4F8K

Molecular analysis of the interaction between the prostacyclin receptor and the first PDZ domain of PDZK1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Molecular Analysis of the Prostacyclin Receptor's Interaction with the PDZ1 Domain of Its Adaptor Protein PDZK1.

Birrane, G.Mulvaney, E.P.Pal, R.Kinsella, B.T.Kocher, O.

(2013) Plos One 8: e53819-e53819

  • DOI: 10.1371/journal.pone.0053819

  • PubMed Abstract: 
  • The prostanoid prostacyclin, or prostaglandin I2, plays an essential role in many aspects of cardiovascular disease. The actions of prostacyclin are mainly mediated through its activation of the prostacyclin receptor or, in short, the IP. In recent s ...

    The prostanoid prostacyclin, or prostaglandin I2, plays an essential role in many aspects of cardiovascular disease. The actions of prostacyclin are mainly mediated through its activation of the prostacyclin receptor or, in short, the IP. In recent studies, the cytoplasmic carboxy-terminal domain of the IP was shown to bind several PDZ domains of the multi-PDZ adaptor PDZK1. The interaction between the two proteins was found to enhance cell surface expression of the IP and to be functionally important in promoting prostacyclin-induced endothelial cell migration and angiogenesis. To investigate the interaction of the IP with the first PDZ domain (PDZ1) of PDZK1, we generated a nine residue peptide (KK(411)IAACSLC(417)) containing the seven carboxy-terminal amino acids of the IP and measured its binding affinity to a recombinant protein corresponding to PDZ1 by isothermal titration calorimetry. We determined that the IP interacts with PDZ1 with a binding affinity of 8.2 ┬ÁM. Using the same technique, we also determined that the farnesylated form of carboxy-terminus of the IP does not bind to PDZ1. To understand the molecular basis of these findings, we solved the high resolution crystal structure of PDZ1 bound to a 7-residue peptide derived from the carboxy-terminus of the non-farnesylated form of IP ((411)IAACSLC(417)). Analysis of the structure demonstrates a critical role for the three carboxy-terminal amino acids in establishing a strong interaction with PDZ1 and explains the inability of the farnesylated form of IP to interact with the PDZ1 domain of PDZK1 at least in vitro.


    Organizational Affiliation

    Division of Experimental Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Na(+)/H(+) exchange regulatory cofactor NHE-RF3, Prostacyclin receptor
A, B
109Mus musculusGene Names: Ptgir, Pdzk1 (Cap70, Nherf3)
Find proteins for P43252 (Mus musculus)
Go to UniProtKB:  P43252
Find proteins for Q9JIL4 (Mus musculus)
Go to UniProtKB:  Q9JIL4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.184 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 39.271α = 90.00
b = 68.477β = 91.75
c = 40.124γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
HKL-2000data reduction
CBASSdata collection
REFMACrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-02-27
    Type: Initial release
  • Version 1.1: 2013-03-27
    Type: Database references
  • Version 1.2: 2017-08-09
    Type: Refinement description, Source and taxonomy