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 GGCGUCACAC CUUCGGGUGA AGUCGCC LOOP1 13 14 Crystallography ? ? Angstroms 1 G P 5.613 19.763 1.215 O3' 3.097 17.203 4.947 2 G P 3.033 15.646 4.497 O3' -1.021 12.304 5.432 3 C P -0.764 10.832 4.800 O3' -4.430 7.777 2.432 4 G P -3.900 6.456 1.653 O3' -5.893 3.857 -2.438 5 U P -4.814 2.764 -2.965 O3' -4.048 1.486 -8.144 6 C P -2.851 0.448 -8.523 O3' 0.226 0.903 -13.022 7 A P 1.375 -0.227 -13.173 O3' 6.251 0.186 -15.124 8 C P 6.560 -1.391 -15.315 O3' 10.939 -3.704 -13.380 9 A P 10.748 -5.305 -13.195 O3' 13.176 -8.185 -9.319 10 C P 12.787 -9.761 -9.282 O3' 12.194 -12.595 -4.653 11 C P 11.726 -14.148 -4.758 O3' 8.078 -16.481 -1.291 12 U P 7.309 -17.884 -1.631 O3' 1.764 -18.635 -1.466 13 U P 0.887 -19.897 -1.982 O3' -4.561 -19.008 -4.374 14 C P -4.555 -19.304 -5.968 O3' -3.384 -14.963 -9.944 15 G P -4.708 -14.386 -10.683 O3' -6.577 -9.847 -7.573 16 G P -6.152 -8.323 -7.209 O3' -4.480 -5.805 -2.019 17 G P -3.559 -4.518 -1.655 O3' -0.165 -4.439 2.622 18 U P 0.635 -3.035 2.778 O3' 6.022 -3.047 3.909 19 G P 6.661 -1.556 3.797 O3' 11.902 -1.045 1.766 20 A P 12.208 0.459 2.297 O3' 12.470 5.157 -0.650 21 A P 11.268 5.934 -1.418 O3' 12.338 9.900 -5.262 22 G P 10.923 10.678 -5.250 O3' 9.300 12.856 -9.961 23 U P 7.906 13.652 -9.745 O3' 4.167 13.552 -13.720 24 C P 3.044 14.700 -13.531 O3' -2.173 13.933 -13.996 25 G P -3.033 15.192 -13.439 O3' -8.050 15.061 -11.543 26 C P -8.474 16.502 -10.925 O3' -11.357 17.069 -6.351 27 C P -11.768 18.564 -5.885 O3' -11.862 20.367 -0.515 15 syn 1 27 + + c 2 26 + + c 3 25 + + c 4 24 + + c 6 22 + + c 8 19 + + c 9 18 - - c 10 17 + + c 11 16 + + c 12 15 S W t 8 21 ! ! ! 1 27 4 8 19 5 SG1 5 7 SG2 13 14 SG3 20 23 1 219.844 0.000 2 187.300 38.751 3 154.756 77.503 4 122.212 116.254 5 102.686 139.505 6 83.159 162.756 7 63.633 186.007 8 0.000 277.794 9 0.000 328.399 10 0.000 379.003 11 0.000 429.607 12 0.000 480.211 13 23.849 550.000 14 97.601 550.000 15 121.450 480.211 16 121.450 429.607 17 121.450 379.003 18 121.450 328.399 19 121.450 277.794 20 137.110 287.363 21 156.636 264.113 22 176.163 240.862 23 195.689 217.611 24 215.216 194.360 25 247.759 155.608 26 280.303 116.857 27 312.847 78.105