2X4A | pdb_00002x4a

Crystal structure of the C-terminal domain of InvA

• PDB DOI: https://doi.org/10.2210/pdb2X4A/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium str. LT2
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2010-01-28 Released: 2010-05-05 
• Deposition Author(s): Worrall, L.J., Vuckovic, M., Strynadka, N.C.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.54 Å
• R-Value Free: 
  0.264 (Depositor), 0.270 (DCC) 
• R-Value Work: 
  0.206 (Depositor), 0.210 (DCC) 
• R-Value Observed: 
  0.209 (Depositor) 

Starting Model: experimental

Literature

Crystal Structure of the C-Terminal Domain of the Salmonella Type III Secretion System Export Apparatus Protein Inva.

Worrall, L.J., Vuckovic, M., Strynadka, N.C.J.

(2010) Protein Sci 19: 1091

• PubMed: 20306492 
• DOI: https://doi.org/10.1002/pro.382
• Primary Citation of Related Structures:  
  2X49, 2X4A


• PubMed Abstract: 
  

  InvA is a prominent inner-membrane component of the Salmonella type III secretion system (T3SS) apparatus, which is responsible for regulating virulence protein export in pathogenic bacteria. InvA is made up of an N-terminal integral membrane domain and a C-terminal cytoplasmic domain that is proposed to form part of a docking platform for the soluble export apparatus proteins notably the T3SS ATPase InvC. Here, we report the novel crystal structure of the C-terminal domain of Salmonella InvA which shows a compact structure composed of four subdomains. The overall structure is unique although the first and second subdomains exhibit structural similarity to the peripheral stalk of the A/V-type ATPase and a ring building motif found in other T3SS proteins respectively.

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Organizational Affiliation: 

Centre for Blood Research, Department of Biochemistry and Molecular Biology, University of British Columbia, Life Sciences Centre, British Columbia, Canada V6T 1Z3.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 38.56 kDa 
• Atom Count: 2,750 
• Modelled Residue Count: 327 
• Deposited Residue Count: 333 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
INVASION PROTEIN INVA	A	333	Salmonella enterica subsp. enterica serovar Typhimurium str. LT2	Mutation(s): 0
UniProt
Find proteins for P0A1I3 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P0A1I3  Go to UniProtKB:  P0A1I3

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CXS	B [auth A]	3-CYCLOHEXYL-1-PROPYLSULFONIC ACID C9 H19 N O3 S PJWWRFATQTVXHA-UHFFFAOYSA-N
PO4	C [auth A], D [auth A]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.54 Å
• R-Value Free:  0.264 (Depositor), 0.270 (DCC) 
• R-Value Work:  0.206 (Depositor), 0.210 (DCC) 
• R-Value Observed: 0.209 (Depositor) 

Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 79.17	α = 90
b = 79.17	β = 90
c = 127.71	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-05-05 
Deposition Author(s): Worrall, L.J., Vuckovic, M., Strynadka, N.C.J.

Revision History  

• Version 1.0: 2010-05-05
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.2: 2023-12-20
  Changes: Data collection, Database references, Derived calculations, Other, Refinement description