Crystal Structure of the N-domain of the ER Hsp90 chaperone GRP94 in complex with Radicicol

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.222 

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Structure of the N-terminal domain of GRP94. Basis for ligand specificity and regulation

Soldano, K.L.Jivan, A.Nicchitta, C.V.Gewirth, D.T.

(2003) J Biol Chem 278: 48330-48338

  • DOI: https://doi.org/10.1074/jbc.M308661200
  • Primary Citation of Related Structures:  
    1QY8, 1QYE, 1U2O, 6D28

  • PubMed Abstract: 

    GRP94, the endoplasmic reticulum (ER) paralog of the chaperone Hsp90, plays an essential role in the structural maturation or secretion of a subset of proteins destined for transport to the cell surface, such as the Toll-like receptors 2 and 4, and IgG, respectively. GRP94 differs from cytoplasmic Hsp90 by exhibiting very weak ATP binding and hydrolysis activity. GRP94 also binds selectively to a series of substituted adenosine analogs. The high resolution crystal structures at 1.75-2.1 A of the N-terminal and adjacent charged domains of GRP94 in complex with N-ethylcarboxamidoadenosine, radicicol, and 2-chlorodideoxyadenosine reveals a structural mechanism for ligand discrimination among hsp90 family members. The structures also identify a putative subdomain that may act as a ligand-responsive switch. The residues of the charged region fold into a disordered loop whose termini are ordered and continue the twisted beta sheet that forms the structural core of the N-domain. This continuation of the beta sheet past the charged domain suggests a structural basis for the association of the N-terminal and middle domains of the full-length chaperone.

  • Organizational Affiliation

    Departments of Biochemistry and Cell Biology, Duke University Medical Center, Durham, North Carolina 27710, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Endoplasmin269Canis lupus familiarisMutation(s): 0 
Gene Names: TRA1
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 RDI

Download Ideal Coordinates CCD File 
C18 H23 Cl O6
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.222 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.749α = 90
b = 99.367β = 90
c = 63.298γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-11-11
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description