Atom Nomenclature for TCO

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 TCO

Atom Name (V3) Atom Name (V2)
N N
CA CA
C C
O O
CG2 CG2
CD2 CD2
CE CE
CD1 CD1
CG1 CG1
CB CB
C1 C1
O1 O1
O2 O2
C4 C4
C3 C3
C6 C6
C5 C5
HN HN
HA HA
HC HC
HG21 1HG2
HG22 2HG2
HD21 1HD2
HD22 2HD2
HE1 1HE
HE2 2HE
HD11 1HD1
HD12 2HD1
HG11 1HG1
HG12 2HG1
HB HB
H41 1H4
H42 2H4
H43 3H4
H61 1H6
H62 2H6
H63 3H6
H51 1H5
H52 2H5
H53 3H5