3HQM

Structures of SPOP-Substrate Complexes: Insights into Molecular Architectures of BTB-Cul3 Ubiquitin Ligases: SPOPMATHx-CiSBC2

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.74 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

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Literature

Structures of SPOP-substrate complexes: insights into molecular architectures of BTB-Cul3 ubiquitin ligases.

Zhuang, M., Calabrese, M.F., Liu, J., Waddell, M.B., Nourse, A., Hammel, M., Miller, D.J., Walden, H., Duda, D.M., Seyedin, S.N., Hoggard, T., Harper, J.W., White, K.P., Schulman, B.A.

(2009) Mol Cell 36: 39-50

  • DOI: 10.1016/j.molcel.2009.09.022
  • Primary Citation of Related Structures:  
    3HQL, 3HQM, 3HQH, 3HQI, 3HSV, 3HU6, 3HTM, 3HVE, 3IVQ, 3IVV

  • PubMed Abstract: 

    • In the largest E3 ligase subfamily, Cul3 binds a BTB domain, and an associated protein-interaction domain such as MATH recruits substrates for ubiquitination. Here, we present biochemical and structural analyses of the MATH-BTB protein, SPOP. We define a SPOP-binding consensus (SBC) and determine structures revealing recognition of SBCs from the phosphatase Puc, the transcriptional regulator Ci, and the chromatin component MacroH2A ...

    In the largest E3 ligase subfamily, Cul3 binds a BTB domain, and an associated protein-interaction domain such as MATH recruits substrates for ubiquitination. Here, we present biochemical and structural analyses of the MATH-BTB protein, SPOP. We define a SPOP-binding consensus (SBC) and determine structures revealing recognition of SBCs from the phosphatase Puc, the transcriptional regulator Ci, and the chromatin component MacroH2A. We identify a dimeric SPOP-Cul3 assembly involving a conserved helical structure C-terminal of BTB domains, which we call "3-box" due to its facilitating Cul3 binding and its resemblance to F-/SOCS-boxes in other cullin-based E3s. Structural flexibility between the substrate-binding MATH and Cul3-binding BTB/3-box domains potentially allows a SPOP dimer to engage multiple SBCs found within a single substrate, such as Puc. These studies provide a molecular understanding of how MATH-BTB proteins recruit substrates to Cul3 and how their dimerization and conformational variability may facilitate avid interactions with diverse substrates.

    Organizational Affiliation: 

    Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Speckle-type POZ proteinA, B145Homo sapiensMutation(s): 1 
Gene Names: SPOP
Find proteins for O43791 (Homo sapiens)
Explore O43791 
Go to UniProtKB:  O43791
NIH Common Fund Data Resources
PHAROS:  O43791
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Protein cubitus interruptusC, D12N/AMutation(s): 0 
Find proteins for P19538 (Drosophila melanogaster)
Explore P19538 
Go to UniProtKB:  P19538
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.74 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.281α = 63
b = 48.1β = 64.04
c = 49.86γ = 62.89
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-10-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance