This is an archive copy of the IUCr web site dating from 2008. For current content please visit https://www.iucr.org.
[IUCr Home Page] [CIF Home Page] [mmCIF Home Page]

Item _struct_mon_nucl.P


| Top | Dictionary | Category Groups | Categories | Items | Data |

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.

Category

struct_mon_nucl

Mandatory Code

no

Data Type Code

float

Units

degrees
| Top | Dictionary | Category Groups | Categories | Items | Data |



This HTML dictionary was created using the
CIFLIB C Language Application Program Interface
at the
Resource Collaboratory for Structural Bioinformatics
Rutgers University, Department of Chemistry
New Brunswick, New Jersey
help@rcsb.rutgers.edu