Biological Assembly 1  

 3D View: Structure | Electron Density | Validation Report

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 11.94 kDa 
• Atom Count: 604 
• Modelled Residue Count: 64 
• Deposited Residue Count: 110 
• Unique protein chains: 1

4HS2

Crystal Structure of the Human SPOP C-terminal Domain

• DOI: 10.2210/pdb4HS2/pdb

• Classification: PROTEIN BINDING
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2012-10-29 Released: 2013-09-11 
• Deposition Author(s): Van Geersdaele, L.K., Stead, M.A., Carr, S.B., Wright, S.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.53 Å
• R-Value Free: 0.151 
• R-Value Work: 0.132 
• R-Value Observed: 0.133 

Literature

Structural basis of high-order oligomerization of the cullin-3 adaptor SPOP.

van Geersdaele, L.K., Stead, M.A., Harrison, C.M., Carr, S.B., Close, H.J., Rosbrook, G.O., Connell, S.D., Wright, S.C.

(2013) Acta Crystallogr D Biol Crystallogr 69: 1677-1684

• PubMed: 23999291 
• DOI: 10.1107/S0907444913012687
• Primary Citation of Related Structures:  
  4HS2, 4J8Z


• PubMed Abstract: 
  

Protein ubiquitination in eukaryotic cells is mediated by diverse E3 ligase enzymes that each target specific substrates. The cullin E3 ligase complexes are the most abundant class of E3 ligases; they contain various cullin components that serve as scaffolds for interaction with substrate-recruiting adaptor proteins. SPOP is a BTB-domain adaptor of the cullin-3 E3 ligase complexes; it selectively recruits substrates via its N-terminal MATH domain, whereas its BTB domain mediates dimerization and interactions with cullin-3. It has recently been recognized that the high-order oligomerization of SPOP enhances the ubiquitination of substrates. Here, a dimerization interface in the SPOP C-terminus is identified and it is shown that the dimerization interfaces of the BTB domain and of the C-terminus act independently and in tandem to generate high-order SPOP oligomers. The crystal structure of the dimeric SPOP C-terminal domain is reported at 1.5 Å resolution and it is shown that Tyr353 plays a critical role in high-order oligomerization. A model of the high-order SPOP oligomer is presented that depicts a helical organization that could enhance the efficiency of substrate ubiquitination.

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Organizational Affiliation: 

School of Biology, University of Leeds, Leeds LS2 9JT, England.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Speckle-type POZ protein	A	110	Homo sapiens	Mutation(s): 3  Gene Names: SPOP
UniProt & NIH Common Fund Data Resources
Find proteins for O43791 (Homo sapiens) Explore O43791  Go to UniProtKB:  O43791
PHAROS:  O43791

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.53 Å
• R-Value Free: 0.151 
• R-Value Work: 0.132 
• R-Value Observed: 0.133 
• Space Group: P 6₁ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 57.65	α = 90
b = 57.65	β = 90
c = 102.81	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
XDS	data scaling
XDS	data reduction
SCALA	data scaling
SHELXS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-10-29 
• Released Date: 2013-09-11 
Deposition Author(s): Van Geersdaele, L.K., Stead, M.A., Carr, S.B., Wright, S.C.

Revision History  

• Version 1.0: 2013-09-11
  Type: Initial release
  
• Version 1.1: 2014-01-15
  Changes: Database references