Researchers hone in on the elusive receptor for sour taste

Sour is the taste of summer, a taste that evokes lemonade stands and vine-ripe tomatoes. Among the five basic tastes—the others being bitter, sweet, salty and umami—it is arguably the most subtle. In small amounts, it ...

Receptor (biochemistry)

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. A molecule which binds to a receptor is called a "ligand," and may be a peptide (such as a neurotransmitter), a hormone, a pharmaceutical drug, or a toxin, and when such binding occurs, the receptor undergoes a conformational change which ordinarily initiates a cellular response. However, some ligands merely block receptors without inducing any response (e.g. antagonists). Ligand-induced changes in receptors result in physiological changes which constitute the biological activity of the ligands.

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