Atom Nomenclature for EPC

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 EPC

Atom Name (V3) Atom Name (V2)
C C
N2 N2
N1 N1
C2 C2
C2A C2A
C3 C3
O1 O1
C4 C4
C4A C4A
C5 C5
C6 C6
C5A C5A
O2 O2
P1 P1
O3 O3
O4 O4
O5 O5
P2 P2
O7 O7
O8 O8
O6 O6
CA CA
H1C1 1H1C
H2A1 1H2A
H2A2 2H2A
H2A3 3H2A
HO1 HO1
H4A1 1H4A
HC61 1HC6
H5A1 1H5A
H5A2 2H5A
HO4 HO4
HO5 HO5
HO8 HO8
HO6 HO6
HCA1 1HCA
HCA2 2HCA
HCA3 3HCA