1 15 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 GCGCUGACAA AGCGC LOOP1 7 9 Crystallography ? ? Angstroms 1 G O3' 7.963 5.913 8.296 2 C P 6.737 6.019 7.282 O3' 6.483 7.945 2.493 3 G P 5.280 7.346 1.636 O3' 5.948 6.015 -3.953 4 C P 4.684 5.588 -4.795 O3' 3.716 1.633 -7.249 5 U P 3.415 1.260 -8.750 O3' 0.768 -3.879 -8.719 6 G P -0.806 -3.928 -8.633 O3' -3.528 -7.327 -5.815 7 A P -4.779 -6.796 -6.633 O3' -6.005 -4.203 -2.552 8 C P -5.699 -3.139 -3.701 O3' -3.968 -1.841 0.744 9 A P -2.575 -2.557 0.556 O3' -1.456 -5.190 5.286 10 A P 0.087 -4.859 5.500 O3' 3.251 -8.951 7.135 11 A P 4.688 -8.277 6.950 O3' 8.428 -10.902 4.022 12 G P 9.685 -9.929 3.878 O3' 12.138 -10.552 -1.072 13 C P 13.576 -9.906 -0.919 O3' 15.509 -6.585 -4.383 14 G P 16.742 -5.710 -3.894 O3' 17.965 -0.145 -5.230 15 C P 19.241 0.456 -4.503 O3' 19.398 5.599 -2.971 1 15 + + c 2 14 + + c 3 13 + + c 4 12 + + c 5 11 - - c 6 10 S H t 6 9 ! ! ! 1 15 6 SG1 7 9 1 0.000 0.000 2 0.000 80.223 3 0.000 160.446 4 0.000 240.669 5 0.000 320.891 6 0.000 401.114 7 7.619 501.754 8 96.267 550.000 9 184.916 501.754 10 192.535 401.114 11 192.535 320.891 12 192.535 240.669 13 192.535 160.446 14 192.535 80.223 15 192.535 0.000