The asymmetric α-carbon in 21 of the standard amino acids (all except glycine) is a chiral (stereogenic) center. IUPAC/IUB 1971 publication defining one-letter codes.Ĭlick on the image below to see it full size with details on 21 amino acids. † Asx: Asn or Asp Glx: Gln or Glu Unk: unknown. Selenocysteine and Pyrrolysine have been included as standard by the World Wide Protein Data Bank. *Since the mid-20th century, there were 20 standard amino acids. Mnemonic names are intended to help you to remember the one-letter codes, but are not the correct names.
Here are the names of the twenty-two standard amino acids, with their three and one-letter abbreviations. 4 Structure, Properties, Behaviors in Proteins.3.1 Selenocysteine: the 21st amino acid.1 22 Standard Amino Acids and Mnemonics.
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