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- PDB-8hqy: Cryo-EM structure of SSX1 bound to the H2AK119Ub nucleosome at a ... -

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Entry
Database: PDB / ID: 8hqy
TitleCryo-EM structure of SSX1 bound to the H2AK119Ub nucleosome at a resolution of 3.05 angstrom
Components
  • (Histone H2A type 1- ...) x 2
  • DNA (136-MER)
  • DNA (137-MER)
  • Histone H2B type 1-K
  • Histone H3
  • Histone H4
  • Histone H4 (Fragment)
  • Polyubiquitin-B (Fragment)
  • Protein SSX2
KeywordsSTRUCTURAL PROTEIN / SSX1 / H2AK119Ub nucleosome / Synovial Sarcoma / ssBAF / reader protein
Function / homology
Function and homology information


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 / Inhibition of DNA recombination at telomere ...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 / Inhibition of DNA recombination at telomere / RNA Polymerase I Promoter Opening / Meiotic synapsis / Assembly of the ORC complex at the origin of replication / 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 / 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 / G2/M DNA damage checkpoint / NoRC negatively regulates rRNA expression / DNA Damage/Telomere Stress Induced Senescence / B-WICH complex positively regulates rRNA expression / 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 / antimicrobial humoral immune response mediated by antimicrobial peptide / structural constituent of chromatin / UCH proteinases / antibacterial humoral response / nucleosome / heterochromatin formation / 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 / 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 / defense response to Gram-negative bacterium / killing of cells of another organism / Estrogen-dependent gene expression / defense response to Gram-positive bacterium / Ub-specific processing proteases / Amyloid fiber formation / protein heterodimerization activity / negative regulation of cell population proliferation / regulation of DNA-templated transcription / extracellular space / DNA binding / extracellular exosome / nucleoplasm / nucleus / cytosol
Similarity search - Function
Ancestral KRAB domain / SSXRD motif / SSXRD motif / KRAB-related domain profile. / KRAB box / krueppel associated box / Krueppel-associated box / KRAB domain superfamily / : / Histone H2B signature. ...Ancestral KRAB domain / SSXRD motif / SSXRD motif / KRAB-related domain profile. / KRAB box / krueppel associated box / Krueppel-associated box / KRAB domain superfamily / : / 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 / : / Ubiquitin domain signature. / Ubiquitin conserved site / Ubiquitin domain / Histone H2A/H2B/H3 / Core histone H2A/H2B/H3/H4 domain / Histone-fold / Ubiquitin family / Ubiquitin homologues / Ubiquitin domain profile. / Ubiquitin-like domain / Ubiquitin-like domain superfamily
Similarity search - Domain/homology
DNA / DNA (> 10) / DNA (> 100) / Histone H4 / Histone H3 / Histone H4 / Ubiquitin B / Histone H2B type 1-K / Histone H2A type 1-B/E / Protein SSX2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.05 Å
AuthorsZebin, T. / Ai, H.S. / Ziyu, X. / GuoChao, C. / Man, P. / Liu, L.
Funding support China, 2items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)22137005, 92253302 China
Other government2022TQ0170,2022M720075 China
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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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Histone H3
B: Histone H4 (Fragment)
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: Protein SSX2
U: Polyubiquitin-B (Fragment)
I: DNA (137-MER)
J: DNA (136-MER)


Theoretical massNumber of molelcules
Total (without water)180,39312
Polymers180,39312
Non-polymers00
Water00
1


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

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Components

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Protein , 5 types, 7 molecules AEBDHFU

#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 (Fragment)


Mass: 9509.197 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: N305_08114 / Production host: Escherichia coli (E. coli) / References: UniProt: A0A093PN76
#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
#5: Protein Histone H4


Mass: 9222.823 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) / References: UniProt: A0A8C2GGI7
#8: Protein Polyubiquitin-B (Fragment)


Mass: 8462.727 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: UBB / Production host: Escherichia coli (E. coli) / References: UniProt: J3QS39

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Histone H2A type 1- ... , 2 types, 2 molecules CG

#3: Protein Histone H2A type 1-B/E / Histone H2A.2 / Histone H2A/a / Histone H2A/m


Mass: 11740.742 Da / Num. of mol.: 1
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
#6: Protein Histone H2A type 1-B/E / Histone H2A.2 / Histone H2A/a / Histone H2A/m


Mass: 11637.600 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: HIST1H2AB, H2AFM, HIST1H2AE, H2AFA / Production host: Escherichia coli (E. coli) / References: UniProt: P04908

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Protein/peptide , 1 types, 1 molecules S

#7: Protein/peptide Protein SSX2 / Cancer/testis antigen 5.2 / CT5.2 / Synovial sarcoma / X breakpoint 2 / Tumor antigen HOM-MEL-40


Mass: 2912.261 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SSX2, SSX2A, SSX2B / Production host: Escherichia coli (E. coli) / References: UniProt: Q16385

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DNA chain , 2 types, 2 molecules IJ

#9: DNA chain DNA (137-MER)


Mass: 41800.641 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)
#10: DNA chain DNA (136-MER)


Mass: 42151.840 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-H2AK119Ub nucleosome complex / Type: COMPLEX / Entity ID: #1-#4, #7-#10 / Source: RECOMBINANT
Molecular weightValue: 0.29 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: 3.05 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 195091 / 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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