Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso


  • Kensei Kobayashi
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_1624-5



Tyrosine is one of the 20 protein amino acids (Fig. 1). Its chemical structure is NH 2CH(CH 2C 6H 4OH)COOH. Its three-letter symbol is Tyr, and one-letter symbol is Y. Its molecular weight is 181.19, and its isoelectric point is 5.66. Tyrosine was found in cheese protein by von Liebig in 1846. Since its side chain has a phenol group (−C 6H 4OH), it is grouped as an aromatic amino acid together with phenylalanine and tryptophan. It has poorer solubility in water and organic solvents than most of other amino acids. Tyrosine has recently been detected in the extracts from Antarctic carbonaceous chondrites.


Molecular Weight Organic Solvent Bioorganic Chemistry Isoelectric Point Aromatic Amino Acid 
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© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Yokohama National UniversityYokohamaJapan