The binding of acetylcholine to the Muscarinic Acetylcholine Receptor M3 activates the heterotrimeric G protein, Gq, associated with the M3 receptor. Activation occurs through protein-protein interaction and results in the alpha subunit of Gq exchanging GDP for GTP (i.e releasing GDP and binding GTP). The 3 subunits of the G protein then dissociate into an alpha:GTP complex and a beta:gamma complex.
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