2-A
      • Protein or peptide: Histone H2B type 1-M
    • Complex: HMGN2
      • Protein or peptide: Non-histone chromosomal protein HMG-17

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Supramolecule #1: Mono-nucleosome assembled with Xenopus borealis 5S rDNA and human...

SupramoleculeName: Mono-nucleosome assembled with Xenopus borealis 5S rDNA and human histones in complex with two HMGN2 copies
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Details: The complex was cross-linked with glutaraldehyde prior to cryo-EM analysis
Source (natural)Organism: Xenopus borealis (Kenyan clawed frog)
Molecular weightTheoretical: 19 KDa

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Supramolecule #2: 5S rDNA

SupramoleculeName: 5S rDNA / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#2
Source (natural)Organism: Xenopus borealis (Kenyan clawed frog)

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Supramolecule #3: Human core histones

SupramoleculeName: Human core histones / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #3-#6
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #4: HMGN2

SupramoleculeName: HMGN2 / type: complex / ID: 4 / Parent: 1 / Macromolecule list: #7 / Details: Two copies.
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: 5S rDNA (noncoding strand)

MacromoleculeName: 5S rDNA (noncoding strand) / type: dna / ID: 1 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Xenopus borealis (Kenyan clawed frog)
Molecular weightTheoretical: 31.247957 KDa
SequenceString: (DA)(DA)(DG)(DA)(DC)(DC)(DC)(DT)(DG)(DG) (DC)(DA)(DT)(DG)(DG)(DG)(DG)(DA)(DG)(DG) (DA)(DG)(DC)(DT)(DG)(DG)(DG)(DC)(DC) (DC)(DC)(DC)(DC)(DC)(DC)(DA)(DG)(DA)(DA) (DG) (DG)(DC)(DA)(DG)(DC)(DA) ...String:
(DA)(DA)(DG)(DA)(DC)(DC)(DC)(DT)(DG)(DG) (DC)(DA)(DT)(DG)(DG)(DG)(DG)(DA)(DG)(DG) (DA)(DG)(DC)(DT)(DG)(DG)(DG)(DC)(DC) (DC)(DC)(DC)(DC)(DC)(DC)(DA)(DG)(DA)(DA) (DG) (DG)(DC)(DA)(DG)(DC)(DA)(DC)(DA) (DA)(DG)(DG)(DG)(DG)(DA)(DG)(DG)(DA)(DA) (DA)(DA) (DG)(DT)(DC)(DA)(DG)(DC)(DC) (DT)(DT)(DG)(DT)(DG)(DC)(DT)(DC)(DG)(DC) (DC)(DT)(DA) (DC)(DG)(DG)(DC)(DC)(DA) (DT)(DA)(DC)(DC)(DA)(DC)(DC)(DC)(DT)(DG) (DA)(DA)(DA)(DG) (DT)

GENBANK: GENBANK: V01426.1

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Macromolecule #2: 5S rDNA (coding strand)

MacromoleculeName: 5S rDNA (coding strand) / type: dna / ID: 2 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Xenopus borealis (Kenyan clawed frog)
Molecular weightTheoretical: 31.081727 KDa
SequenceString: (DA)(DC)(DT)(DT)(DT)(DC)(DA)(DG)(DG)(DG) (DT)(DG)(DG)(DT)(DA)(DT)(DG)(DG)(DC)(DC) (DG)(DT)(DA)(DG)(DG)(DC)(DG)(DA)(DG) (DC)(DA)(DC)(DA)(DA)(DG)(DG)(DC)(DT)(DG) (DA) (DC)(DT)(DT)(DT)(DT)(DC) ...String:
(DA)(DC)(DT)(DT)(DT)(DC)(DA)(DG)(DG)(DG) (DT)(DG)(DG)(DT)(DA)(DT)(DG)(DG)(DC)(DC) (DG)(DT)(DA)(DG)(DG)(DC)(DG)(DA)(DG) (DC)(DA)(DC)(DA)(DA)(DG)(DG)(DC)(DT)(DG) (DA) (DC)(DT)(DT)(DT)(DT)(DC)(DC)(DT) (DC)(DC)(DC)(DC)(DT)(DT)(DG)(DT)(DG)(DC) (DT)(DG) (DC)(DC)(DT)(DT)(DC)(DT)(DG) (DG)(DG)(DG)(DG)(DG)(DG)(DG)(DC)(DC)(DC) (DA)(DG)(DC) (DT)(DC)(DC)(DT)(DC)(DC) (DC)(DC)(DA)(DT)(DG)(DC)(DC)(DA)(DG)(DG) (DG)(DT)(DC)(DT) (DT)

GENBANK: GENBANK: V01426.1

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Macromolecule #3: Histone H3.2

MacromoleculeName: Histone H3.2 / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 11.617591 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
KPHRYRPGTV ALREIRRYQK STELLIRKLP FQRLVREIAQ DFKTDLRFQS SAVMALQEAS EAYLVGLFED TNLCAIHAKR VTIMPKDIQ LARRIRGERA

UniProtKB: Histone H3.2

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Macromolecule #4: Histone H4

MacromoleculeName: Histone H4 / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 9.279875 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
VLRDNIQGIT KPAIRRLARR GGVKRISGLI YEETRGVLKV FLENVIRDAV TYTEHAKRKT VTAMDVVYAL KRQGRTLYGF GG

UniProtKB: Histone H4

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Macromolecule #5: Histone H2A type 2-A

MacromoleculeName: Histone H2A type 2-A / type: protein_or_peptide / ID: 5 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 11.26816 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
KSRSSRAGLQ FPVGRVHRLL RKGNYAERVG AGAPVYMAAV LEYLTAEILE LAGNAARDNK KTRIIPRHLQ LAIRNDEELN KLLGKVTIA QGGVLPNIQA VLLP

UniProtKB: Histone H2A type 2-A

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Macromolecule #6: Histone H2B type 1-M

MacromoleculeName: Histone H2B type 1-M / type: protein_or_peptide / ID: 6 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 10.406916 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
RSRKESYSVY VYKVLKQVHP DTGISSKAMG IMNSFVNDIF ERIAGEASRL AHYNKRSTIT SREIQTAVRL LLPGELAKHA VSEGTKAVT KYTS

UniProtKB: Histone H2B type 1-M

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Macromolecule #7: Non-histone chromosomal protein HMG-17

MacromoleculeName: Non-histone chromosomal protein HMG-17 / type: protein_or_peptide / ID: 7 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 760.91 Da
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
RRSARL

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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

Concentration0.13 mg/mL
BufferpH: 7.6
Component:
ConcentrationName
0.25 %(w/V)Glutaraldehyde
23.0 mMHEPES-potassium
0.67 mMEDTA
77.0 mMPotassium chloride
0.0085 %(w/V)NP-40
1.5 %(V/V)Glycerol
50.0 mMTris
33.0 mMSodium chloride
GridModel: Quantifoil R2/1 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Support film - Film thickness: 2 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK II
DetailsThe complex between the nucleosome and HMGN2 was cross-linked with glutaraldehyde prior to vitrification.

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Name: TFS Selectris X / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Number grids imaged: 13833 / Number real images: 11761 / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.2 µm / Nominal defocus min: 0.7000000000000001 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

CTF correctionSoftware: (Name: cryoSPARC, RELION) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 55942
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC / Details: Ab-initio job in cryoSPARC.
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC / Details: Non-uniform refinement job in cryoSPARC.
Final 3D classificationNumber classes: 6 / Software - Name: RELION
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL
Output model

PDB-9d3m:
Two HMGN2s in complex with the nucleosome

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