Data Item _struct_mon_nucl.P
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General 
- Item name
- _struct_mon_nucl.P
- Category name
- struct_mon_nucl
- Attribute name
- P
- Required in PDB entries
- no
- Used in current PDB entries
- No
Item Description
P is the phase angle of pseudorotation for five membered rings.
This formulation is used for ribo and deoxyribo sugars in nucleic
acids.
(tau4 +tau1)-(tau3+tau0)
P = ATAN (-------------------------)
2tau2 (sin 36+sin 72)
If tau2 is <0, then P=P+180
This formulation is by Altona and Sundaralingam (1972), J.A.C.S.,
94, 8205-8212.
Data Type 
- Data type code
- float
- Data type detail
- int 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]+)?
- Units
- degrees