3PXI

Structure of MecA108:ClpC


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 6.93 Å
  • R-Value Free: 0.422 
  • R-Value Work: 0.407 
  • R-Value Observed: 0.408 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and mechanism of the hexameric MecA-ClpC molecular machine.

Wang, F.Mei, Z.Q.Qi, Y.Yan, C.G.Hu, Q.Wang, J.W.Shi, Y.G.

(2011) Nature 471: 331-335

  • DOI: 10.1038/nature09780
  • Primary Citation of Related Structures:  
    3PXG, 3PXI, 2Y1R, 2Y1Q

  • PubMed Abstract: 
  • Regulated proteolysis by ATP-dependent proteases is universal in all living cells. Bacterial ClpC, a member of the Clp/Hsp100 family of AAA+ proteins (ATPases associated with diverse cellular activities) with two nucleotide-binding domains (D1 and D2 ...

    Regulated proteolysis by ATP-dependent proteases is universal in all living cells. Bacterial ClpC, a member of the Clp/Hsp100 family of AAA+ proteins (ATPases associated with diverse cellular activities) with two nucleotide-binding domains (D1 and D2), requires the adaptor protein MecA for activation and substrate targeting. The activated, hexameric MecA-ClpC molecular machine harnesses the energy of ATP binding and hydrolysis to unfold specific substrate proteins and translocate the unfolded polypeptide to the ClpP protease for degradation. Here we report three related crystal structures: a heterodimer between MecA and the amino domain of ClpC, a heterododecamer between MecA and D2-deleted ClpC, and a hexameric complex between MecA and full-length ClpC. In conjunction with biochemical analyses, these structures reveal the organizational principles behind the hexameric MecA-ClpC complex, explain the molecular mechanisms for MecA-mediated ClpC activation and provide mechanistic insights into the function of the MecA-ClpC molecular machine. These findings have implications for related Clp/Hsp100 molecular machines.


    Organizational Affiliation

    Center for Structural Biology, School of Life Sciences and School of Medicine, Tsinghua University, Beijing 100084, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Adapter protein mecA 1abc111Bacillus subtilisMutation(s): 0 
Gene Names: mecABSU11520
Find proteins for P37958 (Bacillus subtilis (strain 168))
Explore P37958 
Go to UniProtKB:  P37958
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Negative regulator of genetic competence ClpC/MecBABC758Bacillus subtilisMutation(s): 2 
Gene Names: clpCmecBBSU00860
Find proteins for P37571 (Bacillus subtilis (strain 168))
Explore P37571 
Go to UniProtKB:  P37571
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 6.93 Å
  • R-Value Free: 0.422 
  • R-Value Work: 0.407 
  • R-Value Observed: 0.408 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 141.806α = 90
b = 141.806β = 90
c = 656.078γ = 120
Software Package:
Software NamePurpose
BSSdata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-03-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-06-27
    Changes: Database references