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 GCCAGAUUUG AGCCUGGGAG CUCUCUGGC LOOP1 14 19 Crystallography ? ? Angstroms 1 G O3' 0.169 -13.145 -6.310 2 C P -1.164 -12.267 -6.097 O3' -1.557 -14.805 -1.166 3 C P -2.665 -14.358 -0.092 O3' -2.281 -9.901 3.494 4 A P -3.472 -9.100 4.222 O3' -1.204 -4.796 7.200 5 G P -2.448 -3.957 7.780 O3' -1.307 1.260 7.796 6 A P -2.846 1.003 8.202 O3' -0.857 6.178 7.678 7 U P -0.656 6.434 9.250 O3' -0.471 10.286 6.916 8 U P -0.205 11.777 7.487 O3' 2.684 14.841 5.929 9 U P 2.343 16.347 5.479 O3' -2.770 13.955 4.197 10 G P -3.304 12.965 5.353 O3' -3.032 12.759 1.738 11 A P -4.633 12.779 1.923 O3' -6.886 13.377 -2.799 12 G P -7.881 14.289 -1.923 O3' -12.234 11.128 -3.638 13 C P -13.596 10.734 -2.876 O3' -16.153 6.935 -5.891 14 C P -17.685 7.263 -5.529 O3' -20.652 4.938 -2.487 15 U P -21.577 6.202 -2.861 O3' -21.148 7.940 2.764 16 G P -20.478 7.856 4.225 O3' -19.521 2.637 5.323 17 G P -18.587 2.039 4.157 O3' -17.116 1.983 7.550 18 G P -18.212 1.271 8.486 O3' -14.063 -2.798 8.045 19 A P -12.646 -2.799 8.803 O3' -11.252 -5.970 6.036 20 G P -10.709 -4.723 5.178 O3' -11.541 -5.855 -0.222 21 C P -9.981 -6.225 -0.349 O3' -8.530 -2.998 -4.463 22 U P -6.934 -3.196 -4.447 O3' -5.478 0.807 -8.279 23 C P -3.881 0.854 -8.491 O3' -0.394 5.728 -9.460 24 U P 0.833 6.658 -8.975 O3' 3.557 8.118 -6.511 25 C P 4.426 6.950 -7.197 O3' 8.382 5.150 -3.227 26 U P 9.203 3.777 -3.395 O3' 10.181 2.479 2.519 27 G P 11.200 1.488 3.274 O3' 11.192 -3.848 5.629 28 G P 11.760 -5.316 5.301 O3' 10.491 -9.600 5.983 29 C P 12.039 -9.254 5.717 O3' 12.196 -12.047 1.914 7 syn 1 29 + + c 2 28 + + 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 14 18 S W c 9 11 ! ! ! 16 17 ! ! ! 1 29 6 10 23 4 SG1 7 9 SG2 14 19 1 105.797 0.000 2 105.797 37.651 3 105.797 75.302 4 105.797 112.953 5 105.797 150.604 6 105.797 188.256 7 105.797 225.907 8 105.797 263.558 9 105.797 301.209 10 105.797 338.860 11 105.797 376.511 12 105.797 414.162 13 105.797 451.813 14 121.232 487.944 15 111.343 525.968 16 80.261 550.000 17 40.971 550.000 18 9.889 525.968 19 0.000 487.944 20 15.435 451.813 21 15.435 414.162 22 15.435 376.511 23 15.435 338.860 24 15.435 188.256 25 15.435 150.604 26 15.435 112.953 27 15.435 75.302 28 15.435 37.651 29 15.435 0.000