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Downstream signaling effectors for umami taste.

Monosodium glutamate (MSG) elicits a unique taste called umami.A characteristic feature of umami taste is its potentiation by 5′-ribonucleotides (primarily GMP and IMP), which also have anumami taste of their own. Based on recent molecular studies, twoputative umami receptors have been identified: a truncated variantof the metabotropic glutamate receptor mGluR4 (taste-mGluR4)(Chaudhari