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n. (context amino acid organic compound English) A lipotropic, sulphur-containing essential amino acid, C5H11NO2S, found in most protein.


n. a crystalline amino acid containing sulfur; found in most proteins and essential for nutrition


Methionine (abbreviated as Met or M; encoded by the codon AUG) is an α- amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated −NH form under biological conditions), an α- carboxylic acid group (which is in the deprotonated −COO form under biological conditions), and an S-methyl thioether side chain, classifying it as a non-polar, aliphatic amino acid. It is essential in humans, meaning the body cannot synthesize it and thus it must be obtained from the diet.

Methionine is coded for by the initiation codon meaning it indicates the start of the coding region and is the first amino acid produced in a nascent polypeptide during mRNA translation.

Usage examples of "methionine".

It is interesting that the methyl donor for this reaction does not seem to be methionine of S-adenosylmethionine as is typical for most reported 0-methylation reactions.

With a high-protein diet, vitamins, glucose and methionine, he might have had a chance.

Since most of the abbreviations consist of the first three letters of the name, they are not difficult to memorize: glycine gly alanine ala valine val leucine leu asparagine asp'Ntb aspartic acid asp glutamine ghrNH2 glutamic acid glu THE HUMAN BRAIN isoleucine proline phenylalanine tyrosine tryptophan serine threonine ileu pro phe tyr try ser thr lysine histidine lys his arginine methionine arg met cystine cysteine cy-S-cy-SH Of the abbreviations that are more than the first three letters of the names, ileu, asp-NH2, and ghrNH2 should be clear.

A-T-A, which in mitochondrial DNA, as opposed to nuclear DNA, specified methionine.