• Please enter PDB-ID code of the DNA/RNA molecule:

  • Alternatively, you can upload a PDB file: 

  • Define the Y-axis line as:    C6-C8  C1' - C1'

  • Reorient the molecule about a 'Linear Global Axis' fitted to:                     
    •                                                     Local HELIX ORIGINS
                                                        Base-Pair CENTERS
                                                        Other Backbone atom (Choose the atom type)
                                                        Not Required
  • Are P--P distances and Cylindrical Polar Coordinates required?
    • Yes No
    (Only meaningful if the molecule is reoriented ; P--P distance is need to calculate groove width)
  • Is the Backbone and Sugar torsion angle parameters required? Yes No

    •
  • Are Single Strand parameters required? Yes No