1 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 UUGCGUCACA CCGGUGAAGU CGC Crystallography ? ? Angstroms 1 U O3' 49.332 14.101 -2.421 2 U P 49.626 12.525 -2.175 O3' 46.407 10.842 1.955 3 G P 44.838 11.294 1.937 O3' 44.961 9.162 6.728 4 C P 44.597 7.623 6.497 O3' 42.504 5.159 10.243 5 G P 42.462 3.652 9.751 O3' 37.701 0.471 9.763 6 U P 37.459 -0.907 8.977 O3' 32.984 -2.818 8.297 7 C P 33.536 -4.239 7.773 O3' 30.890 -6.568 4.324 8 A P 31.648 -7.743 3.529 O3' 31.511 -8.810 -1.323 9 C P 32.541 -9.886 -1.888 O3' 35.762 -10.855 -5.221 10 A P 36.738 -12.135 -4.951 O3' 41.395 -13.047 -6.702 11 C P 41.671 -14.420 -5.920 O3' 45.958 -15.618 -3.487 12 C P 46.190 -16.872 -2.512 O3' 48.646 -17.820 2.251 13 G P 48.079 -19.316 2.190 O3' 48.235 -20.871 7.349 14 G P 47.355 -22.176 7.621 O3' 44.858 -23.140 11.955 15 U P 44.089 -24.506 11.632 O3' 39.962 -25.345 14.454 16 G P 39.387 -26.747 13.978 O3' 34.213 -27.504 14.484 17 A P 34.216 -29.012 13.935 O3' 31.574 -30.946 11.051 18 A P 31.618 -31.816 9.693 O3' 27.765 -34.366 6.448 19 G P 28.646 -34.521 5.110 O3' 27.461 -33.195 0.502 20 U P 28.442 -34.253 -0.215 O3' 30.090 -33.386 -4.840 21 C P 30.718 -34.784 -5.289 O3' 34.840 -35.154 -8.439 22 G P 35.455 -36.624 -8.553 O3' 40.364 -37.821 -8.967 23 C P 40.629 -39.394 -8.690 O3' 44.615 -41.252 -7.346 1 2 ! ! ! SG1 1 2 SG2 8 8 SG3 17 18 1 0.000 0.000 2 0.000 13.306 3 0.000 26.613 4 0.000 48.790 5 0.000 70.968 6 0.000 93.145 7 0.000 115.323 8 0.000 137.500 9 0.000 204.032 10 0.000 226.210 11 0.000 248.387 12 0.000 270.565 13 0.000 292.742 14 0.000 314.919 15 0.000 337.097 16 0.000 359.274 17 0.000 381.452 18 0.000 425.806 19 0.000 447.984 20 0.000 470.161 21 0.000 492.339 22 0.000 514.516 23 0.000 536.694 1 22 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 UGCGUCA CACCGGUGAA GUCGC Crystallography ? ? Angstroms 1 U O3' 41.056 -42.127 8.403 2 G P 41.171 -40.813 9.330 O3' 45.484 -38.215 8.081 3 C P 45.090 -36.680 7.824 O3' 47.113 -34.140 4.314 4 G P 46.650 -32.626 4.100 O3' 45.672 -29.649 -0.442 5 U P 45.236 -28.208 0.151 O3' 42.266 -25.828 -2.716 6 C P 41.476 -24.451 -2.439 O3' 36.283 -22.800 -4.058 7 A P 35.997 -21.562 -3.067 O3' 31.333 -20.529 -1.882 8 C P 31.514 -19.357 -0.801 O3' 28.825 -18.330 3.207 9 A P 29.555 -17.055 3.838 O3' 29.855 -15.897 8.565 10 C P 30.723 -14.534 8.600 O3' 33.567 -13.556 12.865 11 C P 34.274 -12.173 12.462 O3' 38.758 -11.198 14.194 12 G P 39.404 -9.914 13.462 O3' 44.240 -8.988 12.425 13 G P 43.911 -7.715 11.501 O3' 47.960 -6.821 8.606 14 U P 47.789 -5.477 7.757 O3' 49.463 -4.056 3.368 15 G P 48.717 -2.657 3.085 O3' 47.583 -0.679 -1.311 16 A P 46.914 0.729 -1.005 O3' 42.158 2.652 -3.304 17 A P 41.529 2.297 -4.734 O3' 37.937 4.494 -7.808 18 G P 36.749 4.750 -6.792 O3' 32.152 3.094 -7.091 19 U P 31.304 4.198 -6.278 O3' 28.065 3.121 -2.264 20 C P 27.413 4.592 -2.187 O3' 26.924 7.157 2.252 21 G P 25.960 7.245 3.538 O3' 27.425 8.990 8.022 22 C P 28.028 10.475 8.161 O3' 31.868 12.217 12.327 1 2 ! ! ! SG1 1 1 SG2 7 7 SG3 16 17 1 53.226 550.000 2 53.226 536.694 3 53.226 514.516 4 53.226 492.339 5 53.226 470.161 6 53.226 447.984 7 53.226 403.629 8 53.226 359.274 9 53.226 337.097 10 53.226 314.919 11 53.226 292.742 12 53.226 270.565 13 53.226 248.387 14 53.226 226.210 15 53.226 204.032 16 53.226 181.855 17 53.226 159.677 18 53.226 115.323 19 53.226 93.145 20 53.226 70.968 21 53.226 48.790 22 53.226 26.613 3 22 + + c 4 21 + + c 5 20 + + c 6 19 W W c 7 18 + + c 9 15 + + c 10 14 - - c 11 13 + + c 12 12 + + c 13 11 + + c 14 10 + + c 15 9 - - c 16 8 + + c 19 6 + + c 20 5 W W c 21 4 + + c 22 3 + + c 23 2 + + c 3 22 5 9 15 8 19 6 5