Umami , a savory taste, is one of the five basic tastes, (together with sweet, sour, bitter and salty).

Coding of Sweet, Bitter, and Umami Tastes
Human receptors for sweet and umami taste.
Umami taste responses are mediated by alpha-transducin and alpha-gustducin.
Molecular mechanism for the umami taste synergism
The Receptors for Mammalian Sweet and Umami Taste
Umami: a delicious flavor formed by convergence of taste and olfactory pathways in the human brain.
Trpm5 null mice respond to bitter, sweet, and umami compounds
Coding of sweet, bitter, and umami tastes: different receptor cells sharing similar signaling pathways.
Contrasting modes of evolution between vertebrate sweet/umami receptor genes and bitter receptor genes.
CALHM1 ion channel mediates purinergic neurotransmission of sweet, bitter and umami tastes