1Y9L

The X-ray structure of an secretion system protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


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: 10.1038/sj.emboj.7600610
  • Primary Citation of Related Structures:  

  • 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. ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Lipoprotein mxiM
A
115Shigella flexneriMutation(s): 0 
Gene Names: mxiM
Find proteins for P0A1X2 (Shigella flexneri)
Go to UniProtKB:  P0A1X2
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
UND
Query on UND

Download SDF File 
Download CCD File 
A
UNDECANE
LIPID FRAGMENT
C11 H24
RSJKGSCJYJTIGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.220 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 82.844α = 90.00
b = 49.683β = 102.27
c = 29.487γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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