2BYU

Negative stain EM reconstruction of M.tuberculosis Acr1(Hsp 16.3) fitted with wheat sHSP dimer


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 16.5 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Dodecameric Structure of the Small Heat Shock Protein Acr1 from Mycobacterium Tuberculosis.

Kennaway, C.K.Benesch, J.L.P.Gohlke, U.Wang, L.Robinson, C.V.Orlova, E.V.Saibil, H.R.Keep, N.H.

(2005) J.Biol.Chem. 280: 33419

  • DOI: 10.1074/jbc.M504263200

  • PubMed Abstract: 
  • Small heat shock proteins are a ubiquitous and diverse family of stress proteins that have in common an alpha-crystallin domain. Mycobacterium tuberculosis has two small heat shock proteins, Acr1 (alpha-crystallin-related protein 1, or Hsp16.3/16-kDa ...

    Small heat shock proteins are a ubiquitous and diverse family of stress proteins that have in common an alpha-crystallin domain. Mycobacterium tuberculosis has two small heat shock proteins, Acr1 (alpha-crystallin-related protein 1, or Hsp16.3/16-kDa antigen) and Acr2 (HrpA), both of which are highly expressed under different stress conditions. Small heat shock proteins form large oligomeric assemblies and are commonly polydisperse. Nanoelectrospray mass spectrometry showed that Acr2 formed a range of oligomers composed of dimers and tetramers, whereas Acr1 was a dodecamer. Electron microscopy of Acr2 showed a variety of particle sizes. Using three-dimensional analysis of negative stain electron microscope images, we have shown that Acr1 forms a tetrahedral assembly with 12 polypeptide chains. The atomic structure of a related alpha-crystallin domain dimer was docked into the density to build a molecular structure of the dodecameric Acr1 complex. Along with the differential regulation of these two proteins, the differences in their quaternary structures demonstrated here supports their distinct functional roles.


    Organizational Affiliation

    School of Crystallography and Institute of Structural Molecular Biology, Birkbeck, University of London, Malet Street, London WC1E 7HX.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HEAT SHOCK PROTEIN 16.9B
A, B, C, D, E, F, G, H, I, J, K, L
109Triticum aestivumGene Names: hsp16.9B
Find proteins for Q41560 (Triticum aestivum)
Go to UniProtKB:  Q41560
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 16.5 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-08-22
    Type: Initial release
  • Version 1.1: 2015-01-28
    Type: Other, Structure summary, Version format compliance
  • Version 1.2: 2017-08-30
    Type: Experimental preparation, Refinement description