4JZC

Angiopoietin-2 fibrinogen domain TAG mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for angiopoietin-1-mediated signaling initiation.

Yu, X.Seegar, T.C.Dalton, A.C.Tzvetkova-Robev, D.Goldgur, Y.Rajashankar, K.R.Nikolov, D.B.Barton, W.A.

(2013) Proc.Natl.Acad.Sci.USA 110: 7205-7210

  • DOI: 10.1073/pnas.1216890110
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Angiogenesis is a complex cellular process involving multiple regulatory growth factors and growth factor receptors. Among them, the ligands for the endothelial-specific tunica intima endothelial receptor tyrosine kinase 2 (Tie2) receptor kinase, ang ...

    Angiogenesis is a complex cellular process involving multiple regulatory growth factors and growth factor receptors. Among them, the ligands for the endothelial-specific tunica intima endothelial receptor tyrosine kinase 2 (Tie2) receptor kinase, angiopoietin-1 (Ang1) and Ang2, play essential roles in balancing vessel stability and regression during both developmental and tumor-induced angiogenesis. Despite possessing a high degree of sequence identity, Ang1 and Ang2 have distinct functional roles and cell-signaling characteristics. Here, we present the crystal structures of Ang1 both unbound and in complex with the Tie2 ectodomain. Comparison of the Ang1-containing structures with their Ang2-containing counterparts provide insight into the mechanism of receptor activation and reveal molecular surfaces important for interactions with Tie2 coreceptors and associated signaling proteins. Using structure-based mutagenesis, we identify a loop within the angiopoietin P domain, adjacent to the receptor-binding interface, which confers the specific agonist/antagonist properties of the molecule. We demonstrate using cell-based assays that an Ang2 chimera containing the Ang1 loop sequence behaves functionally similarly to Ang1 as a constitutive Tie2 agonist, able to efficiently dissociate the inhibitory Tie1/Tie2 complex and elicit Tie2 clustering and downstream signaling.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Angiopoietin-2
A
218Homo sapiensMutation(s): 3 
Gene Names: ANGPT2
Find proteins for O15123 (Homo sapiens)
Go to Gene View: ANGPT2
Go to UniProtKB:  O15123
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.230 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 46.692α = 90.00
b = 79.055β = 90.00
c = 135.544γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-05-08
    Type: Initial release
  • Version 1.1: 2013-05-15
    Type: Database references