HETEROTRIMERIC G PROTEINS
\hˌɛtɹə͡ʊtɹɪmˈɛɹɪk d͡ʒˈiː pɹˈə͡ʊtiːnz], \hˌɛtɹəʊtɹɪmˈɛɹɪk dʒˈiː pɹˈəʊtiːnz], \h_ˌɛ_t_ɹ_əʊ_t_ɹ_ɪ_m_ˈɛ_ɹ_ɪ_k dʒ_ˈiː p_ɹ_ˈəʊ_t_iː_n_z]\
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GTP-BINDING PROTEINS that contain three non-identical subunits. They are found associated with members of the seven transmembrane domain superfamily of G-protein coupled receptors. The G-alpha subunit acts as a signal transduction molecule when it binds GTP and dissociates from the heterotrimer. Hydrolysis of GTP by the inherent GTPase activity of the protein causes it to revert to its inactive (heterotrimeric) form. EC 3.6.1.-.
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