1 28 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 26 27 28 GGCUCGUGUA GCUCAUUAGC UCCGAGCC LOOP1 14 17 Crystallography ? ? Angstroms 1 G P 14.831 8.845 13.856 O3' 10.788 11.187 10.459 2 G P 9.544 10.555 9.626 O3' 6.993 13.599 5.774 3 C P 5.829 12.876 4.906 O3' 5.013 12.942 -0.312 4 U P 3.890 11.842 -0.726 O3' 4.230 8.753 -5.175 5 C P 3.165 7.524 -5.235 O3' 4.536 2.633 -7.418 6 G P 3.612 1.330 -7.108 O3' 4.357 -3.832 -6.650 7 U P 3.198 -3.662 -7.770 O3' 2.418 -9.652 -6.689 8 G P 3.806 -10.287 -6.133 O3' 5.752 -11.583 -1.378 9 U P 6.587 -12.941 -1.753 O3' 1.462 -13.633 -2.968 10 A P 0.914 -12.137 -2.580 O3' -1.671 -12.934 1.779 11 G P -3.251 -12.568 1.674 O3' -6.246 -11.774 6.054 12 C P -7.817 -11.746 5.666 O3' -11.645 -8.937 7.655 13 U P -13.007 -9.540 7.032 O3' -17.393 -7.097 5.344 14 C P -18.493 -8.024 4.590 O3' -21.330 -6.863 0.303 15 A P -21.563 -8.327 -0.372 O3' -19.950 -4.616 -4.488 16 U P -20.356 -3.062 -4.340 O3' -14.547 -2.607 -5.722 17 U P -13.412 -1.654 -5.069 O3' -11.392 2.844 -8.815 18 A P -10.264 3.379 -7.780 O3' -9.439 6.192 -2.862 19 G P -10.069 7.417 -1.988 O3' -8.266 5.883 3.363 20 C P -8.873 6.411 4.779 O3' -6.701 2.790 8.797 21 U P -5.270 3.064 9.542 O3' -1.653 0.397 10.391 22 C P -0.240 1.131 10.068 O3' 4.404 -1.593 10.977 23 C P 5.759 -0.731 10.737 O3' 10.046 -3.093 8.227 24 G P 11.330 -2.236 7.726 O3' 14.536 -3.395 3.624 25 A P 15.705 -2.274 3.523 O3' 17.560 -0.326 -1.128 26 G P 18.583 0.937 -1.051 O3' 18.798 4.704 -5.070 27 C P 19.807 5.959 -4.836 O3' 18.464 11.135 -6.023 28 C P 19.508 12.312 -5.619 O3' 18.075 17.144 -3.619 1 28 + + c 2 27 + + c 3 26 + + c 4 25 - - c 5 24 + + c 6 23 W W c 7 10 W H c 8 22 + + c 8 23 W W c 10 21 - - c 11 20 + + c 12 19 + + c 13 18 - - c 1 27 ! ! ! 1 28 6 10 21 4 SG1 7 9 SG2 14 17 SG3 22 22 1 4.960 0.000 2 4.960 36.675 3 4.960 73.350 4 4.960 110.026 5 4.960 146.701 6 4.960 183.376 7 4.960 220.051 8 4.960 293.401 9 4.960 330.077 10 4.960 366.752 11 4.960 403.427 12 4.960 440.102 13 4.960 476.777 14 0.000 518.550 15 27.937 550.000 16 70.003 550.000 17 97.940 518.550 18 92.980 476.777 19 92.980 440.102 20 92.980 403.427 21 92.980 366.752 22 92.980 256.726 23 92.980 183.376 24 92.980 146.701 25 92.980 110.026 26 92.980 73.350 27 92.980 36.675 28 92.980 0.000