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 GGCGUCGCAC CUUCGGGUGA AGUCGCC LOOP1 13 14 Crystallography ? ? Angstroms 1 G O3' -0.779 10.150 28.213 2 G P -1.528 8.832 28.755 O3' -5.008 7.494 32.109 3 C P -5.216 5.995 31.558 O3' -10.405 4.616 31.324 4 G P -10.463 3.143 30.678 O3' -14.041 2.115 26.949 5 U P -13.760 0.682 26.265 O3' -14.398 0.657 20.752 6 C P -14.038 -0.688 19.941 O3' -11.775 -0.904 15.474 7 G P -11.496 -2.483 15.310 O3' -6.079 -3.764 13.599 8 C P -4.996 -4.953 13.709 O3' -0.172 -5.248 14.295 9 A P -0.033 -6.851 14.398 O3' 3.491 -8.953 17.728 10 C P 3.283 -10.539 17.928 O3' 3.521 -12.658 22.797 11 C P 3.072 -14.205 22.847 O3' 0.282 -16.229 26.973 12 U P -0.306 -17.711 26.739 O3' -5.364 -19.092 26.752 13 U P -5.441 -20.614 26.228 O3' -10.649 -20.801 23.535 14 C P -10.856 -20.781 21.935 O3' -10.087 -15.838 18.819 15 G P -11.423 -15.181 18.207 O3' -14.916 -13.359 20.975 16 G P -14.915 -11.751 21.085 O3' -13.507 -8.330 25.744 17 G P -13.086 -6.783 25.911 O3' -9.042 -5.794 29.583 18 U P -8.225 -4.411 29.729 O3' -3.214 -4.440 31.671 19 G P -2.746 -2.907 31.828 O3' 1.678 -1.141 30.062 20 A P 1.655 0.470 30.080 O3' 5.074 3.211 26.417 21 A P 5.329 4.797 26.575 O3' 4.245 6.575 20.745 22 G P 4.270 7.824 19.723 O3' 1.586 8.875 17.197 23 U P 1.012 10.324 17.608 O3' -4.287 11.918 15.988 24 C P -5.375 12.960 16.564 O3' -10.674 11.544 15.803 25 G P -11.661 12.610 16.500 O3' -15.776 12.744 19.520 26 C P -15.759 14.269 20.042 O3' -16.924 15.251 25.345 27 C P -16.752 16.799 25.758 O3' -13.730 18.086 29.894 15 syn 1 27 + + c 2 26 + + c 3 25 + + c 4 24 W W c 6 22 + + c 7 21 W W c 8 19 + + c 8 20 W W c 9 18 - - c 10 17 + + c 11 16 + + c 12 15 S H t 7 20 ! ! ! 1 27 4 6 22 2 8 19 5 SG1 5 5 SG2 13 14 SG3 20 20 SG4 23 23 1 0.000 0.000 2 0.000 38.250 3 0.000 76.500 4 0.000 114.750 5 0.000 153.000 6 0.000 229.500 7 0.000 267.750 8 0.000 344.249 9 0.000 382.499 10 0.000 420.749 11 0.000 458.999 12 0.000 497.249 13 18.027 550.000 14 73.773 550.000 15 91.800 497.249 16 91.800 458.999 17 91.800 420.749 18 91.800 382.499 19 91.800 344.249 20 91.800 305.999 21 91.800 267.750 22 91.800 229.500 23 91.800 191.250 24 91.800 114.750 25 91.800 76.500 26 91.800 38.250 27 91.800 0.000