Leucine

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.

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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-2-alanine enkephalin — is a synthetic delta selective opioid peptide with analgesic properties. Treatment with dadle results in transient depression of mean arterial blood pressure and heart rate [http://cancerweb.ncl.ac.uk/cgi bin/omd?enkephalin,+leucine 2 alanine]… …   Wikipedia

  • Leucine-responsive protein — Leucine responsive protein, or Lrp, is a global regulator protein, meaning that it regulates the biosynthesis of leucine, as well as the other branched chain amino acids, valine and isoleucine. In bacteria, it is encoded by the lrp gene.Lrp… …   Wikipedia

  • leucine aminopeptidase — n an aminopeptidase that cleaves terminal amino acid residues and esp. leucine from protein chains, is found in all bodily tissues, and is increased in the serum in some conditions or diseases (as pancreatic carcinoma) * * * (LAP) leu·cine… …   Medical dictionary

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