ornithine

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or·ni·thine

O0124900 (ôr′nə-thēn′)n. An amino acid, C₅H₁₂N₂O₂, not found in proteins, formed by hydrolyzing arginine and important in the formation of urea.

[ornith(uric acid), an acid found in birds' urine (ornith(o)- + uric acid) + -ine.]

ornithine

(ˈɔːnɪˌθiːn) n (Biochemistry) an amino acid produced from arginine by hydrolysis: involved in the formation of urea in the liver; diaminopentanoic acid. Formula: NH2(CH2)3CHNH2COOH[C19: from ornithuric (acid) secreted in the urine of birds, from ornitho- + uric]

or•ni•thine

(ˈɔr nəˌθin)

n. an amino acid, H₂N(CH₂)₃CH(NH₂)COOH, obtained by the hydrolysis of arginine and occurring as an intermediate compound in the urea cycle of mammals. [1880–85; ornith(uric acid), secreted by birds + -ine²]

Thesaurus

Noun

ornithine - an amino acid that does not occur in proteins but is important in the formation of ureaamino acid, aminoalkanoic acid - organic compounds containing an amino group and a carboxylic acid group; "proteins are composed of various proportions of about 20 common amino acids"

Translations

Ornithine

ornithine

[′ȯr·nə‚thēn] (biochemistry) C₅H₁₂O₂N₂ An amino acid occurring in the urine of some birds, but not found in native proteins.

Ornithine

H₂N(CH₂)₃CH(NH₂)COOH (also α, δ-di-aminovaleric acid), an amino acid that is readily soluble in water and alcohol.

Ornithine has one asymmetric carbon atom and exists in two optically active forms (D- and L-) and one racemic form, L-ornithine, found in the tissues of animals and humans, plays an important role in the biosynthesis of urea by the ornithine cycle. It is formed from arginine and α-amino-y-formylbutyric acid and may be converted to proline. Free L-ornithine is found in plants; bound L-ornithine is a component of several peptide antibiotics (bacitracin and gramicidin). L-ornithine has not been isolated from natural proteins.

ornithine

[or´nĭ-thēn] an amino acid obtained from arginine by splitting of urea; it is an intermediate in urea biosynthesis.ornithine carbamoyltransferase (ornithine transcarbamylase) an enzyme that catalyzes a reaction occurring in the liver mitochondria as part of the cycle" >urea cycle.

or·ni·thine (Orn),

(ōr'ni-thēn, -thin), 2,5-Diaminovaleric acid; the l-isomer is the amino acid formed when l-arginine is hydrolyzed by arginase; not a constituent of proteins, but an important intermediate in the urea cycle; elevated levels seen in certain defects of the urea cycle.

ornithine

(ôr′nə-thēn′)n. An amino acid, C₅H₁₂N₂O₂, not found in proteins, formed by hydrolyzing arginine and important in the formation of urea.

or·ni·thine

(ōr'ni-thēn) The amino acid formed when l-arginine is hydrolyzed by arginase; an important intermediate in the urea cycle; elevated levels seen in certain defects of the urea cycle.

or·ni·thine

(Orn) (ōr'ni-thēn) Amino acid formed when l-arginine is hydrolyzed by arginase; important intermediate in the urea cycle.

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Words related to ornithine

noun an amino acid that does not occur in proteins but is important in the formation of urea

Related Words