Atom Nomenclature for IH3

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 IH3

Atom Name (V3) Atom Name (V2)
C1 C1
NC NC
C3 C3
NA NA
C2 C2
NB NB
N10 N10
C7 C7
C8 C8
C9 C9
C4 C4
C5 C5
C6 C6
N20 N20
C19 C19
O19 O19
N17 N17
N18 N18
C21 C21
O21 O21
C16 C16
C14 C14
C13 C13
C12 C12
C15 C15
C11 C11
O11 O11
C23 C23
C22 C22
C24 C24
C25 C25
C26 C26
C27 C27
C28 C28
C29 C29
C30 C30
C31 C31
C32 C32
C33 C33
C34 C34
C35 C35
HNC HNC
HC2 HC2
HNB1 1HNB
HNB2 2HNB
HN10 HN10
HC71 1HC7
HC72 2HC7
HC8 HC8
HC91 1HC9
HC92 2HC9
HC41 1HC4
HC42 2HC4
HC5 HC5
HC61 1HC6
HC62 2HC6
H161 1H16
H162 2H16
HC13 HC13
HC12 HC12
H151 1H15
H152 2H15
H153 3H15
HC23 HC23
H221 1H22
H222 2H22
HC25 HC25
HC26 HC26
HC27 HC27
HC28 HC28
HC29 HC29
HC31 HC31
HC32 HC32
HC33 HC33
HC34 HC34
HC35 HC35