5BO4

Structure of SOCS2:Elongin C:Elongin B from DMSO-treated crystals


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.232 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Serendipitous SAD Solution for DMSO-Soaked SOCS2-ElonginC-ElonginB Crystals Using Covalently Incorporated Dimethylarsenic: Insights into Substrate Receptor Conformational Flexibility in Cullin RING Ligases.

Gadd, M.S.Bulatov, E.Ciulli, A.

(2015) PLoS One 10: e0131218-e0131218

  • DOI: 10.1371/journal.pone.0131218
  • Primary Citation of Related Structures:  
    5BO4

  • PubMed Abstract: 
  • Suppressor of cytokine signalling 2 (SOCS2) is the substrate-binding component of a Cullin-RING E3 ubiquitin ligase (CRL) complex that targets phosphorylated hormone receptors for degradation by the ubiquitin-proteasome system. As a key regulator of the transcriptional response to growth signals, SOCS2 and its protein complex partners are potential targets for small molecule development ...

    Suppressor of cytokine signalling 2 (SOCS2) is the substrate-binding component of a Cullin-RING E3 ubiquitin ligase (CRL) complex that targets phosphorylated hormone receptors for degradation by the ubiquitin-proteasome system. As a key regulator of the transcriptional response to growth signals, SOCS2 and its protein complex partners are potential targets for small molecule development. We found that crystals of SOCS2 in complex with its adaptor proteins, Elongin C and Elongin B, underwent a change in crystallographic parameters when treated with dimethyl sulfoxide during soaking experiments. To solve the phase problem for the new crystal form we identified the presence of arsenic atoms in the crystals, a result of covalent modification of cysteines by cacodylate, and successfully extracted anomalous signal from these atoms for experimental phasing. The resulting structure provides a means for solving future structures where the crystals must be treated with DMSO for ligand soaking approaches. Additionally, the conformational changes induced in this structure reveal flexibility within SOCS2 that match those postulated by previous molecular dynamics simulations. This conformational flexibility illustrates how SOCS2 can orient its substrates for successful ubiquitination by other elements of the CRL complex.


    Organizational Affiliation

    Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, James Black Centre, Dow Street, Dundee, United Kingdom.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Suppressor of cytokine signaling 2
A, D, G, J, M, P
A, D, G, J, M, P
169Homo sapiensMutation(s): 0 
Gene Names: SOCS2CIS2SSI2STATI2
UniProt & NIH Common Fund Data Resources
Find proteins for O14508 (Homo sapiens)
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PHAROS:  O14508
GTEx:  ENSG00000120833 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14508
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Transcription elongation factor B polypeptide 2
B, E, H, K, N, Q
B, E, H, K, N, Q
104Homo sapiensMutation(s): 0 
Gene Names: TCEB2ELOB
UniProt & NIH Common Fund Data Resources
Find proteins for Q15370 (Homo sapiens)
Explore Q15370 
Go to UniProtKB:  Q15370
PHAROS:  Q15370
GTEx:  ENSG00000103363 
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UniProt GroupQ15370
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Transcription elongation factor B polypeptide 1
C, F, I, L, O, R
C, F, I, L, O, R
97Homo sapiensMutation(s): 0 
Gene Names: TCEB1ELOC
UniProt & NIH Common Fund Data Resources
Find proteins for Q15369 (Homo sapiens)
Explore Q15369 
Go to UniProtKB:  Q15369
PHAROS:  Q15369
GTEx:  ENSG00000154582 
Entity Groups  
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UniProt GroupQ15369
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CAS
Query on CAS
A, D, G, J, M, P
A, D, G, J, M, P
L-PEPTIDE LINKINGC5 H12 As N O2 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.232 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 185.217α = 90
b = 185.217β = 90
c = 67.204γ = 120
Software Package:
Software NamePurpose
Aimlessdata scaling
SOLVEphasing
RESOLVEmodel building
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research Council--

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-08
    Type: Initial release
  • Version 1.1: 2017-10-18
    Changes: Data collection