Atom Nomenclature for AME

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 AME

Atom Name (V3) Atom Name (V2)
CT2 CT2
CT1 CT1
OT OT
CB CB
CG CG
SD SD
CE CE
C C
O O
OXT OXT
N N
CA CA
HT23 3HT2
HT22 2HT2
HT21 1HT2
HB2 2HB
HB1 1HB
HG2 2HG
HG1 1HG
HE3 3HE
HE2 2HE
HE1 1HE
HO HO
HN1 1HN
HA HA