PYL
Pyrrolysine (symbol Pyl or O), encoded by the "amber" stop codon UAG, is a proteinogenic amino acid that is used in some methanogenic archaea and in bacteria. It consists of lysine with a 4-methylpyrroline-5-carboxylate in amide linkage with the εN of the lysine. Its pyrroline side-chain is similar to that of lysine in being basic and positively charged at neutral pH.
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