1 19 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 GGCACCUCCU CGCGGUGCC LOOP1 8 12 Crystallography ? ? Angstroms 1 G O3' 34.702 -6.497 6.082 2 G P 33.562 -5.559 6.707 O3' 35.105 -2.794 11.388 3 C P 33.952 -1.798 11.900 O3' 35.728 2.971 14.354 4 A P 34.399 3.751 14.805 O3' 34.529 9.329 14.678 5 C P 33.021 9.786 15.009 O3' 31.050 14.237 12.274 6 C P 29.534 14.337 12.806 O3' 25.729 15.958 8.925 7 U P 24.145 15.844 9.203 O3' 21.541 13.531 4.996 8 C P 19.976 13.817 5.250 O3' 17.258 9.125 4.899 9 C P 15.710 9.556 4.823 O3' 12.875 7.839 9.415 10 U P 11.353 8.180 9.812 O3' 10.127 4.994 5.100 11 C P 11.190 4.267 4.116 O3' 15.246 1.010 6.739 12 G P 15.780 -0.465 6.365 O3' 21.606 -1.753 6.015 13 C P 22.552 -2.844 6.727 O3' 24.925 -0.316 3.128 14 G P 26.480 -0.239 2.721 O3' 27.090 3.962 -1.018 15 G P 28.624 3.825 -1.500 O3' 31.589 8.472 -2.539 16 U P 33.115 8.014 -2.773 O3' 37.120 11.623 -1.271 17 G P 38.482 10.860 -1.636 O3' 42.366 10.841 2.379 18 C P 43.610 9.917 1.953 O3' 45.867 6.984 6.126 19 C P 47.025 5.958 5.706 O3' 47.715 1.691 9.433 1 19 + + c 2 18 + + c 3 17 + + c 4 16 - - c 5 15 + + c 6 14 + + c 7 13 W W c 1 19 7 SG1 8 12 1 176.347 0.000 2 176.347 65.476 3 176.347 130.952 4 176.347 196.429 5 176.347 261.905 6 176.347 327.381 7 176.347 392.857 8 195.550 461.063 9 163.862 524.440 10 97.775 550.000 11 31.688 524.440 12 0.000 461.063 13 19.204 392.857 14 19.204 327.381 15 19.204 261.905 16 19.204 196.429 17 19.204 130.952 18 19.204 65.476 19 19.204 0.000