Title : Contribution of nucleoside diphosphokinase to guanine nucleotide regulation of agonist binding to formyl peptide receptors.

Pub. Date : 1991 Sep 12

PMID : 1657618






5 Functional Relationships(s)
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1 Under conditions in which the combination of GDP and ATP[S] induced 70-90% of maximal inhibition of [3H]FMLP binding, a total concentration of about 7 nM GTP[S] formed was measured. Guanosine Diphosphate formyl peptide receptor 1 Homo sapiens
2 The synergistic effect of GDP and ATP[S] on [3H]FMLP binding was not seen in the presence of UDP (1 mM), which blocked formation of GTP[S] from GDP and ATP[S]. Guanosine Diphosphate formyl peptide receptor 1 Homo sapiens
3 The synergistic effect of GDP and ATP[S] on [3H]FMLP binding was not seen in the presence of UDP (1 mM), which blocked formation of GTP[S] from GDP and ATP[S]. Guanosine Diphosphate formyl peptide receptor 1 Homo sapiens
4 Finally, regulation of [3H]FMLP binding by ATP[S] plus GDP (or GTP) was a time-dependent process, reaching maximal inhibition after 20-30 min of incubation at 25 degrees C. The data indicate that nucleoside diphosphokinase present in membranes of HL 60 cells can transfer the thiophosphate group of ATP[S] to GDP leading to formation of GTP[S] and that the GTP[S] thus formed efficiently binds to G proteins interacting with formyl peptide receptors and thereby regulates their agonist binding affinity. Guanosine Diphosphate formyl peptide receptor 1 Homo sapiens
5 Finally, regulation of [3H]FMLP binding by ATP[S] plus GDP (or GTP) was a time-dependent process, reaching maximal inhibition after 20-30 min of incubation at 25 degrees C. The data indicate that nucleoside diphosphokinase present in membranes of HL 60 cells can transfer the thiophosphate group of ATP[S] to GDP leading to formation of GTP[S] and that the GTP[S] thus formed efficiently binds to G proteins interacting with formyl peptide receptors and thereby regulates their agonist binding affinity. Guanosine Diphosphate formyl peptide receptor 1 Homo sapiens