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 14 15 Crystallography ? ? Angstroms 1 G O3' 6.891 -9.048 -28.473 2 G P 5.342 -9.039 -28.036 O3' 4.162 -12.500 -23.590 3 A P 2.834 -12.599 -22.684 O3' 2.192 -12.255 -17.617 4 A P 0.653 -12.335 -17.153 O3' -0.875 -9.810 -12.803 5 G P -2.402 -9.874 -12.295 O3' -4.225 -4.939 -9.466 6 U P -3.525 -5.026 -8.018 O3' -7.892 -3.359 -7.985 7 C P -8.608 -1.918 -7.961 O3' -13.425 -4.746 -9.557 8 C P -13.911 -6.271 -9.728 O3' -18.532 -7.416 -11.886 9 G P -18.676 -9.019 -11.941 O3' -21.412 -11.195 -16.053 10 G P -21.488 -12.752 -16.454 O3' -20.709 -15.669 -19.848 11 U P -20.374 -17.070 -19.125 O3' -18.195 -21.537 -21.583 12 C P -17.396 -22.801 -20.983 O3' -13.695 -25.428 -21.456 13 U P -13.849 -26.340 -20.140 O3' -9.865 -26.622 -16.382 14 U P -10.369 -27.461 -15.101 O3' -5.041 -28.754 -13.275 15 C P -4.201 -28.096 -12.069 O3' -3.312 -22.399 -12.091 16 G P -4.172 -21.267 -11.332 O3' -1.667 -17.411 -14.611 17 G P -2.198 -15.907 -14.853 O3' -0.991 -14.991 -19.815 18 A P -1.581 -13.717 -20.603 O3' -4.136 -14.735 -25.324 19 C P -4.448 -13.357 -26.099 O3' -8.621 -12.321 -28.465 20 C P -8.509 -10.734 -28.712 O3' -11.494 -7.143 -28.574 21 G P -10.660 -5.770 -28.490 O3' -10.513 -1.861 -26.009 22 G P -9.031 -1.373 -25.612 O3' -9.144 3.579 -23.391 23 C P -7.632 3.922 -23.829 O3' -4.781 6.086 -19.748 24 U P -3.416 6.314 -20.574 O3' 1.266 5.440 -17.473 25 U P 2.756 5.230 -18.047 O3' 5.731 2.154 -14.181 26 C P 7.291 2.326 -14.548 O3' 10.363 -1.859 -13.558 27 C P 11.834 -1.383 -14.005 O3' 15.376 -3.521 -16.104 15 syn 16 syn 2 26 + + c 3 25 - - c 4 24 - - c 5 23 + + c 7 22 + + c 8 21 W W c 9 20 + + c 10 19 W W c 11 18 - - c 12 17 W W c 13 16 S W t 12 16 ! ! ! 13 14 ! ! ! 2 26 4 7 22 7 SG1 1 1 SG2 6 6 SG3 14 15 SG4 27 27 1 0.000 0.000 2 0.000 25.425 3 0.000 67.801 4 0.000 110.177 5 0.000 152.553 6 0.000 194.929 7 0.000 237.304 8 0.000 279.680 9 0.000 322.056 10 0.000 364.432 11 0.000 406.808 12 0.000 449.183 13 0.000 491.559 14 19.971 550.000 15 81.731 550.000 16 101.702 491.559 17 101.702 449.183 18 101.702 406.808 19 101.702 364.432 20 101.702 322.056 21 101.702 279.680 22 101.702 237.304 23 101.702 152.553 24 101.702 110.177 25 101.702 67.801 26 101.702 25.425 27 101.702 0.000