/me thuy"euh neen', -nin/, n. Biochem.
an amino acid, CH3SCH2CH2CH(NH2)COOH, found in casein, wool, and other proteins or prepared synthetically: used as a supplement to a special diet in the prevention and treatment of certain liver diseases. Abbr.: Met; Symbol: M
[1925-30; b. METHYL and THIONINE]

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Sulfur-containing essential amino acid, present in many common proteins, particularly egg albumin.

It is used in pharmaceuticals, in enriched foods, and as a nutritional supplement and feed additive.

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      sulfur-containing amino acid obtained by the hydrolysis of most common proteins. First isolated from casein (1922), methionine accounts for about 5 percent of the weight of egg albumin; other proteins contain much smaller amounts of methionine. It is one of several so-called essential amino acids for mammals and fowl; i.e., they cannot synthesize it. In microorganisms it is synthesized from the amino acids cysteine and aspartic acid.

      Methionine is important in methylation (the process by which methyl, or -CH3, groups are added to compounds) and is also a precursor of two other amino acids, cystine and cysteine.

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Universalium. 2010.

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  • méthionine — [ metjɔnin ] n. f. • 1949; angl. methionine (1928); cf. méthyle et thio ♦ Biochim. Acide aminé essentiel soufré, qui joue un rôle fondamental dans la traduction de l A. R. N. messager et dans les transferts biologiques de groupements méthyles. ●… …   Encyclopédie Universelle

  • methionine — methionine. См. метионин. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • methionine — [mə thī′ə nēn΄, mə thī′ənin] n. [ ME(THYL) + THION(IC) + INE3] an essential amino acid, CH3SCH2CH2CH(NH2)COOH, that contains sulfur, obtained from various proteins and used as a food supplement and in medicine …   English World dictionary

  • methionine — (= met; M; 149D) Contains the SCH3 group that can act as a methyl donor (see S adenosyl methionine). Common in proteins but at low frequency. The met x linkage is subject to specific cleavage by cyanogen bromide. See also formyl peptides …   Dictionary of molecular biology

  • methionine — 2 Amino 4 (methylthio)butyric acid; the l isomer is a nutritionally essential amino acid and the most important natural source of “active methyl” groups in the body, hence usually involved in methylations in vivo; the dl form is used as an… …   Medical dictionary

  • methionine C 11 — [USP] L methionine in which a portion of the molecules have been labeled with carbon 11, used as a tracer in positron emission tomography for the detection of malignant neoplasms; administered intravenously …   Medical dictionary

  • methionine — metioninas statusas T sritis chemija formulė CH₃SCH₂CH₂CH(NH₂)COOH santrumpa( os) Met, M atitikmenys: angl. methionine rus. метионин ryšiai: sinonimas – 2 amino 4 metiltiobutano rūgštis …   Chemijos terminų aiškinamasis žodynas

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