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Tyrosine (from the Greek tyros, for "cheese", where it was first discovered), 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.

It plays a key role in signal transduction, since it can be tagged ( phosphorylated) with a phosphate group by protein kinases to alter the functionality and activity of certain enzymes. Other important biological functions of tyrosine are as a precursor of the thyroid hormone, thyroxine and of the biologically active catecholamines, dopamine, noradrenaline and adrenaline.

Chemical properties:

• Isoelectric pointThe isoelectric point (pI) is the pH at which a molecule carries no net electrical charge. For an amino acid with only one amine and one carboxyl group, the pI can be calculated from the pKa's of this molecule. For amino acids with more than two ionizable: 5.64
• Mass: 181.19
• Abbreviations: Tyr / Y
• Side chain: hydrophilic
• Chemical formula: CAlternative meaning: Carbon (computing Carbon is a chemical element in the periodic table that has the symbol C and atomic number 6. An abundant nonmetallic, tetravalent element, carbon has several allotropic forms: diamonds (hardest known mineral). Bindi₉ OOxygen is the chemical element in the periodic table that has the symbol O and atomic number 8. The element is very common, found not only on Earth but throughout the universe. Molecular oxygen (O, often called free oxygen on Earth is thermodynamically un₃ Hhydrogen helium H Li Full table General Name, Symbol, NumberHydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1 (IA), 1 , s Density, Hardness 0. 0899 kg/m3, NA Appearance colorless Atomic properties Atomic weight 1. 00794 amu Atomic radius (ca₁₁ NNitrogen is the chemical element in the periodic table that has the symbol N and atomic number 7. A common normally colorless, odorless, tasteless and mostly inert diatomic non-metal gas, nitrogen constitutes 78 percent of Earth's atmosphere and is a cons ( structure)

See also :

• AlkaptonuriaAlkaptonuria also known as alcaptonuria or ochronosis is a rare inherited, genetic disorder of tyrosine metabolism. This is an autosomal recessive trait that is caused by defect in the enzyme homogentisic acid oxidase. The characteristic of alkaptonuria i
• Tyrosinemia