1QJO

INNERMOST LIPOYL DOMAIN OF THE PYRUVATE DEHYDROGENASE FROM ESCHERICHIA COLI


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 60 
  • Conformers Submitted: 30 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Restricted motion of the lipoyl-lysine swinging arm in the pyruvate dehydrogenase complex of Escherichia coli.

Jones, D.D.Stott, K.M.Howard, M.J.Perham, R.N.

(2000) Biochemistry 39: 8448-8459


  • PubMed Abstract: 
  • The three lipoyl (E2plip) domains of the dihydrolipoyl acetyltransferase component of the pyruvate dehydrogenase (PDH) complex of Escherichia coli house the lipoyl-lysine side chain essential for active-site coupling and substrate channelling within ...

    The three lipoyl (E2plip) domains of the dihydrolipoyl acetyltransferase component of the pyruvate dehydrogenase (PDH) complex of Escherichia coli house the lipoyl-lysine side chain essential for active-site coupling and substrate channelling within the complex. The structure of the unlipoylated form of the innermost domain (E2plip(apo)) was determined by multidimensional NMR spectroscopy and found to resemble closely that of a nonfunctional hybrid domain determined previously [Green et al. (1995) J. Mol. Biol. 248, 328-343]. The domain comprises two four-stranded beta-sheets, with the target lysine residue residing at the tip of a type-I beta-turn in one of the sheets; the N- and C-termini lie close together at the opposite end of the molecule in the other beta-sheet. Measurement of (15)N NMR relaxation parameters and backbone hydrogen/deuterium (H/D) exchange rates reveals that the residues in and surrounding the lipoyl-lysine beta-turn in the E2plip(apo) form of the domain become less flexible after lipoylation of the lysine residue. This implies that the lipoyl-lysine side chain may not sample the full range of conformational space once thought. Moreover, reductive acetylation of the lipoylated domain (E2plip(holo) --> E2plip(redac)) was accompanied by large changes in chemical shift between the two forms, and multiple resonances were observed for several residues. This implies a change in conformation and the existence of multiple conformations of the domain on reductive acetylation, which may be important in stabilizing this catalytic intermediate.


    Related Citations: 
    • Protein-Protein Interaction Revealed by NMR T(2) Relaxation Experiments: The Lipoyl Domain and E1 Component of the Pyruvate Dehydrogenase Multienzyme Complex of Bacillus Stearothermophilus
      Howard, M.J.,Chauhan, H.J.,Domingo, G.J.,Fuller, C.,Perham, R.N.
      (2000) J.Mol.Biol. 295: 1023


    Organizational Affiliation

    Cambridge Centre for Molecular Recognition, Department of Biochemistry, University of Cambridge, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DIHYDROLIPOAMIDE ACETYLTRANSFERASE
A
80Escherichia coli (strain K12)Gene Names: aceF
EC: 2.3.1.12
Find proteins for P06959 (Escherichia coli (strain K12))
Go to UniProtKB:  P06959
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 60 
  • Conformers Submitted: 30 
  • Olderado: 1QJO Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-06-30
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-31
    Type: Data collection, Database references, Source and taxonomy