3KFD

Ternary complex of TGF-b1 reveals isoform-specific ligand recognition and receptor recruitment in the superfamily


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.995 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Ternary complex of transforming growth factor-beta1 reveals isoform-specific ligand recognition and receptor recruitment in the superfamily.

Radaev, S.Zou, Z.Huang, T.Lafer, E.M.Hinck, A.P.Sun, P.D.

(2010) J.Biol.Chem. 285: 14806-14814

  • DOI: 10.1074/jbc.M109.079921

  • PubMed Abstract: 
  • Transforming growth factor (TGF)-beta1, -beta2, and -beta3 are 25-kDa homodimeric polypeptides that play crucial nonoverlapping roles in embryogenesis, tissue development, carcinogenesis, and immune regulation. Here we report the 3.0-A resolution cry ...

    Transforming growth factor (TGF)-beta1, -beta2, and -beta3 are 25-kDa homodimeric polypeptides that play crucial nonoverlapping roles in embryogenesis, tissue development, carcinogenesis, and immune regulation. Here we report the 3.0-A resolution crystal structure of the ternary complex between human TGF-beta1 and the extracellular domains of its type I and type II receptors, TbetaRI and TbetaRII. The TGF-beta1 ternary complex structure is similar to previously reported TGF-beta3 complex except with a 10 degrees rotation in TbetaRI docking orientation. Quantitative binding studies showed distinct kinetics between the receptors and the isoforms of TGF-beta. TbetaRI showed significant binding to TGF-beta2 and TGF-beta3 but not TGF-beta1, and the binding to all three isoforms of TGF-beta was enhanced considerably in the presence of TbetaRII. The preference of TGF-beta2 to TbetaRI suggests a variation in its receptor recruitment in vivo. Although TGF-beta1 and TGF-beta3 bind and assemble their ternary complexes in a similar manner, their structural differences together with differences in the affinities and kinetics of their receptor binding may underlie their unique biological activities. Structural comparisons revealed that the receptor-ligand pairing in the TGF-beta superfamily is dictated by unique insertions, deletions, and disulfide bonds rather than amino acid conservation at the interface. The binding mode of TbetaRII on TGF-beta is unique to TGF-betas, whereas that of type II receptor for bone morphogenetic protein on bone morphogenetic protein appears common to all other cytokines in the superfamily. Further, extensive hydrogen bonds and salt bridges are present at the high affinity cytokine-receptor interfaces, whereas hydrophobic interactions dominate the low affinity receptor-ligand interfaces.


    Organizational Affiliation

    Structural Immunology Section, Laboratory of Immunogenetics, NIAID, National Institutes of Health, Rockville, Maryland 20852, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transforming growth factor beta-1
A, B, C, D
112Homo sapiensMutation(s): 0 
Gene Names: TGFB1 (TGFB)
Find proteins for P01137 (Homo sapiens)
Go to Gene View: TGFB1
Go to UniProtKB:  P01137
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
TGF-beta receptor type-2
E, F, G, H
116Homo sapiensMutation(s): 0 
Gene Names: TGFBR2
EC: 2.7.11.30
Find proteins for P37173 (Homo sapiens)
Go to Gene View: TGFBR2
Go to UniProtKB:  P37173
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
TGF-beta receptor type-1
I, J, K, L
85Homo sapiensMutation(s): 0 
Gene Names: TGFBR1 (ALK5, SKR4)
EC: 2.7.11.30
Find proteins for P36897 (Homo sapiens)
Go to Gene View: TGFBR1
Go to UniProtKB:  P36897
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.995 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.217 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 37.700α = 64.01
b = 99.350β = 84.47
c = 102.700γ = 84.34
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
EPMRphasing
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2009-10-27 
  • Released Date: 2010-03-02 
  • Deposition Author(s): Radaev, S., Sun, P.D.

Revision History 

  • Version 1.0: 2010-03-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance