1CHN | pdb_00001chn

MAGNESIUM BINDING TO THE BACTERIAL CHEMOTAXIS PROTEIN CHEY RESULTS IN LARGE CONFORMATIONAL CHANGES INVOLVING ITS FUNCTIONAL SURFACE

• PDB DOI: https://doi.org/10.2210/pdb1CHN/pdb

• Classification: SIGNAL TRANSDUCTION PROTEIN
• Organism(s): Escherichia coli
• Mutation(s): No 


• Deposited: 1994-04-20 Released: 1994-07-31 
• Deposition Author(s): Bellsolell, L., Coll, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.76 Å
• R-Value Work: 
  0.191 (Depositor) 
• R-Value Observed: 
  0.191 (Depositor) 

Literature

Magnesium binding to the bacterial chemotaxis protein CheY results in large conformational changes involving its functional surface.

Bellsolell, L., Prieto, J., Serrano, L., Coll, M.

(1994) J Mol Biology 238: 489-495

• PubMed: 8176739 
• DOI: https://doi.org/10.1006/jmbi.1994.1308
• Primary Citation Related Structures: 
  1CHN


• PubMed Abstract: 
  

  The three-dimensional crystal structure of the bacterial chemotaxis protein CheY with the essential Mg2+ cation bound to the active site reveals large conformational changes caused by the metal binding. Displacements of up to 10 A are observed in several residues at the N terminus of alpha-helix 4 and in the preceding loop. One turn of this helix unwinds, and an Asn residue that was located inside the helix becomes the new N-cap. This supports the important role that N or C-cap residues play in alpha-helix stability. In addition the preceding beta-strand becomes elongated and a new beta-turn appears. The final effect is a significant modification of the surface relief of the protein in a region previously indicated, by genetic analysis, to be essential for CheY function. It is suggested that binding of a divalent cation to CheY could play a significant part in CheY activation and consequently in signal transduction in prokaryotes.

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Organizational Affiliation: 
• Departament de Biologia Molecular i Cel.lular, Centre d'Investigació iDesenvolupament, CSIC, Barcelona, Spain.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 14.01 kDa 
• Atom Count: 1,038 
• Modeled Residue Count: 126 
• Deposited Residue Count: 128 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CHEY	A	128	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for P0AE67 (Escherichia coli (strain K12)) Explore P0AE67  Go to UniProtKB:  P0AE67

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: 1.76 Å
• R-Value Work:  0.191 (Depositor) 
• R-Value Observed: 0.191 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 29.9	α = 90
b = 44.4	β = 102.9
c = 46.9	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1994-07-31 
Deposition Author(s): Bellsolell, L., Coll, M.

Revision History  

• Version 1.0: 1994-07-31
  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: Advisory, Derived calculations, Other
• Version 1.4: 2024-02-07
  Changes: Advisory, Data collection, Database references, Derived calculations