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G(i/o)-coupled presynaptic GPCRs are major targets in neuropsychiatric diseases. For example, presynaptic auto- or heteroreceptors include the D(2) dopamine receptor, H(3) histamine receptor, 5HT(1) serotonin receptors, M(4) acetylcholine receptors, GABA(B) receptors, Class II and III metabotropic glutamate receptors, opioid receptors, as well as many other receptors. These GPCRs exert their influence by decreasing exocytosis of synaptic vesicles. One mechanism by which they act is through direct interaction of the Gβγ subunit with members of the SNARE complex downstream of voltage-dependent calcium channels, and specifically with the C-terminus of SNAP25 and the H3 domain of syntaxin1A(1-3). Small molecule inhibitors of the Gβγ-SNARE interaction would allow the study of the relative importance of this mechanism in more detail. We have utilized novel, label-free technology to detect this protein-protein interaction and screen for several small molecule compounds that perturb the interaction, demonstrating the viability of this approach. Interestingly, the screen also produced enhancers of the Gβγ-SNARE interaction.

Label-Free Detection of G Protein–SNARE Interactions and Screening for Small Molecule Modulators