4JIV

VCA0105 PAAR-repeat protein from Vibrio cholerae in complex with a VgrG-like beta-helix that is based on a fragment of T4 gp5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.166 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

PAAR-repeat proteins sharpen and diversify the type VI secretion system spike.

Shneider, M.M.Buth, S.A.Ho, B.T.Basler, M.Mekalanos, J.J.Leiman, P.G.

(2013) Nature 500: 350-353

  • DOI: 10.1038/nature12453
  • Primary Citation of Related Structures:  
    4JIV, 4JIW

  • PubMed Abstract: 
  • The bacterial type VI secretion system (T6SS) is a large multicomponent, dynamic macromolecular machine that has an important role in the ecology of many Gram-negative bacteria. T6SS is responsible for translocation of a wide range of toxic effector molecules, allowing predatory cells to kill both prokaryotic as well as eukaryotic prey cells ...

    The bacterial type VI secretion system (T6SS) is a large multicomponent, dynamic macromolecular machine that has an important role in the ecology of many Gram-negative bacteria. T6SS is responsible for translocation of a wide range of toxic effector molecules, allowing predatory cells to kill both prokaryotic as well as eukaryotic prey cells. The T6SS organelle is functionally analogous to contractile tails of bacteriophages and is thought to attack cells by initially penetrating them with a trimeric protein complex called the VgrG spike. Neither the exact protein composition of the T6SS organelle nor the mechanisms of effector selection and delivery are known. Here we report that proteins from the PAAR (proline-alanine-alanine-arginine) repeat superfamily form a sharp conical extension on the VgrG spike, which is further involved in attaching effector domains to the spike. The crystal structures of two PAAR-repeat proteins bound to VgrG-like partners show that these proteins sharpen the tip of the T6SS spike complex. We demonstrate that PAAR proteins are essential for T6SS-mediated secretion and target cell killing by Vibrio cholerae and Acinetobacter baylyi. Our results indicate a new model of the T6SS organelle in which the VgrG-PAAR spike complex is decorated with multiple effectors that are delivered simultaneously into target cells in a single contraction-driven translocation event.


    Organizational Affiliation

    École Polytechnique Fédérale de Lausanne (EPFL), BSP-415, 1015 Lausanne, Switzerland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tail-associated lysozyme ABC96Escherichia virus T4Mutation(s): 6 
Gene Names: 5
EC: 3.2.1.17
Find proteins for P16009 (Enterobacteria phage T4)
Explore P16009 
Go to UniProtKB:  P16009
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Putative uncharacterized protein D93Vibrio cholerae O1 biovar El Tor str. N16961Mutation(s): 0 
Gene Names: VC_A0105
Find proteins for Q9KN60 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KN60 
Go to UniProtKB:  Q9KN60
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
STE
Query on STE

Download Ideal Coordinates CCD File 
B
STEARIC ACID
C18 H36 O2
QIQXTHQIDYTFRH-UHFFFAOYSA-N
 Ligand Interaction
ELA
Query on ELA

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C
9-OCTADECENOIC ACID
C18 H34 O2
ZQPPMHVWECSIRJ-MDZDMXLPSA-N
 Ligand Interaction
PLM
Query on PLM

Download Ideal Coordinates CCD File 
A
PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

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D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.166 
  • Space Group: P 42 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.703α = 90
b = 113.703β = 90
c = 76.897γ = 90
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-14
    Type: Initial release
  • Version 1.1: 2014-06-11
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Refinement description