Protein Data Bank exchange dictionary (pdbx) version 1.0521
Category CHEMICAL_CONN_ATOM
Name:'chemical_conn_atom'
Description:
Data items in the CHEMICAL_CONN_ATOM category would not, in general, be used in a macromolecular CIF. See instead the ENTITY data items. Data items in the CHEMICAL_CONN_ATOM and CHEMICAL_CONN_BOND categories record details about the two-dimensional (2D) chemical structure of the molecular species. They allow a 2D chemical diagram to be reconstructed for use in a publication or in a database search for structural and substructural relationships. The CHEMICAL_CONN_ATOM data items provide information about the chemical properties of the atoms in the structure. In cases where crystallographic and molecular symmetry elements coincide, they must also contain symmetry-generated atoms, so that the CHEMICAL_CONN_ATOM and CHEMICAL_CONN_BOND data items will always describe a complete chemical entity.Example:
Example 1 - based on data set DPTD of Yamin, Suwandi, Fun, Sivakumar &
bin Shawkataly [Acta Cryst. (1996), C52, 951-953].
loop_
_chemical_conn_atom.number
_chemical_conn_atom.type_symbol
_chemical_conn_atom.display_x
_chemical_conn_atom.display_y
_chemical_conn_atom.NCA
_chemical_conn_atom.NH
1 S .39 .81 1 0
2 S .39 .96 2 0
3 N .14 .88 3 0
4 C .33 .88 3 0
5 C .11 .96 2 2
6 C .03 .96 2 2
7 C .03 .80 2 2
8 C .11 .80 2 2
9 S .54 .81 1 0
10 S .54 .96 2 0
11 N .80 .88 3 0
12 C .60 .88 3 0
13 C .84 .96 2 2
14 C .91 .96 2 2
15 C .91 .80 2 2
16 C .84 .80 2 2
|
Category groups:
inclusive_group
chemical_group
Category key:
_chemical_conn_atom.number
Mandatory category: no


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