Pheromone alpha factor receptor

UniProtKB accession:  D6VTK4

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UniProtKB description:  Fungal class D1 G-protein-coupled receptor that acts as an alpha-factor pheromone receptor performing pheromone-dependent signal transduction involved in cellular conjugation, mating projection assembly, and in cell fusion (PubMed:4595644, PubMed:6993497, PubMed:6353246, PubMed:6360378, PubMed:3023832, PubMed:3037311, PubMed:2842059, PubMed:2839507, PubMed:2556384, PubMed:9286665, PubMed:9824658, PubMed:9529386, PubMed:9742115, PubMed:9819407, PubMed:10744981, PubMed:11495900, PubMed:12427030). Following alpha-factor-binding, the signal is transmitted via a tripartite G protein consisting of alpha-, beta- and gamma-subunits (GAP1, STE4 and STE8 respectively) that prepares the cell for conjugation (PubMed:1647971, PubMed:1330324, PubMed:8385135, PubMed:8132618, PubMed:8692892, PubMed:10866688, PubMed:11287148). In the inactive state, the cytoplasmic end of transmembrane domain 7 (TMD7) is unstructured and packs between TMD1-6, blocking the G protein coupling site (PubMed:35296853). Agonist binding results in the outward movement of the extracellular ends of TMD6 and TMD7 by 6 Angstroms (PubMed:35296853). On the intracellular surface, the G protein coupling site is formed by a 20 Angstroms outward movement of the unstructured region in TMD7 that unblocks the site, and a 12 Angstroms inward movement of TMD6 (PubMed:35296853).