Crystal structure of mitochondrial Hsp90 (TRAP1) NTD-Middle domain dimer with AMPPNP

Experimental Data Snapshot

  • Resolution: 1.75 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 

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Structural asymmetry in the closed state of mitochondrial Hsp90 (TRAP1) supports a two-step ATP hydrolysis mechanism.

Lavery, L.A.Partridge, J.R.Ramelot, T.A.Elnatan, D.Kennedy, M.A.Agard, D.A.

(2014) Mol Cell 53: 330-343

  • DOI: https://doi.org/10.1016/j.molcel.2013.12.023
  • Primary Citation of Related Structures:  
    4IPE, 4IVG, 4IYN, 4J0B

  • PubMed Abstract: 

    While structural symmetry is a prevailing feature of homo-oligomeric proteins, asymmetry provides unique mechanistic opportunities. We present the crystal structure of full-length TRAP1, the mitochondrial Hsp90 molecular chaperone, in a catalytically active closed state. The TRAP1 homodimer adopts a distinct, asymmetric conformation, where one protomer is reconfigured via a helix swap at the middle:C-terminal domain (MD:CTD) interface. This interface plays a critical role in client binding. Solution methods validate the asymmetry and show extension to Hsp90 homologs. Point mutations that disrupt unique contacts at each MD:CTD interface reduce catalytic activity and substrate binding and demonstrate that each protomer needs access to both conformations. Crystallographic data on a dimeric NTD:MD fragment suggests that asymmetry arises from strain induced by simultaneous NTD and CTD dimerization. The observed asymmetry provides the potential for an additional step in the ATPase cycle, allowing sequential ATP hydrolysis steps to drive both client remodeling and client release.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TNF receptor-associated protein 1647Danio rerioMutation(s): 1 
Gene Names: trap1
Find proteins for A8WFV1 (Danio rerio)
Explore A8WFV1 
Go to UniProtKB:  A8WFV1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA8WFV1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.75 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.146α = 90
b = 94.509β = 90
c = 155.456γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-01-22
    Type: Initial release
  • Version 1.1: 2014-08-27
    Changes: Database references