






                                            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 32.7 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        0.0961   -0.8611    0.2297    0.8664    -83.63
                        O1       0.1035   -0.9730    0.3261    0.9785    -83.93
                        O2      -0.0114   -0.7622    0.2535    0.7623    -90.86
                        O3       0.0844   -0.9186    0.0808    0.9225    -84.75
                        O5       0.2374   -0.7862    0.2236    0.8212    -73.20


            RIBOSE      C1       0.5009   -0.5503    0.0747    0.7441    -47.69
                        C2       0.5696   -0.5541    0.2108    0.7947    -44.21
                        C3       0.4944   -0.6677    0.2799    0.8308    -53.48
                        C4       0.4714   -0.7656    0.1648    0.8991    -58.38
                        C5       0.3536   -0.8596    0.1805    0.9295    -67.64
                        O4       0.4479   -0.6796    0.0496    0.8139    -56.61
                        O2       0.7047   -0.5900    0.1877    0.9191    -39.94


            URACIL      N1       0.3888   -0.4524    0.0669    0.5965    -49.32
                        C2       0.4219   -0.3214    0.0418    0.5304    -37.30
                        O2       0.5369   -0.2839    0.0262    0.6073    -27.87
                        N3       0.3156   -0.2336    0.0353    0.3926    -36.51
                        C4       0.1822   -0.2652    0.0514    0.3217    -55.51
                        O4       0.0956   -0.1777    0.0433    0.2018    -61.71
                        C5       0.1574   -0.4051    0.0773    0.4346    -68.76
                        C6       0.2591   -0.4926    0.0841    0.5566    -62.26


            PHOSPHATE   P        0.2729    0.8937   -0.1941    0.9344     73.02
                        O1       0.1481    0.8292   -0.2413    0.8423     79.87
                        O2       0.3225    1.0062   -0.2764    1.0566     72.23
                        O3       0.2543    0.9420   -0.0427    0.9757     74.89
                        O5       0.3880    0.7836   -0.1784    0.8744     63.66


            RIBOSE      C1       0.5815    0.4879   -0.0568    0.7591     40.00
                        C2       0.6645    0.4801   -0.1846    0.8198     35.85
                        C3       0.6264    0.6108   -0.2539    0.8749     44.28
                        C4       0.6137    0.7072   -0.1358    0.9364     49.05
                        C5       0.5237    0.8271   -0.1578    0.9789     57.66
                        O4       0.5576    0.6250   -0.0293    0.8376     48.26
                        O2       0.8006    0.4818   -0.1454    0.9344     31.04


            ADENINE     N1       0.3299    0.0443    0.0035    0.3329      7.64
                        C2       0.4573    0.0791    0.0212    0.4641      9.81
                        N3       0.5147    0.1960    0.0034    0.5508     20.85
                        C4       0.4249    0.2876   -0.0385    0.5131     34.09
                        C5       0.2918    0.2682   -0.0613    0.3963     42.59
                        C6       0.2413    0.1391   -0.0390    0.2785     29.97
                        N6       0.1126    0.1058   -0.0573    0.1545     43.23
                        N7       0.2321    0.3861   -0.1306    0.4505     58.99
                        C8       0.3295    0.4717   -0.1501    0.5754     55.07
                        N9       0.4496    0.4194   -0.0669    0.6148     43.01


            PHOSPHATE   P       -0.6972    0.5269   -0.4004    0.8739    142.92
                        O1      -0.7847    0.5809   -0.5069    0.9763    143.49
                        O2      -0.6584    0.3849   -0.4146    0.7626    149.69
                        O3      -0.7654    0.5500   -0.2576    0.9425    144.30
                        O5      -0.5658    0.6175   -0.3879    0.8375    132.50


            RIBOSE      C1      -0.2493    0.7577   -0.2324    0.7977    108.21
                        C2      -0.2087    0.8116   -0.3692    0.8380    104.42
                        C3      -0.3372    0.7916   -0.4494    0.8604    113.07
                        C4      -0.4449    0.8229   -0.3457    0.9355    118.40
                        C5      -0.5805    0.7596   -0.3699    0.9560    127.39
                        O4      -0.3902    0.7708   -0.2211    0.8639    116.85
                        O2      -0.1810    0.9495   -0.3525    0.9666    100.79


            URACIL      N1      -0.2145    0.6143   -0.2118    0.6507    109.25
                        C2      -0.0858    0.5862   -0.1727    0.5925     98.33
                        O2      -0.0016    0.6725   -0.1548    0.6725     90.14
                        N3      -0.0573    0.4523   -0.1546    0.4559     97.22
                        C4      -0.1446    0.3469   -0.1719    0.3758    112.63
                        O4      -0.1075    0.2309   -0.1527    0.2547    114.96
                        C5      -0.2773    0.3864   -0.2131    0.4756    125.67
                        C6      -0.3078    0.5159   -0.2314    0.6007    120.82


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