Definition of methionine in English:

methionine

Line breaks: me¦thio|nine
Pronunciation: /mɪˈθʌɪəniːn
 
/

noun

[mass noun] Biochemistry
  • A sulphur-containing amino acid which is a constituent of most proteins and is essential to the diet of vertebrates.
    • Chemical formula: CH3S(CH2)2CH(NH2)COOH
    More example sentences
    • They fix nitrogen and so contain high quality protein, including the essential amino acids methionine and cystine.
    • The oxidation sites of alpha-crystallin are considered to be methionine, cysteine and tryptophan amino acid residues.
    • For example, eggs are high in alanine and methionine; whey protein is high in tryptophan and threonine.

Origin

1920s: from methyl + Greek theion 'sulphur'.

More definitions of methionine

Definition of methionine in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day grotesquerie
Pronunciation: grəʊˈtɛskəri
noun
grotesque quality or grotesque things collectively