Crystal Structure of full-length HTPG, the Escherichia coli HSP90

Experimental Data Snapshot

  • Resolution: 3.50 Å
  • R-Value Free: 0.370 
  • R-Value Work: 0.329 

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Structural Analysis of E. coli hsp90 reveals dramatic nucleotide-dependent conformational rearrangements.

Shiau, A.K.Harris, S.F.Southworth, D.R.Agard, D.A.

(2006) Cell 127: 329-340

  • DOI: https://doi.org/10.1016/j.cell.2006.09.027
  • Primary Citation of Related Structures:  
    2GQ0, 2IOP, 2IOQ, 2IOR

  • PubMed Abstract: 

    In eukaryotes, the ubiquitous and abundant members of the 90 kilodalton heat-shock protein (hsp90) chaperone family facilitate the folding and conformational changes of a broad array of proteins important in cell signaling, proliferation, and survival. Here we describe the effects of nucleotides on the structure of full-length HtpG, the Escherichia coli hsp90 ortholog. By electron microscopy, the nucleotide-free, AMPPNP bound, and ADP bound states of HtpG adopt completely distinct conformations. Structural characterization of nucleotide-free and ADP bound HtpG was extended to higher resolution by X-ray crystallography. In the absence of nucleotide, HtpG exhibits an "open" conformation in which the three domains of each monomer present hydrophobic elements into the large cleft formed by the dimer. By contrast, ADP binding drives dramatic conformational changes that allow these hydrophobic elements to converge and shield each other from solvent, suggesting a mechanism by which nucleotides could control client protein binding and release.

  • Organizational Affiliation

    Howard Hughes Medical Institute and Department of Biochemistry and Biophysics, University of California, San Francisco, 94158, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chaperone protein htpG
A, B
624Escherichia coliMutation(s): 0 
Gene Names: htpG
Find proteins for P0A6Z3 (Escherichia coli (strain K12))
Explore P0A6Z3 
Go to UniProtKB:  P0A6Z3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A6Z3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.50 Å
  • R-Value Free: 0.370 
  • R-Value Work: 0.329 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.124α = 90
b = 105.124β = 90
c = 531.077γ = 120
Software Package:
Software NamePurpose
ADSCdata collection
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-11-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-21
    Changes: Data collection, Database references