Atom Nomenclature for 3GL

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 3GL

Atom Name (V3) Atom Name (V2)
N N
CA CA
C C
CB CB
CG CG
OH OH
CD CD
OE1 OE1
OE2 OE2
O O
OXT OXT
H HN1
H2 HN2
HA HA
HB1C HB1C
HB2C HB2C
HG HG
HH HH
HE1 HE1
HXT HXT