tyrosine /ty·ro·sine/ (Tyr) (Y) (ti´ro-sēn) a naturally occurring, nonessential amino acid present in most proteins; it is a product of phenylalanine metabolism and a precursor of thyroid hormones, catecholamines, and melanin.
Tyrosine
tyrosine (Tyr) 
tyrosine [ti´ro-sēn]
tyrosine (tīˑ·r
·sēn),
tyrosine (Tyr) (tī´r
sēn´),
ty·ro·sine (t  r -s n )n. Abbr. Tyr A white crystalline amino acid that is derived from the hydrolysis of proteins such as casein and is a precursor of epinephrine, thyroxine, and melanin. |
Tyrosine
A protein building block found in a wide variety of foods that is used by the body to make melanin.
Mentioned in: Albinism
tyrosine (Tyr)
[tī′rəsēn]
Etymology: Gk, tyros
an amino acid synthesized in the body from the essential amino acid phenylalanine. Tyrosine is found in most proteins and is a precursor of melanin and several hormones, including epINEPHrine and thyroxine. See also amino acid, hormone, melanocyte.
)
Chemical structure of tyrosine
tyrosine [ti´ro-sēn]
a naturally occurring, nonessential amino acid present in most proteins and synthesized metabolically from phenylalanine. It is a precursor of melanin, catecholamines, and thyroid hormones.
tyrosine (tīˑ·r
·sēn),n an amino acid involved in the synthesis of neurotransmitters; has other functions. Has been used to treat sleep disorders, enhance cognitive function, and alleviate symptoms of ADD. No known precautions. Also called
L-tyrosine.
L-tyrosine.
)
Chemical structure of tyrosine.
tyrosine (Tyr) (tī´r
sēn´),n an amino acid synthesized in the body from the essential amino acid phenylalanine. Tyrosine is found in most proteins and is a precursor of melanin and several hormones, including epinephrine and thyroxine.
tyrosine, tyrosin
Tyr; a naturally occurring amino acid present in most proteins; it is a product of phenylalanine metabolism and a precursor of melanin, catecholamines and thyroid hormones.
tyrosine hydroxylase
an oxidase which converts tyrosine to dopa.
tyrosine tolerance test
used as a test of liver function but about 85% of liver parenchyma must be lost before the test gives a positive reaction.
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