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Rating Newest Oldest. Best Answer: In biochemistry, a receptor is a protein molecule, embedded in either the plasma membrane or cytoplasm of a cell, to which a mobile signaling (or signal) molecule may attach.
The largest family of cell surface receptors are the G-protein coupled receptors (GPCRs). There are hundreds of different GPCR proteins, and they are the targets of many drugs. A diverse set of ligands bind to this type of receptor, including peptide hormones, neurotransmitters, and odor molecules.fter GTP hydrolysis, G-alpha bound to GDP can reassociate with a beta-gamma complex to form an inactive trimeric G-protein that can again associate with a receptor. The GTPase activity of the G-alpha is speeded up by other proteins--sometimes the target protein, sometimes a separate regulatory protein.