1 22 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 GGCCGAAAUC CCGAAGUAGG CC LOOP1 7 16 Crystallography ? ? Angstroms 1 G O3' 59.474 -26.161 101.166 2 G P 60.173 -25.156 100.123 O3' 58.667 -21.461 96.619 3 C P 58.774 -20.151 95.689 O3' 54.664 -16.762 94.093 4 C P 53.058 -16.869 94.045 O3' 52.159 -11.927 93.557 5 G P 50.758 -11.102 93.533 O3' 50.794 -6.327 95.997 6 A P 50.011 -5.773 94.704 O3' 48.839 -1.381 97.102 7 A P 48.840 0.151 96.609 O3' 48.819 3.741 100.725 8 A P 48.997 5.310 101.020 O3' 51.581 8.599 104.841 9 U P 50.277 9.414 104.354 O3' 51.037 11.973 100.614 10 C P 51.438 10.901 99.482 O3' 53.896 15.130 96.496 11 C P 55.322 15.514 95.850 O3' 60.458 13.327 96.992 12 C P 61.604 13.885 97.983 O3' 64.991 9.186 99.798 13 G P 66.449 8.515 99.687 O3' 65.882 4.190 103.373 14 A P 64.274 4.121 103.455 O3' 60.803 0.712 104.058 15 A P 61.845 -0.392 104.590 O3' 63.878 -1.958 99.573 16 G P 65.299 -2.629 99.922 O3' 62.673 -5.855 100.218 17 U P 63.237 -6.834 101.364 O3' 60.037 -6.420 106.315 18 A P 58.866 -7.319 106.957 O3' 54.717 -6.259 109.602 19 G P 53.654 -7.378 110.055 O3' 48.358 -7.794 108.646 20 G P 47.348 -9.042 108.770 O3' 45.141 -10.970 103.751 21 C P 44.088 -12.162 103.492 O3' 44.222 -15.945 99.931 22 C P 43.253 -17.190 100.255 O3' 44.563 -22.818 99.641 9 syn 12 syn 13 syn 1 22 + + c 2 21 + + c 3 20 + + c 4 19 + + c 5 18 S H t 6 17 H W t 7 15 H H t 16 17 ! ! ! 15 16 ! ! ! 1 22 6 SG1 7 16 1 207.526 0.000 2 207.526 61.761 3 207.526 123.522 4 207.526 185.283 5 207.526 247.044 6 207.526 308.805 7 249.461 353.760 8 266.826 412.734 9 255.945 473.242 10 219.122 522.471 11 164.152 550.000 12 102.674 550.000 13 47.705 522.471 14 10.881 473.242 15 0.000 412.734 16 17.365 353.760 17 59.300 308.805 18 59.300 247.044 19 59.300 185.283 20 59.300 123.522 21 59.300 61.761 22 59.300 0.000