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Ornithine is an amino acid that, under the action of the enzyme arginase on L-arginine, yields urea. Therefore, ornithine is a central part of the urea cycle, which eliminates excess nitrogen. Ornithine is not an amino acid coded by DNA, and in that sense, it is not involved in protein synthesis. In mammalian non-hepatic tissues, however, the urea cycle is mainly involved in arginine biosynthesis, making ornithine an important metabolic process. It is not directly a product of the the genetic code because polypeptides containing unprotected ornithines undergo spontaneous lactamization. This proved to be a problem when ornithine was originally classified among the other 20 naturally occuring amino acids. Copyright Text is available under the Creative Commons Attribution/Share-Alike License. See for details. Source: Wikipedia, Ornithine (Wikipedia)

An amino acid produced in the urea cycle when the enzyme arginase cleaves off urea from arginine. Source: National Library of Medicine, MeSH 2006

Ornithine is an amino acid generated when the enzyme arginase cleaves off urea from L-arginine. Ornithine eliminates excess nitrogen as part of the urea cycle. (Information from Wikipedia 9/14/06)
Increased in cystinuria, gyrate atrophy, hyperornithinemia, hyperammonemia, homocitrullinuria syndrome, ornithine carbamoyl transferase deficiency, and dibasic aminoaciduria Type I and II (Information from LOINC partner 1 9/15/06). Source: Regenstrief Institute

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Tag Language Translation
zh-CN Chinese (China) 鸟氨酸
Synonyms: 2,5-二氨基戊酸;Orn
fr-CA French (Canada) Ornithine
et-EE Estonian (Estonia) Ornitiin
es-ES Spanish (Spain) Ornitina
it-IT Italian (Italy) Ornitina
tr-TR Turkish (Turkey) Ornitin
ru-RU Russian (Russian Federation) Орнитин
nl-NL Dutch (Netherlands) ornithine
fr-BE French (Belgium) Ornithine