2N0K

Chemical shift assignments and structure of the alpha-crystallin domain from human, HSPB5


Experimental Data Snapshot

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

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

A conserved histidine modulates HSPB5 structure to trigger chaperone activity in response to stress-related acidosis.

Rajagopal, P.Tse, E.Borst, A.J.Delbecq, S.P.Shi, L.Southworth, D.R.Klevit, R.E.

(2015) Elife 4

  • DOI: 10.7554/eLife.07304
  • Primary Citation of Related Structures:  
    2N0K

  • PubMed Abstract: 
  • Small heat shock proteins (sHSPs) are essential 'holdase' chaperones that form large assemblies and respond dynamically to pH and temperature stresses to protect client proteins from aggregation. While the alpha-crystallin domain (ACD) dimer of sHSPs is the universal building block, how the ACD transmits structural changes in response to stress to promote holdase activity is unknown ...

    Small heat shock proteins (sHSPs) are essential 'holdase' chaperones that form large assemblies and respond dynamically to pH and temperature stresses to protect client proteins from aggregation. While the alpha-crystallin domain (ACD) dimer of sHSPs is the universal building block, how the ACD transmits structural changes in response to stress to promote holdase activity is unknown. We found that the dimer interface of HSPB5 is destabilized over physiological pHs and a conserved histidine (His-104) controls interface stability and oligomer structure in response to acidosis. Destabilization by pH or His-104 mutation shifts the ACD from dimer to monomer but also results in a large expansion of HSPB5 oligomer states. Remarkably, His-104 mutant-destabilized oligomers are efficient holdases that reorganize into structurally distinct client-bound complexes. Our data support a model for sHSP function wherein cell stress triggers small perturbations that alter the ACD building blocks to unleash a cryptic mode of chaperone action.


    Related Citations: 
    • alphaB-crystallin: a hybrid solid-state/solution-state NMR investigation reveals structural aspects of the heterogeneous oligomer.
      Jehle, S., van Rossum, B., Stout, J.R., Noguchi, S.M., Falber, K., Rehbein, K., Oschkinat, H., Klevit, R.E., Rajagopal, P.
      (2009) J Mol Biol 385: 1481
    • Solid-state NMR and SAXS studies provide a structural basis for the activation of alphaB-crystallin oligomers.
      Jehle, S., Rajagopal, P., Bardiaux, B., Markovic, S., Kuhne, R., Stout, J.R., Higman, V.A., Klevit, R.E., van Rossum, B.J., Oschkinat, H.
      (2010) Nat Struct Mol Biol 17: 1037
    • N-terminal domain of alphaB-crystallin provides a conformational switch for multimerization and structural heterogeneity.
      Jehle, S., Vollmar, B.S., Bardiaux, B., Dove, K.K., Rajagopal, P., Gonen, T., Oschkinat, H., Klevit, R.E.
      (2011) Proc Natl Acad Sci U S A 108: 6409

    Organizational Affiliation

    Department of Biochemistry, University of Washington, Seattle, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Alpha-crystallin B chainA, B89Homo sapiensMutation(s): 1 
Gene Names: CRYA2CRYABHSPB5
UniProt & NIH Common Fund Data Resources
Find proteins for P02511 (Homo sapiens)
Explore P02511 
Go to UniProtKB:  P02511
PHAROS:  P02511
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02511
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

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

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-06-03
    Type: Initial release
  • Version 1.1: 2015-07-22
    Changes: Database references
  • Version 1.2: 2017-02-15
    Changes: Database references