Data Category chemical_conn_atom

General

Category name
chemical_conn_atom
Required in PDB entries
no
Category group membership
chemical_group
Used in current PDB entries
No

Category Relationship Diagrams

70
View full category relationship diagram including all dictionary data categories

Category 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.

Category Example

 
    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