Atom Nomenclature for IMO

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 IMO

Atom Name (V3) Atom Name (V2)
P P
O1 O1
C2 C2
C1' C1'
C2' C2'
C3' C3'
C4' C4'
C5' C5'
O2 O2
O3 O3
PA PA
O1A O1A
O2A O2A
O3A O3A
O5' O5'
O4' O4'
N9 N9
C4 C4
N3 N3
N1 N1
C6 C6
O6 O6
C5 C5
N7 N7
C8 C8
O2' O2'
O3' O3'
HO1 HO1
H2 H2
H1' H1'
H2' H2'
H3' H3'
H4' H4'
H5'1 1H5'
H5'2 2H5'
HO2 HO2
HOA1 1HOA
HOA2 2HOA
H81 1H8
HO'2 2HO'
HO'3 3HO'