Atom Nomenclature for MRK

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 MRK

Atom Name (V3) Atom Name (V2)
S1 S1
C2 C2
C3 C3
N4 N4
C5 C5
N6 N6
C7 C7
O8 O8
C9 C9
C10 C10
C11 C11
C12 C12
C13 C13
F14 F14
C15 C15
S16 S16
N17 N17
C18 C18
N19 N19
C20 C20
C21 C21
C22 C22
N23 N23
H2 H2
H3 H3
HN6 HN6
H11 H11
H15 H15
H20 H20
H21 H21
H221 1H22
H222 2H22
H223 3H22
H231 1H23
H232 2H23