6F2R

A heterotetramer of human HspB2 and HspB3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.90 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.297 
  • R-Value Observed: 0.298 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Terminal Regions Confer Plasticity to the Tetrameric Assembly of Human HspB2 and HspB3.

Clark, A.R.Vree Egberts, W.Kondrat, F.D.L.Hilton, G.R.Ray, N.J.Cole, A.R.Carver, J.A.Benesch, J.L.P.Keep, N.H.Boelens, W.C.Slingsby, C.

(2018) J Mol Biol 430: 3297-3310

  • DOI: https://doi.org/10.1016/j.jmb.2018.06.047
  • Primary Citation of Related Structures:  
    6F2R

  • PubMed Abstract: 

    Heterogeneity in small heat shock proteins (sHsps) spans multiple spatiotemporal regimes-from fast fluctuations of part of the protein, to conformational variability of tertiary structure, plasticity of the interfaces, and polydispersity of the inter-converting, and co-assembling oligomers. This heterogeneity and dynamic nature of sHsps has significantly hindered their structural characterization. Atomic coordinates are particularly lacking for vertebrate sHsps, where most available structures are of extensively truncated homomers. sHsps play important roles in maintaining protein levels in the cell and therefore in organismal health and disease. HspB2 and HspB3 are vertebrate sHsps that are found co-assembled in neuromuscular cells, and variants thereof are associated with disease. Here, we present the structure of human HspB2/B3, which crystallized as a hetero-tetramer in a 3:1 ratio. In the HspB2/B3 tetramer, the four α-crystallin domains (ACDs) assemble into a flattened tetrahedron which is pierced by two non-intersecting approximate dyads. Assembly is mediated by flexible "nuts and bolts" involving IXI/V motifs from terminal regions filling ACD pockets. Parts of the N-terminal region bind in an unfolded conformation into the anti-parallel shared ACD dimer grooves. Tracts of the terminal regions are not resolved, most likely due to their disorder in the crystal lattice. This first structure of a full-length human sHsp heteromer reveals the heterogeneous interactions of the terminal regions and suggests a plasticity that is important for the cytoprotective functions of sHsps.


  • Organizational Affiliation

    Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Rd, Oxford, OX1 3QZ, UK.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HspB2,Heat shock protein beta-2,Heat shock protein beta-2,Heat shock protein beta-2,Heat shock protein beta-2,Heat shock protein beta-2A,
D [auth E],
G [auth I]
213Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q16082 (Homo sapiens)
Explore Q16082 
Go to UniProtKB:  Q16082
PHAROS:  Q16082
GTEx:  ENSG00000170276 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16082
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
HspB2,Heat shock protein beta-2,Heat shock protein beta-2,Heat shock protein beta-2,Heat shock protein beta-2,Heat shock protein beta-2B [auth C],
F [auth G],
I [auth K]
203Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q16082 (Homo sapiens)
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Go to UniProtKB:  Q16082
PHAROS:  Q16082
GTEx:  ENSG00000170276 
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Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16082
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Heat shock protein beta-2C [auth D],
N [auth F],
O [auth J]
182Homo sapiensMutation(s): 0 
Gene Names: HSPB2
UniProt & NIH Common Fund Data Resources
Find proteins for Q16082 (Homo sapiens)
Explore Q16082 
Go to UniProtKB:  Q16082
PHAROS:  Q16082
GTEx:  ENSG00000170276 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16082
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Heat shock protein beta-3,Heat shock protein beta-3,Heat shock protein beta-3,Heat shock protein beta-3,Heat shock protein beta-2E [auth T],
H [auth V],
M [auth Q]
161Homo sapiensMutation(s): 0 
Gene Names: HSPB3HSP27HSPL27HSPB2
UniProt & NIH Common Fund Data Resources
Find proteins for Q12988 (Homo sapiens)
Explore Q12988 
Go to UniProtKB:  Q12988
PHAROS:  Q12988
GTEx:  ENSG00000169271 
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UniProt GroupQ12988
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Unknown peptide from HspB2 or HspB3J [auth M]10Homo sapiensMutation(s): 0 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Unknown peptide from HspB2 or HspB3K [auth N]7Homo sapiensMutation(s): 0 
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Unknown peptide from HspB2 or HspB3L [auth O]6Homo sapiensMutation(s): 0 
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Unknown peptide from HspB2 or HspB3P [auth 1],
Q [auth 2],
R [auth 3]
5Homo sapiensMutation(s): 0 
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Unknown peptide from HspB2 or HspB3S [auth W],
T [auth X],
U [auth Y]
12Homo sapiensMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.90 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.297 
  • R-Value Observed: 0.298 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 177.139α = 90
b = 177.139β = 90
c = 126.461γ = 120
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Medical Research Council (United Kingdom)United KingdomG0801846

Revision History  (Full details and data files)

  • Version 1.0: 2018-07-25
    Type: Initial release
  • Version 1.1: 2019-08-21
    Changes: Data collection, Database references, Structure summary
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Refinement description