Structure of GRP94 in the active conformation

Experimental Data Snapshot

  • Resolution: 2.62 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.246 

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This is version 1.3 of the entry. See complete history


Structural and Functional Analysis of GRP94 in the Closed State Reveals an Essential Role for the Pre-N Domain and a Potential Client-Binding Site.

Huck, J.D.Que, N.L.Hong, F.Li, Z.Gewirth, D.T.

(2017) Cell Rep 20: 2800-2809

  • DOI: https://doi.org/10.1016/j.celrep.2017.08.079
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Hsp90 chaperones undergo ATP-driven conformational changes during the maturation of client proteins, populating a closed state upon ATP binding in which the N-terminal domains of the homodimer form a second inter-protomer dimer interface. A structure of GRP94, the endoplasmic reticulum hsp90, in a closed conformation has not been described, and the determinants that regulate closure are not well understood. Here, we determined the 2.6-Å structure of AMPPNP-bound GRP94 in the closed dimer conformation. The structure includes the pre-N domain, a region preceding the N-terminal domain that is highly conserved in GRP94, but not in other hsp90s. We show that the GRP94 pre-N domain is essential for client maturation, and we identify the pre-N domain as an important regulator of ATPase rates and dimer closure. The structure also reveals a GRP94:polypeptide interaction that partially mimics a client-bound state. The results provide structural insight into the ATP-dependent client maturation process of GRP94.

  • Organizational Affiliation

    Hauptman-Woodward Medical Research Institute, Buffalo, NY, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
691Canis lupus familiarisMutation(s): 0 
Gene Names: HSP90B1GRP94TRA1
Find proteins for P41148 (Canis lupus familiaris)
Explore P41148 
Go to UniProtKB:  P41148
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP41148
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on ANP

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C10 H17 N6 O12 P3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.62 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.246 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.131α = 90
b = 109.999β = 90
c = 157.864γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesP01CA186866
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesR01CA095130

Revision History  (Full details and data files)

  • Version 1.0: 2017-09-27
    Type: Initial release
  • Version 1.1: 2017-10-04
    Changes: Database references
  • Version 1.2: 2019-12-04
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-04
    Changes: Data collection, Database references, Refinement description