Low-affinity interactions of BODIPY-FL-GTPgammaS and BODIPY-FL-GppNHp with G(i)- and G(s)-proteins.
AuthorsGille A, Seifert R
JournalNaunyn Schmiedebergs Arch Pharmacol
PubMed ID12920505
BODIPY-FL-guanosine 5'-[gamma-thio]triphosphate (B-GTPgammaS) and BODIPY-FL-guanosine 5'-[beta,gamma-imido]triphosphate (B-GppNHp) induce fluorescence changes upon binding to purified G(s)/G(i)-proteins and were suggested to serve as probes for monitoring receptor-mediated G-protein activation. However, B-GTPgammaS and B-GppNHp bound to receptor-Galpha(s)/Galpha(i) fusion proteins expressed in Sf9 cell membranes with 1100- to 5600-fold- and 17- to 55-fold lower ... More