Atom Nomenclature for AA4

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 AA4

Atom Name (V3) Atom Name (V2)
N N
CA CA
C C
O O
CB CB
CG CG
CD CD
OE OE
OXT OXT
H H
H2 HN
HA HA
HB2 HB1
HB3 HB2
HG2 HG1
HG3 HG2
HD2 HD1
HD3 HD2
HE HOE
HXT HXT