Atom Nomenclature for BOM

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 BOM

Atom Name (V3) Atom Name (V2)
O1 O1
C2 C2
C4 C4
C7 C7
C10 C10
C13 C13
C16 C16
C19 C19
C22 C22
C25 C25
C28 C28
C31 C31
C33 C33
C35 C35
C37 C37
C39 C39
C42 C42
HO1 HO1
H21 1H2
H22 2H2
H41 1H4
H42 2H4
H71 1H7
H72 2H7
H101 1H10
H102 2H10
H131 1H13
H132 2H13
H161 1H16
H162 2H16
H191 1H19
H192 2H19
H221 1H22
H222 2H22
H251 1H25
H252 2H25
H281 1H28
H311 1H31
H331 1H33
H351 1H35
H371 1H37
H372 2H37
H391 1H39
H392 2H39
H421 1H42
H422 2H42
H423 3H42