1 27 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 GGAAGUCCGG UCUUCGGACC GGCUUCC LOOP1 12 17 Crystallography ? ? Angstroms 1 G O3' 10.559 -8.106 -27.893 2 G P 9.052 -8.457 -27.443 O3' 8.617 -11.948 -22.918 3 A P 7.231 -12.272 -22.164 O3' 6.062 -11.941 -17.244 4 A P 4.486 -12.150 -16.989 O3' 2.747 -9.448 -12.448 5 G P 1.230 -9.605 -11.923 O3' -1.447 -4.414 -10.144 6 U P -1.201 -4.510 -8.555 O3' -5.513 -3.395 -9.796 7 C P -5.974 -4.898 -9.452 O3' -10.428 -5.265 -10.490 8 C P -10.792 -6.805 -10.789 O3' -14.503 -8.771 -13.876 9 G P -14.453 -10.378 -13.957 O3' -16.115 -12.526 -18.595 10 G P -16.059 -14.124 -18.784 O3' -15.103 -16.300 -23.347 11 U P -15.281 -17.878 -23.077 O3' -12.810 -21.861 -25.673 12 C P -12.605 -23.373 -25.150 O3' -9.606 -26.735 -24.397 13 U P -10.566 -27.715 -23.552 O3' -9.647 -29.313 -18.469 14 U P -10.884 -29.954 -17.657 O3' -8.001 -32.277 -13.315 15 C P -7.291 -32.211 -11.872 O3' -5.189 -26.629 -10.780 16 G P -5.773 -25.369 -9.966 O3' -1.507 -22.266 -11.440 17 G P -1.554 -20.666 -11.625 O3' 2.332 -20.086 -15.191 18 A P 2.583 -18.732 -16.029 O3' 2.217 -18.254 -21.322 19 C P 2.384 -16.722 -21.794 O3' -0.171 -14.633 -25.572 20 C P 0.160 -13.059 -25.522 O3' -2.728 -9.438 -27.069 21 G P -2.164 -8.015 -26.571 O3' -5.584 -3.948 -26.671 22 G P -4.412 -2.851 -26.547 O3' -6.340 1.879 -24.741 23 C P -4.954 2.662 -24.978 O3' -2.789 5.274 -20.689 24 U P -1.321 5.633 -21.241 O3' 2.720 5.382 -17.345 25 U P 4.288 5.396 -17.707 O3' 7.301 3.199 -13.553 26 C P 8.873 3.460 -13.786 O3' 12.566 0.425 -13.148 27 C P 13.711 1.413 -13.704 O3' 18.457 0.117 -16.607 15 syn 16 syn 1 27 W W c 2 26 + + c 3 25 - - c 4 24 - - c 5 23 + + c 7 22 + + c 8 21 + + c 9 20 + + c 10 19 + + c 11 18 - - c 12 17 W W c 13 16 S W t 12 16 ! ! ! 13 14 ! ! ! 1 27 5 7 22 5 SG1 6 6 SG2 12 17 1 17.883 0.000 2 17.883 43.624 3 17.883 87.248 4 17.883 130.871 5 17.883 174.495 6 17.883 218.119 7 17.883 261.743 8 17.883 305.367 9 17.883 348.990 10 17.883 392.614 11 17.883 436.238 12 0.000 478.100 13 11.458 522.156 14 47.471 550.000 15 92.992 550.000 16 129.005 522.156 17 140.463 478.100 18 122.580 436.238 19 122.580 392.614 20 122.580 348.990 21 122.580 305.367 22 122.580 261.743 23 122.580 174.495 24 122.580 130.871 25 122.580 87.248 26 122.580 43.624 27 122.580 0.000