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- PDB-8gq6: Cryo-EM Structure of the KBTBD2-CUL3-Rbx1 dimeric complex -

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Basic information

Entry
Database: PDB / ID: 8gq6
TitleCryo-EM Structure of the KBTBD2-CUL3-Rbx1 dimeric complex
Components
  • Cullin-3
  • E3 ubiquitin-protein ligase RBX1
  • Kelch repeat and BTB domain-containing protein 2
KeywordsLIGASE / complex
Function / homology
Function and homology information


positive regulation of mitotic cell cycle phase transition / POZ domain binding / negative regulation of Rho protein signal transduction / embryonic cleavage / polar microtubule / anaphase-promoting complex-dependent catabolic process / nuclear protein quality control by the ubiquitin-proteasome system / regulation protein catabolic process at postsynapse / COPII vesicle coat assembly / cell projection organization ...positive regulation of mitotic cell cycle phase transition / POZ domain binding / negative regulation of Rho protein signal transduction / embryonic cleavage / polar microtubule / anaphase-promoting complex-dependent catabolic process / nuclear protein quality control by the ubiquitin-proteasome system / regulation protein catabolic process at postsynapse / COPII vesicle coat assembly / cell projection organization / RHOBTB3 ATPase cycle / negative regulation of beige fat cell differentiation / cullin-RING-type E3 NEDD8 transferase / NEDD8 transferase activity / stem cell division / negative regulation of mitophagy / cullin-RING ubiquitin ligase complex / regulation of xenophagy / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / positive regulation of mitotic metaphase/anaphase transition / cellular response to chemical stress / Cul7-RING ubiquitin ligase complex / regulation of cell cycle process / neural crest cell differentiation / RNA polymerase II transcription initiation surveillance / Notch binding / positive regulation of protein autoubiquitination / protein neddylation / stress fiber assembly / regulation of BMP signaling pathway / NEDD8 ligase activity / regulation of mitophagy / RHOBTB1 GTPase cycle / negative regulation of response to oxidative stress / regulation of centrosome duplication / protein K27-linked ubiquitination / VCB complex / Cul5-RING ubiquitin ligase complex / regulation of TOR signaling / ubiquitin-ubiquitin ligase activity / ubiquitin-dependent protein catabolic process via the C-end degron rule pathway / Cul2-RING ubiquitin ligase complex / SCF ubiquitin ligase complex / negative regulation of DNA-templated DNA replication / regulation of mitotic cytokinesis / Cul3-RING ubiquitin ligase complex / regulation of DNA damage checkpoint / negative regulation of type I interferon production / positive regulation of cytokinesis / regulation of miRNA-mediated gene silencing / regulation of natural killer cell activation / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / Prolactin receptor signaling / regulation of cell cycle phase transition / Cul4A-RING E3 ubiquitin ligase complex / Cul4-RING E3 ubiquitin ligase complex / regulation of stem cell population maintenance / Cul4B-RING E3 ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / negative regulation of adipose tissue development / regulation of cellular response to stress / limb development / protein monoubiquitination / cullin family protein binding / mitotic metaphase chromosome alignment / endoplasmic reticulum to Golgi vesicle-mediated transport / RHOBTB2 GTPase cycle / regulation of DNA-templated DNA replication initiation / centrosome duplication / sperm flagellum / protein autoubiquitination / cilium assembly / ubiquitin-like ligase-substrate adaptor activity / kidney development / intrinsic apoptotic signaling pathway / ribosome-associated ubiquitin-dependent protein catabolic process / signal transduction in response to DNA damage / negative regulation of insulin receptor signaling pathway / Nuclear events stimulated by ALK signaling in cancer / protein K48-linked ubiquitination / regulation of cellular response to insulin stimulus / positive regulation of TORC1 signaling / gene expression / transcription-coupled nucleotide-excision repair / post-translational protein modification / integrin-mediated signaling pathway / cellular response to amino acid stimulus / regulation of embryonic development / cyclin binding / replication fork processing / positive regulation of protein ubiquitination / negative regulation of canonical NF-kappaB signal transduction / regulation of mitotic cell cycle / site of DNA damage / Regulation of BACH1 activity / T cell activation / G1/S transition of mitotic cell cycle / negative regulation of canonical Wnt signaling pathway / epigenetic regulation of gene expression / protein destabilization
Similarity search - Function
Cullin; Chain C, Domain 2 / Kelch repeat and BTB domain-containing protein 2 / : / Kelch-type beta propeller / Zinc finger, RING-H2-type / RING-H2 zinc finger domain / BTB-kelch protein / BTB/Kelch-associated / BTB And C-terminal Kelch / BTB And C-terminal Kelch ...Cullin; Chain C, Domain 2 / Kelch repeat and BTB domain-containing protein 2 / : / Kelch-type beta propeller / Zinc finger, RING-H2-type / RING-H2 zinc finger domain / BTB-kelch protein / BTB/Kelch-associated / BTB And C-terminal Kelch / BTB And C-terminal Kelch / Potassium Channel Kv1.1; Chain A / Potassium Channel Kv1.1; Chain A / Kelch / Kelch motif / Kelch repeat type 1 / : / Cullin protein neddylation domain / Cullin, conserved site / Cullin family signature. / Cullin, N-terminal / Cullin repeat-like-containing domain superfamily / Cullin protein, neddylation domain / Cullin / Cullin protein neddylation domain / Cullin alpha solenoid domain / Cullin / : / Cullin alpha+beta domain / Cullin homology domain / Cullin homology domain superfamily / Cullin family profile. / Kelch-type beta propeller / Ribosomal Protein S5; domain 2 / 6 Propeller / Neuraminidase / BTB/POZ domain / BTB domain profile. / Broad-Complex, Tramtrack and Bric a brac / BTB/POZ domain / SKP1/BTB/POZ domain superfamily / Zinc finger RING-type profile. / Zinc finger, RING-type / Zinc finger, RING/FYVE/PHD-type / Winged helix DNA-binding domain superfamily / Winged helix-like DNA-binding domain superfamily / 2-Layer Sandwich / Mainly Beta / Alpha Beta
Similarity search - Domain/homology
E3 ubiquitin-protein ligase RBX1 / Cullin-3 / Kelch repeat and BTB domain-containing protein 2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.96 Å
AuthorsSun, L. / Chen, Z. / Hu, Y. / Mao, Q.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)81900729 China
CitationJournal: Nat Struct Mol Biol / Year: 2024
Title: Dynamic molecular architecture and substrate recruitment of cullin3-RING E3 ligase CRL3.
Authors: Yuxia Hu / Zhao Zhang / Qiyu Mao / Xiang Zhang / Aihua Hao / Yu Xun / Yeda Wang / Lin Han / Wuqiang Zhan / Qianying Liu / Yue Yin / Chao Peng / Eva Marie Y Moresco / Zhenguo Chen / Bruce Beutler / Lei Sun /
Abstract: Phosphatidylinositol 3-kinase α, a heterodimer of catalytic p110α and one of five regulatory subunits, mediates insulin- and insulin like growth factor-signaling and, frequently, oncogenesis. ...Phosphatidylinositol 3-kinase α, a heterodimer of catalytic p110α and one of five regulatory subunits, mediates insulin- and insulin like growth factor-signaling and, frequently, oncogenesis. Cellular levels of the regulatory p85α subunit are tightly controlled by regulated proteasomal degradation. In adipose tissue and growth plates, failure of K48-linked p85α ubiquitination causes diabetes, lipodystrophy and dwarfism in mice, as in humans with SHORT syndrome. Here we elucidated the structures of the key ubiquitin ligase complexes regulating p85α availability. Specificity is provided by the substrate receptor KBTBD2, which recruits p85α to the cullin3-RING E3 ubiquitin ligase (CRL3). CRL3 forms multimers, which disassemble into dimers upon substrate binding (CRL3-p85α) and/or neddylation by the activator NEDD8 (CRL3~N8), leading to p85α ubiquitination and degradation. Deactivation involves dissociation of NEDD8 mediated by the COP9 signalosome and displacement of KBTBD2 by the inhibitor CAND1. The hereby identified structural basis of p85α regulation opens the way to better understanding disturbances of glucose regulation, growth and cancer.
History
DepositionAug 29, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Sep 6, 2023Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Kelch repeat and BTB domain-containing protein 2
E: E3 ubiquitin-protein ligase RBX1
C: Cullin-3
B: Kelch repeat and BTB domain-containing protein 2
F: Cullin-3
D: E3 ubiquitin-protein ligase RBX1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)351,35212
Polymers350,9596
Non-polymers3926
Water00
1


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

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Components

#1: Protein Kelch repeat and BTB domain-containing protein 2


Mass: 71403.367 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q8IY47
#2: Protein E3 ubiquitin-protein ligase RBX1 / E3 ubiquitin-protein transferase RBX1 / Protein ZYP / RING finger protein 75 / RING-box protein 1 / ...E3 ubiquitin-protein transferase RBX1 / Protein ZYP / RING finger protein 75 / RING-box protein 1 / Rbx1 / Regulator of cullins 1 / ROC1


Mass: 13970.756 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: RBX1, RNF75, ROC1 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P62877, RING-type E3 ubiquitin transferase, cullin-RING-type E3 NEDD8 transferase
#3: Protein Cullin-3


Mass: 90105.469 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q13618
#4: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Zn
Has ligand of interestN
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: KBTBD2-CUL3-Rbx1 dimeric complex / Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.8
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: 2200 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 45 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20_4459: / Classification: refinement
EM software
IDNameVersionCategory
2SerialEMimage acquisition
8PHENIXmodel refinement
11RELION3final Euler assignment
13RELION33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.96 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 433329 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00222735
ELECTRON MICROSCOPYf_angle_d0.45830690
ELECTRON MICROSCOPYf_dihedral_angle_d3.7113006
ELECTRON MICROSCOPYf_chiral_restr0.0383385
ELECTRON MICROSCOPYf_plane_restr0.0033936

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