






                                            TABLE








                 Cartesian and cylindrical polar coordinates of atoms in a            

              base-pair of the A-form of poly (A). poly (U).  Successive              

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

              to phi and the same multiple of 0.2812 nm to z.                         
1




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


            PHOSPHATE   P        0.2893    0.8538   -0.3328    0.9015     71.28
                        O1       0.1698    0.7696   -0.3557    0.7882     77.56
                        O2       0.3226    0.9501   -0.4402    1.0034     71.25
                        O3       0.2743    0.9315   -0.1938    0.9711     73.59
                        O5       0.4159    0.7604   -0.3034    0.8667     61.33


            RIBOSE      C1       0.6540    0.5120   -0.1419    0.8306     38.06
                        C2       0.7194    0.4883   -0.2777    0.8695     34.17
                        C3       0.6572    0.6004   -0.3609    0.8901     42.41
                        C4       0.6497    0.7148   -0.2598    0.9659     47.73
                        C5       0.5455    0.8212   -0.2881    0.9859     56.41
                        O4       0.6163    0.6486   -0.1344    0.8947     46.46
                        O2       0.8586    0.5091   -0.2614    0.9982     30.67
                        H1       0.7263    0.4922   -0.0628    0.8773     34.12
                        H2       0.6877    0.3918   -0.3172    0.7915     29.67
                        H3       0.5565    0.5728   -0.3922    0.7986     45.83
                        H4       0.7477    0.7615   -0.2504    1.0672     45.53
                        H15      0.5717    0.8743   -0.3797    1.0446     56.82
                        H25      0.5428    0.8924   -0.2056    1.0445     58.69


            ADENINE     N1       0.4715    0.0491   -0.0136    0.4741      5.94
                        C2       0.5953    0.0965   -0.0267    0.6031      9.21
                        N3       0.6349    0.2173   -0.0602    0.6711     18.90
                        C4       0.5290    0.2979   -0.0826    0.6072     29.38
                        C5       0.3972    0.2639   -0.0733    0.4769     33.60
                        C6       0.3677    0.1316   -0.0366    0.3905     19.69
                        N6       0.2428    0.0845   -0.0236    0.2571     19.18
                        N7       0.3166    0.3729   -0.1036    0.4892     49.66
                        C8       0.4010    0.4678   -0.1299    0.6161     49.40
                        N9       0.5317    0.4299   -0.1193    0.6838     38.96
                        H2       0.6685    0.0309   -0.0084    0.6693      2.65
                        H16      0.1647    0.1446   -0.0404    0.2192     41.29
                        H26      0.2278   -0.0108    0.0028    0.2281     -2.71
                        H8       0.3728    0.5603   -0.1556    0.6730     56.36


            PHOSPHATE   P        0.2676   -0.8496    0.3288    0.8907    -72.52
                        O1       0.1495   -0.7623    0.3477    0.7769    -78.90
                        O2       0.2949   -0.9464    0.4374    0.9913    -72.70
                        O3       0.2552   -0.9272    0.1895    0.9617    -74.61
                        O5       0.3973   -0.7595    0.3034    0.8571    -62.38


            RIBOSE      C1       0.6419   -0.5184    0.1362    0.8251    -38.92
                        C2       0.7060   -0.4956    0.2727    0.8626    -35.07
                        C3       0.6406   -0.6059    0.3558    0.8817    -43.40
                        C4       0.6314   -0.7206    0.2551    0.9580    -48.77
                        C5       0.5243   -0.8242    0.2826    0.9768    -57.54
                        O4       0.6014   -0.6542    0.1289    0.8886    -47.41
                        O2       0.8450   -0.5193    0.2581    0.9918    -31.57
                        H1       0.7137   -0.4990    0.0565    0.8708    -34.96
                        H2       0.6759   -0.3982    0.3113    0.7845    -30.51
                        H3       0.5400   -0.5767    0.3860    0.7901    -46.88
                        H4       0.7287   -0.7689    0.2460    1.0593    -46.54
                        H15      0.5510   -0.8813    0.3715    1.0394    -57.99
                        H25      0.5169   -0.8923    0.1978    1.0312    -59.91


            URACIL      N1       0.5217   -0.4326    0.1169    0.6777    -39.67
                        C2       0.5433   -0.3020    0.0799    0.6216    -29.07
                        O2       0.6547   -0.2556    0.0629    0.7029    -21.32
                        N3       0.4296   -0.2256    0.0629    0.4852    -27.70
                        C4       0.2993   -0.2678    0.0794    0.4016    -41.83
                        O4       0.2054   -0.1900    0.0613    0.2798    -42.78
                        C5       0.2867   -0.4063    0.1183    0.4973    -54.80
                        C6       0.3957   -0.4830    0.1355    0.6243    -50.68
                        H3       0.4430   -0.1302    0.0360    0.4617    -16.38
                        H5       0.1959   -0.4457    0.1325    0.4868    -66.28
                        H6       0.3846   -0.5786    0.1624    0.6948    -56.39


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