






                                            TABLE








                 Cartesian and cylindrical polar coordinates of atoms in a            

              base-pair in the poly d(I). poly (C) duplex.  Successive base-          

              pairs can be generated by adding multiples of 36.0 degrees to           

              phi and the same multiple of 0.313 nm to z.                             
1




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


            PHOSPHATE   P        0.1928    0.9763   -0.0931    0.9952     78.83
                        O1       0.2646    1.1057   -0.0973    1.1369     76.54
                        O2       0.0804    0.9612   -0.1882    0.9646     85.22
                        O3       0.1414    0.9482    0.0557    0.9587     81.52
                        O5       0.2970    0.8566   -0.1138    0.9066     70.88


            SUGAR       C1       0.4465    0.5232   -0.1314    0.6878     49.52
                        C2       0.4504    0.5923   -0.2673    0.7441     52.75
                        C3       0.5347    0.7165   -0.2384    0.8940     53.27
                        C4       0.5105    0.7447   -0.0901    0.9029     55.57
                        C5       0.4295    0.8691   -0.0589    0.9694     63.70
                        O4       0.4391    0.6292   -0.0374    0.7673     55.09
                        H1       0.5384    0.4642   -0.1175    0.7109     40.77
                        H12      0.5036    0.5277   -0.3388    0.7294     46.34
                        H22      0.3485    0.6227   -0.2950    0.7136     60.77
                        H3       0.5097    0.8060   -0.2973    0.9536     57.69
                        H4       0.6070    0.7496   -0.0375    0.9646     51.00
                        H15      0.4791    0.9571   -0.1025    1.0703     63.41
                        H25      0.4231    0.8822    0.0501    0.9784     64.38


            INOSINE     N1       0.2963    0.0578   -0.0137    0.3019     11.04
                        C2       0.4207    0.1116   -0.0235    0.4353     14.86
                        N3       0.4460    0.2356   -0.0554    0.5044     27.84
                        C4       0.3334    0.3061   -0.0781    0.4526     42.55
                        C5       0.2045    0.2625   -0.0712    0.3327     52.08
                        C6       0.1770    0.1259   -0.0361    0.2172     35.44
                        O6       0.0688    0.0694   -0.0250    0.0977     45.26
                        N7       0.1171    0.3646   -0.1014    0.3830     72.19
                        C8       0.1973    0.4684   -0.1259    0.5083     67.16
                        N9       0.3278    0.4352   -0.1124    0.5448     53.01
                        H1       0.2899   -0.0387    0.0116    0.2925     -7.61
                        H2       0.4986    0.0518   -0.0048    0.5013      5.93
                        H8       0.1650    0.5596   -0.1512    0.5834     73.57


            PHOSPHATE   P        0.1043   -0.8585    0.2349    0.8648    -83.07
                        O1       0.1298   -0.9779    0.3185    0.9865    -82.44
                        O2      -0.0103   -0.7740    0.2754    0.7741    -90.76
                        O3       0.0871   -0.9026    0.0820    0.9068    -84.49
                        O5       0.2369   -0.7690    0.2272    0.8047    -72.88


            RIBOSE      C1       0.4721   -0.5214    0.0924    0.7034    -47.84
                        C2       0.5576   -0.5131    0.2184    0.7577    -42.62
                        C3       0.5059   -0.6308    0.3010    0.8086    -51.27
                        C4       0.4741   -0.7348    0.1935    0.8745    -57.17
                        C5       0.3652   -0.8343    0.2281    0.9107    -66.36
                        O4       0.4293   -0.6561    0.0793    0.7841    -56.80
                        O2       0.6933   -0.5324    0.1825    0.8741    -37.52
                        H1       0.5333   -0.4954    0.0048    0.7279    -42.89
                        H2       0.5352   -0.4189    0.2709    0.6797    -38.05
                        H3       0.4135   -0.6027    0.3534    0.7309    -55.55
                        H4       0.5661   -0.7889    0.1665    0.9710    -54.34
                        H15      0.3654   -0.9160    0.1544    0.9862    -68.25
                        H25      0.3843   -0.8763    0.3279    0.9569    -66.32


            CYTOSINE    N1       0.3512   -0.4344    0.0961    0.5586    -51.05
                        C2       0.3656   -0.3017    0.0567    0.4740    -39.53
                        O2       0.4769   -0.2619    0.0206    0.5441    -28.77
                        N3       0.2566   -0.2207    0.0594    0.3384    -40.70
                        C4       0.1376   -0.2677    0.0991    0.3010    -62.79
                        N4       0.0345   -0.1848    0.0999    0.1880    -79.44
                        C5       0.1207   -0.4039    0.1400    0.4216    -73.36
                        C6       0.2309   -0.4832    0.1366    0.5355    -64.46
                        H14      0.0464   -0.0897    0.0713    0.1010    -62.63
                        H24     -0.0555   -0.2172    0.1292    0.2242   -104.34
                        H5       0.0319   -0.4390    0.1697    0.4402    -85.84
                        H6       0.2235   -0.5790    0.1644    0.6206    -68.89


            --------------------------------------------------------------------
