1 17 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 CAUGAGGAuu ACCCAUG 9 SUR 10 SUR LOOP1 5 13 Crystallography ? ? Angstroms 1 C O3' -20.974 4.048 -104.406 2 A P -21.808 5.350 -104.863 O3' -26.975 5.307 -103.565 3 U P -27.375 6.590 -104.447 O3' -30.631 10.470 -103.059 4 G P -30.407 11.827 -103.905 O3' -31.191 16.655 -102.170 5 A P -31.276 16.725 -103.777 O3' -32.201 20.861 -101.145 6 G P -31.945 19.794 -99.963 O3' -27.806 22.649 -99.493 7 G P -27.172 23.641 -100.589 O3' -23.402 26.805 -99.818 8 A P -22.901 27.332 -101.257 O3' -18.016 29.070 -101.145 9 u P -17.577 29.759 -102.525 O3' -12.125 28.208 -102.906 10 u P -11.789 27.280 -104.176 O3' -12.001 22.247 -106.514 11 A P -10.558 21.639 -106.907 O3' -9.368 16.289 -105.544 12 C P -8.366 16.346 -104.293 O3' -11.194 16.879 -99.147 13 C P -11.994 16.059 -97.997 O3' -14.886 17.453 -93.798 14 C P -15.741 16.323 -93.021 O3' -20.180 16.812 -90.384 15 A P -20.616 15.400 -89.733 O3' -25.404 13.690 -88.742 16 U P -25.280 12.161 -88.231 O3' -29.024 8.715 -89.825 17 G P -28.652 7.243 -89.275 O3' -28.860 2.706 -91.127 5 syn 1 17 + + c 2 16 - - c 3 15 - - c 4 14 + + c 6 13 + + c 8 9 ! ! ! 1 17 4 SG1 5 13 1 38.703 93.343 2 38.703 105.395 3 38.703 117.447 4 38.703 129.499 5 46.301 138.841 6 48.481 150.684 7 44.707 162.119 8 35.907 170.337 9 24.241 173.321 10 12.575 170.337 11 3.774 162.119 12 0.000 150.684 13 2.180 138.841 14 9.778 129.499 15 9.778 117.447 16 9.778 105.395 17 9.778 93.343 1 13 4 5 6 7 8 9 10 11 12 13 14 15 16 UGA GGAuuACCCA 7 SUR 8 SUR LOOP2 3 11 Crystallography ? ? Angstroms 1 U O3' 14.524 27.177 -98.673 2 G P 15.571 26.634 -99.772 O3' 20.299 24.833 -98.776 3 A P 20.281 25.109 -100.360 O3' 24.765 23.286 -98.621 4 G P 23.918 23.362 -97.256 O3' 24.184 18.376 -98.066 5 G P 24.528 17.476 -99.350 O3' 25.642 12.665 -99.966 6 A P 25.476 11.928 -101.389 O3' 23.401 6.652 -102.616 7 u P 23.887 6.388 -104.126 O3' 18.811 2.893 -105.280 8 u P 17.654 3.375 -106.289 O3' 13.716 7.155 -106.671 9 A P 12.333 6.387 -106.961 O3' 7.851 8.023 -103.762 10 C P 7.507 6.911 -102.654 O3' 10.189 7.054 -97.580 11 C P 9.913 7.961 -96.279 O3' 13.391 8.846 -92.400 12 C P 13.009 10.072 -91.422 O3' 16.473 12.321 -88.240 13 A P 15.761 13.382 -87.259 O3' 16.867 17.659 -85.141 3 syn 1 13 - - c 2 12 + + c 5 11 W W c 7 8 ! ! ! 1 13 2 SG1 3 11 1 491.406 20.663 2 502.758 16.614 3 509.004 6.319 4 519.426 0.287 5 531.464 0.000 6 542.162 5.528 7 548.891 15.514 8 550.000 27.504 9 545.216 38.554 10 535.713 45.950 11 523.827 47.876 12 512.475 43.857 13 501.124 47.906