PMID: 8609887Apr 1, 1996Paper

Suramin analogues as subtype-selective G protein inhibitors

Molecular Pharmacology
M FreissmuthC Nanoff

Abstract

G protein alpha subunits expose specific binding sites that allow for the sequential, conformation-dependent binding of protein reaction partners, e.g., G protein beta gamma dimers, receptors, and effectors. These domains represent potential sites for binding of low-molecular-weight inhibitors. We tested the following suramin analogues as G protein antagonists: 8-(3-nitrobenzamido)-1,3,5-naphtalenetrisulfonic acid (NF007), 8-(3-(3-nitrobenzamido)benzamido)-1,3,5-naphtalenetrisulfonic++ + acid NF018), 8,8'-(carbonylbis(imino-3,1-phenylene))bis-(1,3,5-naphtalenetri sulfonic acid) (NF023), 8,8'-(carbonylbis(imino-3,1-phenylene)carbonylimino-(3,1-phe nylene))bis-(1,3, 5-naphtalenetrisulfonic acid) (NF037), and suramin. The compounds suppressed [35S]GTPgammaS binding to purified, recombinant G protein alpha subunits, an effect that is due to inhibition of GDP release. Suramin is selective for recombinant Gsalpha-s (EC50 values o f approximately 240 nM; rank order of potency, suramin > NF037 > NF023 > NF018 > NF007), whereas NF023 is selective for recombinant Gi alpha-1 and recombinant Go alpha (EC50 value of approximately 300 nM; rank order of potency, NF023 > / = NF037 > suramin >0 NF018 > NF007). Selectivity was also demonstrated ...Continue Reading

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