Atom Nomenclature for TC3

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 TC3

Atom Name (V3) Atom Name (V2)
C2 C2
C1 C1
O3 O3
P P
O2 O2
N N
C3 C3
OXT OXT
H21C H21C
H22C H22C
H23C H23C
H11C H11C
H12C H12C
HN1 HN1
HXT HXT
H31C H31C
H32C H32C
H33C H33C