1Z9S

Crystal Structure of the native chaperone:subunit:subunit Caf1M:Caf1:Caf1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.223 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Resolving the energy paradox of chaperone/usher-mediated fibre assembly

Zavialov, A.V.Tischenko, V.M.Fooks, L.J.Brandsdal, B.O.Aqvist, J.Zav'yalov, V.P.Macintyre, S.Knight, S.D.

(2005) Biochem.J. 389: 685-694

  • DOI: 10.1042/BJ20050426

  • PubMed Abstract: 
  • Periplasmic chaperone/usher machineries are used for assembly of filamentous adhesion organelles of Gram-negative pathogens in a process that has been suggested to be driven by folding energy. Structures of mutant chaperone-subunit complexes revealed ...

    Periplasmic chaperone/usher machineries are used for assembly of filamentous adhesion organelles of Gram-negative pathogens in a process that has been suggested to be driven by folding energy. Structures of mutant chaperone-subunit complexes revealed a final folding transition (condensation of the subunit hydrophobic core) on the release of organelle subunit from the chaperone-subunit pre-assembly complex and incorporation into the final fibre structure. However, in view of the large interface between chaperone and subunit in the pre-assembly complex and the reported stability of this complex, it is difficult to understand how final folding could release sufficient energy to drive assembly. In the present paper, we show the X-ray structure for a native chaperone-fibre complex that, together with thermodynamic data, shows that the final folding step is indeed an essential component of the assembly process. We show that completion of the hydrophobic core and incorporation into the fibre results in an exceptionally stable module, whereas the chaperone-subunit pre-assembly complex is greatly destabilized by the high-energy conformation of the bound subunit. This difference in stabilities creates a free energy potential that drives fibre formation.


    Organizational Affiliation

    Department of Molecular Biology, Uppsala Biomedical Center, Swedish University of Agricultural Sciences, Box 590, SE-753 24 Uppsala, Sweden. anton.zavialov@molbio.slu.se




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chaperone protein Caf1M
A
235Yersinia pestisMutation(s): 0 
Gene Names: caf1M
Find proteins for P26926 (Yersinia pestis)
Go to UniProtKB:  P26926
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
F1 capsule antigen
B, C
149Yersinia pestisMutation(s): 0 
Gene Names: caf1
Find proteins for P26948 (Yersinia pestis)
Go to UniProtKB:  P26948
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.223 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 69.800α = 90.00
b = 180.140β = 90.00
c = 45.730γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
MOLREPphasing
CCP4data scaling
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-06-21
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance