Atom Nomenclature for ST2

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 ST2

Atom Name (V3) Atom Name (V2)
C' C'
O1' O1'
O2' O2'
C1 C1
C2 C2
C3 C3
N3 N3
C4 C4
N4 N4
C4' C4'
O4' O4'
CM4 CM4
C5 C5
O5 O5
C6 C6
HO2' 'HO2
H2 H2
HN31 1HN3
HN32 2HN3
HN4 HN4
HM41 1HM4
HM42 2HM4
HM43 3HM4
HO5 HO5
H6 H6