Human Hsp90 co-chaperone TTC4 C-domain

Experimental Data Snapshot

  • Resolution: 1.65 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.160 

wwPDB Validation   3D Report Full Report

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The Co-chaperone Cns1 and the Recruiter Protein Hgh1 Link Hsp90 to Translation Elongation via Chaperoning Elongation Factor 2.

Schopf, F.H.Huber, E.M.Dodt, C.Lopez, A.Biebl, M.M.Rutz, D.A.Muhlhofer, M.Richter, G.Madl, T.Sattler, M.Groll, M.Buchner, J.

(2019) Mol Cell 74: 73-87.e8

  • DOI: https://doi.org/10.1016/j.molcel.2019.02.011
  • Primary Citation of Related Structures:  
    6HFM, 6HFO, 6HFT

  • PubMed Abstract: 

    The Hsp90 chaperone machinery in eukaryotes comprises a number of distinct accessory factors. Cns1 is one of the few essential co-chaperones in yeast, but its structure and function remained unknown. Here, we report the X-ray structure of the Cns1 fold and NMR studies on the partly disordered, essential segment of the protein. We demonstrate that Cns1 is important for maintaining translation elongation, specifically chaperoning the elongation factor eEF2. In this context, Cns1 interacts with the novel co-factor Hgh1 and forms a quaternary complex together with eEF2 and Hsp90. The in vivo folding and solubility of eEF2 depend on the presence of these proteins. Chaperoning of eEF2 by Cns1 is essential for yeast viability and requires a defined subset of the Hsp90 machinery as well as the identified eEF2 recruiting factor Hgh1.

  • Organizational Affiliation

    Center for Integrated Protein Science at the Department Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tetratricopeptide repeat protein 4171Homo sapiensMutation(s): 0 
Gene Names: TTC4My044
UniProt & NIH Common Fund Data Resources
Find proteins for O95801 (Homo sapiens)
Explore O95801 
Go to UniProtKB:  O95801
PHAROS:  O95801
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO95801
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PO4

Download Ideal Coordinates CCD File 
O4 P
Experimental Data & Validation

Experimental Data

  • Resolution: 1.65 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.160 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.68α = 90
b = 42.8β = 93.63
c = 43.09γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Research FoundationGermanySFB1035/A02

Revision History  (Full details and data files)

  • Version 1.0: 2019-03-27
    Type: Initial release
  • Version 1.1: 2019-04-17
    Changes: Data collection, Database references