Atom Nomenclature for DX2

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 DX2

Atom Name (V3) Atom Name (V2)
C4 C4
C6 C6
C7 C7
N1 N1
N2 N2
N3 N3
CAG CAG
CAE CAE
CAD CAD
CAF CAF
CAH CAH
CAN CAN
N5 N5
C4A C4A
N4 N4
C2 C2
C8A C8A
N8 N8
NAB NAB
HN2 HN2
HN2A HN2A
HAG HAG
HAE HAE
HAD HAD
HAF HAF
HAH HAH
HN4 HN4
HN4A HN4A
HNAB HNAB
HNAA HNAA