6NSV

Crystal structure of the human CHIP TPR domain in complex with a 5mer acetylated optimized peptide

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.215 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history. 


Literature

Specificity for latent C termini links the E3 ubiquitin ligase CHIP to caspases.

Ravalin, M., Theofilas, P., Basu, K., Opoku-Nsiah, K.A., Assimon, V.A., Medina-Cleghorn, D., Chen, Y.F., Bohn, M.F., Arkin, M., Grinberg, L.T., Craik, C.S., Gestwicki, J.E.

(2019) Nat Chem Biol 15: 786-794

  • DOI: 10.1038/s41589-019-0322-6
  • Primary Citation of Related Structures:  
    6EFK, 6NSV

  • PubMed Abstract: 

    • Protein-protein interactions between E3 ubiquitin ligases and protein termini help shape the proteome. These interactions are sensitive to proteolysis, which alters the ensemble of cellular N and C termini. Here we describe a mechanism wherein caspase activity reveals latent C termini that are then recognized by the E3 ubiquitin ligase CHIP ...

    Protein-protein interactions between E3 ubiquitin ligases and protein termini help shape the proteome. These interactions are sensitive to proteolysis, which alters the ensemble of cellular N and C termini. Here we describe a mechanism wherein caspase activity reveals latent C termini that are then recognized by the E3 ubiquitin ligase CHIP. Using expanded knowledge of CHIP's binding specificity, we predicted hundreds of putative interactions arising from caspase activity. Subsequent validation experiments confirmed that CHIP binds the latent C termini at tau D421 and caspase-6 D179 . CHIP binding to tau D421 , but not tau FL , promoted its ubiquitination, while binding to caspase-6 D179 mediated ubiquitin-independent inhibition. Given that caspase activity generates tau D421 in Alzheimer's disease (AD), these results suggested a concise model for CHIP regulation of tau homeostasis. Indeed, we find that loss of CHIP expression in AD coincides with the accumulation of tau D421 and caspase-6 D179 . These results illustrate an unanticipated link between caspases and protein homeostasis.

    Organizational Affiliation: 

    Sandler Neuroscience Center, University of California at San Francisco, San Francisco, CA, USA. Jason.Gestwicki@ucsf.edu.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
E3 ubiquitin-protein ligase CHIPA, B130Homo sapiensMutation(s): 0 
Gene Names: STUB1, CHIP, PP1131
EC: 2.3.2.27
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UNE7 (Homo sapiens)
Explore Q9UNE7 
Go to UniProtKB:  Q9UNE7
PHAROS:  Q9UNE7
GTEx:  ENSG00000103266
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ACE-LEU-TRP-TRP-PRO-ASPC, D6synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1PE
Query on 1PE
Download Ideal Coordinates CCD File 
G [auth A], I [auth B]PENTAETHYLENE GLYCOL
C10 H22 O6
JLFNLZLINWHATN-UHFFFAOYSA-N		 Ligand Interaction
CL
Query on CL
Download Ideal Coordinates CCD File 
E [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
NA
Query on NA
Download Ideal Coordinates CCD File 
F [auth A], H [auth B]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.215 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.219α = 90
b = 71.92β = 90
c = 77.79γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
Aimlessdata scaling
BALBESphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-31
    Type: Initial release