1 17 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 UCAGACUUUU AAPCUGA 13 PSU LOOP1 7 11 Crystallography ? ? Angstroms 1 U O3' 0.826 -4.567 10.036 2 C P -0.355 -4.029 10.998 O3' 0.098 -0.826 14.978 3 A P -1.339 -0.386 15.573 O3' -2.460 4.007 17.998 4 G P -4.028 4.165 18.361 O3' -6.477 8.737 18.967 5 A P -8.056 8.645 19.302 O3' -11.497 12.571 18.555 6 C P -12.975 12.167 19.070 O3' -17.485 12.907 16.563 7 U P -18.741 12.231 17.324 O3' -23.335 10.847 14.292 8 U P -24.543 9.904 14.848 O3' -25.991 6.028 11.216 9 U P -26.147 5.103 12.529 O3' -23.585 0.275 12.717 10 U P -24.523 -1.061 12.798 O3' -19.721 -4.015 10.304 11 A P -18.132 -3.671 10.129 O3' -17.774 0.314 5.877 12 A P -16.627 1.261 5.209 O3' -17.891 5.926 3.360 13 P O3' -14.216 11.058 3.275 P -16.458 6.233 2.657 14 C P -12.637 11.242 2.968 O3' -9.229 14.294 5.329 15 U P -7.748 14.020 4.738 O3' -3.296 14.852 7.212 16 G P -1.952 14.459 6.405 O3' 2.557 13.267 8.932 17 A P 3.780 12.928 7.945 O3' 7.496 9.481 8.328 1 17 - - c 2 16 + + c 3 15 - - c 4 14 + + c 5 13 W W c 6 12 W W c 5 12 ! ! ! 1 17 6 SG1 7 11 1 21.799 0.000 2 21.799 74.324 3 21.799 148.649 4 21.799 222.973 5 21.799 297.297 6 21.799 371.622 7 0.000 449.044 8 35.971 520.986 9 110.988 550.000 10 186.005 520.986 11 221.976 449.044 12 200.177 371.622 13 200.177 297.297 14 200.177 222.973 15 200.177 148.649 16 200.177 74.324 17 200.177 0.000