Atom Nomenclature for AM4

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 AM4

Atom Name (V3) Atom Name (V2)
C2 C2
C3 C3
C4 C4
C11 C11
N13 N13
N12 N12
C5 C5
C6 C6
C1 C1
S7 S7
C10 C10
O9 O9
O8 O8
H2 H2
H3 H3
H13 H13
H121 1H12
H122 2H12
H5 H5
H6 H6
H101 1H10
H102 2H10
H103 3H10