2JW1

Structural characterization of the type III pilotin-secretin interaction in Shigella flexneri by NMR spectroscopy


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Characterization of the Type-III Pilot-Secretin Complex from Shigella flexneri

Okon, M.Moraes, T.F.Lario, P.I.Creagh, A.L.Haynes, C.A.Strynadka, N.C.McIntosh, L.P.

(2008) Structure 16: 1544-1554

  • DOI: 10.1016/j.str.2008.08.006

  • PubMed Abstract: 
  • Assembly of the type-III secretion apparatus, which translocates proteins through both membranes of Gram-negative bacterial pathogens into host cells, requires the formation of an integral outer-membrane secretin ring. Typically, a small lipidated pi ...

    Assembly of the type-III secretion apparatus, which translocates proteins through both membranes of Gram-negative bacterial pathogens into host cells, requires the formation of an integral outer-membrane secretin ring. Typically, a small lipidated pilot protein is necessary for the stabilization and localization of this ring. Using NMR spectroscopy, we demonstrate that the C-terminal residues 553-570 of the Shigella flexneri secretin MxiD encompass the minimal binding domain for its cognate pilot MxiM. Although unstructured in isolation, upon complex formation with MxiM, these residues fold into an amphipathic turn-helix motif that caps the elongated hydrophobic cavity of the cracked beta-barrel pilot. Along with a rearrangement of core aromatic residues, this prevents the binding of lipids within the cavity. The mutually exclusive association of lipids and MxiD with MxiM establishes a framework for understanding the role of a pilot in the outer-membrane insertion and multimerization of the secretin ring.


    Organizational Affiliation

    Department of Biochemistry & Molecular Biology, University of British Columbia, Vancouver, BC V6T 1Z3, 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
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Outer membrane protein mxiD
B
19Shigella flexneriMutation(s): 0 
Gene Names: mxiD
Find proteins for Q04641 (Shigella flexneri)
Go to UniProtKB:  Q04641
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ACE
Query on ACE
B
NON-POLYMERC2 H4 O

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Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2JW1 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-09-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance