Leucine
Leucine Leu"cine (l[=oo]"s[=e]n), Leucin Leu"cin(l[=u]"s[i^]n), n. [Gr. leyko`s white.] (Physiol. Chem.) a naturally occurring alpha-amino acid ({(CH3)2CH.CH2.CH(NH2)-COOH}), one of the building units of almost all proteins of living organisms, both animal and vegetable. It is one of the essential amino acids (not synthesized by the human body, a required component for proper nutrition), and is hydrophobic in character when bound in proteins. In isolated form it is a white, crystalline, zwitterionic substance formed, e. g. by the decomposition of proteins by pancreatic digestion, by the action of boiling dilute mineral acid, or by putrefaction. Chemically it is to be considered as amido-caproic acid. It occurs as two optical isomers, the L- and D-forms. The L-form, L-leucine, is the natural form, present in most proteins. [1913 Webster +PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Leucine — L ou S(+) leucine D ou R( ) leucine Général …   Wikipédia en Français

  • leucine — [ løsin ] n. f. • 1832; de leuc(o) et ine ♦ Biochim. Acide aminé essentiel, l un des vingt constituants des protéines. ⇒ isoleucine. ● leucine nom féminin Aminoacide dont l antipode lévogyre, la L leucine, est un constituant essentiel des… …   Encyclopédie Universelle

  • leucine — [lo͞o′sēn΄, lo͞o′sin] n. [< Gr leukos, white (see LIGHT1) + INE3] an essential amino acid, (CH3) 2CHCH2CH(NH2)COOH, produced by the hydrolysis of proteins by pancreatic enzymes during digestion and by the putrefaction of nitrogenous organic… …   English World dictionary

  • Leucine — NatOrganicBox name= ( S ) 2 amino 4 methyl pentanoic acid PubChem=6106 CAS=61 90 5 SMILES=CC(C)C [C@H] (N)C(O)=O C=6 |H=13 |N=1 |O=2 mass=131.18 g/molLeucine (abbreviated as Leu or L) [cite web | author=IUPAC IUBMB Joint Commission on Biochemical …   Wikipedia

  • Leucine — Als Leucine fasst man zunächst die vier isomeren Aminosäuren Leucin, Isoleucin, tert Leucin und Norleucin zusammen. Im Vergleich mit den vier Butanolen kann man sie als butylsubstituierte Glycine auffassen; damit sind alle vier Varianten… …   Deutsch Wikipedia

  • leucine — 2 Amino 4 methylvaleric acid; the l isomer is one of the amino acid s found in proteins; a nutritionally essential amino acid. l. aminopeptidase aminopeptidase (cytosol). l. dehydrogenase an enzyme that catalyzes the reaction of l l., water, and… …   Medical dictionary

  • leucine — leucinas statusas T sritis chemija formulė (CH₃)₂CHCH₂CH(NH₂)COOH santrumpa( os) Leu, L atitikmenys: angl. leucine rus. лейцин ryšiai: sinonimas – 2 amino 4 metilpentano rūgštis …   Chemijos terminų aiškinamasis žodynas

  • leucine — noun Etymology: French, from leuc leuk Date: 1826 a white crystalline essential amino acid C6H13NO2 obtained by the hydrolysis of most dietary proteins …   New Collegiate Dictionary

  • leucine — n. [Gr. leukos, white] An amino acid, x amino isocaproic acid found in tissues of various invertebrates …   Dictionary of invertebrate zoology

  • leucine — (= leu; L; 2 amino 4 methylpentanoic acid; 131 D) The most abundant amino acid found in proteins. Confers hydrophobicity and has a structural rather than a chemical role …   Dictionary of molecular biology

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