






                                            TABLE








                 Cartesian and cylindrical polar coordinates of atoms in a            

              base-pair in the poly (s2U). poly (s2U) duplex.  Successive             

              base-pairs can be generated by adding multiples of 32.7 degrees         

              to phi and the same multiple of 0.2596 nm to z.                         

                                                                                      

                   a) Model with symmetric base-pair                                  

                                                                                      

                   b) Model with asymmetric base-pair                                 
1




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             Group      Atom      x(nm)     y(nm)     z(nm)     r(nm)   phi(deg)
            --------------------------------------------------------------------


            PHOSPHATE   P        0.3396    0.7849   -0.3708    0.8552     66.60
                        O1       0.2154    0.7048   -0.3764    0.7370     73.01
                        O2       0.3626    0.8774   -0.4839    0.9494     67.55
                        O3       0.3452    0.8660   -0.2330    0.9323     68.27
                        O5       0.4656    0.6874   -0.3550    0.8302     55.89


            RIBOSE      C1       0.6896    0.4302   -0.1509    0.8128     31.96
                        C2       0.7539    0.4046   -0.2868    0.8556     28.22
                        C3       0.6877    0.5117   -0.3733    0.8572     36.65
                        C4       0.6870    0.6295   -0.2758    0.9318     42.50
                        C5       0.5907    0.7418   -0.3086    0.9482     51.47
                        O4       0.6515    0.5669   -0.1491    0.8636     41.03
                        O2       0.8924    0.4302   -0.2722    0.9907     25.74
                        H1       0.7637    0.4129   -0.0714    0.8682     28.40
                        H2       0.7244    0.3050   -0.3229    0.7860     22.83
                        H3       0.5842    0.4840   -0.3981    0.7586     39.64
                        H4       0.7888    0.6701   -0.2666    1.0350     40.35
                        H15      0.6341    0.8057   -0.3869    1.0253     51.80
                        H25      0.5731    0.8025   -0.2186    0.9861     54.47


            URACIL      N1       0.5688    0.3470   -0.1252    0.6663     31.39
                        C2       0.5893    0.2203   -0.0763    0.6291     20.50
                        S2       0.7415    0.1580   -0.0456    0.7582     12.03
                        N3       0.4750    0.1462   -0.0536    0.4970     17.11
                        C4       0.3450    0.1874   -0.0753    0.3926     28.51
                        O4       0.2505    0.1120   -0.0512    0.2744     24.08
                        C5       0.3337    0.3219   -0.1267    0.4636     43.97
                        C6       0.4432    0.3961   -0.1496    0.5944     41.79
                        H5       0.2432    0.3601   -0.1454    0.4345     55.97
                        H6       0.4329    0.4890   -0.1852    0.6531     48.48


            PHOSPHATE   P        0.3524   -0.7788    0.3676    0.8548    -65.65
                        O1       0.2280   -0.6985    0.3703    0.7348    -71.92
                        O2       0.3744   -0.8685    0.4832    0.9458    -66.68
                        O3       0.3587   -0.8635    0.2320    0.9350    -67.44
                        O5       0.4785   -0.6819    0.3502    0.8330    -54.94


            RIBOSE      C1       0.6973   -0.4260    0.1500    0.8171    -31.42
                        C2       0.7624   -0.3981    0.2850    0.8601    -27.57
                        C3       0.6980   -0.5068    0.3709    0.8626    -35.98
                        C4       0.7016   -0.6256    0.2746    0.9400    -41.72
                        C5       0.6030   -0.7370    0.3035    0.9523    -50.71
                        O4       0.6663   -0.5645    0.1470    0.8733    -40.27
                        O2       0.9014   -0.4211    0.2693    0.9949    -25.04
                        H1       0.7703   -0.4083    0.0697    0.8718    -27.93
                        H2       0.7312   -0.2990    0.3211    0.7900    -22.24
                        H3       0.5940   -0.4790    0.3933    0.7631    -38.88
                        H4       0.8036   -0.6667    0.2709    1.0441    -39.68
                        H15      0.6447   -0.8038    0.3804    1.0304    -51.27
                        H25      0.5854   -0.7952    0.2118    0.9874    -53.64


            URACIL      N1       0.5749   -0.3449    0.1247    0.6704    -30.96
                        C2       0.5932   -0.2178    0.0758    0.6319    -20.16
                        S2       0.7442   -0.1530    0.0445    0.7598    -11.62
                        N3       0.4776   -0.1456    0.0535    0.4993    -16.96
                        C4       0.3485   -0.1890    0.0756    0.3964    -28.47
                        O4       0.2526   -0.1151    0.0519    0.2776    -24.50
                        C5       0.3395   -0.3236    0.1270    0.4690    -43.63
                        C6       0.4503   -0.3960    0.1496    0.5996    -41.33
                        H5       0.2497   -0.3634    0.1461    0.4409    -55.51
                        H6       0.4416   -0.4891    0.1852    0.6590    -47.92


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