Crystal structure of Tie1 Fibronectin-like domain 3

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.315 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.249 

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Structural basis of Tie2 activation and Tie2/Tie1 heterodimerization.

Leppanen, V.M.Saharinen, P.Alitalo, K.

(2017) Proc Natl Acad Sci U S A 114: 4376-4381

  • DOI: https://doi.org/10.1073/pnas.1616166114
  • Primary Citation of Related Structures:  
    5MYA, 5MYB, 5N06

  • PubMed Abstract: 

    The endothelial cell (EC)-specific receptor tyrosine kinases Tie1 and Tie2 are necessary for the remodeling and maturation of blood and lymphatic vessels. Angiopoietin-1 (Ang1) growth factor is a Tie2 agonist, whereas Ang2 functions as a context-dependent agonist/antagonist. The orphan receptor Tie1 modulates Tie2 activation, which is induced by association of angiopoietins with Tie2 in cis and across EC-EC junctions in trans Except for the binding of the C-terminal angiopoietin domains to the Tie2 ligand-binding domain, the mechanisms for Tie2 activation are poorly understood. We report here the structural basis of Ang1-induced Tie2 dimerization in cis and provide mechanistic insights on Ang2 antagonism, Tie1/Tie2 heterodimerization, and Tie2 clustering. We find that Ang1-induced Tie2 dimerization and activation occurs via the formation of an intermolecular β-sheet between the membrane-proximal (third) Fibronectin type III domains (Fn3) of Tie2. The structures of Tie2 and Tie1 Fn3 domains are similar and compatible with Tie2/Tie1 heterodimerization by the same mechanism. Mutagenesis of the key interaction residues of Tie2 and Tie1 Fn3 domains decreased Ang1-induced Tie2 phosphorylation and increased the basal phosphorylation of Tie1, respectively. Furthermore, the Tie2 structures revealed additional interactions between the Fn 2 (Fn2) domains that coincide with a mutation of Tie2 in primary congenital glaucoma that leads to defective Tie2 clustering and junctional localization. Mutagenesis of the Fn2-Fn2 interface increased the basal phosphorylation of Tie2, suggesting that the Fn2 interactions are essential in preformed Tie2 oligomerization. The interactions of the membrane-proximal domains could provide new targets for modulation of Tie receptor activity.

  • Organizational Affiliation

    Wihuri Research Institute, Biomedicum Helsinki, Haartmaninkatu 8, 00290 Helsinki, Finland; kari.alitalo@helsinki.fi veli-matti.leppanen@helsinki.fi.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tyrosine-protein kinase receptor Tie-1
A, B
126Homo sapiensMutation(s): 0 
Gene Names: TIE1TIE
UniProt & NIH Common Fund Data Resources
Find proteins for P35590 (Homo sapiens)
Explore P35590 
Go to UniProtKB:  P35590
PHAROS:  P35590
GTEx:  ENSG00000066056 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35590
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.315 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.249 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.054α = 90
b = 54.054β = 90
c = 107.27γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-04-26
    Type: Initial release
  • Version 1.1: 2017-05-03
    Changes: Database references