Atom Nomenclature for CAI

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 CAI

Atom Name (V3) Atom Name (V2)
C20 C20
C21 C21
O21 O21
C1 C1
C2 C2
C3 C3
C4 C4
C5 C5
C6 C6
C7 C7
C8 C8
C9 C9
C10 C10
C11 C11
C12 C12
C13 C13
C14 C14
C15 C15
C16 C16
C22 C22
O1 O1
O9 O9
O12 O12
O15 O15
C1A C1A
C2A C2A
C3A C3A
C4A C4A
C5A C5A
C6A C6A
C7A C7A
O1A O1A
O2A O2A
N3A N3A
O5A O5A
O4 O4
C1B C1B
C2B C2B
C3B C3B
C4B C4B
C5B C5B
C6B C6B
C7B C7B
O1B O1B
O3B O3B
O4B O4B
O5B O5B
C1C C1C
C2C C2C
C3C C3C
C4C C4C
C5C C5C
O1C O1C
C17 C17
C18 C18
C19 C19
O3 O3
O17 O17
C8A C8A
H201 1H20
H202 2H20
H21 H21
H21A 1H2
H22 2H2
H3 H3
H4 H4
H5 H5
H6 H6
H71 1H7
H72 2H7
H8 H8
H10 H10
H11 H11
H12 H12
H13 H13
H141 1H14
H142 2H14
H15 H15
H161 1H16
H162 2H16
H163 3H16
H221 1H22
H222 2H22
H223 3H22
HC1A HC1A
HC2A HC2A
HC3A HC3A
HC4A HC4A
HC5A HC5A
H6A1 1H6A
H6A2 2H6A
H6A3 3H6A
H7A1 1H7A
H7A2 2H7A
H7A3 3H7A
HO2A HO2A
HC1B HC1B
H2B1 1H2B
H2B2 2H2B
HC4B HC4B
HC5B HC5B
H6B1 1H6B
H6B2 2H6B
H6B3 3H6B
H7B1 1H7B
H7B2 2H7B
H7B3 3H7B
HO3B HO3B
H2C1 1H2C
H2C2 2H2C
HC3C HC3C
H4C1 1H4C
H4C2 2H4C
H4C3 3H4C
H5C1 1H5C
H5C2 2H5C
H5C3 3H5C
H181 1H18
H182 2H18
H183 3H18
H191 1H19
H192 2H19
H193 3H19
H8A1 1H8A
H8A2 2H8A
H8A3 3H8A