






                                            TABLE








                 Cartesian and cylindrical polar coordinates of atoms in a            

              nucleotide in poly (X). poly (X) form II 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 32.7                

              degrees to phi and the same multiple of 0.2518 nm to z.                 
1




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


            PHOSPHATE   P        0.2118    0.8763   -0.4297    0.9015     76.41
                        O1       0.1055    0.7744   -0.4454    0.7816     82.24
                        O2       0.2335    0.9659   -0.5454    0.9937     76.41
                        O3       0.1833    0.9636   -0.2987    0.9809     79.23
                        O5       0.3495    0.8047   -0.3907    0.8773     66.52


            RIBOSE      C1       0.6227    0.6076   -0.2047    0.8700     44.30
                        C2       0.6902    0.5843   -0.3395    0.9043     40.25
                        C3       0.6084    0.6759   -0.4303    0.9094     48.01
                        C4       0.5860    0.7969   -0.3395    0.9892     53.67
                        C5       0.4678    0.8851   -0.3747    1.0011     62.14
                        O4       0.5653    0.7375   -0.2080    0.9292     52.53
                        O2       0.8234    0.6312   -0.3277    1.0375     37.47
                        H1       0.6975    0.6048   -0.1256    0.9232     40.93
                        H2       0.6761    0.4808   -0.3701    0.8296     35.42
                        H3       0.5122    0.6303   -0.4543    0.8122     50.90
                        H4       0.6768    0.8573   -0.3363    1.0922     51.71
                        H15      0.4886    0.9382   -0.4676    1.0578     62.49
                        H25      0.4519    0.9578   -0.2951    1.0591     64.74


            XANTHINE    N1       0.5208    0.1344   -0.0459    0.5379     14.47
                        C2       0.6424    0.1974   -0.0641    0.6720     17.08
                        O2       0.7465    0.1276   -0.0374    0.7573      9.70
                        N3       0.6539    0.3229   -0.1067    0.7293     26.28
                        C4       0.5331    0.3808   -0.1297    0.6552     35.54
                        C5       0.4078    0.3263   -0.1145    0.5223     38.66
                        C6       0.3953    0.1925   -0.0692    0.4397     25.96
                        O6       0.2887    0.1242   -0.0488    0.3143     23.27
                        N7       0.3096    0.4190   -0.1489    0.5210     53.54
                        C8       0.3778    0.5255   -0.1834    0.6472     54.29
                        N9       0.5145    0.5098   -0.1743    0.7243     44.74
                        H8       0.3347    0.6105   -0.2136    0.6962     61.27


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