Atom Nomenclature for SS3

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 SS3

Atom Name (V3) Atom Name (V2)
N1 N1
N3 N3
C4 C4
C5 C5
C6 C6
C8 C8
C13 C13
C15 C15
C9 C9
C17 C17
C20 C20
C21 C21
C22 C22
C24 C24
C1 C1
C2 C2
C3 C3
N5 N5
C14 C14
C16 C16
C18 C18
C19 C19
C26 C26
O1 O1
C23 C23
C25 C25
N4 N4
H2 H2
H5 H5
HA HA
H9C1 1H9C
H9C2 2H9C
H9C3 3H9C
H6 H6
H21 H21
H19 H19
H18 H18
H241 1H24
H242 2H24
H23 H23
H251 1H25
H252 2H25
H4N1 1H4N
H4N2 2H4N
H13 H13
H16 H16
H14 H14
H26 H26
H15 H15