Atom Nomenclature for APR

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 APR

Atom Name (V3) Atom Name (V2)
N1 N1
C2 C2
N3 N3
C4 C4
C5 C5
C6 C6
N6 N6
N7 N7
C8 C8
N9 N9
C1' C1*
C2' C2*
O2' O2*
C3' C3*
O3' O3*
O4' O4*
C4' C4*
C5' C5*
O5' O5*
PA PA
O1A O1A
O2A O2A
O3A O3A
PB PB
O1B O1B
O2B O2B
O5D RO5*
C5D RC5*
O4D RO4*
O1D RO1*
C1D RC1*
O2D RO2*
C2D RC2*
O3D RO3*
C3D RC3*
C4D RC4*
H2 H2
H61 1H6
H62 2H6
H8 H8
H'1 1H*
H'2 2H*
HO'2 2HO*
H'3 3H*
HO'3 3HO*
H'4 4H*
H5'1 1H5*
H5'2 2H5*
HOA2 2HOA
HOB2 2HOB
H5R1 1H5R
H5R2 2H5R
HOR1 1HOR
HR'1 1HR*
HOR2 2HOR
HR'2 2HR*
HOR3 3HOR
HR'3 3HR*
HR'4 4HR*