2LHK

Structural analysis of a chaperone in type III secretion system


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 15 
  • Selection Criteria: 20 structures for lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural instability tuning as a regulatory mechanism in protein-protein interactions.

Chen, L.Balabanidou, V.Remeta, D.P.Minetti, C.A.Portaliou, A.G.Economou, A.Kalodimos, C.G.

(2011) Mol.Cell 44: 734-744

  • DOI: 10.1016/j.molcel.2011.09.022

  • PubMed Abstract: 
  • Protein-protein interactions mediate a vast number of cellular processes. Here, we present a regulatory mechanism in protein-protein interactions mediated by finely tuned structural instability and coupled with molecular mimicry. We show that a set o ...

    Protein-protein interactions mediate a vast number of cellular processes. Here, we present a regulatory mechanism in protein-protein interactions mediated by finely tuned structural instability and coupled with molecular mimicry. We show that a set of type III secretion (TTS) autoinhibited homodimeric chaperones adopt a molten globule-like state that transiently exposes the substrate binding site as a means to become rapidly poised for binding to their cognate protein substrates. Packing defects at the homodimeric interface stimulate binding, whereas correction of these defects results in less labile chaperones that give rise to nonfunctional biological systems. The protein substrates use structural mimicry to offset the weak spots in the chaperones and to counteract their autoinhibitory conformation. This regulatory mechanism of protein activity is evolutionarily conserved among several TSS systems and presents a lucid example of functional advantage conferred upon a biological system by finely tuned structural instability.


    Organizational Affiliation

    Department of Chemistry & Chemical Biology, Rutgers University, Piscataway, NJ 08854, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
L0052
A, B
107Escherichia coliGene Names: orf3
Find proteins for O52124 (Escherichia coli)
Go to UniProtKB:  O52124
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 15 
  • Selection Criteria: 20 structures for lowest energy 
  • Olderado: 2LHK Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-12-28
    Type: Initial release