Combining with an extracellular signal and transmitting the signal across the membrane by activating an associated G-protein; promotes the exchange of GDP for GTP on the alpha subunit of a heterotrimeric G-protein complex.
Wikipedia:GPCR
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reactome:R-HSA-114552 "G12/13 activation by PAR"
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reactome:R-HSA-114558 "Gq activation by PAR"
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reactome:R-HSA-167408 "The high affinity receptor complex binds to G-protein"