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![]() ![]() For example, dipeptide Ala-Gly is written AG, and tripeptide Gly-His-Lys is written as GHL. For polypeptides, one-letter abbreviations of the amino acid residues are usually written in a sequence from N-terminus to C-terminus. For example, the dipeptide alan ylglycine can be written as Ala-Gly, and the tripeptide glyc ylhistid yllysine as Gly-His-Lys. Often three-letter abbreviations of the amino acids in a peptide are written in a sequence from N-terminus to C-terminus, separated by hyphens. For example, the dipeptide of alanine and glycine is alan ylglycine and the tripeptide of glycine, histidine, and lysine is glyc ylhistid yllysine. For example, lysine in the tripeptide shown above is C-terminus.Īmino acids in a peptide are written horizontally from left to right, where N-terminus is the leftmost amino acid and C-terminus is the rightmost amino acid.Ī peptide is named by listing the names of its constituent amino acids in a sequence from N-terminus to C-terminus, with the last syllable changed to yl.
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