Atom Nomenclature for EP2

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 EP2

Atom Name (V3) Atom Name (V2)
CB CB
OXT OXT
N N
CA CA
C C
O O
N1 N1
CA1 CA1
C1 C1
O1 O1
N2 N2
CA2 CA2
C2 C2
O2 O2
CB1 CB1
CG CG
CD1 CD1
CD2 CD2
O11 O11
C11 C11
C21 C21
O21 O21
C31 C31
C41 C41
O41 O41
N3 N3
CA3 CA3
C3 C3
O3 O3
CB2 CB2
CG1 CG1
CD11 CD11
CD21 CD21
N4 N4
CA4 CA4
C4 C4
O4 O4
CB3 CB3
CG2 CG2
CD CD
OXT1 OXT1
HB1 HB1
HB2 HB2
HB3 HB3
H H
HA1 HA1
HA2 HA2
H1 H1
HA21 HA21
HA3 HA3
H2 H2
HA HA
HB21 HB21
HB31 HB31
HG HG
HD11 HD11
HD12 HD12
HD13 HD13
HD21 HD21
HD22 HD22
HD23 HD23
H21 H21
H31 H31
H3 H3
HA4 HA4
HB22 HB22
HB32 HB32
HG1 HG1
HD14 HD14
HD15 HD15
HD16 HD16
HD24 HD24
HD25 HD25
HD26 HD26
HA5 HA5
HB23 HB23
HB33 HB33
HG2 HG2
HG3 HG3
HD2 HD2
HD3 HD3
HXT HXT