4I9K

Crystal structure of symmetric W-W-W ClpX Hexamer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 5.00 Å
  • R-Value Free: 0.354 
  • R-Value Work: 0.316 
  • R-Value Observed: 0.320 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Nucleotide Binding and Conformational Switching in the Hexameric Ring of a AAA+ Machine.

Stinson, B.M.Nager, A.R.Glynn, S.E.Schmitz, K.R.Baker, T.A.Sauer, R.T.

(2013) Cell 153: 628-639

  • DOI: 10.1016/j.cell.2013.03.029
  • Primary Citation of Related Structures:  
    4I34, 4I4L, 4I63, 4I5O, 4I81, 4I9K

  • PubMed Abstract: 
  • ClpX, a AAA+ ring homohexamer, uses the energy of ATP binding and hydrolysis to power conformational changes that unfold and translocate target proteins into the ClpP peptidase for degradation. In multiple crystal structures, some ClpX subunits adopt nucleotide-loadable conformations, others adopt unloadable conformations, and each conformational class exhibits substantial variability ...

    ClpX, a AAA+ ring homohexamer, uses the energy of ATP binding and hydrolysis to power conformational changes that unfold and translocate target proteins into the ClpP peptidase for degradation. In multiple crystal structures, some ClpX subunits adopt nucleotide-loadable conformations, others adopt unloadable conformations, and each conformational class exhibits substantial variability. Using mutagenesis of individual subunits in covalently tethered hexamers together with fluorescence methods to assay the conformations and nucleotide-binding properties of these subunits, we demonstrate that dynamic interconversion between loadable and unloadable conformations is required to couple ATP hydrolysis by ClpX to mechanical work. ATP binding to different classes of subunits initially drives staged allosteric changes, which set the conformation of the ring to allow hydrolysis and linked mechanical steps. Subunit switching between loadable and unloadable conformations subsequently isomerizes or resets the configuration of the nucleotide-loaded ring and is required for mechanical function.


    Organizational Affiliation

    Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-dependent Clp protease ATP-binding subunit ClpXA, B363Escherichia coli K-12Mutation(s): 1 
Gene Names: b0438clpXJW0428lopC
UniProt
Find proteins for P0A6H1 (Escherichia coli (strain K12))
Explore P0A6H1 
Go to UniProtKB:  P0A6H1
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 5.00 Å
  • R-Value Free: 0.354 
  • R-Value Work: 0.316 
  • R-Value Observed: 0.320 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 119.43α = 90
b = 119.43β = 90
c = 111.72γ = 120
Software Package:
Software NamePurpose
SCALAdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
HKL-2000data reduction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-15
    Type: Initial release