Atom Nomenclature for TPX

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 TPX

Atom Name (V3) Atom Name (V2)
C C
CA CA
CB CB
CC CC
CD CD
CE CE
O O
OA OA
OB OB
CK CK
N N
OC OC
OD OD
S S
CF CF
CG1 CG1
CG2 CG2
CH1 CH1
CH2 CH2
CI CI
CJ CJ
H H
HA HA
HB HB
HD2 2HD
HD1 1HD
HE3 3HE
HE2 2HE
HE1 1HE
HOA HOA
HK2 2HK
HK1 1HK
HN1 1H N
HG1 HG1
HG2 HG2
HH1 HH1
HH2 HH2
HJ3 3HJ
HJ2 2HJ
HJ1 1HJ