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 GGAAGUUCGG UCUUCGGACC GGCUUCC LOOP1 14 15 Crystallography ? ? Angstroms 1 G O3' 4.434 -5.525 9.912 2 G P 4.119 -4.761 8.530 O3' 4.809 -4.617 4.149 3 A P 3.371 -3.898 4.052 O3' 1.479 -4.539 -1.322 4 A P 0.019 -3.959 -1.668 O3' -2.945 -6.427 -4.944 5 G P -4.516 -6.099 -5.064 O3' -8.269 -10.002 -6.325 6 U P -9.827 -9.645 -6.523 O3' -14.037 -10.535 -3.715 7 U P -14.776 -10.028 -5.055 O3' -15.187 -5.355 -3.165 8 C P -16.684 -5.570 -3.717 O3' -17.568 -3.933 -0.847 9 G P -17.526 -2.382 -1.279 O3' -18.000 1.636 2.106 10 G P -17.683 3.167 1.719 O3' -16.041 6.213 6.141 11 U P -15.923 7.782 5.801 O3' -11.712 10.681 8.280 12 C P -12.036 12.159 7.728 O3' -7.139 15.095 7.694 13 U P -7.577 16.575 7.235 O3' -4.433 18.923 3.205 14 U P -5.339 20.246 3.399 O3' -4.603 21.228 -2.111 15 C P -5.714 20.853 -3.213 O3' -6.894 15.117 -4.393 16 G P -6.287 14.373 -5.682 O3' -4.271 9.432 -6.171 17 G P -3.508 8.089 -6.669 O3' 0.264 6.033 -2.664 18 A P 0.203 4.462 -2.317 O3' 0.680 4.064 3.047 19 C P 0.639 2.493 3.388 O3' -1.923 1.383 7.657 20 C P -1.510 -0.172 7.627 O3' -4.602 -2.877 11.348 21 G P -4.043 -4.386 11.355 O3' -7.402 -8.073 11.367 22 G P -6.221 -9.138 11.114 O3' -8.477 -14.016 10.955 23 C P -7.135 -14.888 10.775 O3' -7.607 -18.577 6.402 24 U P -6.176 -19.318 6.386 O3' -4.551 -20.623 1.074 25 U P -3.035 -21.166 1.066 O3' 0.349 -20.070 -3.036 26 C P 1.794 -20.638 -2.610 O3' 6.369 -17.820 -3.826 27 C P 7.814 -18.121 -3.181 O3' 10.728 -16.239 1.011 7 syn 14 syn 16 syn 1 27 + + c 2 26 + + c 3 25 - - c 4 24 - - c 5 23 + + c 6 22 W W c 8 21 + + c 9 20 + + c 10 19 + + c 11 18 - - c 12 17 + + c 13 16 ! ! ! 7 8 ! ! ! 15 16 ! ! ! 1 27 6 8 21 6 SG1 7 7 SG2 14 15 1 98.661 0.000 2 98.661 41.109 3 98.661 82.218 4 98.661 123.327 5 98.661 164.435 6 98.661 205.544 7 98.661 246.653 8 98.661 287.762 9 98.661 328.871 10 98.661 369.980 11 98.661 411.089 12 98.661 452.197 13 98.661 493.306 14 79.287 550.000 15 19.374 550.000 16 0.000 493.306 17 0.000 452.197 18 0.000 411.089 19 0.000 369.980 20 0.000 328.871 21 0.000 287.762 22 0.000 205.544 23 0.000 164.435 24 0.000 123.327 25 0.000 82.218 26 0.000 41.109 27 0.000 0.000