1HEY

INVESTIGATING THE STRUCTURAL DETERMINANTS OF THE P21-LIKE TRIPHOSPHATE AND MG2+ BINDING SITE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.24 Å
  • R-Value Work: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 654-664

  • DOI: 10.1006/jmbi.1995.0326

  • PubMed Abstract: 
  • Amongst the superfamily of nucleotide binding proteins, the classical mononucleotide binding fold (CMBF), is the one that has been best characterized structurally. The common denominator of all the members is the triphosphate/Mg2+ binding site, whose ...

    Amongst the superfamily of nucleotide binding proteins, the classical mononucleotide binding fold (CMBF), is the one that has been best characterized structurally. The common denominator of all the members is the triphosphate/Mg2+ binding site, whose signature has been recognized as two structurally conserved stretches of residues: the Kinase 1 and 2 motifs that participate in triphosphate and Mg2+ binding, respectively. The Kinase 1 motif is borne by a loop (the P-loop), whose structure is conserved throughout the whole CMBF family. The low sequence similarity between the different members raises questions about which interactions are responsible for the active structure of the P-loop. What are the minimal requirements for the active structure of the P-loop? Why is the P-loop structure conserved despite the diverse environments in which it is found? To address this question, we have engineered the Kinase 1 and 2 motifs into a protein that has the CMBF and no nucleotide binding activity, the chemotactic protein from Escherichia coli, CheY. The mutant does not exhibit any triphosphate/Mg2+ binding activity. The crystal structure of the mutant reveals that the engineered P-loop is in a different conformation than that found in the CMBF. This demonstrates that the native structure of the P-loop requires external interactions with the rest of the protein. On the basis of an analysis of the conserved tertiary contacts of the P-loop in the mononucleotide binding superfamily, we propose a set of residues that could play an important role in the acquisition of the active structure of the P-loop.


    Related Citations: 
    • 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

    European Molecular Biology Laboratory, Heidelberg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CHEY
A
128Escherichia coli (strain K12)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: 2.24 Å
  • R-Value Work: 0.200 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 60.510α = 90.00
b = 60.510β = 90.00
c = 129.560γ = 120.00
Software Package:
Software NamePurpose
X-PLORphasing
XDSdata reduction
X-PLORmodel building
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-07-10
    Type: Initial release
  • Version 1.1: 2008-03-21
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance