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' 0.679 -6.578 7.754 2 C P -0.803 -7.037 8.218 O3' -2.109 -5.608 13.337 3 A P -3.606 -5.783 13.922 O3' -6.088 -2.888 17.359 4 G P -7.671 -3.125 17.596 O3' -10.722 1.079 19.557 5 A P -12.320 0.929 19.726 O3' -16.048 4.429 18.695 6 C P -17.531 3.812 18.882 O3' -21.616 4.257 15.460 7 U P -22.807 3.644 16.352 O3' -26.510 0.268 14.962 8 U P -27.362 -0.551 16.069 O3' -28.692 -5.530 14.786 9 U P -27.676 -6.317 15.773 O3' -24.380 -8.318 12.584 10 U P -23.615 -7.168 11.733 O3' -19.810 -8.665 7.892 11 A P -19.016 -7.261 7.811 O3' -19.113 -4.141 3.516 12 A P -17.930 -3.065 3.259 O3' -18.213 1.735 1.063 13 P O3' -16.228 7.283 3.546 P -16.822 2.511 1.364 14 C P -14.668 7.679 3.684 O3' -12.642 10.392 7.634 15 U P -11.096 10.669 7.262 O3' -7.217 10.778 10.678 16 G P -5.717 10.778 10.070 O3' -1.603 9.594 13.256 17 A P -0.157 9.773 12.577 O3' 4.013 6.874 12.893 1 17 - - c 2 16 + + c 3 15 - - c 4 14 + + c 5 13 W W c 6 12 ! ! ! 7 10 ! ! ! 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