1 27 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 GGAAGUCCGG UCUUCGGACC GGCUUCC LOOP1 12 17 Crystallography ? ? Angstroms 1 G O3' -7.724 -3.502 -19.153 2 G P -6.206 -3.616 -18.623 O3' -3.930 1.214 -16.627 3 A P -2.416 1.159 -16.082 O3' -1.289 3.309 -11.443 4 A P 0.180 3.059 -10.834 O3' 1.157 2.234 -5.776 5 G P 2.597 1.786 -5.216 O3' 2.608 -2.296 -0.580 6 U P 2.806 -1.349 0.704 O3' 4.269 -5.758 1.539 7 C P 5.368 -5.120 2.525 O3' 9.718 -8.677 1.340 8 C P 11.141 -8.036 0.941 O3' 14.697 -11.020 -1.482 9 G P 15.886 -9.952 -1.677 O3' 18.655 -11.030 -6.078 10 G P 19.795 -9.947 -6.429 O3' 20.866 -8.650 -11.346 11 U P 22.010 -7.519 -11.284 O3' 22.910 -3.584 -14.742 12 C P 23.749 -2.236 -14.458 O3' 23.775 2.297 -14.644 13 U P 25.110 2.560 -13.784 O3' 25.314 5.459 -9.215 14 U P 26.696 5.305 -8.402 O3' 25.913 9.707 -4.751 15 C P 25.167 10.575 -3.616 O3' 20.334 7.479 -1.698 16 G P 20.021 6.077 -0.963 O3' 14.578 7.052 -2.526 17 G P 13.465 5.883 -2.536 O3' 10.353 7.205 -6.476 18 A P 9.294 6.216 -7.184 O3' 9.241 4.579 -12.220 19 C P 8.210 3.420 -12.650 O3' 8.639 -0.545 -15.494 20 C P 7.271 -1.351 -15.220 O3' 6.719 -6.525 -16.367 21 G P 5.317 -7.102 -15.827 O3' 4.747 -12.340 -14.136 22 G P 3.148 -12.275 -13.956 O3' 1.691 -16.066 -10.263 23 C P 0.100 -15.923 -10.465 O3' -2.556 -15.279 -5.743 24 U P -4.059 -15.090 -6.287 O3' -6.940 -11.295 -3.193 25 U P -8.364 -10.682 -3.629 O3' -9.551 -5.691 -1.332 26 C P -11.116 -5.444 -1.622 O3' -12.336 -0.454 -2.828 27 C P -13.937 -0.428 -3.005 O3' -17.512 0.777 -7.490 15 syn 16 syn 1 27 W W c 2 26 + + c 3 25 - - c 4 24 - - c 5 23 + + c 7 22 + + c 8 21 + + c 9 20 + + c 10 19 + + c 11 18 - - c 12 17 W W c 13 16 S W t 12 16 ! ! ! 13 14 ! ! ! 1 27 5 7 22 5 SG1 6 6 SG2 12 17 1 122.580 0.000 2 122.580 43.624 3 122.580 87.248 4 122.580 130.871 5 122.580 174.495 6 122.580 218.119 7 122.580 261.743 8 122.580 305.367 9 122.580 348.990 10 122.580 392.614 11 122.580 436.238 12 140.463 478.100 13 129.005 522.156 14 92.992 550.000 15 47.471 550.000 16 11.458 522.156 17 0.000 478.100 18 17.883 436.238 19 17.883 392.614 20 17.883 348.990 21 17.883 305.367 22 17.883 261.743 23 17.883 174.495 24 17.883 130.871 25 17.883 87.248 26 17.883 43.624 27 17.883 0.000