5F3K

X-Ray Crystallographic Structure of hTrap1 N-terminal Domain-apo


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Mitochondrial Hsp90 is a ligand-activated molecular chaperone coupling ATP binding to dimer closure through a coiled-coil intermediate.

Sung, N.Lee, J.Kim, J.H.Chang, C.Joachimiak, A.Lee, S.Tsai, F.T.

(2016) Proc.Natl.Acad.Sci.USA 113: 2952-2957

  • DOI: 10.1073/pnas.1516167113
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Heat-shock protein of 90 kDa (Hsp90) is an essential molecular chaperone that adopts different 3D structures associated with distinct nucleotide states: a wide-open, V-shaped dimer in the apo state and a twisted, N-terminally closed dimer with ATP. A ...

    Heat-shock protein of 90 kDa (Hsp90) is an essential molecular chaperone that adopts different 3D structures associated with distinct nucleotide states: a wide-open, V-shaped dimer in the apo state and a twisted, N-terminally closed dimer with ATP. Although the N domain is known to mediate ATP binding, how Hsp90 senses the bound nucleotide and facilitates dimer closure remains unclear. Here we present atomic structures of human mitochondrial Hsp90N (TRAP1N) and a composite model of intact TRAP1 revealing a previously unobserved coiled-coil dimer conformation that may precede dimer closure and is conserved in intact TRAP1 in solution. Our structure suggests that TRAP1 normally exists in an autoinhibited state with the ATP lid bound to the nucleotide-binding pocket. ATP binding displaces the ATP lid that signals the cis-bound ATP status to the neighboring subunit in a highly cooperative manner compatible with the coiled-coil intermediate state. We propose that TRAP1 is a ligand-activated molecular chaperone, which couples ATP binding to dramatic changes in local structure required for protein folding.


    Organizational Affiliation

    Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030;




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Heat shock protein 75 kDa, mitochondrial
A, B
238Homo sapiensMutation(s): 0 
Gene Names: TRAP1 (HSP75)
Find proteins for Q12931 (Homo sapiens)
Go to Gene View: TRAP1
Go to UniProtKB:  Q12931
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.182 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 65.250α = 90.00
b = 65.250β = 90.00
c = 233.372γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
MOLREPphasing
HKL-3000data scaling
HKL-3000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01GM111084
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01GM104980
Welch FoundationUnited StatesQ-1530

Revision History 

  • Version 1.0: 2016-03-02
    Type: Initial release
  • Version 1.1: 2016-03-23
    Type: Database references
  • Version 1.2: 2016-06-22
    Type: Database references
  • Version 1.3: 2017-09-13
    Type: Author supporting evidence, Database references, Derived calculations