tyrosine

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Related to L-tyrosine: 5-htp

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.

ty·ro·sine (Tyr, Y),

(tī'rō-sēn, -sin),
2-Amino-3-(4-hydroxyphenyl)propionic acid; 3-(4-hydroxyphenyl)alanine; the l-isomer is an α-amino acid present in most proteins.

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

(tī′rə-sēn′)
n.
A nonessential amino acid, C9H11NO3, that is produced in the body from phenylalanine and is a precursor of melanin and of several neurotransmitters and hormones, such as epinephrine and thyroxine.

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.
enlarge picture
Chemical structure of tyrosine

ty·ro·sine

(Tyr, Y) (tī'rō-sēn)
An α-amino acid present in most proteins.

tyrosine

The AMINO ACID 4-hydroxyphenylalanine. This is one of the 20 amino acids that are incorporated into protein.
Tyrosineclick for a larger image
Fig. 308 Tyrosine . Molecular structure.

tyrosine (Y, Tyr)

one of the 20 AMINO ACIDS common in PROTEINS. It has a polar ‘R’ group structure and is soluble in water. See Fig. 308 . The ISOELECTRIC POINT of tyrosine is 5.7.

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 (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.
Enlarge picture
Chemical structure of tyrosine.

ty·ro·sine

(Tyr) (tī'rō-sēn)
An α-amino acid present in most proteins.

tyrosine (Tyr) (tī´rəsēn´),

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.
References in periodicals archive ?
L-Tyrosine and L-dopa quickly decompose to some other metabolites such as dopamine and dopachrome.
TYR is a copper containing monophenol monooxygenase that catalyzes the oxidation of the 3'-position of the L-tyrosine phenol-ring (Fig.
Participants were given tablets that contained Alfalfa, Bovine Adrenal, Bovine Liver, Bovine Pituitary, Bovine Thyroid, Burdock Root, Chromium GTF (food source), Guar Gum Seed, Kelp, L-Tyrosine (fermented bean source), Plant Polysaccharides, and Scullcap Herb.
Choose chard, spinach, or lambsquarter over kale or collards for your leafy greens; chard contains iodine, lambsquarter and spinach contain L-tyrosine.
Previously, the main production methods for L-Tyrosine invloved animal protein, such as hair or feathers.
Xcdo373 is linked with whole-seed L-tyrosine activity on chromosome 2AL, but not with L-DOPA activity (C.
Ouabain was first coupled with L-tyrosine with a method analogous to the one described above.
For low energy, depression and poor concentration, take 500-2,000mg of L-tyrosine three times per day (before breakfast, mid-morning and mid- afternoon).
CoQ10, L-Tyrosine, Antioxidant Formula, Siberian Ginseng, Gingko Biloba and St.
Contains an all-natural, proprietary energy blend of Palatinose, D-ribose, guarana, green tea, cha de burge, maca, yerba mate, panax ginseng and L-tyrosine