1YMU

SIGNAL TRANSDUCTION PROTEIN CHEY MUTANT WITH MET 17 REPLACED BY GLY (M17G)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The three-dimensional structure of two mutants of the signal transduction protein CheY suggest its molecular activation mechanism.

Bellsolell, L.Cronet, P.Majolero, M.Serrano, L.Coll, M.

(1996) J.Mol.Biol. 257: 116-128

  • DOI: 10.1006/jmbi.1996.0151
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The three-dimensional crystal structures of the single mutant M17G and the triple mutant F14G-S15G-M17G of the response regulator protein CheY have been determined to 2.3 and 1.9 angstrom, respectively. Both mutants bind the essential Mg2+ cation as ...

    The three-dimensional crystal structures of the single mutant M17G and the triple mutant F14G-S15G-M17G of the response regulator protein CheY have been determined to 2.3 and 1.9 angstrom, respectively. Both mutants bind the essential Mg2+ cation as determined by the changes in stability, but binding does not cause the intrinsic fluorescence quenching of W58 observed in the wild-type protein. The loop beta4-alpha4 appears to be very flexible in both mutants and helix alpha4, which starts at N94 in the native Mg2+-CheY and at K91 in the native apo-CheY, starts in both mutants at residue K92. The side-chain of K109 appears to be more mobile because of the space freed by the M17G mutation. In the triple mutant the main chain of K109 and adjacent residues (loop beta5-alpha5) is displaced almost by 2 angstrom affecting the main chain at residues T87 to E89 (C terminus of beta4). The triple mutant structure has a Mg2+ bound at the active site, but although the Mg2+ coordination is similar to that of the native Mg2+-CheY, the structural consequences of the metal binding are quite different. It seems that the mutations have disrupted the mechanism of movement transmission observed in the native protein. We suggest that the side-chain of K109, packed between V86, A88 and M17 in the native protein, slides forwards and backwards upon activation and deactivation dragging the main chain at the loop beta5-alpha5 and triggering larger movements at the functional surface of the protein.


    Related Citations: 
    • Investigating the Structural Determinants of the P21-Like Triphosphate and Mg2+ Binding Site
      Cronet, P.,Bellsolell, L.,Sander, C.,Coll, M.,Serrano, L.
      (1995) J.Mol.Biol. 249: 654
    • 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.Biol. 238: 489


    Organizational Affiliation

    Departament de Biologia Molecular i Cel-lular Centre d'Investigacio i Desenvolupament-CSIC, Barcelona, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CHEY
A, B
130Escherichia coli (strain K12)Mutation(s): 1 
Gene Names: cheY
Find proteins for P0AE67 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AE67
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Work: 0.198 
  • Space Group: P 31
Unit Cell:
Length (Å)Angle (°)
a = 53.400α = 90.00
b = 53.400β = 90.00
c = 92.000γ = 120.00
Software Package:
Software NamePurpose
X-PLORphasing
XDSdata reduction
X-PLORrefinement
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-04-03
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance