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- PDB-9v33: Calypso/Asx/NCP-ub complex -

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Basic information

Entry
Database: PDB / ID: 9v33
TitleCalypso/Asx/NCP-ub complex
Components
  • (DNA (147-MER)) x 2
  • Histone H2A
  • Histone H2B
  • Histone H3
  • Histone H4
  • Polycomb group protein Asx
  • Polyubiquitin-B
  • Ubiquitin carboxyl-terminal hydrolase calypso
KeywordsTRANSCRIPTION/DNA / PR-DUB / Calypso / Polycomb / TRANSCRIPTION-DNA complex
Function / homology
Function and homology information


antennal development / apposition of dorsal and ventral imaginal disc-derived wing surfaces / specification of segmental identity, abdomen / sex comb development / PR-DUB complex / syncytial blastoderm mitotic cell cycle / UCH proteinases / cell fate determination / deubiquitinase activator activity / hypothalamus gonadotrophin-releasing hormone neuron development ...antennal development / apposition of dorsal and ventral imaginal disc-derived wing surfaces / specification of segmental identity, abdomen / sex comb development / PR-DUB complex / syncytial blastoderm mitotic cell cycle / UCH proteinases / cell fate determination / deubiquitinase activator activity / hypothalamus gonadotrophin-releasing hormone neuron development / anterior/posterior axis specification / female meiosis I / positive regulation of protein monoubiquitination / fat pad development / mitochondrion transport along microtubule / female gonad development / seminiferous tubule development / male meiosis I / positive regulation of intrinsic apoptotic signaling pathway by p53 class mediator / energy homeostasis / neuron projection morphogenesis / regulation of proteasomal protein catabolic process / Maturation of protein E / Maturation of protein E / ER Quality Control Compartment (ERQC) / Myoclonic epilepsy of Lafora / FLT3 signaling by CBL mutants / IRAK2 mediated activation of TAK1 complex / Prevention of phagosomal-lysosomal fusion / Alpha-protein kinase 1 signaling pathway / Glycogen synthesis / IRAK1 recruits IKK complex / IRAK1 recruits IKK complex upon TLR7/8 or 9 stimulation / Endosomal Sorting Complex Required For Transport (ESCRT) / Membrane binding and targetting of GAG proteins / Negative regulation of FLT3 / Regulation of TBK1, IKKε (IKBKE)-mediated activation of IRF3, IRF7 / PTK6 Regulates RTKs and Their Effectors AKT1 and DOK1 / Regulation of TBK1, IKKε-mediated activation of IRF3, IRF7 upon TLR3 ligation / Constitutive Signaling by NOTCH1 HD Domain Mutants / IRAK2 mediated activation of TAK1 complex upon TLR7/8 or 9 stimulation / NOTCH2 Activation and Transmission of Signal to the Nucleus / TICAM1,TRAF6-dependent induction of TAK1 complex / TICAM1-dependent activation of IRF3/IRF7 / APC/C:Cdc20 mediated degradation of Cyclin B / Regulation of FZD by ubiquitination / Downregulation of ERBB4 signaling / APC-Cdc20 mediated degradation of Nek2A / p75NTR recruits signalling complexes / epigenetic regulation of gene expression / InlA-mediated entry of Listeria monocytogenes into host cells / TRAF6 mediated IRF7 activation in TLR7/8 or 9 signaling / Regulation of pyruvate metabolism / NF-kB is activated and signals survival / TRAF6-mediated induction of TAK1 complex within TLR4 complex / regulation of neuron apoptotic process / Pexophagy / Regulation of innate immune responses to cytosolic DNA / Downregulation of ERBB2:ERBB3 signaling / NRIF signals cell death from the nucleus / Regulation of PTEN localization / VLDLR internalisation and degradation / Activated NOTCH1 Transmits Signal to the Nucleus / Synthesis of active ubiquitin: roles of E1 and E2 enzymes / positive regulation of protein ubiquitination / animal organ morphogenesis / TICAM1, RIP1-mediated IKK complex recruitment / Translesion synthesis by REV1 / Regulation of BACH1 activity / MAP3K8 (TPL2)-dependent MAPK1/3 activation / Translesion synthesis by POLK / InlB-mediated entry of Listeria monocytogenes into host cell / JNK (c-Jun kinases) phosphorylation and activation mediated by activated human TAK1 / Activation of IRF3, IRF7 mediated by TBK1, IKKε (IKBKE) / Downregulation of TGF-beta receptor signaling / Josephin domain DUBs / Translesion synthesis by POLI / IKK complex recruitment mediated by RIP1 / Regulation of activated PAK-2p34 by proteasome mediated degradation / Gap-filling DNA repair synthesis and ligation in GG-NER / PINK1-PRKN Mediated Mitophagy / regulation of mitochondrial membrane potential / TGF-beta receptor signaling in EMT (epithelial to mesenchymal transition) / TNFR1-induced NF-kappa-B signaling pathway / Autodegradation of Cdh1 by Cdh1:APC/C / TCF dependent signaling in response to WNT / APC/C:Cdc20 mediated degradation of Securin / Regulation of NF-kappa B signaling / N-glycan trimming in the ER and Calnexin/Calreticulin cycle / activated TAK1 mediates p38 MAPK activation / Asymmetric localization of PCP proteins / Ubiquitin-dependent degradation of Cyclin D / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / Regulation of signaling by CBL / TNFR2 non-canonical NF-kB pathway / AUF1 (hnRNP D0) binds and destabilizes mRNA / NOTCH3 Activation and Transmission of Signal to the Nucleus / Negative regulators of DDX58/IFIH1 signaling / Assembly of the pre-replicative complex
Similarity search - Function
Polycomb protein ASX/ASX-like / Protein ASX-like, PHD domain / ASX, DEUBAD domain / Asx homology domain / PHD domain of transcriptional enhancer, Asx / UCH37-like (ULD) domain profile. / Peptidase C12, C-terminal domain / Ubiquitin carboxyl-terminal hydrolases / DEUBAD domain / DEUBAD (DEUBiquitinase ADaptor) domain profile. ...Polycomb protein ASX/ASX-like / Protein ASX-like, PHD domain / ASX, DEUBAD domain / Asx homology domain / PHD domain of transcriptional enhancer, Asx / UCH37-like (ULD) domain profile. / Peptidase C12, C-terminal domain / Ubiquitin carboxyl-terminal hydrolases / DEUBAD domain / DEUBAD (DEUBiquitinase ADaptor) domain profile. / Peptidase C12, ubiquitin carboxyl-terminal hydrolase superfamily / Ubiquitin carboxyl-terminal hydrolase, family 1 / Ubiquitin carboxyl-terminal hydrolase (UCH) catalytic domain profile. / Peptidase C12, ubiquitin carboxyl-terminal hydrolase / Papain-like cysteine peptidase superfamily / : / Histone H2A conserved site / Histone H2A signature. / Histone H2B 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 H3 / Histone H2B / Polyubiquitin-B / Histone H4 / Histone H2A / Ubiquitin carboxyl-terminal hydrolase calypso / Polycomb group protein Asx
Similarity search - Component
Biological speciesXenopus laevis (African clawed frog)
Drosophila melanogaster (fruit fly)
Homo sapiens (human)
Escherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 5.9 Å
AuthorsWang, C. / He, J.
Funding support China, 8items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32361163669 China
National Natural Science Foundation of China (NSFC)32170189 China
National Natural Science Foundation of China (NSFC)32241021 China
Other government2023B1212060050
Other government2023B1212120009
Other government2023M743512
Other governmentGZC20232691
Other government2023A1515110923
CitationJournal: iScience / Year: 2026
Title: Structural basis of nucleosome deubiquitination by the bidentate Calypso/Asx complex.
Authors: Chi Wang / Fahui Sun / Heyu Zhao / Nan Zhang / Jiali Guan / Yuxing Zhou / Wentong Shuai / Hui Zheng / Jun He /
Abstract: The Polycomb repressive complex 1 (PRC1) and PR-DUB constitute a canonical pair of histone-modifying enzymes that deposit and remove monoubiquitinated H2A at lysine 119 (H2AK119ub1), serving as a ...The Polycomb repressive complex 1 (PRC1) and PR-DUB constitute a canonical pair of histone-modifying enzymes that deposit and remove monoubiquitinated H2A at lysine 119 (H2AK119ub1), serving as a model of dynamic epigenetic regulation. In humans, PR-DUB, composed of BAP1 and ASXL1, functions as a monomeric complex, while the homolog Calypso/Asx forms a bidentate dimer (Calypso: Asx) with an unclear chromatin engagement mechanism. Here, we present its cryo-EM structure bound to a nucleosome, revealing the molecular basis of interaction. Surprisingly, only one Calypso/Asx unit engages the nucleosome in a conformation similar to human BAP1/ASXL1, while the second remains disengaged. Structural and biochemical analysis of the positively charged Calypso C terminus suggests a "spreading" potential of the bidentate complex along chromatin, which was validated using nucleosome arrays. These findings support a model in which the bidentate Calypso/Asx complex enables processive deubiquitination along chromatin via alternating or cooperative engagement.
History
DepositionMay 21, 2025Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Mar 18, 2026Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Histone H3
B: Histone H4
C: Histone H2A
D: Histone H2B
E: Histone H3
F: Histone H4
G: Histone H2A
H: Histone H2B
I: DNA (147-MER)
J: DNA (147-MER)
K: Ubiquitin carboxyl-terminal hydrolase calypso
L: Polycomb group protein Asx
M: Polyubiquitin-B
N: Ubiquitin carboxyl-terminal hydrolase calypso
O: Polycomb group protein Asx


Theoretical massNumber of molelcules
Total (without water)396,37015
Polymers396,37015
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Protein , 7 types, 13 molecules AEBFCGDHKNLOM

#1: Protein Histone H3


Mass: 15435.126 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Gene: LOC121398065, LOC108703785, LOC121398067 / Production host: Escherichia coli (E. coli) / References: UniProt: A0A310TTQ1
#2: Protein Histone H4


Mass: 11394.426 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Production host: Escherichia coli (E. coli) / References: UniProt: P62799
#3: Protein Histone H2A


Mass: 14297.685 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Gene: LOC494591, h2ac14.L, hist1h2aj, hist1h2aj.L / Production host: Escherichia coli (E. coli) / References: UniProt: Q6AZJ8
#4: Protein Histone H2B


Mass: 13655.948 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Gene: LOC108704303 / Production host: Escherichia coli (E. coli) / References: UniProt: A0A8J0U496
#7: Protein Ubiquitin carboxyl-terminal hydrolase calypso / BRCA1-associated protein 1 homolog / BAP1 homolog / Polycomb group protein calypso


Mass: 55928.809 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Drosophila melanogaster (fruit fly) / Gene: caly, BAP1, CG8445 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: Q7K5N4, ubiquitinyl hydrolase 1
#8: Protein Polycomb group protein Asx / Protein additional sex combs


Mass: 37097.965 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Drosophila melanogaster (fruit fly) / Gene: Asx, CG8787 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: Q9V727
#9: Protein Polyubiquitin-B


Mass: 10001.402 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: P0CG47

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DNA chain , 2 types, 2 molecules IJ

#5: DNA chain DNA (147-MER)


Mass: 45178.797 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Escherichia coli (E. coli)
#6: DNA chain DNA (147-MER)


Mass: 45570.020 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) 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: Ternary complex of Calypso/Asx/NCP-ub / Type: COMPLEX / Entity ID: all / Source: MULTIPLE SOURCES
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Source (recombinant)Organism: Trichoplusia ni (cabbage looper)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: NITROGEN

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2400 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.2.1particle selection
13cryoSPARC4.2.13D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 5.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 27764 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 210.73 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.002817347
ELECTRON MICROSCOPYf_angle_d0.582124574
ELECTRON MICROSCOPYf_chiral_restr0.03712793
ELECTRON MICROSCOPYf_plane_restr0.00462202
ELECTRON MICROSCOPYf_dihedral_angle_d28.97534195

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