Data Item _pdbx_refine_component.real_space_R_main_chain
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General 
- Item name
- _pdbx_refine_component.real_space_R_main_chain
- Category name
- pdbx_refine_component
- Attribute name
- real_space_R_main_chain
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
Real space R factor of electron density for each component,
residue side chain, or main chain.
The real space R factor is calculated by the equation
R_real = [Sumi (|Dobs - Dcal|)]/[Sumi (|Dobs + Dcal|)]
Where:
Dobs is the observed electron density,
Dcal is the calculated electron density,
summation is for all the grid points
Ref: Branden, C.I. & Jones, T.A. (1990). Nature, 343, 687-689
Data Type 
- Data type code
- float
- Data type detail
- float item types are the subset of numbers that are the floating numbers.
- Primitive data type code
- numb
- Regular expression
- -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?