1 22 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 GGAUCGCAUU UGGACUUCUG CC Crystallography ? ? Angstroms 1 G O3' 12.367 -1.742 26.411 2 G P 11.718 -1.226 27.769 O3' 12.366 -2.477 32.292 3 A P 11.564 -1.627 33.375 O3' 12.697 0.045 37.982 4 U P 11.398 0.899 38.343 O3' 11.750 5.299 40.924 5 C P 10.266 5.915 40.835 O3' 9.518 10.906 41.233 6 G P 7.972 10.651 41.546 O3' 4.670 14.357 39.156 7 C P 5.595 15.576 39.636 O3' 8.590 18.486 35.876 8 A P 8.587 19.998 36.367 O3' 2.886 21.587 36.655 9 U P 3.265 23.145 36.787 O3' 0.754 21.583 41.132 10 U P 0.422 20.189 41.867 O3' -4.136 17.129 39.703 11 U P -4.986 18.037 38.681 O3' -4.873 15.484 32.957 12 G P -5.165 16.440 31.694 O3' -0.659 20.314 31.387 13 G P -0.330 21.565 30.457 O3' 0.792 19.676 26.507 14 A P -0.639 18.992 26.703 O3' -2.210 16.013 22.665 15 C P -3.632 15.402 23.093 O3' -5.254 10.761 21.111 16 U P -6.779 11.099 21.457 O3' -8.608 7.164 25.519 17 U P -9.955 6.266 25.491 O3' -8.268 0.693 27.205 18 C P -8.103 -0.306 25.926 O3' -2.336 -0.212 25.458 19 U P -2.185 -1.565 26.294 O3' 0.587 -2.776 31.138 20 G P 1.140 -4.241 31.043 O3' 2.245 -6.507 35.711 21 C P 2.732 -7.997 35.369 O3' 1.630 -12.137 38.347 22 C P 2.333 -13.317 37.497 O3' -0.391 -17.993 37.465 8 syn 12 syn 18 syn 6 13 W H c 16 18 S H c 10 11 ! ! ! SG1 1 1 SG2 6 12 SG3 16 18 1 523.678 0.000 2 523.678 14.269 3 523.678 38.052 4 523.678 61.834 5 523.678 85.616 6 523.678 109.399 7 523.678 156.964 8 523.678 180.746 9 523.678 204.528 10 523.678 228.311 11 523.678 252.093 12 523.678 275.875 13 523.678 299.658 14 523.678 323.440 15 523.678 347.222 16 523.678 361.492 17 523.678 375.761 18 523.678 390.031 19 95.638 517.541 20 82.114 497.979 21 68.589 478.416 22 55.064 458.854 1 18 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 CGGCACCA CGGUCGGAUC Crystallography ? ? Angstroms 1 C O3' -10.044 -14.400 23.790 2 G P -10.781 -13.455 24.858 O3' -12.278 -15.914 29.187 3 G P -13.028 -14.715 29.947 O3' -12.806 -14.765 35.255 4 C P -13.625 -13.434 35.591 O3' -11.921 -10.745 39.611 5 A P -12.722 -9.363 39.471 O3' -10.374 -5.000 41.206 6 C P -11.592 -3.988 40.963 O3' -10.417 0.576 39.596 7 C P -10.425 2.167 39.594 O3' -9.100 6.888 38.783 8 A P -9.095 7.925 40.014 O3' -3.509 6.499 41.539 9 C P -2.901 7.541 42.628 O3' 0.104 8.088 38.087 10 G P 1.252 7.711 37.051 O3' 2.083 3.219 35.497 11 G P 3.036 3.605 34.293 O3' 3.633 1.516 29.687 12 U P 4.883 2.288 29.094 O3' 5.692 4.234 25.408 13 C P 7.116 4.716 24.840 O3' 8.254 8.815 21.711 14 G P 9.727 9.023 22.265 O3' 11.182 13.677 23.291 15 G P 12.621 13.334 23.886 O3' 14.881 15.964 27.383 16 A P 16.342 15.318 27.563 O3' 18.830 15.300 32.263 17 U P 20.244 14.668 31.876 O3' 22.485 11.878 36.300 18 C P 23.710 11.273 35.422 O3' 24.827 6.156 37.336 9 10 ! ! ! SG1 1 1 SG2 6 10 SG3 14 14 1 0.000 479.576 2 8.115 491.313 3 21.639 510.875 4 35.164 530.438 5 48.689 550.000 6 466.600 418.569 7 466.600 404.300 8 466.600 390.031 9 466.600 375.761 10 466.600 361.492 11 466.600 347.222 12 466.600 323.440 13 466.600 299.658 14 466.600 133.181 15 466.600 85.616 16 466.600 61.834 17 466.600 38.052 18 466.600 14.269 2 18 + + c 3 17 - - c 4 16 - - c 5 15 + + c 7 14 + + c 12 9 W S t 13 13 + + c 14 12 - - c 15 11 + + c 17 8 W H t 18 10 + + c 19 5 - - c 20 4 + + c 21 3 + + c 22 2 + + c 6 13 ! ! ! 2 18 4 13 13 3 19 5 4