1 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 GAGGACCUAG AUCACCCCUC LOOP1 6 15 Crystallography ? ? Angstroms 1 G O3' 105.937 60.285 -50.711 2 A P 107.503 60.181 -51.066 O3' 109.591 62.062 -55.249 3 G P 111.177 61.973 -55.238 O3' 115.223 65.931 -56.347 4 G P 116.497 65.166 -55.750 O3' 119.880 68.692 -53.778 5 A P 121.256 68.091 -53.207 O3' 123.678 70.472 -49.380 6 C P 125.045 69.636 -49.358 O3' 126.757 68.384 -44.939 7 C P 128.148 67.762 -45.447 O3' 130.866 62.810 -45.099 8 U P 131.709 61.441 -44.899 O3' 131.756 57.315 -47.099 9 A P 133.285 57.096 -47.564 O3' 132.382 53.651 -51.364 10 G P 130.798 53.415 -51.275 O3' 128.190 48.490 -50.028 11 A P 126.776 49.242 -50.076 O3' 124.411 50.519 -45.470 12 U P 124.505 52.112 -45.630 O3' 119.868 54.149 -46.235 13 C P 118.648 54.346 -47.292 O3' 116.936 59.336 -44.764 14 A P 115.916 60.100 -45.731 O3' 111.295 59.874 -43.191 15 C P 110.931 61.444 -43.211 O3' 110.174 64.080 -38.799 16 C P 109.923 65.512 -39.472 O3' 111.947 69.862 -37.883 17 C P 111.237 70.827 -38.952 O3' 113.547 74.402 -41.400 18 C P 112.405 74.913 -42.404 O3' 113.038 77.196 -46.888 19 U P 111.531 77.503 -47.376 O3' 109.797 77.286 -52.147 20 C P 108.272 77.672 -51.891 O3' 104.025 75.742 -54.153 11 syn 1 20 + + c 2 19 - - c 3 18 + + c 4 17 + + c 5 16 ! ! ! 8 10 ! ! ! 13 14 ! ! ! 1 20 5 SG1 6 15 1 66.801 0.000 2 66.801 69.574 3 66.801 139.147 4 66.801 208.721 5 66.801 278.294 6 19.562 328.936 7 0.000 395.371 8 12.257 463.532 9 53.739 518.989 10 115.662 550.000 11 184.917 550.000 12 246.840 518.989 13 288.322 463.532 14 300.579 395.371 15 281.017 328.936 16 233.778 278.294 17 233.778 208.721 18 233.778 139.147 19 233.778 69.574 20 233.778 0.000