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 are now considered to be "standard" by the [[PDB]]: [[selenocysteine]] and [[pyrrolysine]]. However, elsewhere these may still be designated as "non-standard". | In addition to the 20 historically "standard" [[Amino Acids|amino acids]], two additional unusual but genetically encoded amino acids are now considered to be "standard" by the [[PDB]]: [[selenocysteine]] and [[pyrrolysine]]. However, elsewhere these may still be designated as "non-standard". | ||
Examples: | Examples: | ||
