Atom Nomenclature for GPA

The atom nomenclature in PDB data files was revised with the release of data in the PDB Format Version 3.0. These changes make the PDB atom names used by PDB compliant with existing IUPAC nomenclature for standard amino acid and nucleotides (Pure & Appl. Chem., 70, 117-142, 1998) with the exception of the well established convention for C-terminal atoms OXT and HXT. A small number of additional changes were introduced in Version 3 to make atom labeling more conventional. The following chemical diagrams and tables provide the correspondences between atom names used in Version 3 and Version 2 PDB formats.

Labeled Chemical Diagrams

Chemical diagram with format V3 atom labels (heavy atoms)
Chemical diagram with format V3 atom labels (all atoms)
Chemical diagram with format V2 atom labels (heavy atoms)
Chemical diagram with format V2 atom labels (all atoms)

Atom Name Correspondences for GPA

Atom Name (V3) Atom Name (V2)
N N
CA CA
C C
OA1 OA1
OA2 OA2
CD CD
NE NE
CZ CZ
NH1 NH1
NH2 NH2
HN1 HN1
HN2 HN2
HA HA
HXT HXT
HCD1 1HCD
HCD2 2HCD
HNE1 1HNE
HN11 1HN1
HN12 2HN1
HN21 1HN2