Data Item _ndb_struct_na_base_pair_step.i_symmetry_2
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General 
- Item name
- _ndb_struct_na_base_pair_step.i_symmetry_2
- Category name
- ndb_struct_na_base_pair_step
- Attribute name
- i_symmetry_2
- Required in PDB entries
- yes
- Used in current PDB entries
- Yes, in about 7.2 % of entries
Item Description
Describes the symmetry operation that should be applied to the
coordinates of the i-th base to generate the first partner
in the second base pair of the step.
Item Example1
4
Item Example2
7_645
Data Type 
- Data type code
- symop
- Data type detail
- symop item types take the form n_klm, where n refers to the symmetry operation that is applied to the coordinates in the ATOM_SITE category identified by _atom_site_label. It must match a number given in _symmetry_equiv_pos_site_id. k, l, and m refer to the translations that are subsequently applied to the symmetry transformed coordinates to generate the atom used. These translations (x,y,z) are related to (k,l,m) by k = 5 + x l = 5 + y m = 5 + z By adding 5 to the translations, the use of negative numbers is avoided.
- Primitive data type code
- char
- Regular expression
- ([1-9]|[1-9][0-9]|1[0-8][0-9]|19[0-2])(_[1-9][1-9][1-9])?
- Default value
- 1_555