Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

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

Macromolecule Content

• Total Structure Weight: 45.98 kDa 
• Atom Count: 2925 
• Residue Count: 353 
• Unique protein chains: 3

2IZV

CRYSTAL STRUCTURE OF SOCS-4 IN COMPLEX WITH ELONGIN-B AND ELONGIN-C AT 2.55A RESOLUTION

• DOI: 10.2210/pdb2IZV/pdb

• Classification: TRANSCRIPTION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2006-07-26 Released: 2006-08-02 
• Deposition Author(s): Debreczeni, J.E., Bullock, A., Papagrigoriou, E., Turnbull, A., Pike, A.C.W., Gorrec, F., von Delft, F., Sundstrom, M., Arrowsmith, C., Weigelt, J., Edwards, A., Knapp, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.55 Å
• R-Value Free: 0.223 
• R-Value Work: 0.172 
• R-Value Observed: 0.175 

Literature

Structure of the SOCS4-ElonginB/C complex reveals a distinct SOCS box interface and the molecular basis for SOCS-dependent EGFR degradation.

Bullock, A.N., Rodriguez, M.C., Debreczeni, J.E., Songyang, Z., Knapp, S.

(2007) Structure 15: 1493-1504

• PubMed: 17997974 
• DOI: 10.1016/j.str.2007.09.016
• Primary Citation of Related Structures:  
  2IZV


• PubMed Abstract: 
  

Tyrosine kinase signaling is tightly controlled by negative feedback inhibitors including suppressors of cytokine signaling (SOCS). SOCS assemble as SH2 domain substrate recognition modules in ElonginB/C-cullin ubiquitin ligases. In accordance, SOCS4 reduces STAT3 signaling from EGFR through increased receptor degradation. Variable C-termini in SOCS4-SOCS7 exclude these family members from a SOCS2-type domain arrangement in which a strictly conserved C terminus determines domain packing. The structure of the SOCS4-ElonginC-ElonginB complex reveals a distinct SOCS structural class. The N-terminal ESS helix functionally replaces the CIS/SOCS1-SOCS3 family C terminus in a distinct SH2-SOCS box interface that facilitates further interdomain packing between the extended N- and C-terminal regions characteristic for this subfamily. Using peptide arrays and calorimetry the STAT3 site in EGFR (pY(1092)) was identified as a high affinity SOCS4 substrate (K(D) = 0.5 microM) revealing a mechanism for EGFR degradation. SOCS4 also bound JAK2 and KIT with low micromolar affinity, whereas SOCS2 was specific for GH-receptor.

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Organizational Affiliation: 

University of Oxford, Structural Genomics Consortium, Botnar Research Centre, Oxford OX3 7LD, United Kingdom. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SUPPRESSOR OF CYTOKINE SIGNALING 4	A	187	Homo sapiens	Mutation(s): 0  Gene Names: SOCS4, SOCS7
Find proteins for Q8WXH5 (Homo sapiens) Explore Q8WXH5  Go to UniProtKB:  Q8WXH5
NIH Common Fund Data Resources
PHAROS:  Q8WXH5 GTEx:  ENSG00000180008

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
TRANSCRIPTION ELONGATION FACTOR B POLYPEPTIDE 2	B	118	Homo sapiens	Mutation(s): 0  Gene Names: ELOB, TCEB2
Find proteins for Q15370 (Homo sapiens) Explore Q15370  Go to UniProtKB:  Q15370
NIH Common Fund Data Resources
PHAROS:  Q15370 GTEx:  ENSG00000103363

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
TRANSCRIPTION ELONGATION FACTOR B POLYPEPTIDE 1	C	97	Homo sapiens	Mutation(s): 0  Gene Names: ELOC, TCEB1
Find proteins for Q15369 (Homo sapiens) Explore Q15369  Go to UniProtKB:  Q15369
NIH Common Fund Data Resources
PHAROS:  Q15369 GTEx:  ENSG00000154582

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EDO	A	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N
CL	A	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA	A	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.55 Å
• R-Value Free: 0.223 
• R-Value Work: 0.172 
• R-Value Observed: 0.175 
• Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 154.77	α = 90
b = 154.77	β = 90
c = 67.909	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-07-26 
• Released Date: 2006-08-02 
Deposition Author(s): Debreczeni, J.E., Bullock, A., Papagrigoriou, E., Turnbull, A., Pike, A.C.W., Gorrec, F., von Delft, F., Sundstrom, M., Arrowsmith, C., Weigelt, J., Edwards, A., Knapp, S.

Revision History 

• Version 1.0: 2006-08-02
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.2: 2018-01-24
  Changes: Structure summary
• Version 1.3: 2018-02-28
  Changes: Database references, Source and taxonomy
• Version 1.4: 2019-05-08
  Changes: Data collection, Experimental preparation