2FEW

Complex of enzyme IIAMTL and phosphorylated enzyme IIBMTL from Escherichia coli NMR, restrained regularized mean structure


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 
  • Selection Criteria: REGULARIZED MEAN STRUCTURE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Solution Structure of a Post-transition State Analog of the Phosphotransfer Reaction between the A and B Cytoplasmic Domains of the Mannitol Transporter IIMannitol of the Escherichia coli Phosphotransferase System

Suh, J.Y.Cai, M.Williams Jr., D.C.Clore, G.M.

(2006) J Biol Chem 281: 8939-8949

  • DOI: 10.1074/jbc.M513466200
  • Primary Citation of Related Structures:  
    2FEW

  • PubMed Abstract: 
  • The solution structure of the post-transition state complex between the isolated cytoplasmic A (IIAMtl) and phosphorylated B (phospho-IIBMtl) domains of the mannitol transporter of the Escherichia coli phosphotransferase system has been solved by NMR ...

    The solution structure of the post-transition state complex between the isolated cytoplasmic A (IIAMtl) and phosphorylated B (phospho-IIBMtl) domains of the mannitol transporter of the Escherichia coli phosphotransferase system has been solved by NMR. The active site His-554 of IIAMtl was mutated to glutamine to block phosphoryl transfer activity, and the active site Cys-384 of IIBMtl (residues of IIBMtl are denoted in italic type) was substituted by serine to permit the formation of a stable phosphorylated form of IIBMtl. The two complementary interaction surfaces are predominantly hydrophobic, and two methionines on IIBMtl, Met-388 and Met-393, serve as anchors by interacting with two deep pockets on the surface of IIAMtl. With the exception of a salt bridge between the conserved Arg-538 of IIAMtl and the phosphoryl group of phospho-IIBMtl, electrostatic interactions between the two proteins are limited to the outer edges of the interface, are few in number, and appear to be weak. This accounts for the low affinity of the complex (Kd approximately 3.7 mm), which is optimally tuned to the intact biological system in which the A and B domains are expressed as a single polypeptide connected by a flexible 21-residue linker. The phosphoryl transition state can readily be modeled with no change in protein-protein orientation and minimal perturbations in both the backbone immediately adjacent to His-554 and Cys-384 and the side chains in close proximity to the phosphoryl group. Comparison with the previously solved structure of the IIAMtl-HPr complex reveals how IIAMtl uses the same interaction surface to recognize two structurally unrelated proteins and explains the much higher affinity of IIAMtl for HPr than IIBMtl.


    Organizational Affiliation

    Laboratory of Chemical Physics, NIDDK, National Institutes of Health, Bethesda, Maryland 20892, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PTS system mannitol-specific EIICBA componentA148Escherichia coliMutation(s): 1 
Gene Names: mtlA
EC: 2.7.1.69 (PDB Primary Data), 2.7.1.197 (UniProt)
Find proteins for P00550 (Escherichia coli (strain K12))
Explore P00550 
Go to UniProtKB:  P00550
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
mannitol-specific PTS system enzyme IIABC componentsB101Escherichia coli O157:H7Mutation(s): 1 
EC: 2.7.1.69 (PDB Primary Data), 2.7.1.197 (UniProt)
Find proteins for P00550 (Escherichia coli (strain K12))
Explore P00550 
Go to UniProtKB:  P00550
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
BL-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 
  • Selection Criteria: REGULARIZED MEAN STRUCTURE 
  • OLDERADO: 2FEW Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2005-12-16 
  • Released Date: 2006-02-07 
  • Deposition Author(s): Clore, G.M., Suh, J.Y.

Revision History 

  • Version 1.0: 2006-02-07
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance