Atom Nomenclature for HSX

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 HSX

Atom Name (V3) Atom Name (V2)
C1 C1'
O4 O1'
C2 C2'
O2 O2'
C3 C3'
O3 O3'
C4 C4'
C5 C5'
O5 O5'
P' P'
O1X O1X
O2X O2X
O3X O3X
O1 O1
H1 H1'
H2 H2'
HO2 HO2'
H3 H3'
HO3 HO3'
H4 H4'
H51 H5'
H52 H5'A
HO2X HO2X
HO3X HO3X
HO1 HO1