1 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 GGCAGUGUGA GUACCUUCAC ACGUC LOOP1 11 16 Crystallography ? ? Angstroms 1 G O3' 5.602 16.568 7.298 2 G P 4.259 15.749 6.953 O3' -0.442 17.736 5.384 3 C P -1.250 16.349 5.249 O3' -3.368 14.949 0.696 4 A P -3.900 13.518 1.211 O3' -4.914 10.300 -3.331 5 G P -4.927 8.688 -3.324 O3' -3.450 6.766 -8.367 6 U P -3.736 5.195 -8.573 O3' 0.184 1.762 -9.570 7 G P -0.371 0.252 -9.673 O3' 1.924 -3.961 -8.386 8 U P 0.651 -4.937 -8.227 O3' 1.662 -8.848 -4.487 9 G P 0.539 -9.990 -4.299 O3' -0.396 -12.452 -0.004 10 A P -1.872 -13.032 -0.293 O3' -5.161 -13.363 3.940 11 G P -6.437 -14.059 3.244 O3' -10.986 -11.158 2.791 12 U P -12.053 -11.789 1.760 O3' -12.567 -9.176 -3.278 13 A P -14.057 -8.710 -2.875 O3' -13.339 -2.946 -1.724 14 C P -14.623 -1.974 -1.633 O3' -12.987 2.425 -4.438 15 C P -14.119 3.518 -4.778 O3' -15.992 3.476 0.399 16 U P -15.374 2.580 1.585 O3' -10.548 2.489 3.835 17 U P -8.978 2.691 3.531 O3' -6.705 1.627 8.369 18 C P -5.342 2.482 8.297 O3' -1.138 0.115 10.293 19 A P -0.110 1.332 10.060 O3' 5.014 -0.451 8.772 20 C P 5.838 0.905 8.489 O3' 9.734 -0.142 5.127 21 A P 10.451 1.298 5.043 O3' 12.178 3.159 0.548 22 C P 12.434 4.744 0.685 O3' 11.899 8.075 -2.928 23 G P 12.173 9.510 -2.247 O3' 11.206 13.520 -5.901 24 U P 12.146 14.731 -5.409 O3' 10.679 19.343 -3.810 25 C P 12.148 19.880 -3.420 O3' 13.585 23.058 0.311 3 23 + + c 5 22 + + c 6 21 - - c 7 20 + + c 8 19 - - c 9 18 + + c 10 17 - - c 1 24 ! ! ! 12 13 ! ! ! 14 15 ! ! ! 5 22 6 SG1 1 4 SG2 11 16 SG3 23 25 1 22.529 0.000 2 22.529 32.974 3 22.529 65.949 4 22.529 98.923 5 22.529 131.897 6 22.529 186.854 7 22.529 241.811 8 22.529 296.769 9 22.529 351.726 10 22.529 406.683 11 0.000 459.420 12 14.435 514.922 13 59.804 550.000 14 117.152 550.000 15 162.520 514.922 16 176.955 459.420 17 154.426 406.683 18 154.426 351.726 19 154.426 296.769 20 154.426 241.811 21 154.426 186.854 22 154.426 131.897 23 154.426 98.923 24 154.426 65.949 25 154.426 32.974