Announcement: Standardization of Amino Acid Nomenclature The wwPDB is transitioning to use the nomenclature for pyrrolysine and selenocysteine as recommended by the joint nomenclature committee of IUPAC/IUBMB.
Starting in January, PYL (for pyrrolysine) and SEC (for selenocysteine) will be used where three-letter codes appear for amino acids in new releases and updated in entries currently in the archive (<50 entries). In April, the letter O (for pyrrolysine) and U (for selenocysteine) will be used where one-letter codes appear for amino acids in new releases and updated in entries currently in the archive. Questions and comments should be sent to i...@wwpdb.org.
