1Y9L

The X-ray structure of an secretion system protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structure and biochemical analysis of a secretin pilot protein.

Lario, P.I.Pfuetzner, R.A.Frey, E.A.Creagh, L.Haynes, C.Maurelli, A.T.Strynadka, N.C.

(2005) EMBO J 24: 1111-1121

  • DOI: https://doi.org/10.1038/sj.emboj.7600610
  • Primary Citation of Related Structures:  
    1Y9L, 1Y9T

  • PubMed Abstract: 

    The ability to translocate virulence proteins into host cells through a type III secretion apparatus (TTSS) is a hallmark of several Gram-negative pathogens including Shigella, Salmonella, Yersinia, Pseudomonas, and enteropathogenic Escherichia coli. In common with other types of bacterial secretion apparatus, the assembly of the TTSS complex requires the preceding formation of its integral outer membrane secretin ring component. We have determined at 1.5 A the structure of MxiM28-142, the Shigella pilot protein that is essential for the assembly and membrane association of the Shigella secretin, MxiD. This represents the first atomic structure of a secretin pilot protein from the several bacterial secretion systems containing an orthologous secretin component. A deep hydrophobic cavity is observed in the novel 'cracked barrel' structure of MxiM, providing a specific binding domain for the acyl chains of bacterial lipids, a proposal that is supported by our various lipid/MxiM complex structures. Isothermal titration analysis shows that the C-terminal domain of the secretin, MxiD525-570, hinders lipid binding to MxiM.


  • Organizational Affiliation

    Department of Biochemistry, University of British Columbia, Vancouver, BC, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Lipoprotein mxiM115Shigella flexneriMutation(s): 0 
Gene Names: mxiM
UniProt
Find proteins for P0A1X2 (Shigella flexneri)
Explore P0A1X2 
Go to UniProtKB:  P0A1X2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A1X2
Sequence Annotations
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.844α = 90
b = 49.683β = 102.27
c = 29.487γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-04-12
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance