Atom Nomenclature for SDK

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 SDK

Atom Name (V3) Atom Name (V2)
C1 C1
C2 C2
C3 C3
C4 C4
C5 C5
C6 C6
C7 C7
O8 O8
C9 C9
O10 O10
C11 C11
C12 C12
C13 C13
C14 C14
C15 C15
C16 C16
O17 O17
N18 N18
C19 C19
N20 N20
C21 C21
O22 O22
C23 C23
C24 C24
C25 C25
C26 C26
C27 C27
C28 C28
C29 C29
O30 O30
C31 C31
O32 O32
C33 C33
C34 C34
C35 C35
C36 C36
C37 C37
C38 C38
O39 O39
N40 N40
C41 C41
N42 N42
H1 H1
H2 H2
H3 H3
H5 H5
H6 H6
H71 1H7
H72 2H7
H11 H11
H121 1H12
H122 2H12
H13 H13
H141 1H14
H142 2H14
H143 3H14
H151 1H15
H152 2H15
H153 3H15
HN8 HN8
H191 1H19
H192 2H19
HN2 HN2
H23 H23
H24 H24
H25 H25
H27 H27
H28 H28
H291 1H29
H292 2H29
H33 H33
H341 1H34
H342 2H34
H35 H35
H361 1H36
H362 2H36
H363 3H36
H371 1H37
H372 2H37
H373 3H37
HN4 HN4
H411 1H41
H412 2H41
HN HN