Atom Nomenclature for SRS

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 SRS

Atom Name (V3) Atom Name (V2)
S1 S1
N5 N5
N6 N6
C2 C2
C3 C3
C4 C4
O3 O3
N2 N2
C5 C5
C6 C6
O4 O4
N3 N3
C7 C7
C8 C8
C9 C9
C10 C10
C11 C11
C12 C12
N4 N4
C13 C13
C14 C14
C15 C15
C16 C16
C17 C17
C18 C18
C19 C19
C20 C20
C21 C21
C22 C22
C23 C23
C24 C24
C25 C25
C26 C26
HN5 HN5
HN6 HN6
H21 1H2
H22A 2H2
H3 H3
HN2 HN2
H5 H5
HN3 HN3
H71 1H7
H72 2H7
H81 1H8
H82 2H8
H91 1H9
H92 2H9
H101 1H10
H102 2H10
H111 1H11
H112 2H11
H121 1H12
H122 2H12
H131 1H13
H132 2H13
H14 H14
H151 1H15
H152 2H15
H153 3H15
H161 1H16
H162 2H16
H163 3H16
H171 1H17
H172 2H17
H19 H19
H22 H22
H23 H23
H24 H24
H25 H25
H261 1H26
H262 2H26
H263 3H26