1 21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 GGAUGCCUCC CGAGUGCAUC C LOOP1 7 15 Crystallography ? ? Angstroms 1 G O3' -30.370 -10.591 -17.657 2 G P -28.765 -10.736 -17.647 O3' -25.149 -8.314 -19.517 3 A P -23.905 -9.333 -19.418 O3' -19.247 -6.973 -19.542 4 U P -17.799 -7.675 -19.582 O3' -13.683 -4.331 -17.726 5 G P -12.098 -4.494 -17.488 O3' -9.193 -1.798 -13.982 6 C P -7.620 -1.925 -14.302 O3' -5.346 -3.270 -9.257 7 C P -3.783 -3.088 -8.918 O3' 0.556 -6.734 -8.101 8 U P 2.004 -6.487 -8.761 O3' 4.956 -5.519 -12.517 9 C P 6.112 -6.629 -12.676 O3' 11.209 -5.044 -12.578 10 C P 11.001 -5.582 -14.081 O3' 13.125 -10.835 -13.126 11 C P 13.039 -12.084 -14.138 O3' 10.875 -17.457 -13.253 12 G P 9.598 -17.341 -14.230 O3' 6.267 -19.653 -13.051 13 A P 5.539 -18.855 -11.858 O3' 1.642 -20.791 -14.665 14 G P 0.717 -20.619 -15.973 O3' -2.446 -21.407 -10.959 15 U P -2.423 -22.892 -10.337 O3' -7.390 -22.472 -8.866 16 G P -7.263 -21.435 -10.091 O3' -10.439 -18.330 -6.937 17 C P -11.977 -17.870 -7.069 O3' -13.869 -13.795 -3.676 18 A P -15.416 -13.349 -3.645 O3' -16.828 -8.761 -2.241 19 U P -18.423 -8.576 -2.129 O3' -19.971 -3.407 -3.217 20 C P -21.416 -2.722 -3.413 O3' -22.070 1.301 -7.230 21 C P -23.381 2.143 -7.636 O3' -25.272 3.259 -12.201 12 syn 1 21 + + c 2 20 + + c 3 19 - - c 4 18 - - c 5 17 + + c 6 16 + + c 7 14 + + c 1 21 6 SG1 7 15 1 51.671 0.000 2 51.671 63.687 3 51.671 127.373 4 51.671 191.060 5 51.671 254.747 6 51.671 318.433 7 11.519 367.797 8 0.000 430.377 9 19.942 490.802 10 66.448 534.232 11 128.095 550.000 12 189.741 534.232 13 236.247 490.802 14 256.189 430.377 15 244.670 367.797 16 204.519 318.433 17 204.519 254.747 18 204.519 191.060 19 204.519 127.373 20 204.519 63.687 21 204.519 0.000