[Alpha-1A-adrenergic receptor, encoded by the ADRA1A gene, regulates smooth muscle contraction, cellular growth and apoptosis. Alpha-1-adrenergic receptors (alpha-1-ARs) are members of the G protein-coupled receptor superfamily. There are 3 alpha-1-AR subtypes: alpha-1A, -1B and -1D, all of which signal through the Gq/11 family of G-proteins and different subtypes show different patterns of activation. This alpha-adrenergic receptor mediates its action by association with g proteins that activate a phosphatidylinositol-calcium second messenger system. Its effect is mediated by G(Q) and G(11) proteins. Alternative splicing of the ADRA1A gene generates 4 transcript variants, which encode 4 different isoforms with distinct C termini but having similar ligand binding properties. Its carboxyl-terminal SER or THR residues may be phosphorylated. (From LocusLink, Swiss_Prot and NCI) ( NCI )]
UMLS (NCI) C0389726 - Amino Acid, Peptide, or Protein
- Receptor
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