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: 3.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 

wwPDB Validation 3D Report Full Report


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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
  • Primary Citation of Related Structures:  
    3KFD

  • 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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Transforming growth factor beta-1ABCD112Homo sapiensMutation(s): 0 
Gene Names: TGFB1TGFB
Find proteins for P01137 (Homo sapiens)
Explore P01137 
Go to UniProtKB:  P01137
NIH Common Fund Data Resources
PHAROS  P01137
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
TGF-beta receptor type-1IJKL85Homo sapiensMutation(s): 0 
Gene Names: TGFBR1ALK5SKR4
EC: 2.7.11.30
Find proteins for P36897 (Homo sapiens)
Explore P36897 
Go to UniProtKB:  P36897
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PHAROS  P36897
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
TGF-beta receptor type-2EFGH116Homo sapiensMutation(s): 0 
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
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.7α = 64.01
b = 99.35β = 84.47
c = 102.7γ = 84.34
Software Package:
Software NamePurpose
PHASERphasing
EPMRphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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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
    Changes: Version format compliance