5UTK

Crystal structure of the membrane proximal three fibronectin type III (FNIII) domains of Tie2 (Tie2[FNIIIa-c])

  • Classification: TRANSFERASE
  • Organism(s): Homo sapiens
  • Expression System: Spodoptera frugiperda
  • Mutation(s): 

  • Deposited: 2017-02-15 Released: 2017-04-12 
  • Deposition Author(s): Moore, J.O., Lemmon, M.A., Ferguson, K.M.
  • Funding Organization(s): National Institutes of Health/National Cancer Institute; National Institutes of Health/National Institute of General Medical Sciences; American Cancer Society 

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.225 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Dimerization of Tie2 mediated by its membrane-proximal FNIII domains.

Moore, J.O.Lemmon, M.A.Ferguson, K.M.

(2017) Proc. Natl. Acad. Sci. U.S.A. 114: 4382-4387

  • DOI: 10.1073/pnas.1617800114

  • PubMed Abstract: 
  • Tie1 and Tie2, members of the tyrosine kinase family with immunoglobulin and EGF homology domains, are receptor tyrosine kinases found primarily in endothelial cells with key roles in development and maintenance of the vasculature and in angiogenesis ...

    Tie1 and Tie2, members of the tyrosine kinase family with immunoglobulin and EGF homology domains, are receptor tyrosine kinases found primarily in endothelial cells with key roles in development and maintenance of the vasculature and in angiogenesis. They are attractive targets for therapeutic intervention in tumor angiogenesis, inflammation, and sepsis. Tie2 is regulated directly by the multimeric angiopoietin (Ang) ligands, with Ang1 being its primary activator. Structural studies have shown how Angs bind to the Tie2 ligand-binding region, but do not explain Tie2 activation and suggest a passive role for the Tie2 extracellular region (ECR) in ligand-induced receptor dimerization. Here we show that the Tie2 ECR forms strong dimers even in the absence of bound ligand. Dimerization is mediated by membrane-proximal fibronectin type III (FNIII) domains that were omitted in previous structural studies. We describe a 2.5-Å resolution X-ray crystal structure of the membrane-proximal three Tie2 FNIII domains, Tie2(FNIIIa-c), revealing two possible dimerization modes that primarily involve the third FNIII domain, FNIIIc. Mutating these dimer interfaces implicates one of them (dimer 1) in soluble Tie2 (sTie2) dimerization in solution but suggests that both could play a role in Ang1-induced Tie2 activation, possibly modulated by Tie1. Through small-angle X-ray scattering studies of sTie2 dimers in solution and modeling based on crystal structures, we suggest that Ang1 binding may cross-link Tie2 dimers into higher-order oligomers, potentially explaining how Tie2 is differentially clustered following ligand engagement in different cellular contexts. Our results also firmly implicate FNIII domain-mediated interactions in Tie2 activation, identifying a potential Achilles' heel for therapeutic inhibition.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Angiopoietin-1 receptor
A, B
304Homo sapiensMutation(s): 2 
Gene Names: TEK (TIE2, VMCM, VMCM1)
EC: 2.7.10.1
Find proteins for Q02763 (Homo sapiens)
Go to Gene View: TEK
Go to UniProtKB:  Q02763
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.225 
  • Space Group: C 1 2 1
  • Diffraction Data DOI: 
    10.15785/SBGRID/451 SBGrid
Unit Cell:
Length (Å)Angle (°)
a = 174.950α = 90.00
b = 52.026β = 117.49
c = 111.427γ = 90.00
Software Package:
Software NamePurpose
HKL-3000data collection
SOLVEphasing
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
PHENIXrefinement
HKL-3000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer InstituteUnited StatesR03-CA187021
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01-GM099891
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01-GM107435
American Cancer SocietyUnited States123704-PF-13-034-01-DMC

Revision History 

  • Version 1.0: 2017-04-12
    Type: Initial release
  • Version 1.1: 2017-04-26
    Type: Database references
  • Version 1.2: 2017-05-03
    Type: Database references
  • Version 1.3: 2017-09-20
    Type: Author supporting evidence