Non-Standard Residue: Difference between revisions
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Any residue of protein or nucleic acid that is not included in the list of [[Standard Residues]] is considered ''Non-Standard''. The atomic coordinates for atoms in non-standard residues are given in records of type [[HETATM]] in the [[PDB file]] format. | Any residue of protein or nucleic acid that is not included in the list of [[Standard Residues]] is considered ''Non-Standard''. The atomic coordinates for atoms in non-standard residues are given in records of type [[HETATM]] in the [[PDB file]] format. | ||
In addition to the 20 historically "standard" [[Amino Acids|amino acids]], two additional unusual but genetically encoded amino acids | In addition to the 20 historically "standard" [[Amino Acids|amino acids]], two additional unusual but genetically encoded amino acids have been considered to be "standard" by the [[PDB]] since February, 2014<ref name="pdb22">[https://www.wwpdb.org/news/news?year=2014#5764490799cccf749a90cddf Announcement: Standardization of Amino Acid Nomenclature], World Wide Protein Data Bank News, January 8, 2014.</ref><ref name="sec">[[1fdo]], released 1997, had selenocysteine 140 in chain A coded as HETATM CSE through the [ftp://snapshots.wwpdb.org/20140102/pub/pdb/data/structures/divided/pdb/fd/pdb1fdo.ent.gz WWPDB snapshot of 2014-01-02], but had it coded aa ATOM SEC in the [ftp://snapshots.wwpdb.org/20141203/pub/pdb/data/structures/divided/pdb/fd/pdb1fdo.ent.gz 2014-12-03 snapshot]. See [[Getting Unremediated PDB Files]].</ref>: [[selenocysteine]] and [[pyrrolysine]]. However, elsewhere these may still be designated as "non-standard". | ||
Examples: | Examples: | ||