Atom Nomenclature for UNI

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 UNI

Atom Name (V3) Atom Name (V2)
CA CA
CA2 CA2
OA2 OA2
OA3 OA3
CA4 CA4
CA5 CA5
CA6 CA6
OA6 OA6
CB1 CB1
CB2 CB2
CB3 CB3
CB4 CB4
CB5 CB5
CB6 CB6
CG1 CG1
CG2 CG2
CG3 CG3
CG4 CG4
CD1 CD1
CD2 CD2
CD3 CD3
CD4 CD4
CD5 CD5
CD6 CD6
N N
S S
O1 O1
O2 O2
CZ1 CZ1
CZ2 CZ2
CZ3 CZ3
CZ4 CZ4
CZ5 CZ5
CZ6 CZ6
CZ7 CZ7
NZ7 NZ7
HO6 HO6
HB2 HB2
HB3 HB3
HB4 HB4
HB6 HB6
HG1 HG1
HG2 HG2
HG31 1HG3
HG32 2HG3
HG41 1HG4
HG42 2HG4
HD11 1HD1
HD12 2HD1
HD21 1HD2
HD22 2HD2
HD31 1HD3
HD32 2HD3
HD41 1HD4
HD42 2HD4
HD51 1HD5
HD52 2HD5
HD61 1HD6
HD62 2HD6
HN HN
HZ2 HZ2
HZ3 HZ3
HZ5 HZ5
HZ6 HZ6