1U2M

Crystal Structure of Skp


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.232 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal Structure of Skp, a Prefoldin-like Chaperone that Protects Soluble and Membrane Proteins from Aggregation

Walton, T.A.Sousa, M.C.

(2004) Mol.Cell 15: 367-374

  • DOI: 10.1016/j.molcel.2004.07.023

  • PubMed Abstract: 
  • The Seventeen Kilodalton Protein (Skp) is a trimeric periplasmic chaperone that assists outer membrane proteins in their folding and insertion into membranes. Here we report the crystal structure of Skp from E. coli. The structure of the Skp trimer r ...

    The Seventeen Kilodalton Protein (Skp) is a trimeric periplasmic chaperone that assists outer membrane proteins in their folding and insertion into membranes. Here we report the crystal structure of Skp from E. coli. The structure of the Skp trimer resembles a jellyfish with alpha-helical tentacles protruding from a beta barrel body defining a central cavity. The architecture of Skp is unexpectedly similar to that of Prefoldin/GimC, a cytosolic chaperone present in eukaria and archea, that binds unfolded substrates in its central cavity. The ability of Skp to prevent the aggregation of model substrates in vitro is independent of ATP. Skp can interact directly with membrane lipids and lipopolysaccharide (LPS). These interactions are needed for efficient Skp-assisted folding of membrane proteins. We have identified a putative LPS binding site on the outer surface of Skp and propose a model for unfolded substrate binding.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, CO 80309, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Histone-like protein HLP-1
A, B, C
143Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: skp (hlpA, ompH)
Find proteins for P0AEU7 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEU7
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.232 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 55.828α = 90.00
b = 84.190β = 90.00
c = 160.181γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
SOLVEphasing
Blu-Icedata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-24
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description