Atom Nomenclature for 012

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 012

Atom Name (V3) Atom Name (V2)
C C
O O
N N
CA CA
CB CB
CG CG
CD1 CD1
CD2 CD2
CE1 CE1
CE2 CE2
CZ CZ
C1 C1
OG OG
C2 C2
N2 N2
C20 C20
C21 C21
C22 C22
C23 C23
C24 C24
C25 C25
C26 C26
N27 N27
C28 C28
C29 C29
C30 C30
N31 N31
C32 C32
O33 O33
N34 N34
C35 C35
C36 C36
C41 C41
C42 C42
C43 C43
C44 C44
C45 C45
C46 C46
O47 O47
C48 C48
HN HN
HA HA
HB HB
HBA HBA
HD1 HD1
HD2 HD2
HE1 HE1
HE2 HE2
HZ HZ
H1 H1
HOG HOG
H2 H2
H2A H2A
HN2 HN2
H20 H20
H20A H20A
H22 H22
H23 H23
H24 H24
H26 H26
H28 H28
H28A H28A
H28B H28B
H29 H29
H29A H29A
H29B H29B
H30 H30
HN31 HN31
H35 H35
H35A H35A
H36 H36
H36A H36A
H42 H42
H44 H44
H45 H45
H46 H46
H48 H48
H48A H48A
H48B H48B