Standard Residues: Difference between revisions

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 ''Standard residues'' ([[Amino Acids|standard amino acids]] and nucleotides) are defined in the [[PDB files|PDB data file format]], and have record type ATOM in PDB-format atomic coordinate files. Standard residues are:
-* The [[Amino Acids|20 standard amino acids]], plus ambiguous residue codes ASX, GLX, and undetermined UNK.
+* The [[Amino Acids|20 standard amino acids]], plus ambiguous residue codes ASX, GLX, and undetermined UNK. In 2014, the [[PDB]] is in the process of adding [[Amino Acids|SEC (U) and PYL (O)]] making 22 standard amino acids.
-* Twelve standard nucleotides A, C, G, I, T, U, DA, DC, DG, DI, DT, and DU plus UNK. (I is inosine.)
+* Twelve standard nucleotides A, C, G, I, T, U, DA, DC, DG, DI, DT, and DU plus UNK. (I is inosine.) The PDB [http://www.wwpdb.org/documentation/format33/sect4.html#HET provides this list under HET].
 The distinction between ribonucleotides (A, C, G, I, T, U) and deoxyribonucleotides (DA, DC, DG, DI, DT, DU) was first made when the PDB was remediated, effective August 1, 2007. The unremediated files can still be obtained, see [[Getting Unremediated PDB Files]].