Atom Nomenclature for MXA

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 MXA

Atom Name (V3) Atom Name (V2)
N1 N1
C2 C2
N2 N2
N3 N3
C4 C4
N4 N4
C4A C4A
C5 C5
C5M C5M
C6 C6
C7 C7
N8 N8
C8A C8A
C9 C9
C1' C1'
C2' C2'
O2' O2'
C21 C21
C3' C3'
C4' C4'
C5' C5'
O5' O5'
C51 C51
C6' C6'
HN21 1HN2
HN22 2HN2
HN41 1HN4
HN42 2HN4
H5M1 1H5M
H5M2 2H5M
H5M3 3H5M
H7 H7
H91 1H9
H92 2H9
H211 1H21
H212 2H21
H213 3H21
H3' H3'
H4' H4'
H511 1H51
H512 2H51
H513 3H51
H6' H6'