Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 43.01 kDa 
• Atom Count: 3125 
• Modelled Residue Count: 359 
• Deposited Residue Count: 378 
• Unique protein chains: 1

1I5C

STRUCTURE OF CHEA DOMAIN P4 IN COMPLEX WITH ADP

• PDB DOI: 10.2210/pdb1I5C/pdb

• Classification: SIGNALING PROTEIN, TRANSFERASE
• Organism(s): Thermotoga maritima
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2001-02-26 Released: 2001-08-26 
• Deposition Author(s): Bilwes, A.M., Quezada, C.M., Croal, L.R., Crane, B.R., Simon, M.I.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.261 
• R-Value Work: 0.225 
• R-Value Observed: 0.225 

Literature

Nucleotide binding by the histidine kinase CheA.

Bilwes, A.M., Quezada, C.M., Croal, L.R., Crane, B.R., Simon, M.I.

(2001) Nat Struct Biol 8: 353-360

• PubMed: 11276258 
• DOI: 10.1038/86243
• Primary Citation of Related Structures:  
  1I58, 1I59, 1I5A, 1I5B, 1I5C, 1I5D


• PubMed Abstract: 
  

To probe the structural basis for protein histidine kinase (PHK) catalytic activity and the prospects for PHK-specific inhibitor design, we report the crystal structures for the nucleotide binding domain of Thermotoga maritima CheA with ADP and three ATP analogs (ADPNP, ADPCP and TNP-ATP) bound with either Mg(2+) or Mn(2+). The conformation of ADPNP bound to CheA and related ATPases differs from that reported in the ADPNP complex of PHK EnvZ. Interactions of the active site with the nucleotide gamma-phosphate and its associated Mg(2+) ion are linked to conformational changes in an ATP-lid that could mediate recognition of the substrate domain. The inhibitor TNP-ATP binds CheA with its phosphates in a nonproductive conformation and its adenine and trinitrophenyl groups in two adjacent binding pockets. The trinitrophenyl interaction may be exploited for designing CheA-targeted drugs that would not interfere with host ATPases.

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Organizational Affiliation: 

Division of Biology, California Institute of Technology, 1200 East California Blvd., Pasadena, California 91125, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CHEMOTAXIS PROTEIN CHEA	A, B	189	Thermotoga maritima	Mutation(s): 3  EC: 2.7.3 (PDB Primary Data), 2.7.13.3 (UniProt)
UniProt
Find proteins for Q56310 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8)) Explore Q56310  Go to UniProtKB:  Q56310

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP	C [auth A], D [auth B]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.261 
• R-Value Work: 0.225 
• R-Value Observed: 0.225 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 41.28	α = 90
b = 49.49	β = 90.48
c = 89.59	γ = 90

Software Package:

Software Name	Purpose
EPMR	phasing
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-02-26 
• Released Date: 2001-08-26 
Deposition Author(s): Bilwes, A.M., Quezada, C.M., Croal, L.R., Crane, B.R., Simon, M.I.

Revision History  

• Version 1.0: 2001-08-26
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-10-27
  Changes: Database references, Derived calculations