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 GGCAGAUCUG AGCCUGGGAG CUCUCUGCC LOOP1 14 19 Crystallography ? ? Angstroms 1 G O3' -6.137 7.189 6.841 2 G P -5.616 6.440 5.514 O3' -4.008 9.690 1.601 3 C P -4.131 8.557 0.461 O3' 0.801 8.468 -2.003 4 A P 1.496 7.327 -2.903 O3' 6.746 7.501 -3.609 5 G P 7.328 6.224 -4.400 O3' 11.853 3.222 -2.579 6 A P 12.122 1.690 -2.999 O3' 14.280 -1.896 -0.035 7 U P 14.207 -3.245 -0.913 O3' 10.563 -7.818 -0.465 8 C P 11.418 -8.337 -1.729 O3' 7.640 -12.491 -2.934 9 U P 7.888 -13.671 -4.002 O3' 6.474 -16.227 0.017 10 G P 6.185 -17.501 0.960 O3' 6.397 -17.974 4.630 11 A P 4.893 -18.497 4.885 O3' 3.060 -17.310 10.324 12 G P 2.174 -18.383 11.138 O3' -2.007 -15.126 13.166 13 C P -2.932 -16.053 14.108 O3' -8.047 -13.791 14.204 14 C P -9.091 -15.016 14.241 O3' -12.315 -16.709 10.437 15 U P -11.610 -17.897 9.605 O3' -9.035 -21.071 8.170 16 G P -10.352 -21.896 7.741 O3' -10.263 -18.446 3.079 17 G P -10.076 -18.201 1.497 O3' -15.558 -17.130 0.429 18 G P -15.492 -16.190 -0.876 O3' -15.802 -11.675 0.761 19 A P -16.433 -11.132 -0.619 O3' -14.391 -5.581 -0.232 20 G P -13.078 -4.855 -0.821 O3' -10.984 -3.423 3.980 21 C P -9.671 -2.491 3.998 O3' -6.787 -2.189 9.057 22 U P -5.380 -1.414 9.159 O3' -1.526 -3.434 12.522 23 C P -0.035 -2.933 12.867 O3' 4.722 -6.143 13.791 24 U P 6.153 -5.406 13.782 O3' 10.486 -5.281 12.104 25 C P 10.476 -4.410 13.461 O3' 11.945 0.619 11.801 26 U P 11.424 1.871 12.669 O3' 12.682 6.709 10.658 27 G P 11.997 7.983 11.369 O3' 12.189 12.685 8.879 28 C P 11.995 13.480 10.267 O3' 7.525 16.587 9.496 29 C P 7.006 17.290 10.850 O3' 1.990 19.096 10.716 14 syn 1 29 + + c 2 28 W W c 3 27 + + c 4 26 - - c 5 25 + + c 10 23 + + c 11 22 - - c 12 21 + + c 13 20 W W c 13 21 W W c 1 28 ! ! ! 16 18 ! ! ! 17 18 ! ! ! 3 27 3 10 23 4 SG1 1 2 SG2 6 9 SG3 14 19 SG4 24 24 SG5 28 29 1 347.009 0.000 2 313.075 5.973 3 279.141 11.946 4 222.584 21.901 5 166.027 31.857 6 132.093 37.830 7 98.159 43.803 8 64.225 49.776 9 30.291 55.749 10 23.541 227.965 11 23.541 285.391 12 23.541 342.817 13 23.541 400.244 14 0.000 455.351 15 15.084 513.346 16 62.491 550.000 17 122.415 550.000 18 169.822 513.346 19 184.906 455.351 20 161.364 400.244 21 161.364 342.817 22 161.364 285.391 23 161.364 227.965 24 155.985 173.566 25 189.919 167.593 26 246.476 157.638 27 303.033 147.683 28 336.967 141.709 29 370.901 135.736