1 29 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 GGCAGAUCUG AGCCUGGGAG CUCUCUGCC LOOP1 14 19 Crystallography ? ? Angstroms 1 G O3' 14.884 -8.917 -0.069 2 G P 15.027 -8.266 1.400 O3' 12.196 -3.376 0.573 3 C P 11.461 -2.018 1.050 O3' 12.517 0.784 -3.907 4 A P 12.533 2.397 -3.936 O3' 8.736 3.954 -7.808 5 G P 8.227 5.416 -8.264 O3' 3.254 6.019 -10.418 6 A P 3.181 7.598 -10.735 O3' -1.462 10.104 -9.083 7 U P -1.896 11.639 -8.851 O3' -4.378 14.888 -8.096 8 C P -4.234 15.588 -9.545 O3' -7.711 12.054 -7.735 9 U P -8.401 10.638 -7.394 O3' -8.222 14.272 -3.704 10 G P -7.999 15.174 -5.021 O3' -5.191 17.452 -1.298 11 A P -4.365 18.837 -1.328 O3' -1.818 19.354 3.812 12 G P -1.258 20.866 3.894 O3' 3.977 20.428 5.412 13 C P 4.666 21.835 5.034 O3' 10.302 20.990 6.003 14 C P 11.187 22.285 5.630 O3' 15.802 21.358 3.114 15 U P 16.794 22.627 3.171 O3' 19.859 22.555 -1.451 16 G P 18.765 23.347 -2.331 O3' 17.885 19.865 -5.148 17 G P 16.914 18.768 -4.473 O3' 12.472 19.528 -7.356 18 G P 11.274 19.503 -8.439 O3' 13.966 14.751 -10.501 19 A P 13.219 13.936 -11.678 O3' 12.802 9.927 -7.192 20 G P 11.963 10.550 -5.961 O3' 14.522 9.129 -1.616 21 C P 13.846 7.675 -1.766 O3' 10.304 6.657 2.796 22 U P 9.147 5.564 2.548 O3' 5.589 6.560 6.769 23 C P 4.211 5.721 6.763 O3' -0.387 7.757 8.739 24 U P -0.759 6.244 9.184 O3' -4.702 4.837 5.479 25 C P -4.872 3.235 5.436 O3' -6.293 1.627 0.556 26 U P -6.247 0.016 0.458 O3' -5.195 -2.714 -3.755 27 G P -4.841 -4.260 -3.463 O3' -2.457 -7.306 -6.517 28 C P -2.309 -8.625 -5.603 O3' -0.463 -6.395 -0.454 29 C P -1.170 -4.979 -0.083 O3' 3.270 -1.985 1.425 18 syn 2 27 W W t 2 28 W W c 3 27 + + c 4 26 - - c 5 25 + + c 6 24 - - c 10 23 + + c 11 22 - - c 12 21 + + c 13 20 + + c 8 10 ! ! ! 3 27 4 10 23 4 SG1 1 2 SG2 7 9 SG3 14 19 SG4 28 29 1 111.927 0.000 2 111.927 23.900 3 111.927 47.799 4 111.927 87.632 5 111.927 127.464 6 111.927 167.297 7 111.927 207.129 8 111.927 246.962 9 111.927 286.794 10 111.927 326.627 11 111.927 366.460 12 111.927 406.292 13 111.927 446.125 14 128.256 484.348 15 117.794 524.576 16 84.911 550.000 17 43.345 550.000 18 10.462 524.576 19 0.000 484.348 20 16.329 446.125 21 16.329 406.292 22 16.329 366.460 23 16.329 326.627 24 16.329 167.297 25 16.329 127.464 26 16.329 87.632 27 16.329 47.799 28 16.329 23.900 29 16.329 0.000