1 27 2 3 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 GGUGCUCAGU AUGAGAAGAA CCGCACC LOOP1 14 15 Crystallography ? ? Angstroms 1 G O3' -46.800 88.028 7.469 2 G P -46.265 87.202 6.193 O3' -48.959 85.500 2.342 3 U P -47.854 84.644 1.549 O3' -47.737 84.265 -3.499 4 G P -46.379 83.433 -3.706 O3' -43.843 84.370 -8.192 5 C P -42.419 83.631 -8.140 O3' -38.193 86.013 -10.484 6 U P -36.911 85.072 -10.268 O3' -32.262 87.606 -9.108 7 C P -31.093 86.510 -8.962 O3' -27.704 86.967 -4.773 8 A P -26.642 86.448 -5.866 O3' -28.633 82.014 -9.259 9 G P -28.482 82.113 -10.851 O3' -25.932 78.094 -8.286 10 U P -24.587 77.316 -7.908 O3' -21.681 80.200 -4.810 11 A P -21.000 79.052 -3.913 O3' -20.358 79.530 1.143 12 U P -19.487 78.186 1.276 O3' -21.012 74.351 4.242 13 G P -19.804 73.358 3.890 O3' -20.318 68.451 3.029 14 A P -18.757 68.282 2.683 O3' -18.583 67.029 -2.545 15 G P -19.820 67.832 -3.178 O3' -23.171 64.954 -6.220 16 A P -24.378 65.859 -6.772 O3' -29.341 64.219 -6.796 17 A P -30.095 65.490 -7.418 O3' -32.831 68.652 -3.421 18 G P -33.726 69.959 -3.675 O3' -33.264 74.338 -1.263 19 A P -33.996 75.519 -2.077 O3' -34.588 79.057 1.627 20 A P -35.348 80.437 1.334 O3' -34.886 83.880 5.383 21 C P -35.605 85.267 5.018 O3' -33.817 89.794 6.491 22 C P -34.802 90.771 5.676 O3' -32.850 95.042 3.504 23 G P -34.161 95.715 2.865 O3' -34.096 97.635 -1.926 24 C P -35.495 98.410 -1.957 O3' -38.528 98.861 -5.875 25 A P -39.891 99.476 -5.280 O3' -44.271 98.948 -7.858 26 C P -45.199 99.919 -6.974 O3' -50.120 98.297 -6.351 27 C P -50.840 99.169 -5.213 O3' -54.331 97.453 -1.938 1 27 + + c 2 26 + + c 3 25 - - c 4 24 + + c 5 23 + + c 7 21 S H t 8 20 H H t 9 10 S H c 10 19 W H t 11 18 H S t 12 17 - - c 13 16 S H t 6 22 ! ! ! 9 19 ! ! ! 1 27 8 10 19 4 SG1 9 9 SG2 14 15 1 0.000 0.000 2 0.000 41.109 3 0.000 82.218 4 0.000 123.327 5 0.000 164.435 6 0.000 205.544 7 0.000 246.653 8 0.000 287.762 9 0.000 328.871 10 0.000 369.980 11 0.000 411.089 12 0.000 452.197 13 0.000 493.306 14 19.374 550.000 15 79.287 550.000 16 98.661 493.306 17 98.661 452.197 18 98.661 411.089 19 98.661 369.980 20 98.661 287.762 21 98.661 246.653 22 98.661 205.544 23 98.661 164.435 24 98.661 123.327 25 98.661 82.218 26 98.661 41.109 27 98.661 0.000