






                                            TABLE








                 Cartesian and cylindrical polar coordinates of atoms in a            

              base-triplet in the A'-form of poly (U). poly (A). poly(U)              

              triple-helix.  Successive base-triplets can be generated by             

              adding multiples of 30.0 degrees to phi and the same multiple           

              of 0.304 nm to z.                                                       
1




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


            PHOSPHATE   P        0.1504   -0.8592    0.2427    0.8723    -80.07
                        O1       0.1446   -0.9678    0.3432    0.9785    -81.50
                        O2       0.0453   -0.7556    0.2534    0.7570    -86.57
                        O3       0.1493   -0.9220    0.0955    0.9340    -80.80
                        O5       0.2946   -0.7901    0.2465    0.8432    -69.55


            RIBOSE      C1       0.5620   -0.5329    0.0904    0.7745    -43.48
                        C2       0.6144   -0.5435    0.2332    0.8203    -41.50
                        C3       0.5306   -0.6588    0.2882    0.8459    -51.15
                        C4       0.5201   -0.7514    0.1670    0.9139    -55.31
                        C5       0.4003   -0.8442    0.1649    0.9343    -64.63
                        O4       0.5110   -0.6602    0.0537    0.8349    -52.26
                        O2       0.7510   -0.5804    0.2244    0.9491    -37.70


            URACIL      N1       0.4526   -0.4332    0.0740    0.6265    -43.74
                        C2       0.4898   -0.3030    0.0504    0.5759    -31.74
                        O2       0.6063   -0.2676    0.0427    0.6627    -23.82
                        N3       0.3859   -0.2133    0.0357    0.4409    -28.93
                        C4       0.2511   -0.2423    0.0425    0.3490    -43.98
                        O4       0.1670   -0.1534    0.0278    0.2267    -42.57
                        C5       0.2220   -0.3815    0.0676    0.4414    -59.81
                        C6       0.3212   -0.4709    0.0823    0.5700    -55.70


            PHOSPHATE   P        0.3426    0.9207   -0.2036    0.9824     69.59
                        O1       0.2155    0.8604   -0.2495    0.8870     75.94
                        O2       0.3966    1.0295   -0.2881    1.1033     68.93
                        O3       0.3259    0.9730   -0.0532    1.0261     71.48
                        O5       0.4532    0.8066   -0.1854    0.9252     60.67


            RIBOSE      C1       0.6412    0.4979   -0.0683    0.8118     37.83
                        C2       0.7157    0.4963   -0.2013    0.8710     34.74
                        C3       0.6769    0.6319   -0.2600    0.9260     43.03
                        C4       0.6741    0.7209   -0.1357    0.9870     46.92
                        C5       0.5861    0.8439   -0.1445    1.0275     55.22
                        O4       0.6227    0.6337   -0.0310    0.8884     45.50
                        O2       0.8542    0.4926   -0.1709    0.9860     29.97


            ADENINE     N1       0.3808    0.0596   -0.0072    0.3854      8.90
                        C2       0.5096    0.0907    0.0055    0.5176     10.09
                        N3       0.5693    0.2065   -0.0120    0.6056     19.94
                        C4       0.4803    0.3014   -0.0477    0.5670     32.11
                        C5       0.3457    0.2860   -0.0649    0.4487     39.60
                        C6       0.2927    0.1577   -0.0435    0.3325     28.32
                        N6       0.1626    0.1283   -0.0567    0.2071     38.28
                        N7       0.2874    0.4064   -0.1017    0.4978     54.73
                        C8       0.3869    0.4896   -0.1056    0.6240     51.68
                        N9       0.5071    0.4331   -0.0740    0.6669     40.50


            PHOSPHATE   P       -0.6114    0.6698   -0.3767    0.9069    132.39
                        O1      -0.7002    0.7271   -0.4803    1.0094    133.92
                        O2      -0.5919    0.5233   -0.3821    0.7900    138.52
                        O3      -0.6636    0.7119   -0.2314    0.9732    132.99
                        O5      -0.4692    0.7431   -0.3815    0.8788    122.27


            RIBOSE      C1      -0.1235    0.8109   -0.2117    0.8203     98.66
                        C2      -0.0829    0.8574   -0.3512    0.8614     95.52
                        C3      -0.2179    0.8622   -0.4225    0.8893    104.18
                        C4      -0.3108    0.9124   -0.3118    0.9639    108.81
                        C5      -0.4570    0.8756   -0.3265    0.9877    117.56
                        O4      -0.2584    0.8499   -0.1910    0.8883    106.91
                        O2      -0.0288    0.9876   -0.3371    0.9880     91.67


            URACIL      N1      -0.1148    0.6634   -0.1927    0.6733     99.82
                        C2       0.0078    0.6120   -0.1582    0.6120     89.27
                        O2       0.1068    0.6813   -0.1429    0.6896     81.09
                        N3       0.0120    0.4749   -0.1415    0.4751     88.55
                        C4      -0.0936    0.3873   -0.1562    0.3985    103.59
                        O4      -0.0777    0.2664   -0.1386    0.2775    106.25
                        C5      -0.2182    0.4508   -0.1925    0.5008    115.83
                        C6      -0.2945    0.5520   -0.2094    0.6257    118.08


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