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Tyrosine (from the Greek tyros, meaning cheese, as it was first discovered in cheese[ citationneeded ]), 4-hydroxyphenylalanine, or 2-amino-3(4-hydroxyphenyl)-propanoic acid, is one of the 20 amino acids that are used by cells to synthesize proteins. It has a phenol side chain with a hydroxyl group. Upon the location of the hydroxyl group, there are three structural isomers of Tyr, namely para-Tyr (p-Tyr), meta-Tyr (m-Tyr) and ortho-Tyr (o-Tyr). Enzymatically, only the first isomer (p-Tyr) is produced from L-Phe by the Phe-hydroxylase enzyme. The other two isoforms, m-Tyr and o-Tyr can be produced as a consequence of free radical attack on Phe in states with increased oxidative stress. Copyright Text is available under the Creative Commons Attribution/Share-Alike License. See for details. Source: Wikipedia, Tyrosine (Wikipedia)

A non-essential amino acid. In animals it is synthesized from PHENYLALANINE. It is also the precursor of EPINEPHRINE; THYROID HORMONES; and melanin. Source: National Library of Medicine, MeSH 2006

Tyrosine is a primary marker for Tyrosinemia type II and Tyrosinemia type III. Secondary marker for Tyrosinemia type I. Source: Regenstrief LOINC

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Language Variants Get Info

Tag Language Translation
zh-CN Chinese (China) 酪氨酸
Synonyms: Tyr
fr-CA French (Canada) Tyrosine
et-EE Estonian (Estonia) türosiin
es-ES Spanish (Spain) Tirosina
it-IT Italian (Italy) Tirosina
tr-TR Turkish (Turkey) Tirozin
ru-RU Russian (Russian Federation) Тирозин
nl-NL Dutch (Netherlands) tyrosine
fr-BE French (Belgium) Tyrosine
pl-PL Polish (Poland) tyrozyna