Atom Nomenclature for D3

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 D3

Atom Name (V3) Atom Name (V2)
P P
OP1 O1P
OP2 O2P
OP3 O3P
O5' O5*
C5' C5*
C4' C4*
O4' O4*
C3' C3*
O3' O3*
C2' C2*
C1' C1*
N1A N1A
C2A C2A
N3A N3A
C4A C4A
C5A C5A
C1B C1B
C2B C2B
C3B C3B
C4B C4B
C5B C5B
C6B C6B
N N
C C
O O
C1C C1C
C2C C2C
C3C C3C
C4C C4C
C5C C5C
C6C C6C
HOP2 2HOP
HOP3 3HOP
H5' 1H5*
H5'' 2H5*
H4' H4*
H3' H3*
HO3' *HO3
H2' 1H2*
H2'' 2H2*
H1' H1*
H2A H2A
H5A H5A
H2B H2B
H4B H4B
H5B H5B
H6B H6B
HN HN
H2C H2C
H3C H3C
H4C H4C
H5C H5C
H6C H6C