1 28 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 GGCUCGUGUA GCUCAUUAGC UCCGAGCC LOOP1 14 17 Crystallography ? ? Angstroms 1 G P 12.861 5.991 6.066 O3' 14.859 10.125 9.001 2 G P 14.833 11.016 7.673 O3' 18.196 12.412 4.247 3 C P 16.851 12.853 3.480 O3' 17.956 10.754 -1.695 4 U P 16.612 11.146 -2.449 O3' 16.376 6.884 -6.600 5 C P 14.892 6.501 -7.094 O3' 13.335 1.358 -9.264 6 G P 11.821 1.526 -9.429 O3' 8.440 -2.376 -9.081 7 U P 7.470 -3.593 -9.319 O3' 2.146 -4.270 -8.888 8 G P 2.811 -5.665 -9.213 O3' 1.969 -8.593 -3.808 9 U P 0.479 -9.141 -3.725 O3' -1.617 -9.572 1.593 10 A P -3.052 -8.921 1.583 O3' -3.160 -4.398 4.057 11 G P -4.268 -3.226 3.986 O3' -3.393 -0.313 8.903 12 C P -4.580 0.391 9.700 O3' -3.802 6.218 10.470 13 U P -4.826 7.435 10.446 O3' -4.266 12.794 8.070 14 C P -5.437 13.781 7.643 O3' -4.283 17.074 2.924 15 A P -4.721 18.369 2.198 O3' -0.629 16.020 -1.411 16 U P 0.311 17.211 -1.989 O3' -0.054 17.591 -7.623 17 U P 0.848 16.687 -8.596 O3' -0.181 11.102 -10.530 18 A P 1.129 10.543 -9.953 O3' 2.332 13.732 -5.700 19 G P 3.678 14.199 -5.006 O3' 5.820 12.815 0.280 20 C P 7.214 12.053 0.506 O3' 7.927 9.968 5.340 21 U P 9.088 9.394 6.239 O3' 9.485 3.551 7.013 22 C P 10.191 2.247 6.416 O3' 8.206 -3.162 7.636 23 C P 8.941 -4.530 7.227 O3' 9.944 -8.328 4.173 24 G P 11.219 -8.756 5.005 O3' 15.443 -8.285 0.982 25 A P 16.884 -7.744 1.388 O3' 19.938 -6.718 -3.304 26 G P 21.333 -7.358 -3.029 O3' 24.974 -3.621 -0.522 27 C P 25.524 -3.865 0.967 O3' 28.284 0.207 3.272 28 C P 28.027 0.314 4.873 O3' 28.220 5.073 8.486 14 syn 1 28 W W c 2 27 + + c 3 26 + + c 4 25 - - c 5 24 + + c 6 23 + + c 7 10 W H c 8 22 + + c 10 21 - - c 11 20 + + c 12 19 + + c 13 18 - - c 14 18 W W c 1 28 6 10 21 4 SG1 7 9 SG2 14 17 SG3 22 22 1 92.980 0.000 2 92.980 36.675 3 92.980 73.350 4 92.980 110.026 5 92.980 146.701 6 92.980 183.376 7 92.980 220.051 8 92.980 293.401 9 92.980 330.077 10 92.980 366.752 11 92.980 403.427 12 92.980 440.102 13 92.980 476.777 14 97.940 518.550 15 70.003 550.000 16 27.937 550.000 17 0.000 518.550 18 4.960 476.777 19 4.960 440.102 20 4.960 403.427 21 4.960 366.752 22 4.960 256.726 23 4.960 183.376 24 4.960 146.701 25 4.960 110.026 26 4.960 73.350 27 4.960 36.675 28 4.960 0.000