Atom Nomenclature for IYT

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 IYT

Atom Name (V3) Atom Name (V2)
CAN CAN
CN CN
ON ON
N N
CA CA
CB CB
CG CG
CD1 CD1
CE1 CE1
CD2 CD2
CE2 CE2
CZ CZ
OH OH
I1 I1
I2 I2
C C
O O
NT NT
CAT CAT
CBT CBT
OGT OGT
CGT CGT
CT CT
OX1 OX1
OX2 OX2
HAN1 1HAN
HAN2 2HAN
HAN3 3HAN
H HN
HA HA
HB2 1HB
HB3 2HB
HD1 HD1
HD2 HD2
HH HOH
HNT HNT
HAT HAT
HBT HBT
HGT HGT
HGT1 1HGT
HGT2 2HGT
HGT3 3HGT
HX1 HX1