Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 67.23 kDa 
• Atom Count: 5216 
• Residue Count: 617 
• Unique protein chains: 2

2CH7

Crystal structure of the cytoplasmic domain of a bacterial chemoreceptor from Thermotoga maritima

• DOI: 10.2210/pdb2CH7/pdb

• Classification: CHEMOTAXIS
• Organism(s): Thermotoga maritima
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2006-03-13 Released: 2006-04-18 
• Deposition Author(s): Park, S.Y., Bilwes, A.M., Crane, B.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.297 
• R-Value Work: 0.259 
• R-Value Observed: 0.259 

Literature

Reconstruction of the Chemotaxis Receptor-Kinase Assembly

Park, S.Y., Borbat, P.P., Gonzalez-Bonet, G., Bhatnagar, J., Pollard, A.M., Freed, J.H., Bilwes, A.M., Crane, B.R.

(2006) Nat Struct Mol Biol 13: 400

• PubMed: 16622408 
• DOI: 10.1038/nsmb1085
• Primary Citation of Related Structures:  
  2CH4, 2CH7


• PubMed Abstract: 
  

In bacterial chemotaxis, an assembly of transmembrane receptors, the CheA histidine kinase and the adaptor protein CheW processes environmental stimuli to regulate motility. The structure of a Thermotoga maritima receptor cytoplasmic domain defines CheA interaction regions and metal ion-coordinating charge centers that undergo chemical modification to tune receptor response. Dimeric CheA-CheW, defined by crystallography and pulsed ESR, positions two CheWs to form a cleft that is lined with residues important for receptor interactions and sized to clamp one receptor dimer. CheW residues involved in kinase activation map to interfaces that orient the CheW clamps. CheA regulatory domains associate in crystals through conserved hydrophobic surfaces. Such CheA self-contacts align the CheW receptor clamps for binding receptor tips. Linking layers of ternary complexes with close-packed receptors generates a lattice with reasonable component ratios, cooperative interactions among receptors and accessible sites for modification enzymes.

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Organizational Affiliation: 

Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
METHYL-ACCEPTING CHEMOTAXIS PROTEIN	A	309	Thermotoga maritima	Mutation(s): 0
Find proteins for Q9X0M7 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)) Explore Q9X0M7  Go to UniProtKB:  Q9X0M7

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
METHYL-ACCEPTING CHEMOTAXIS PROTEIN	B	309	Thermotoga maritima	Mutation(s): 0
Find proteins for Q9X0M7 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)) Explore Q9X0M7  Go to UniProtKB:  Q9X0M7

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PB	A	LEAD (II) ION Pb RVPVRDXYQKGNMQ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.297 
• R-Value Work: 0.259 
• R-Value Observed: 0.259 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 24.6	α = 90
b = 99.4	β = 90.5
c = 117.2	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
HKL-2000	data reduction
SCALEPACK	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-03-13 
• Released Date: 2006-04-18 
Deposition Author(s): Park, S.Y., Bilwes, A.M., Crane, B.R.

Revision History 

• Version 1.0: 2006-04-18
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance