Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 6-mer - A2B2C2 

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

Macromolecule Content

• Total Structure Weight: 33.69 kDa 
• Atom Count: 2337 
• Modelled Residue Count: 299 
• Deposited Residue Count: 299 
• Unique protein chains: 3

2PJY

Structural basis for cooperative assembly of the TGF-beta signaling complex

• DOI: 10.2210/pdb2PJY/pdb

• Classification: CYTOKINE/CYTOKINE RECEPTOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2007-04-16 Released: 2008-02-05 
• Deposition Author(s): Groppe, J., Zubieta, C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.297 
• R-Value Work: 0.242 
• R-Value Observed: 0.244 

Literature

Cooperative assembly of TGF-beta superfamily signaling complexes is mediated by two disparate mechanisms and distinct modes of receptor binding.

Groppe, J., Hinck, C.S., Samavarchi-Tehrani, P., Zubieta, C., Schuermann, J.P., Taylor, A.B., Schwarz, P.M., Wrana, J.L., Hinck, A.P.

(2008) Mol Cell 29: 157-168

• PubMed: 18243111 
• DOI: 10.1016/j.molcel.2007.11.039
• Primary Citation of Related Structures:  
  2PJY


• PubMed Abstract: 
  

Dimeric ligands of the transforming growth factor-beta (TGF-beta) superfamily signal across cell membranes in a distinctive manner by assembling heterotetrameric complexes of structurally related serine/threonine-kinase receptor pairs. Unlike complexes of the bone morphogenetic protein (BMP) branch that apparently form due to avidity from membrane localization, TGF-beta complexes assemble cooperatively through recruitment of the low-affinity (type I) receptor by the ligand-bound high-affinity (type II) pair. Here we report the crystal structure of TGF-beta3 in complex with the extracellular domains of both pairs of receptors, revealing that the type I docks and becomes tethered via unique extensions at a composite ligand-type II interface. Disrupting the receptor-receptor interactions conferred by these extensions abolishes assembly of the signaling complex and signal transduction (Smad activation). Although structurally similar, BMP and TGF-beta receptors bind in dramatically different modes, mediating graded and switch-like assembly mechanisms that may have coevolved with branch-specific groups of cytoplasmic effectors.

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Organizational Affiliation: 

Department of Biochemistry, University of Texas Health Science Center, San Antonio, TX 78229, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transforming growth factor beta-3	A	112	Homo sapiens	Mutation(s): 0  Gene Names: TGFB3
Find proteins for P10600 (Homo sapiens) Explore P10600  Go to UniProtKB:  P10600
NIH Common Fund Data Resources
PHAROS:  P10600 GTEx:  ENSG00000119699

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
TGF-beta receptor type-2	B	108	Homo sapiens	Mutation(s): 1  Gene Names: TGFBR2 EC: 2.7.11.30
Find proteins for P37173 (Homo sapiens) Explore P37173  Go to UniProtKB:  P37173
NIH Common Fund Data Resources
PHAROS:  P37173 GTEx:  ENSG00000163513

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
TGF-beta receptor type-1	C	79	Homo sapiens	Mutation(s): 1  Gene Names: TGFBR1, ALK5, SKR4 EC: 2.7.11.30
Find proteins for P36897 (Homo sapiens) Explore P36897  Go to UniProtKB:  P36897
NIH Common Fund Data Resources
PHAROS:  P36897 GTEx:  ENSG00000106799

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.297 
• R-Value Work: 0.242 
• R-Value Observed: 0.244 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 66.92	α = 90
b = 66.92	β = 90
c = 254.36	γ = 120

Software Package:

Software Name	Purpose
XSCALE	data scaling
MOLREP	phasing
SOLVE	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
XDS	data scaling
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-04-16 
• Released Date: 2008-02-05 
Deposition Author(s): Groppe, J., Zubieta, C.

Revision History  

• Version 1.0: 2008-02-05
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance