Abstract:
:The stimulatory GTP-binding protein of adenylate cyclase, Gs, and beta-adrenergic receptors were reconstituted into unilamellar phospholipid vesicles. The kinetics of the quasiirreversible binding of guanosine 5'-O-(3-thiotriphosphate) (GTP gamma S) to Gs, equivalent to Gs activation by nucleotide, was studied with respect to the stimulation of this process by beta-adrenergic agonists and Mg2+. The rate of GTP gamma S binding displayed apparent first-order kinetics over a wide range of nucleotide, agonist, and Mg2+ concentrations. In the absence of agonist, the apparent first-order rate constant, kapp, was 0.17-0.34 min-1 and did not vary significantly with the concentration of nucleotide. At 50 mM MgCl2, kapp increased somewhat, to 0.26-0.41 min-1, and remained invariant with the nucleotide concentration. In the presence of agonist, kapp was dependent on nucleotide concentration. At 10(-9) M GTP gamma S, the addition of (-)-isoproterenol caused at most a 2-fold stimulation of kapp. However, kapp measured in the presence of isoproterenol increased as an apparently saturable function of the GTP gamma S concentration, such that isoproterenol caused a 17-fold increase in kapp at 1 microM GTP gamma S. The effect of isoproterenol on kapp also appeared to saturate at high isoproterenol concentration, yielding a kapp approximately 6 min-1 at high concentrations of both nucleotide and agonist. These data suggest that the receptor-agonist complex acts by increasing the rate of conversion of a lower affinity Gs-GTP gamma S complex to the stable activated state.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Asano T,Ross EMdoi
10.1021/bi00318a014subject
Has Abstractpub_date
1984-11-06 00:00:00pages
5467-71issue
23eissn
0006-2960issn
1520-4995journal_volume
23pub_type
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