Functional analysis of a human A(1) adenosine receptor/green fluorescent protein/G(i1)alpha fusion protein following stable expression in CHO cells

FEBS Lett. 1999 Nov 26;462(1-2):61-5. doi: 10.1016/s0014-5793(99)01467-2.


Fusion proteins between the human A(1) adenosine receptor and the pertussis toxin resistant (Cys351Gly) mutant of the G-protein alpha subunit G(i1)alpha (A1/Gi), and between the human A(1) adenosine receptor, the Aequorea victoria green fluorescent protein (GFP) and Cys351Gly G(i1)alpha (A1/GFP/Gi), were expressed in CHO cells. The agonist NECA caused a stimulation of [(35)S]GTPgammaS binding at both fusion proteins with similar concentration dependence as at the native receptor. However in the presence of pertussis toxin NECA stimulation of [(35)S]GTPgammaS binding was only seen at the A1/GFP/Gi fusion protein. The regulation of the adenylyl cyclase and MAP kinase effector systems by both fusion proteins was attenuated following pertussis toxin treatment. These studies demonstrate for the first time the characterisation of a fusion protein between a G-protein coupled receptor, GFP and a G-protein alpha subunit.

MeSH terms

  • Animals
  • CHO Cells
  • Cricetinae
  • GTP-Binding Protein alpha Subunits, Gi-Go / biosynthesis
  • GTP-Binding Protein alpha Subunits, Gi-Go / genetics
  • GTP-Binding Protein alpha Subunits, Gi-Go / physiology*
  • Green Fluorescent Proteins
  • Humans
  • Luminescent Proteins / biosynthesis
  • Luminescent Proteins / genetics
  • Receptors, Purinergic P1 / biosynthesis
  • Receptors, Purinergic P1 / genetics
  • Receptors, Purinergic P1 / physiology*
  • Recombinant Fusion Proteins / biosynthesis


  • Luminescent Proteins
  • Receptors, Purinergic P1
  • Recombinant Fusion Proteins
  • Green Fluorescent Proteins
  • GTP-Binding Protein alpha Subunits, Gi-Go