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- PDB-9dry: CHIP U-box dimer bound to Fab 2F1 -

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Basic information

Entry
Database: PDB / ID: 9dry
TitleCHIP U-box dimer bound to Fab 2F1
Components
  • 2F1 Fab heavy chain
  • 2F1 Fab light chain
  • E3 ubiquitin-protein ligase CHIP
KeywordsLIGASE/IMMUNE SYSTEM / E3 Ubiquitin Ligase / Fab / Epitope / Ubiquitination Inhibition / LIGASE / LIGASE-IMMUNE SYSTEM complex
Function / homology
Function and homology information


positive regulation of chaperone-mediated protein complex assembly / regulation of glucocorticoid metabolic process / negative regulation of vascular associated smooth muscle contraction / negative regulation of peroxisome proliferator activated receptor signaling pathway / ubiquitin conjugating enzyme complex / positive regulation of ERAD pathway / positive regulation of mitophagy / positive regulation of smooth muscle cell apoptotic process / ERBB2 signaling pathway / negative regulation of cardiac muscle hypertrophy ...positive regulation of chaperone-mediated protein complex assembly / regulation of glucocorticoid metabolic process / negative regulation of vascular associated smooth muscle contraction / negative regulation of peroxisome proliferator activated receptor signaling pathway / ubiquitin conjugating enzyme complex / positive regulation of ERAD pathway / positive regulation of mitophagy / positive regulation of smooth muscle cell apoptotic process / ERBB2 signaling pathway / negative regulation of cardiac muscle hypertrophy / nuclear inclusion body / misfolded protein binding / cellular response to misfolded protein / protein folding chaperone complex / RIPK1-mediated regulated necrosis / ubiquitin-ubiquitin ligase activity / SMAD binding / protein quality control for misfolded or incompletely synthesized proteins / negative regulation of smooth muscle cell apoptotic process / TPR domain binding / R-SMAD binding / positive regulation of proteolysis / protein K63-linked ubiquitination / protein monoubiquitination / ubiquitin ligase complex / endoplasmic reticulum unfolded protein response / protein autoubiquitination / ERAD pathway / heat shock protein binding / Hsp70 protein binding / Downregulation of TGF-beta receptor signaling / positive regulation of protein ubiquitination / response to ischemia / Regulation of TNFR1 signaling / Hsp90 protein binding / negative regulation of transforming growth factor beta receptor signaling pathway / G protein-coupled receptor binding / regulation of protein stability / RING-type E3 ubiquitin transferase / Regulation of necroptotic cell death / tau protein binding / Z disc / kinase binding / Downregulation of ERBB2 signaling / Regulation of PTEN stability and activity / protein polyubiquitination / ubiquitin-protein transferase activity / Regulation of RUNX2 expression and activity / ubiquitin protein ligase activity / MAPK cascade / Antigen processing: Ubiquitination & Proteasome degradation / positive regulation of proteasomal ubiquitin-dependent protein catabolic process / protein-folding chaperone binding / cellular response to heat / ubiquitin-dependent protein catabolic process / protein-macromolecule adaptor activity / cellular response to hypoxia / proteasome-mediated ubiquitin-dependent protein catabolic process / protein stabilization / protein ubiquitination / DNA repair / ubiquitin protein ligase binding / enzyme binding / endoplasmic reticulum / protein homodimerization activity / mitochondrion / nucleoplasm / nucleus / cytosol / cytoplasm
Similarity search - Function
CHIP, N-terminal tetratricopeptide repeat domain / CHIP/LubX , U box domain / CHIP N-terminal tetratricopeptide repeat domain / Anaphase-promoting complex, cyclosome, subunit 3 / U-box domain / U-box domain profile. / Modified RING finger domain / U-box domain / TPR repeat region circular profile. / TPR repeat profile. ...CHIP, N-terminal tetratricopeptide repeat domain / CHIP/LubX , U box domain / CHIP N-terminal tetratricopeptide repeat domain / Anaphase-promoting complex, cyclosome, subunit 3 / U-box domain / U-box domain profile. / Modified RING finger domain / U-box domain / TPR repeat region circular profile. / TPR repeat profile. / Tetratricopeptide repeats / Tetratricopeptide repeat / Tetratricopeptide-like helical domain superfamily / Zinc finger, RING/FYVE/PHD-type
Similarity search - Domain/homology
E3 ubiquitin-protein ligase CHIP
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 7.02 Å
AuthorsUnnikrishnan, A. / Southworth, D.
Funding support1items
OrganizationGrant numberCountry
Other private
CitationJournal: J Biol Chem / Year: 2025
Title: Recombinant antibodies inhibit enzymatic activity of the E3 ubiquitin ligase CHIP via multiple mechanisms.
Authors: Dong Hee Chung / Emily J Connelly / Aparna Unnikrishnan / Shih-Wei Chuo / Kristin Wucherer / Cory M Nadel / Jason E Gestwicki / Daniel R Southworth / Charles S Craik /
Abstract: Carboxyl-terminus of Hsp70-Interacting Protein (CHIP) is an E3 ubiquitin ligase that marks misfolded substrates for degradation. Hyper-activation of CHIP has been implicated in multiple diseases, ...Carboxyl-terminus of Hsp70-Interacting Protein (CHIP) is an E3 ubiquitin ligase that marks misfolded substrates for degradation. Hyper-activation of CHIP has been implicated in multiple diseases, including cystic fibrosis and cancer, suggesting that it may be a potential drug target. However, there are few tools available for exploring this possibility. Moreover, the best ways of inhibiting CHIP's function are not obvious, as this complex protein is composed of a tetratricopeptide repeat (TPR) domain, a U-box domain, and a coiled-coil domain that mediates homodimerization. To probe the structure and function of CHIP, we report an antibody panning campaign that yielded six recombinant Fabs with affinity for CHIP. Interestingly, these antibodies varied in their binding site(s) and impact on CHIP function, such as inhibiting TPR interactions, autoubiquitination, and/or substrate ubiquitination. Of particular interest, antibody 2F1 nearly eliminated substrate binding (IC = 2.7 μM) and limited ubiquitination and autoubiquitination. Cryo-electron microscopy of the 2F1:CHIP complex revealed a 2:1 binding mode (Fab:CHIP dimer), with 2F1 bound to the U-box domain and simultaneously displacing the TPR domain. Together, these studies provide insight into ways of inhibiting CHIP's activity and provide a series of new probes for exploring the function of this important E3 ubiquitin ligase.
History
DepositionSep 26, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 12, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: E3 ubiquitin-protein ligase CHIP
E: 2F1 Fab heavy chain
F: 2F1 Fab light chain
B: E3 ubiquitin-protein ligase CHIP
G: 2F1 Fab heavy chain
H: 2F1 Fab light chain


Theoretical massNumber of molelcules
Total (without water)109,9776
Polymers109,9776
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 CHIP / Antigen NY-CO-7 / CLL-associated antigen KW-8 / Carboxy terminus of Hsp70-interacting protein / ...Antigen NY-CO-7 / CLL-associated antigen KW-8 / Carboxy terminus of Hsp70-interacting protein / RING-type E3 ubiquitin transferase CHIP / STIP1 homology and U box-containing protein 1


Mass: 8626.804 Da / Num. of mol.: 2 / Fragment: U-box domain
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: STUB1, CHIP, PP1131 / Production host: Escherichia coli BL21(DE3) (bacteria)
References: UniProt: Q9UNE7, RING-type E3 ubiquitin transferase
#2: Antibody 2F1 Fab heavy chain


Mass: 23432.230 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Escherichia coli BL21(DE3) (bacteria)
#3: Antibody 2F1 Fab light chain


Mass: 22929.486 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Escherichia coli BL21(DE3) (bacteria)
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: CHIP U-box dimer bound to Fab 2F1 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 %
Details: Wait time 10 sec, blot time 3 sec, blot force 0, Graphene Oxide coated grids

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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: 1800 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 66 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 7.02 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 16310 / Symmetry type: POINT

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