Atom Nomenclature for MXD

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 MXD

Atom Name (V3) Atom Name (V2)
NAO NAO
CAE CAE
CAF CAF
NAC NAC
OAN OAN
CAA CAA
NAM NAM
NAB NAB
CAD CAD
NAI NAI
CAG CAG
CAK CAK
CAL CAL
CAJ CAJ
CAH CAH
HAO1 1HAO
HAO2 2HAO
HAF HAF
HAM1 1HAM
HAM2 2HAM
HAG1 1HAG
HAG2 2HAG
HAK1 1HAK
HAK2 2HAK
HAL1 1HAL
HAL2 2HAL
HAJ1 1HAJ
HAJ2 2HAJ
HAH1 1HAH
HAH2 2HAH