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- PDB-8hr1: Cryo-EM structure of SSX1 bound to the unmodified nucleosome at a... -

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Basic information

Entry
Database: PDB / ID: 8hr1
TitleCryo-EM structure of SSX1 bound to the unmodified nucleosome at a resolution of 3.02 angstrom
Components
  • (DNA (147-MER)) x 2
  • Histone H2A type 1-B/E
  • Histone H2B type 1-K
  • Histone H3
  • Histone H4
  • SSX1
KeywordsSTRUCTURAL PROTEIN / SSX1 / unmodified nucleosome / Synovial Sarcoma / ssBAF / reader protein
Function / homology
Function and homology information


polytene chromosome / protein localization to CENP-A containing chromatin / 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 ...polytene chromosome / protein localization to CENP-A containing chromatin / 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 / RNA Polymerase I Promoter Opening / Inhibition of DNA recombination at telomere / Assembly of the ORC complex at the origin of replication / Meiotic synapsis / 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 / innate immune response in mucosa / Defective pyroptosis / HDACs deacetylate histones / Regulation of endogenous retroelements by Piwi-interacting RNAs (piRNAs) / RNA Polymerase I Promoter Escape / Nonhomologous End-Joining (NHEJ) / 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 / G2/M DNA damage checkpoint / NoRC negatively regulates rRNA expression / B-WICH complex positively regulates rRNA expression / DNA Damage/Telomere Stress Induced Senescence / Pre-NOTCH Transcription and Translation / Meiotic recombination / Activation of anterior HOX genes in hindbrain development during early embryogenesis / Metalloprotease DUBs / RMTs methylate histone arginines / Transcriptional regulation of granulopoiesis / HCMV Early Events / antimicrobial humoral immune response mediated by antimicrobial peptide / structural constituent of chromatin / UCH proteinases / antibacterial humoral response / heterochromatin formation / nucleosome / 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 / MLL4 and MLL3 complexes regulate expression of PPARG target genes in adipogenesis and hepatic steatosis / chromatin organization / Processing of DNA double-strand break ends / Senescence-Associated Secretory Phenotype (SASP) / Oxidative Stress Induced Senescence / defense response to Gram-negative bacterium / Estrogen-dependent gene expression / killing of cells of another organism / defense response to Gram-positive bacterium / Ub-specific processing proteases / protein heterodimerization activity / Amyloid fiber formation / negative regulation of cell population proliferation / extracellular space / DNA binding / extracellular exosome / nucleoplasm / nucleus / cytosol
Similarity search - Function
Histone, subunit A / Histone, subunit A / : / 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, subunit A / Histone, subunit A / : / 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 / Orthogonal Bundle / Mainly Alpha
Similarity search - Domain/homology
DNA / DNA (> 10) / DNA (> 100) / Histone H3 / Histone H4 / Histone H2B type 1-K / Histone H2A type 1-B/E
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.02 Å
AuthorsZebin, T. / Ai, H.S. / Ziyu, X. / Man, P. / Liu, L.
Funding support China, 2items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)22137005,92253302 China
Other government2022TQ0170, 2022M720075
CitationJournal: Nat Struct Mol Biol / Year: 2024
Title: Synovial sarcoma X breakpoint 1 protein uses a cryptic groove to selectively recognize H2AK119Ub nucleosomes.
Authors: Zebin Tong / Huasong Ai / Ziyu Xu / Kezhang He / Guo-Chao Chu / Qiang Shi / Zhiheng Deng / Qiaomei Xue / Maoshen Sun / Yunxiang Du / Lujun Liang / Jia-Bin Li / Man Pan / Lei Liu /
Abstract: The cancer-specific fusion oncoprotein SS18-SSX1 disturbs chromatin accessibility by hijacking the BAF complex from the promoters and enhancers to the Polycomb-repressed chromatin regions. This ...The cancer-specific fusion oncoprotein SS18-SSX1 disturbs chromatin accessibility by hijacking the BAF complex from the promoters and enhancers to the Polycomb-repressed chromatin regions. This process relies on the selective recognition of H2AK119Ub nucleosomes by synovial sarcoma X breakpoint 1 (SSX1). However, the mechanism underlying the selective recognition of H2AK119Ub nucleosomes by SSX1 in the absence of ubiquitin (Ub)-binding capacity remains unknown. Here we report the cryo-EM structure of SSX1 bound to H2AK119Ub nucleosomes at 3.1-Å resolution. Combined in vitro biochemical and cellular assays revealed that the Ub recognition by SSX1 is unique and depends on a cryptic basic groove formed by H3 and the Ub motif on the H2AK119 site. Moreover, this unorthodox binding mode of SSX1 induces DNA unwrapping at the entry/exit sites. Together, our results describe a unique mode of site-specific ubiquitinated nucleosome recognition that underlies the specific hijacking of the BAF complex to Polycomb regions by SS18-SSX1 in synovial sarcoma.
History
DepositionDec 14, 2022Deposition site: PDBJ / Processing site: PDBJ
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Revision 1.1Jan 17, 2024Group: Database references / Category: citation / citation_author
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Revision 1.3Jun 25, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details / 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
B: Histone H4
C: Histone H2A type 1-B/E
D: Histone H2B type 1-K
E: Histone H3
F: Histone H4
G: Histone H2A type 1-B/E
H: Histone H2B type 1-K
S: SSX1
I: DNA (147-MER)
J: DNA (147-MER)


Theoretical massNumber of molelcules
Total (without water)178,04111
Polymers178,04111
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Protein , 4 types, 8 molecules AEBFCGDH

#1: Protein Histone H3


Mass: 11401.268 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CALMAC_LOCUS17614 / Production host: Escherichia coli (E. coli) / References: UniProt: A0A653DHJ5
#2: Protein Histone H4


Mass: 9509.197 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Escherichia coli (E. coli) / References: UniProt: A0A8D3AFV4
#3: Protein Histone H2A type 1-B/E / Histone H2A.2 / Histone H2A/a / Histone H2A/m


Mass: 11740.742 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-K / H2B K / HIRA-interacting protein 1


Mass: 10076.528 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: H2BC12, H2BFT, HIRIP1, HIST1H2BK / Production host: Escherichia coli (E. coli) / References: UniProt: O60814

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Protein/peptide , 1 types, 1 molecules S

#5: Protein/peptide SSX1


Mass: 1836.150 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SSX1 / Production host: Escherichia coli (E. coli)

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DNA chain , 2 types, 2 molecules IJ

#6: DNA chain DNA (147-MER)


Mass: 45604.047 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)
#7: DNA chain DNA (147-MER)


Mass: 45145.754 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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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: SSX1-unmodified nucleosome complex / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.28 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 recordingAverage exposure time: 2.56 sec. / Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.02 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 151369 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00916326
ELECTRON MICROSCOPYf_angle_d0.92523293
ELECTRON MICROSCOPYf_dihedral_angle_d20.1238891
ELECTRON MICROSCOPYf_chiral_restr0.0552650
ELECTRON MICROSCOPYf_plane_restr0.0041646

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