Atom Nomenclature for UBA

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 UBA

Atom Name (V3) Atom Name (V2)
OXT OXT
C C
O O
CA CA
N N
CB CB
N4 N4
C5 C5
O8 O8
N6 N6
C1 C1
O7 O7
C2 C2
C6 C6
C3 C3
C17 C17
C18 C18
C23 C23
C22 C22
S20 S20
C19 C19
C10 C10
O2 O2
O1 O1
HO HO
HA HA
HN1 1HN
HN2 2HN
HB1 1HB
HB2 2HB
H61 1H6
H62 2H6
H63 3H6
H3 H3
H171 1H17
H172 2H17
H23 H23
H22 H22
HO2 HO2