1 45 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 GAUUCGACGG GGACUUCGGU CCUCGGACGC GGGUUCGAUU CCCGC LOOP1 15 18 LOOP2 34 40 Crystallography ? ? Angstroms 1 G O3' 67.210 67.908 74.548 2 A P 68.313 66.744 74.357 O3' 68.408 66.450 68.631 3 U P 67.800 65.514 67.470 O3' 66.074 60.085 68.268 4 U P 64.729 60.022 67.396 O3' 61.765 56.739 71.618 5 C P 63.050 56.878 72.570 O3' 66.083 53.332 69.495 6 G P 65.389 53.745 68.114 O3' 63.967 49.471 65.466 7 A P 63.494 47.943 65.187 O3' 59.944 46.694 61.568 8 C P 60.789 46.588 60.221 O3' 59.624 48.977 55.949 9 G P 60.921 48.627 55.071 O3' 62.467 52.067 51.716 10 G P 63.925 51.596 51.250 O3' 67.349 54.408 49.588 11 G P 68.695 53.612 49.241 O3' 74.164 54.354 50.488 12 G P 74.648 52.880 50.072 O3' 78.971 51.680 52.748 13 A P 79.446 50.155 52.788 O3' 82.829 48.605 56.179 14 C P 83.181 47.149 55.596 O3' 84.713 43.163 58.352 15 U P 84.695 42.118 57.147 O3' 83.440 37.068 58.298 16 U P 83.413 36.152 56.985 O3' 79.612 31.946 57.311 17 C P 79.611 31.878 55.702 O3' 74.086 32.482 55.022 18 G P 72.562 33.040 55.035 O3' 70.489 34.265 60.352 19 G P 70.144 35.604 61.159 O3' 72.865 38.014 65.628 20 U P 72.099 39.235 66.305 O3' 74.432 43.244 68.007 21 C P 73.587 44.585 68.198 O3' 74.985 49.898 66.955 22 C P 74.034 51.166 67.155 O3' 75.561 55.572 65.430 23 U P 74.407 56.596 65.860 O3' 73.067 60.315 62.450 24 C P 71.751 61.122 62.889 O3' 68.637 63.419 59.831 25 G P 67.354 63.841 60.684 O3' 62.538 64.293 58.653 26 G P 61.680 64.931 59.861 O3' 56.500 62.408 60.442 27 A P 55.361 63.534 60.420 O3' 56.779 66.500 65.362 28 C P 56.268 67.634 64.323 O3' 52.410 71.290 66.482 29 G P 52.108 72.285 65.254 O3' 49.370 69.166 61.944 30 C P 50.544 68.570 61.039 O3' 51.128 67.705 56.347 31 G P 52.632 67.198 56.126 O3' 56.742 68.751 52.415 32 G P 58.057 68.297 53.219 O3' 62.176 71.749 51.903 33 G P 63.649 71.466 52.478 O3' 67.155 75.229 53.027 34 U P 68.390 74.985 54.022 O3' 71.089 78.566 56.169 35 U P 72.222 77.448 56.008 O3' 75.089 76.547 60.157 36 C P 76.088 75.693 59.223 O3' 73.742 70.845 61.235 37 G P 72.201 71.026 60.829 O3' 68.402 70.389 64.013 38 A P 67.689 70.673 62.603 O3' 62.731 71.310 65.208 39 U P 62.407 70.352 66.468 O3' 58.325 73.407 65.892 40 U P 57.990 74.959 65.618 O3' 58.910 80.156 68.298 41 C P 58.935 81.054 66.963 O3' 60.892 83.898 64.132 42 C P 59.743 84.006 63.011 O3' 60.359 85.429 58.190 43 C P 58.904 85.515 57.513 O3' 57.252 84.608 53.200 44 G P 55.718 84.984 53.447 O3' 51.211 82.684 50.817 45 C P 49.645 82.626 51.189 O3' 45.703 78.304 50.864 38 syn 7 26 W W c 8 25 + + c 9 24 + + c 10 23 W W c 11 22 + + c 12 21 + + c 13 20 - - c 14 19 + + c 29 45 + + c 30 44 + + c 31 43 + + c 32 42 + + c 33 41 + + c 34 38 W W t 1 37 ! ! ! 8 26 ! ! ! 15 18 ! ! ! 16 18 ! ! ! 2 3 ! ! ! 7 26 8 29 45 5 SG1 1 6 SG2 15 18 SG3 27 28 SG4 34 40 1 3.721 346.606 2 3.721 330.097 3 3.721 313.587 4 3.721 297.077 5 3.721 280.568 6 3.721 264.058 7 3.721 247.549 8 3.721 220.033 9 3.721 192.516 10 3.721 165.000 11 3.721 137.484 12 3.721 109.968 13 3.721 82.452 14 3.721 54.936 15 0.000 23.596 16 20.960 0.000 17 52.521 0.000 18 73.481 23.596 19 69.760 54.936 20 69.760 82.452 21 69.760 109.968 22 69.760 137.484 23 69.760 165.000 24 69.760 192.516 25 69.760 220.033 26 69.760 247.549 27 69.760 264.058 28 69.760 280.568 29 171.507 550.000 30 174.571 522.655 31 177.634 495.310 32 180.698 467.965 33 183.761 440.620 34 200.160 417.832 35 200.964 389.768 36 185.896 366.078 37 160.137 354.909 38 132.546 360.101 39 112.610 379.869 40 107.183 407.415 41 118.133 433.268 42 115.070 460.613 43 112.006 487.958 44 108.943 515.303 45 105.879 542.648