Atom Nomenclature for ILC

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 ILC

Atom Name (V3) Atom Name (V2)
C1 C1
C2 C2
C8 C8
C9 C9
C10 C10
C11 C11
C12 C12
C13 C13
C14 C14
C16 C16
C20 C20
C21 C21
C22 C22
C24 C24
C27 C27
O3 O3
C4 C4
N17 N17
C18 C18
F19 F19
O23 O23
C25 C25
S26 S26
C28 C28
O29 O29
O30 O30
H1 H1
H8 H8
H11 H11
H12 H12
H13 H13
H14 H14
H20 H20
H24 H24
H41 1H4
H42 2H4
H43 3H4
HN17 HN17
H25 H25
HO30 HO30