2L5H

Solution Structure of the H189Q mutant of the Enzyme I dimer Using Residual Dipolar Couplings and Small Angle X-Ray Scattering


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 120 
  • Conformers Submitted: 
  • Selection Criteria: target function 

  • Method: SOLUTION SCATTERING

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Combined Use of Residual Dipolar Couplings and Solution X-ray Scattering To Rapidly Probe Rigid-Body Conformational Transitions in a Non-phosphorylatable Active-Site Mutant of the 128 kDa Enzyme I Dimer.

Takayama, Y.Schwieters, C.D.Grishaev, A.Ghirlando, R.Clore, G.M.

(2011) J Am Chem Soc 133: 424-427

  • DOI: 10.1021/ja109866w
  • Primary Citation of Related Structures:  
    2L5H

  • PubMed Abstract: 
  • The first component of the bacterial phosphotransferase system, enzyme I (EI), is a multidomain 128 kDa dimer that undergoes large rigid-body conformational transitions during the course of its catalytic cycle. Here we investigate the solution struct ...

    The first component of the bacterial phosphotransferase system, enzyme I (EI), is a multidomain 128 kDa dimer that undergoes large rigid-body conformational transitions during the course of its catalytic cycle. Here we investigate the solution structure of a non-phosphorylatable active-site mutant in which the active-site histidine is substituted by glutamine. We show that perturbations in the relative orientations and positions of the domains and subdomains can be rapidly and reliably determined by conjoined rigid-body/torsion angle/Cartesian simulated annealing calculations driven by orientational restraints from residual dipolar couplings and shape and translation information afforded by small- and wide-angle X-ray scattering. Although histidine and glutamine are isosteric, the conformational space available to a Gln side chain is larger than that for the imidazole ring of His. An additional hydrogen bond between the side chain of Gln189 located on the EIN(α/β) subdomain and an aspartate (Asp129) on the EIN(α) subdomain results in a small (∼9°) reorientation of the EIN(α) and EIN(α/β) subdomains that is in turn propagated to a larger reorientation (∼26°) of the EIN domain relative to the EIC dimerization domain, illustrating the positional sensitivity of the EIN domain and its constituent subdomains to small structural perturbations.


    Organizational Affiliation

    Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Phosphoenolpyruvate-protein phosphotransferaseAB573Escherichia coliMutation(s): 1 
Gene Names: ptsIb2416JW2409
EC: 2.7.3.9
Find proteins for P08839 (Escherichia coli (strain K12))
Explore P08839 
Go to UniProtKB:  P08839
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 120 
  • Conformers Submitted: 
  • Selection Criteria: target function 
  • OLDERADO: 2L5H Olderado
  • Method: SOLUTION SCATTERING

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-01-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-04-25
    Changes: Database references