Atom Nomenclature for NRG

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 NRG

Atom Name (V3) Atom Name (V2)
N N
CA CA
CB CB
CG CG
CD CD
NE NE
CZ CZ
NH1 NH1
NH2 NH2
C C
O OA1
OXT OA2
N1 N1
O2 O2
O3 O3
H HN1
H2 HN2
HA HCA
HCB1 HCB1
HCB2 HCB2
HCG1 HCG1
HCG2 HCG2
HCD1 HCD1
HCD2 HCD2
HNE HNE
HNH1 HNH1
HNH2 HNH2
HXT HOA2