2CHE

STRUCTURE OF THE MG2+-BOUND FORM OF CHEY AND MECHANISM OF PHOSPHORYL TRANSFER IN BACTERIAL CHEMOTAXIS

• PDB DOI: https://doi.org/10.2210/pdb2CHE/pdb

• Classification: SIGNAL TRANSDUCTION PROTEIN
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium
• Mutation(s): No 


• Deposited: 1994-01-17 Released: 1994-04-30 
• Deposition Author(s): Stock, A., Martinez-Hackert, E., Rasmussen, B., West, A., Stock, J., Ringe, D., Petsko, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Observed: 0.190 

Literature

Structure of the Mg(2+)-bound form of CheY and mechanism of phosphoryl transfer in bacterial chemotaxis.

Stock, A.M., Martinez-Hackert, E., Rasmussen, B.F., West, A.H., Stock, J.B., Ringe, D., Petsko, G.A.

(1993) Biochemistry 32: 13375-13380

• PubMed: 8257674 
• DOI: https://doi.org/10.1021/bi00212a001
• Primary Citation of Related Structures:  
  2CHE, 2CHF


• PubMed Abstract: 
  

  The response regulator protein of bacterial chemotaxis, CheY, is representative of a large family of signal transduction proteins that function as phosphorylation-activated switches to regulate the activities of associated effector domains. These regulators catalyze the metal ion-dependent phosphoryl transfer and dephosphorylation reactions that control the effector activities. The crystal structures of Salmonella typhimurium CheY with and without Mg2+ bound at the active site have been determined and refined at 1.8-A resolution. While the overall structures of metal-bound and metal-free CheY are similar, significant rearrangements occur within the active site involving the three most highly conserved residues of the response regulator family. Conservation of the cluster of carboxylate side chains at the active site of response regulator domains can be rationalized in terms of their role in coordinating the catalytically essential divalent metal ion. The Mg2+ coordination geometry provides insights to the mechanism of phosphoryl transfer.

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Organizational Affiliation: 

Center for Advanced Biotechnology and Medicine, Piscataway, New Jersey.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 14.03 kDa 
• Atom Count: 1,078 
• Modelled Residue Count: 128 
• Deposited Residue Count: 128 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CHEY	A	128	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0
UniProt
Find proteins for P0A2D5 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P0A2D5  Go to UniProtKB:  P0A2D5

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Observed: 0.190 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 45.71	α = 90
b = 46.98	β = 90
c = 53.91	γ = 90

Software Package:

Software Name	Purpose
PROLSQ	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 1994-04-30 
Deposition Author(s): Stock, A., Martinez-Hackert, E., Rasmussen, B., West, A., Stock, J., Ringe, D., Petsko, G.

Revision History  

• Version 1.0: 1994-04-30
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-11-29
  Changes: Derived calculations, Other
• Version 1.4: 2024-02-14
  Changes: Data collection, Database references, Derived calculations