The product of this gene belongs to the ligand-gated ion channel receptor superfamily. This gene encodes subunit A of the type 3 receptor for 5-hydroxytryptamine (serotonin), a biogenic hormone that functions as a neurotransmitter, a hormone, and a mitogen. This receptor causes fast, depolarizing responses in neurons after activation. It appears that the heteromeric combination of A and B subunits is necessary to provide the full functional features of this receptor, since either subunit alone results in receptors with very low conductance and response amplitude. Alternatively spliced transcript variants encoding different isoforms have been identified.
Ion channel transport, organism-specific biosystem; Ligand-gated ion channel transport, organism-specific biosystem; Serotonergic synapse, organism-specific biosystem; Transmembrane transport of small molecules, organism-specific biosystem;
extracellular ligand-gated ion channel activity; extracellular ligand-gated ion channel activity; ion channel activity; receptor activity; serotonin binding; serotonin receptor activity; serotonin receptor activity; serotonin-activated cation-selective channel activity;