Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 2 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 28 kDa 
• Atom Count: 1,802 
• Modelled Residue Count: 216 
• Deposited Residue Count: 238 
• Unique protein chains: 2

 5KEV

Vibrio parahaemolyticus VtrA/VtrC complex

• PDB DOI: 10.2210/pdb5KEV/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Vibrio parahaemolyticus RIMD 2210633
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2016-06-10 Released: 2016-07-20 
• Deposition Author(s): Tomchick, D.R., Orth, K., Rivera-Cancel, G.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.298 
• R-Value Work: 0.260 
• R-Value Observed: 0.265 

Literature

Bile salt receptor complex activates a pathogenic type III secretion system.

Li, P., Rivera-Cancel, G., Kinch, L.N., Salomon, D., Tomchick, D.R., Grishin, N.V., Orth, K.

(2016) Elife 5

• PubMed: 27377244 
• DOI: 10.7554/eLife.15718
• Primary Citation of Related Structures:  
  5KEV, 5KEW


• PubMed Abstract: 
  

Bile is an important component of the human gastrointestinal tract with an essential role in food absorption and antimicrobial activities. Enteric bacterial pathogens have developed strategies to sense bile as an environmental cue to regulate virulence genes during infection. We discovered that Vibrio parahaemolyticus VtrC, along with VtrA and VtrB, are required for activating the virulence type III secretion system 2 in response to bile salts. The VtrA/VtrC complex activates VtrB in the presence of bile salts. The crystal structure of the periplasmic domains of the VtrA/VtrC heterodimer reveals a β-barrel with a hydrophobic inner chamber. A co-crystal structure of VtrA/VtrC with bile salt, along with biophysical and mutational analysis, demonstrates that the hydrophobic chamber binds bile salts and activates the virulence network. As part of a family of conserved signaling receptors, VtrA/VtrC provides structural and functional insights into the evolutionarily conserved mechanism used by bacteria to sense their environment.

---

Organizational Affiliation: 

Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, United States.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
VtrA Protein	A	94	Vibrio parahaemolyticus RIMD 2210633	Mutation(s): 0  Gene Names: VPA1332
UniProt
Find proteins for Q87GI4 (Vibrio parahaemolyticus serotype O3:K6 (strain RIMD 2210633)) Explore Q87GI4  Go to UniProtKB:  Q87GI4

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
VtrC Protein	B	144	Vibrio parahaemolyticus RIMD 2210633	Mutation(s): 0  Gene Names: VPA1333
UniProt
Find proteins for Q87GI3 (Vibrio parahaemolyticus serotype O3:K6 (strain RIMD 2210633)) Explore Q87GI3  Go to UniProtKB:  Q87GI3

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	C [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.298 
• R-Value Work: 0.260 
• R-Value Observed: 0.265 
• Space Group: F 4 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 211.012	α = 90
b = 211.012	β = 90
c = 211.012	γ = 90

Software Package:

Software Name	Purpose
HKL-3000	data scaling
PHENIX	refinement
PDB_EXTRACT	data extraction
HKL-3000	data reduction
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2016-07-20 
Deposition Author(s): Tomchick, D.R., Orth, K., Rivera-Cancel, G.

Revision History  

• Version 1.0: 2016-07-20
  Type: Initial release