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  • Biology

Methionine

Methionine (Met or M) is an amino acid present in proteins.

Structure of methionine

Like all of the amino acids, methionine has two functional groups, an amine group (NH2) and a carboxyl group (COOH). It has a relatively long side chain: CH2-CH2-S-CH3. and is a non-polar amino acid.

Function of methionine

Methionine is an essential amino acid which is obtained from the diet (seeds, meat, fish).

It is a specific amino acid in that it is the first one to be incorporated into protein chains by the ribosome. Methionine is only coded for by a single codon (AUG, in the universal gene code) on the messenger RNA,

Methionine is an essential amino acid. © Ben Mills, Wikimedia, public domain Methionine is an essential amino acid. © Ben Mills, Wikimedia, public domain

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