2MYJ

Solution structure of a bacterial chaperone


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 1.0 of the entry. See complete history

Literature

HdeB chaperone activity is coupled to its intrinsic dynamic properties.

Ding, J.Yang, C.Niu, X.Hu, Y.Jin, C.

(2015) Sci Rep 5: 16856-16856

  • DOI: 10.1038/srep16856

  • PubMed Abstract: 
  • Enteric bacteria encounter extreme acidity when passing through hosts' stomach. Since the bacterial periplasmic space quickly equilibrates with outer environment, an efficient acid resistance mechanism is essential in preventing irreversible protein ...

    Enteric bacteria encounter extreme acidity when passing through hosts' stomach. Since the bacterial periplasmic space quickly equilibrates with outer environment, an efficient acid resistance mechanism is essential in preventing irreversible protein denaturation/aggregation and maintaining bacteria viability. HdeB, along with its homolog HdeA, was identified as a periplasmic acid-resistant chaperone. Both proteins exist as homodimers and share similar monomeric structures under neutral pH, while showing different dimeric packing interfaces. Previous investigations show that HdeA functions through an acid-induced dimer-to-monomer transition and partial unfolding at low pH (pH 2-3), resulting in exposure of hydrophobic surfaces that bind substrate proteins. In contrast, HdeB appears to have a much higher optimal activation pH (pH 4-5), under which condition the protein maintains a well-folded dimer and the mechanism for its chaperone activity remains elusive. Herein, we present an NMR study of HdeB to investigate its dynamic properties. Our results reveal that HdeB undergoes significant micro- to milli-second timescale conformational exchanges at neutral to near-neutral pH, under the later condition it exhibits optimal activity. The current study indicates that HdeB activation is coupled to its intrinsic dynamics instead of structural changes, and therefore its functional mechanism is apparently different from HdeA.


    Organizational Affiliation

    College of Life Sciences, Peking University, Beijing 100871, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Acid stress chaperone HdeB
A, B
79Escherichia coli (strain K12)Gene Names: hdeB (yhhD, yhiC)
Find proteins for P0AET2 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AET2
Experimental Data & Validation

Experimental Data

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

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2015-01-27 
  • Released Date: 2016-01-06 
  • Deposition Author(s): Jin, C., Hu, Y., Ding, J.

Revision History 

  • Version 1.0: 2016-01-06
    Type: Initial release