1 29 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 GGAGUGCUUC AACAGUGCUU GGACGCUCC LOOP1 13 18 Crystallography ? ? Angstroms 1 G O3' -10.703 -16.595 11.498 2 G P -11.579 -15.243 11.550 O3' -13.076 -14.011 16.755 3 A P -13.994 -12.706 16.983 O3' -13.738 -10.181 21.471 4 G P -15.095 -9.313 21.435 O3' -14.496 -4.799 24.277 5 U P -16.065 -4.482 24.465 O3' -16.703 0.729 23.595 6 G P -17.938 0.570 24.619 O3' -22.569 1.676 20.948 7 C P -24.024 1.653 21.637 O3' -27.157 4.790 17.264 8 U P -28.545 4.425 16.531 O3' -29.410 4.352 10.713 9 U P -30.606 3.354 10.305 O3' -29.003 0.905 5.594 10 C P -30.472 0.382 5.186 O3' -30.872 -5.069 5.021 11 A P -31.991 -6.201 5.274 O3' -31.205 -11.647 7.360 12 A P -32.081 -12.643 8.275 O3' -31.786 -15.596 11.725 13 C P -33.320 -15.860 11.318 O3' -36.700 -15.229 16.067 14 A P -38.158 -15.475 15.424 O3' -41.357 -11.353 17.682 15 G P -42.638 -10.554 17.118 O3' -40.909 -4.740 18.437 16 U P -40.878 -4.088 19.909 O3' -36.276 -0.202 18.430 17 G P -36.129 0.619 19.809 O3' -35.783 -4.070 23.860 18 C P -35.372 -4.206 25.411 O3' -29.307 -3.757 24.713 19 U P -28.192 -4.349 25.717 O3' -27.183 -8.455 24.474 20 U P -25.685 -7.863 24.535 O3' -22.526 -8.391 20.083 21 G P -21.340 -7.334 19.812 O3' -18.737 -9.436 15.286 22 G P -17.290 -8.761 15.066 O3' -16.718 -6.909 9.736 23 A P -15.719 -5.731 9.276 O3' -17.100 -2.693 5.186 24 C P -15.875 -1.677 4.925 O3' -15.128 3.031 6.699 25 G P -13.517 3.106 6.713 O3' -11.769 5.300 11.504 26 C P -10.168 5.238 11.668 O3' -8.345 5.248 16.748 27 U P -6.821 5.463 16.274 O3' -3.772 1.268 18.161 28 C P -2.405 0.506 17.782 O3' -0.773 -4.558 19.199 29 C P 0.386 -5.570 18.719 O3' 0.242 -11.247 20.210 15 syn 1 29 + + c 2 28 + + c 3 27 - - c 4 26 + + c 5 25 W W c 6 24 + + c 8 23 - - c 9 22 W W c 11 20 - - c 12 19 - - c 13 17 + + c 6 23 ! ! ! 9 21 ! ! ! 1 29 6 8 23 2 11 20 2 SG1 7 7 SG2 10 10 SG3 13 18 SG4 21 21 1 15.435 0.000 2 15.435 37.651 3 15.435 75.302 4 15.435 112.953 5 15.435 150.604 6 15.435 188.256 7 15.435 225.907 8 15.435 263.558 9 15.435 301.209 10 15.435 338.860 11 15.435 414.162 12 15.435 451.813 13 0.000 487.944 14 9.889 525.968 15 40.971 550.000 16 80.261 550.000 17 111.343 525.968 18 121.232 487.944 19 105.797 451.813 20 105.797 414.162 21 105.797 376.511 22 105.797 301.209 23 105.797 263.558 24 105.797 188.256 25 105.797 150.604 26 105.797 112.953 27 105.797 75.302 28 105.797 37.651 29 105.797 0.000