Nonstandard amino acids are usually formed through modifications to standard amino acids. For example, homocysteine is formed through the transsulfuration pathway or by the demethylation of methionine via the intermediate metabolite S-adenosylmethionine, while hydroxyproline is made by a post translational modification of proline.
nonstandard amino acids are usually formed through modifications to standard amino acids for example homocysteine is formed through the transsulfuration pathway or by the demethylation of methionine via the intermediate metabolite s-adenosylmethionine while hydroxyproline is made by a post translational modification of proline