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 GGCAAUGAAG CGCGCACGUU GCC Crystallography ? ? Angstroms 1 G O3' 24.363 11.093 -17.495 2 G P 23.234 11.829 -18.358 O3' 24.082 14.548 -22.612 3 C P 22.649 15.148 -22.974 O3' 20.921 15.570 -27.779 4 A P 19.355 15.846 -27.885 O3' 17.000 14.973 -32.350 5 A P 15.426 15.212 -32.299 O3' 12.451 12.812 -35.709 6 U P 10.963 13.368 -35.522 O3' 6.780 9.870 -35.510 7 G P 5.429 10.342 -34.724 O3' 4.071 6.097 -30.736 8 A P 2.684 5.430 -30.435 O3' -1.190 6.173 -27.726 9 A P -2.009 5.322 -28.833 O3' -2.101 8.370 -32.155 10 G P -0.984 9.353 -31.619 O3' 0.159 13.239 -34.950 11 C P 1.274 14.299 -34.551 O3' 0.966 18.817 -36.127 12 G P 2.112 19.268 -35.117 O3' 2.504 24.031 -33.585 13 C P 3.690 23.798 -32.539 O3' 3.783 25.539 -28.275 14 G P 5.191 24.827 -28.062 O3' 7.001 23.690 -23.435 15 C P 7.897 22.374 -23.660 O3' 7.826 18.330 -19.844 16 A P 8.565 16.971 -20.254 O3' 7.109 12.150 -19.807 17 C P 7.750 10.765 -20.311 O3' 6.479 6.075 -20.155 18 G P 7.816 5.334 -20.619 O3' 7.311 1.076 -23.665 19 U P 8.757 0.439 -23.547 O3' 11.541 -1.108 -27.319 20 U P 13.021 -1.387 -26.807 O3' 16.930 -1.293 -30.175 21 G P 18.366 -1.524 -29.523 O3' 22.446 -0.038 -32.424 22 C P 23.869 -0.428 -31.841 O3' 28.057 2.488 -32.665 23 C P 29.241 1.896 -31.768 O3' 32.365 4.801 -28.671 1 23 + + c 2 22 + + c 3 21 + + c 4 20 - - c 5 19 - - c 6 18 W W c 7 17 S W c 1 23 7 SG1 8 8 SG2 11 12 1 409.211 0.000 2 409.211 34.492 3 409.211 68.983 4 409.211 103.475 5 409.211 137.966 6 409.211 172.458 7 409.211 206.950 8 429.906 206.950 9 287.111 449.297 10 319.224 436.709 11 326.431 420.798 12 326.431 400.103 13 326.431 379.408 14 326.431 344.916 15 326.431 310.425 16 326.431 275.933 17 326.431 206.950 18 326.431 172.458 19 326.431 137.966 20 326.431 103.475 21 326.431 68.983 22 326.431 34.492 23 326.431 0.000 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 GGCAAUG AAGCGCGCAC GUUGCC Crystallography ? ? Angstroms 1 G O3' -30.960 10.462 -37.752 2 G P -29.854 11.215 -36.874 O3' -30.806 13.961 -32.659 3 C P -29.386 14.575 -32.276 O3' -27.753 15.052 -27.441 4 A P -26.192 15.343 -27.308 O3' -23.916 14.526 -22.792 5 A P -22.344 14.778 -22.815 O3' -19.416 12.431 -19.329 6 U P -17.928 12.999 -19.491 O3' -13.718 9.537 -19.395 7 G P -12.355 10.014 -20.158 O3' -10.884 5.749 -24.084 8 A P -9.487 5.090 -24.352 O3' -5.569 5.845 -26.993 9 A P -4.763 5.009 -25.863 O3' -4.761 8.085 -22.565 10 G P -5.876 9.055 -23.131 O3' -7.116 12.958 -19.856 11 C P -8.230 14.005 -20.285 O3' -7.991 18.538 -18.741 12 G P -9.122 18.972 -19.776 O3' -9.524 23.717 -21.354 13 C P -10.687 23.465 -22.422 O3' -10.713 25.171 -26.701 14 G P -12.111 24.445 -26.935 O3' -13.822 23.255 -31.586 15 C P -14.710 21.933 -31.368 O3' -14.532 17.860 -35.147 16 A P -15.268 16.497 -34.741 O3' -13.763 11.685 -35.120 17 C P -14.402 10.299 -34.616 O3' -13.089 5.619 -34.709 18 G P -14.429 4.871 -34.265 O3' -13.946 0.642 -31.175 19 U P -15.385 -0.008 -31.314 O3' -18.228 -1.549 -27.583 20 U P -19.695 -1.844 -28.122 O3' -23.668 -1.755 -24.830 21 G P -25.089 -2.005 -25.507 O3' -29.237 -0.529 -22.697 22 C P -30.645 -0.937 -23.304 O3' -34.874 1.950 -22.584 23 C P -36.034 1.340 -23.500 O3' -39.123 4.193 -26.681 1 23 + + c 2 22 + + c 3 21 + + c 4 20 - - c 5 19 - - c 6 18 W W c 7 17 S W c 1 23 7 SG1 8 8 SG2 13 14 1 30.211 550.000 2 62.324 537.412 3 94.436 524.824 4 126.549 512.236 5 158.661 499.648 6 190.774 487.060 7 222.886 474.472 8 429.906 275.933 9 409.211 275.933 10 409.211 310.425 11 409.211 344.916 12 409.211 379.408 13 409.211 400.103 14 409.211 420.798 15 289.013 359.639 16 256.900 372.226 17 192.675 397.402 18 160.563 409.990 19 128.450 422.578 20 96.338 435.166 21 64.225 447.754 22 32.113 460.342 23 0.000 472.930 9 16 W S c 10 14 W W c 10 15 + + c 13 12 + + c 14 11 + + c 15 10 + + c 16 9 ! ! ! 13 12 4 9 16 2