






                                            TABLE








                 Cartesian and cylindrical polar coordinates of atoms in a            

              nucleotide in poly (X). poly (X) form I double-helix.  The              

              coordinates of the diadically related nucleotide in the                 

              antiparallel chain are given by r, -phi, -z.  Successive                

              nucleotides can be generated by adding multiples of 36.0                

              degrees to phi and the same multiple of 0.301 nm to z.                  
1




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


            PHOSPHATE   P        0.0182    0.8335   -0.3861    0.8337     88.75
                        O1      -0.0763    0.7211   -0.4039    0.7251     96.04
                        O2       0.0147    0.9385   -0.4903    0.9386     89.10
                        O3      -0.0039    0.9000   -0.2422    0.9000     90.25
                        O5       0.1672    0.7766   -0.3720    0.7944     77.85


            RIBOSE      C1       0.4491    0.6058   -0.2108    0.7541     53.45
                        C2       0.5272    0.5911   -0.3410    0.7921     48.27
                        C3       0.4486    0.6835   -0.4338    0.8176     56.72
                        C4       0.4065    0.7974   -0.3409    0.8950     62.99
                        C5       0.2779    0.8685   -0.3779    0.9119     72.26
                        O4       0.3868    0.7333   -0.2115    0.8290     62.19
                        O2       0.6572    0.6424   -0.3173    0.9190     44.35
                        H1       0.5179    0.6019   -0.1264    0.7941     49.29
                        H2       0.5196    0.4884   -0.3768    0.7131     43.23
                        H3       0.3600    0.6322   -0.4710    0.7275     60.34
                        H4       0.4873    0.8701   -0.3334    0.9972     60.75
                        H15      0.2864    0.9088   -0.4789    0.9528     72.51
                        H25      0.2605    0.9509   -0.3085    0.9859     74.68


            XANTHINE    N1       0.3489    0.1327   -0.0506    0.3733     20.82
                        C2       0.4685    0.2018   -0.0530    0.5101     23.31
                        O2       0.5709    0.1388   -0.0086    0.5875     13.67
                        N3       0.4799    0.3265   -0.0983    0.5804     34.23
                        C4       0.3610    0.3767   -0.1411    0.5218     46.22
                        C5       0.2378    0.3157   -0.1425    0.3953     53.01
                        C6       0.2256    0.1829   -0.0944    0.2904     39.04
                        O6       0.1207    0.1094   -0.0873    0.1629     42.17
                        N7       0.1412    0.4017   -0.1946    0.4258     70.63
                        C8       0.2083    0.5107   -0.2227    0.5516     67.81
                        N9       0.3427    0.5031   -0.1930    0.6087     55.74
                        H8       0.1659    0.5922   -0.2622    0.6150     74.35


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