tyrosine

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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 ?
Recently, phosphotyrosine antibody that is specific to the tyrosine phosphorylated proteins has been produced by other companies including Millipore Co.
Ramponi, Porcine Liver Low Mr Phosphotyrosine Protein Phosphatase: the Amino Acid Sequence, J.
Among these are an ion channel research programme and a phosphotyrosine protein phosphatase programme.
2+]] causes the detachment of phosphotyrosine phosphatase from PB3 and its inhibition promoting tyrosine phosphorylation of cdb3 [40].
PTPN22 encodes lymphoid tyrosine phosphatase (LYP), which dephosphorylates the phosphotyrosine residues of target proteins in lymphocytes.
The levels of SUMO-activating enzyme subunit 1 isoform a (SAE1), COP9 complex subunit 4 (COPS4) and CCT8 were lowered whereas the level of low molecular weight phosphotyrosine protein phosphatase isoform c (ACP1) was increased.
Calmodulin-stimulated de phosphorylation of p-nitrophenyl phosphate and free phosphotyrosine by calcineurin.
Epigenetic changes: Phosphorylation and methylation changes Treatment Assay(s) Model system Potassium dichromate Western blot for A549 human lung 300 [micro]M phosphotyrosine carcinoma cells 5-60 min expression Potassium dichromate In vitro BSA Bovine serum albumin Cr(V) species phosphorylation + radiolabeled ATP 100-500 [micro]M 2 min-18 h Potassium chromate Southern blot for Transgenic.
Likewise, bis(peroxido)vanadium species (Bpv) (Figure 1) (Table 1), a phosphotyrosine phosphatase inhibitor, induces myogenic cells to acquire a gene expression profile and differentiation potential consistent with the phenotype of circulating precursors, while maintaining their myogenic potential.
2007) Global survey of phosphotyrosine signaling identifies oncogenic kinases in lung cancer.
2B, the level of phosphotyrosine STAT3 (p-STAT3) was markedly increased with IL-6 treatment and angoline (1) treatment was found to significantly attenuate lL-6-induced STAT3 phosphorylation (p-STAT3) in a dose-dependent manner (Fig.