Tyrosine

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 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.\nOther 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:\n* Isoelectric point: 5.64\n* Mass: 181.19\n* Abbreviations: Tyr / Y\n* Side chain: hydrophilic\n* Chemical formula: C₉O₃H₁₁N (structure) See also :\n* Alkaptonuria\n* Tyrosinemia Category:Amino acidsCategory:Phenols \n\n\n\n\n\n