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- PDB-9nwd: Human E3 ligase UBR4-KCMF1-calmodulin complex (N-terminal) -

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Basic information

Entry
Database: PDB / ID: 9nwd
TitleHuman E3 ligase UBR4-KCMF1-calmodulin complex (N-terminal)
ComponentsE3 ubiquitin-protein ligase UBR4
KeywordsLIGASE / E3 ligase / UBR4
Function / homology
Function and homology information


negative regulation of HRI-mediated signaling / ubiquitin-dependent protein catabolic process via the N-end rule pathway / protein K27-linked ubiquitination / cytoplasm protein quality control by the ubiquitin-proteasome system / protein branched polyubiquitination / negative regulation of fatty acid biosynthetic process / endosome organization / cytoplasm protein quality control / protein K11-linked ubiquitination / tertiary granule membrane ...negative regulation of HRI-mediated signaling / ubiquitin-dependent protein catabolic process via the N-end rule pathway / protein K27-linked ubiquitination / cytoplasm protein quality control by the ubiquitin-proteasome system / protein branched polyubiquitination / negative regulation of fatty acid biosynthetic process / endosome organization / cytoplasm protein quality control / protein K11-linked ubiquitination / tertiary granule membrane / ficolin-1-rich granule membrane / protein K48-linked ubiquitination / specific granule membrane / positive regulation of autophagy / RING-type E3 ubiquitin transferase / ubiquitin-protein transferase activity / ubiquitin protein ligase activity / Antigen processing: Ubiquitination & Proteasome degradation / ubiquitin-dependent protein catabolic process / response to oxidative stress / proteasome-mediated ubiquitin-dependent protein catabolic process / calmodulin binding / endosome / protein stabilization / centrosome / Neutrophil degranulation / zinc ion binding / nucleoplasm / membrane / plasma membrane / cytosol / cytoplasm
Similarity search - Function
E3 ubiquitin-protein ligase UBR4, N-terminal / : / E3 ubiquitin-protein ligase UBR4 N-terminal / UBR4 E3 catalytic module profile. / E3 ubiquitin ligase UBR4, C-terminal / E3 ubiquitin ligase UBR4-like / E3 ubiquitin-protein ligase UBR4 / Putative zinc finger in N-recognin (UBR box) / Zinc finger, UBR-type / Zinc finger UBR-type profile. ...E3 ubiquitin-protein ligase UBR4, N-terminal / : / E3 ubiquitin-protein ligase UBR4 N-terminal / UBR4 E3 catalytic module profile. / E3 ubiquitin ligase UBR4, C-terminal / E3 ubiquitin ligase UBR4-like / E3 ubiquitin-protein ligase UBR4 / Putative zinc finger in N-recognin (UBR box) / Zinc finger, UBR-type / Zinc finger UBR-type profile. / Putative zinc finger in N-recognin, a recognition component of the N-end rule pathway / Armadillo-type fold / WD40-repeat-containing domain superfamily
Similarity search - Domain/homology
E3 ubiquitin-protein ligase UBR4
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsYang, Z. / Haakonsen, D.L. / Heider, M. / Witus, S.R. / Zelter, A. / Beschauner, T. / MacCoss, M.J. / Rape, M.
Funding support United States, 2items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
The G. Harold and Leila Y. Mathers Foundation United States
CitationJournal: Nature / Year: 2025
Title: Molecular basis of SIFI activity in the integrated stress response.
Authors: Zhi Yang / Diane L Haakonsen / Michael Heider / Samuel R Witus / Alex Zelter / Tobias Beschauner / Michael J MacCoss / Michael Rapé /
Abstract: Chronic stress response activation impairs cell survival and causes devastating degenerative diseases. Organisms accordingly deploy silencing factors, such as the E3 ubiquitin ligase silencing factor ...Chronic stress response activation impairs cell survival and causes devastating degenerative diseases. Organisms accordingly deploy silencing factors, such as the E3 ubiquitin ligase silencing factor of the integrated stress response (SIFI), to terminate stress response signalling and ensure cellular homeostasis. How a silencing factor can sense stress across cellular scales to elicit timely stress response inactivation is poorly understood. Here we combine cryo-electron microscopy analysis of endogenous SIFI with AlphaFold modelling and biochemical studies to report the structural and mechanistic basis of the silencing of the integrated stress response. SIFI detects both stress indicators and stress response components through flexible domains within an easily accessible scaffold, before building linkage-specific ubiquitin chains at separate, sterically restricted elongation modules. Ubiquitin handover by a ubiquitin-like domain couples versatile substrate modification to linkage-specific ubiquitin polymer formation. Stress response silencing therefore exploits a catalytic mechanism that is geared towards processing many diverse proteins and therefore allows a single enzyme to monitor and, if needed, modulate a complex cellular state.
History
DepositionMar 22, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jun 11, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: E3 ubiquitin-protein ligase UBR4
B: E3 ubiquitin-protein ligase UBR4


Theoretical massNumber of molelcules
Total (without water)1,148,9252
Polymers1,148,9252
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

#1: Protein E3 ubiquitin-protein ligase UBR4 / 600 kDa retinoblastoma protein-associated factor / p600 / N-recognin-4 / Retinoblastoma-associated ...600 kDa retinoblastoma protein-associated factor / p600 / N-recognin-4 / Retinoblastoma-associated factor of 600 kDa / RBAF600


Mass: 574462.312 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human)
References: UniProt: Q5T4S7, RING-type E3 ubiquitin transferase
Has protein modificationY

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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: Human E3 ligase UBR4-KCMF1-calmodulin complex (N-terminal)
Type: COMPLEX / Entity ID: all / Source: NATURAL
Molecular weightValue: 1.26 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid type: Quantifoil R1.2/1.3
VitrificationCryogen name: ETHANE / Humidity: 100 %

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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: 2200 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 126259 / Symmetry type: POINT

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