?:definition
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The incorporation of pyrrolysine, also known as lysine methylamine methyltransferase cofactor adduct, into a peptide; uses a special tRNA that recognizes the UAG codon as a modified lysine, rather than as a termination codon. Pyrrolysine may be synthesized as a free amino acid or synthesized from a lysine charged tRNA before its incorporation; it is not a posttranslational modification of peptidyl-lysine; this modification is found in several Methanosarcina methylamine methyltransferases. [PMID:11435424, PMID:17204561, RESID:AA0321]
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