2K7V

Deletions in a surface loop divert the folding of a protein domain into a metastable dimeric form


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A surface loop directs conformational switching of a lipoyl domain between a folded and a novel misfolded structure.

Stott, K.M.Yusof, A.M.Perham, R.N.Jones, D.D.

(2009) Structure 17: 1117-1127

  • DOI: 10.1016/j.str.2009.07.001

  • PubMed Abstract: 
  • A prominent surface loop links the first two beta strands of the lipoyl domain (E2plip) from the pyruvate dehydrogenase multienzyme complex of Escherichia coli. We show here that shortening this loop by two residues generates a protein that populates ...

    A prominent surface loop links the first two beta strands of the lipoyl domain (E2plip) from the pyruvate dehydrogenase multienzyme complex of Escherichia coli. We show here that shortening this loop by two residues generates a protein that populates two structurally distinct stable conformers: an active, native-like monomer (HM) and a functionally compromised misfolded dimer (LM). Conversion of LM to HM was observed after exposure to temperatures above 50 degrees C. Removal of two additional residues from the loop caused the protein to adopt exclusively the misfolded conformation. Detailed NMR structural studies of the misfolded dimer reveal that the N-terminal half of the domain was unfolded and dynamic, whereas the C-terminal halves of two monomers had associated to form a structure with two-fold symmetry and a topology mimicking that of the folded monomer. The surface loop is therefore a hitherto unsuspected determinant in the folding process that leads to a functional protein.


    Organizational Affiliation

    Department of Biochemistry, University of Cambridge, Cambridge, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex
A, B
85Escherichia 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: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2K7V Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-09-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance