Atom Nomenclature for PAO

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 PAO

Atom Name (V3) Atom Name (V2)
N N
CA CA
CB CB
CG CG
CD CD
NE NE
C C
O O
OXT OXT
C1 C1
O1 O1
C1P C1P
P P
O1P O1P
O2P O2P
O3P O3P
HN1 1HN
HN2 2HN
HA HA
HB1 1HB
HB2 2HB
HG1 1HG
HG2 2HG
HD1 1HD
HD2 2HD
HNE HNE
HXT HXT
HP1 1HP
HP2 2HP
HOP2 2HOP
HOP3 3HOP