1 27 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 UGCUCCUAGU ACGAGAGGAC CGGAGUG LOOP1 14 15 Crystallography ? ? Angstroms 1 U O3' 17.847 -34.344 -28.131 2 G P 16.921 -35.541 -27.595 O3' 19.295 -38.430 -23.616 3 C P 18.169 -39.135 -22.722 O3' 17.856 -39.094 -17.762 4 U P 16.430 -39.655 -17.299 O3' 12.853 -36.913 -13.799 5 C P 11.368 -37.515 -13.771 O3' 7.626 -34.278 -12.002 6 C P 6.152 -34.858 -12.237 O3' 1.967 -32.045 -12.845 7 U P 0.818 -33.154 -12.923 O3' -2.885 -33.050 -16.594 8 A P -3.542 -33.808 -15.362 O3' -1.097 -38.035 -12.763 9 G P -1.404 -38.254 -11.190 O3' -3.553 -42.306 -14.180 10 U P -4.833 -43.100 -14.694 O3' -7.702 -40.179 -17.919 11 A P -8.394 -41.291 -18.840 O3' -8.654 -41.608 -23.823 12 C P -9.380 -43.034 -23.949 O3' -7.664 -46.941 -26.715 13 G P -8.705 -48.088 -26.322 O3' -7.563 -52.878 -25.242 14 A P -9.144 -53.176 -25.024 O3' -9.397 -54.077 -19.662 15 G P -8.422 -52.909 -19.188 O3' -4.687 -55.301 -15.822 16 A P -3.347 -54.512 -15.428 O3' 1.356 -56.272 -15.592 17 G P 1.998 -54.935 -15.001 O3' 4.640 -51.248 -18.526 18 G P 5.159 -49.858 -17.922 O3' 4.521 -45.464 -20.549 19 A P 5.089 -44.228 -19.705 O3' 5.187 -40.423 -23.373 20 C P 5.284 -38.838 -23.591 O3' 5.442 -37.330 -28.676 21 C P 6.176 -35.933 -28.431 O3' 4.016 -31.557 -30.453 22 G P 5.036 -30.434 -29.908 O3' 3.767 -26.337 -27.102 23 G P 5.214 -25.744 -26.651 O3' 5.602 -23.530 -21.870 24 A P 7.069 -22.899 -21.847 O3' 9.845 -22.482 -17.455 25 G P 11.451 -22.369 -17.635 O3' 15.408 -23.719 -14.808 26 U P 16.718 -23.117 -15.509 O3' 21.154 -25.834 -15.732 27 G P 22.168 -25.081 -16.739 O3' 25.884 -27.903 -19.591 2 26 W W c 3 25 + + c 4 24 - - c 5 23 + + c 6 22 + + c 9 10 S H c 10 19 W H t 11 18 H S t 12 17 + + c 13 16 S H t 7 21 ! ! ! 1 2 ! ! ! 8 20 ! ! ! 9 19 ! ! ! 2 26 6 10 19 4 SG1 1 1 SG2 8 9 SG3 14 15 SG4 20 20 SG5 27 27 1 0.000 0.000 2 0.000 23.607 3 0.000 62.951 4 0.000 102.295 5 0.000 141.640 6 0.000 180.984 7 0.000 220.329 8 0.000 259.673 9 0.000 338.362 10 0.000 377.706 11 0.000 417.051 12 0.000 456.395 13 0.000 495.740 14 18.543 550.000 15 75.884 550.000 16 94.427 495.740 17 94.427 456.395 18 94.427 417.051 19 94.427 377.706 20 94.427 299.018 21 94.427 220.329 22 94.427 180.984 23 94.427 141.640 24 94.427 102.295 25 94.427 62.951 26 94.427 23.607 27 94.427 0.000