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- PDB-8j1p: Cryo-EM structure of Ufd4 in complex with K29/48 triUb -

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Basic information

Entry
Database: PDB / ID: 8j1p
TitleCryo-EM structure of Ufd4 in complex with K29/48 triUb
Components
  • (Ubiquitin) x 2
  • Ubiquitin fusion degradation protein 4
KeywordsLYASE / Ufd4 / HECT / E3 / K29/48
Function / homology
Function and homology information


proteasome regulatory particle binding / protein K29-linked ubiquitination / free ubiquitin chain polymerization / HECT-type E3 ubiquitin transferase / Transferases; Acyltransferases; Aminoacyltransferases / hypothalamus gonadotrophin-releasing hormone neuron development / female meiosis I / positive regulation of protein monoubiquitination / fat pad development / mitochondrion transport along microtubule ...proteasome regulatory particle binding / protein K29-linked ubiquitination / free ubiquitin chain polymerization / HECT-type E3 ubiquitin transferase / Transferases; Acyltransferases; Aminoacyltransferases / hypothalamus gonadotrophin-releasing hormone neuron development / female meiosis I / positive regulation of protein monoubiquitination / fat pad development / mitochondrion transport along microtubule / female gonad development / seminiferous tubule development / male meiosis I / Antigen processing: Ubiquitination & Proteasome degradation / positive regulation of intrinsic apoptotic signaling pathway by p53 class mediator / energy homeostasis / regulation of neuron apoptotic process / 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 / Downregulation of ERBB4 signaling / Regulation of FZD by ubiquitination / APC-Cdc20 mediated degradation of Nek2A / p75NTR recruits signalling complexes / InlA-mediated entry of Listeria monocytogenes into host cells / TRAF6 mediated IRF7 activation in TLR7/8 or 9 signaling / TRAF6-mediated induction of TAK1 complex within TLR4 complex / Regulation of pyruvate metabolism / NF-kB is activated and signals survival / Regulation of innate immune responses to cytosolic DNA / Pexophagy / Downregulation of ERBB2:ERBB3 signaling / NRIF signals cell death from the nucleus / VLDLR internalisation and degradation / Regulation of PTEN localization / Activated NOTCH1 Transmits Signal to the Nucleus / Regulation of BACH1 activity / Synthesis of active ubiquitin: roles of E1 and E2 enzymes / MAP3K8 (TPL2)-dependent MAPK1/3 activation / Translesion synthesis by REV1 / TICAM1, RIP1-mediated IKK complex recruitment / Translesion synthesis by POLK / InlB-mediated entry of Listeria monocytogenes into host cell / Activation of IRF3, IRF7 mediated by TBK1, IKKε (IKBKE) / JNK (c-Jun kinases) phosphorylation and activation mediated by activated human TAK1 / Downregulation of TGF-beta receptor signaling / Josephin domain DUBs / positive regulation of protein ubiquitination / Translesion synthesis by POLI / Gap-filling DNA repair synthesis and ligation in GG-NER / IKK complex recruitment mediated by RIP1 / Regulation of activated PAK-2p34 by proteasome mediated degradation / PINK1-PRKN Mediated Mitophagy / TGF-beta receptor signaling in EMT (epithelial to mesenchymal transition) / TNFR1-induced NF-kappa-B signaling pathway / regulation of mitochondrial membrane potential / 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 / Asymmetric localization of PCP proteins / activated TAK1 mediates p38 MAPK activation / Ubiquitin-dependent degradation of Cyclin D / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / TNFR2 non-canonical NF-kB pathway / AUF1 (hnRNP D0) binds and destabilizes mRNA / Regulation of signaling by CBL / NOTCH3 Activation and Transmission of Signal to the Nucleus / Negative regulators of DDX58/IFIH1 signaling / Vpu mediated degradation of CD4 / Assembly of the pre-replicative complex / Ubiquitin-Mediated Degradation of Phosphorylated Cdc25A / Negative regulation of FGFR3 signaling / Deactivation of the beta-catenin transactivating complex / Fanconi Anemia Pathway / Peroxisomal protein import
Similarity search - Function
E3 ubiquitin-protein ligase HECTD1/TRIP12-like / HECT domain / HECT, E3 ligase catalytic domain / HECT-domain (ubiquitin-transferase) / HECT domain profile. / Domain Homologous to E6-AP Carboxyl Terminus with / : / Ubiquitin domain signature. / Ubiquitin conserved site / Ubiquitin domain ...E3 ubiquitin-protein ligase HECTD1/TRIP12-like / HECT domain / HECT, E3 ligase catalytic domain / HECT-domain (ubiquitin-transferase) / HECT domain profile. / Domain Homologous to E6-AP Carboxyl Terminus with / : / Ubiquitin domain signature. / Ubiquitin conserved site / Ubiquitin domain / Armadillo-like helical / Ubiquitin family / Ubiquitin homologues / Ubiquitin domain profile. / Ubiquitin-like domain / Armadillo-type fold / Ubiquitin-like domain superfamily
Similarity search - Domain/homology
Polyubiquitin-B / Ubiquitin fusion degradation protein 4
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.31 Å
AuthorsAi, H.S. / Mao, J.X. / Wu, X.W. / Pan, M. / Liu, L.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Nat Commun / Year: 2025
Title: Structural visualization of HECT-type E3 ligase Ufd4 accepting and transferring ubiquitin to form K29/K48-branched polyubiquitination.
Authors: Xiangwei Wu / Huasong Ai / Junxiong Mao / Hongyi Cai / Lu-Jun Liang / Zebin Tong / Zhiheng Deng / Qingyun Zheng / Lei Liu / Man Pan /
Abstract: The K29/K48-linked ubiquitination generated by the cooperative catalysis of E3 ligase Ufd4 and Ubr1 is an enhanced protein degradation signal, in which Ufd4 is responsible for introducing K29-linked ...The K29/K48-linked ubiquitination generated by the cooperative catalysis of E3 ligase Ufd4 and Ubr1 is an enhanced protein degradation signal, in which Ufd4 is responsible for introducing K29-linked ubiquitination to K48-linked ubiquitin chains to augment polyubiquitination. How HECT-E3 ligase Ufd4 mediates the ubiquitination event remains unclear. Here, we biochemically determine that Ufd4 preferentially catalyses K29-linked ubiquitination on K48-linked ubiquitin chains to generate K29/K48-branched ubiquitin chains and capture structural snapshots of Ub transfer cascades for Ufd4-mediated ubiquitination. The N-terminal ARM region and HECT domain C-lobe of Ufd4 are identified and characterized as key structural elements that together recruit K48-linked diUb and orient Lys29 of its proximal Ub to the active cysteine of Ufd4 for K29-linked branched ubiquitination. These structures not only provide mechanistic insights into the architecture of the Ufd4 complex but also provide structural visualization of branched ubiquitin chain formation by a HECT-type E3 ligase.
History
DepositionApr 13, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Apr 17, 2024Provider: repository / Type: Initial release
Revision 1.0Apr 17, 2024Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.1Jun 25, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jun 25, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / 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: Ubiquitin fusion degradation protein 4
C: Ubiquitin
D: Ubiquitin
E: Ubiquitin


Theoretical massNumber of molelcules
Total (without water)193,7304
Polymers193,7304
Non-polymers00
Water00
1


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

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Components

#1: Protein Ubiquitin fusion degradation protein 4 / UB fusion protein 4 / HECT-type E3 ubiquitin transferase UFD4


Mass: 168026.031 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: UFD4, YKL010C, YKL162 / Production host: Saccharomyces cerevisiae BY4741 (yeast)
References: UniProt: P33202, Transferases; Acyltransferases; Aminoacyltransferases, HECT-type E3 ubiquitin transferase
#2: Protein Ubiquitin


Mass: 8576.831 Da / Num. of mol.: 2
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
#3: Protein Ubiquitin


Mass: 8550.794 Da / Num. of mol.: 1 / Mutation: K29C
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
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

Component
IDNameTypeEntity IDParent-IDSource
1Complex of Ufd4 in complex with K29/48 TriUbCOMPLEXall0RECOMBINANT
2Ufd4COMPLEX#11RECOMBINANT
3UbCOMPLEX#2-#31RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
23Homo sapiens (human)9606
32Saccharomyces cerevisiae (brewer's yeast)4932
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-IDStrain
23Escherichia coli (E. coli)562
32Saccharomyces cerevisiae BY4741 (yeast)1247190BY4741
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: 2000 nm / Nominal defocus min: 1500 nm
Image recordingElectron dose: 43.3 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.31 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 172037 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00311709
ELECTRON MICROSCOPYf_angle_d0.74615817
ELECTRON MICROSCOPYf_dihedral_angle_d5.6331545
ELECTRON MICROSCOPYf_chiral_restr0.0451864
ELECTRON MICROSCOPYf_plane_restr0.0042011

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