Atom Nomenclature for CDM

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 CDM

Atom Name (V3) Atom Name (V2)
N1 N1
C2 C2
N3 N3
C4 C4
C5 C5
C6 C6
O2 O2
N4 N4
C1' C1*
C2' C2*
O2' O2*
C3' C3*
C4' C4*
O4' O4*
O3' O3*
C5' C5*
O5' O5*
PA PA
O1A O1A
O2A O2A
O3A O3A
PB PB
O1B O1B
O2B O2B
O3B O3B
C1M C1M
C2M C2M
O2M O2M
C3M C3M
C4M C4M
C5M C5M
O3M O3M
O4M O4M
H5 H5
H6 H6
H41 1H4
H42 2H4
H1' H1*
H2' H2*
HO'2 2HO*
H3' H3*
H4' H4*
H3T H3T
H5'1 1H5*
H5'2 2H5*
HO2A HO2A
HO1B HO1B
H1M1 1H1M
H1M2 2H1M
H2M1 1H2M
H2M2 2H2M
H4M1 1H4M
H4M2 2H4M
H5M1 1H5M
H5M2 2H5M
H5M3 3H5M
H3M H3M
H4M H4M