HEADER SPLICING 31-DEC-69 6AHD TITLE The Cryo-EM Structure of Human Pre-catalytic Spliceosome (B complex) TITLE 2 at 3.8 angstrom resolution COMPND MOL_ID: 49; COMPND 2 MOLECULE: Brr2, U5 small nuclear ribonucleoprotein 200 kDa helicase; COMPND 3 CHAIN: D; EXPDTA ELECTRON MICROSCOPY DBREF 6AHD D 1 2136 UNP O75643 U520_HUMAN 1 2136 SEQRES 1 D 55 MET CYS PRO LEU ARG GLN PHE ARG LYS LEU PRO GLU GLU SEQRES 2 D 55 VAL VAL LYS LYS ILE GLU LYS LYS ASN PHE PRO PHE GLU SEQRES 3 D 55 ARG LEU TYR ASP LEU ASN HIS ASN GLU ILE GLY GLU LEU SEQRES 4 D 55 ILE ARG MET PRO LYS MET GLY LYS THR ILE HIS LYS TYR SEQRES 5 D 55 VAL HIS LEU ATOM 1 N MET D1126 201.216 242.003 246.588 1.00146.09 ATOM 2 CA MET D1126 201.584 241.086 245.532 1.00145.54 ATOM 3 C MET D1126 200.785 239.780 245.572 1.00141.71 ATOM 4 O MET D1126 200.419 239.277 246.639 1.00138.71 ATOM 5 N CYS D1127 200.520 239.257 244.376 1.00150.64 ATOM 6 CA CYS D1127 199.669 238.091 244.166 1.00147.73 ATOM 7 C CYS D1127 200.075 236.883 244.989 1.00143.74 ATOM 8 O CYS D1127 201.205 236.415 244.890 1.00143.68 ATOM 9 N PRO D1128 199.124 236.355 245.772 1.00145.01 ATOM 10 CA PRO D1128 199.301 235.215 246.677 1.00141.75 ATOM 11 C PRO D1128 199.875 233.998 245.967 1.00140.90 ATOM 12 O PRO D1128 200.513 233.158 246.605 1.00139.47 ATOM 13 N LEU D1129 199.643 233.918 244.659 1.00127.91 ATOM 14 CA LEU D1129 200.148 232.826 243.838 1.00128.59 ATOM 15 C LEU D1129 201.671 232.736 243.929 1.00130.36 ATOM 16 O LEU D1129 202.258 231.693 243.654 1.00131.30 ATOM 17 N ARG D1130 202.308 233.833 244.326 1.00149.00 ATOM 18 CA ARG D1130 203.753 233.844 244.502 1.00150.34 ATOM 19 C ARG D1130 204.250 232.940 245.624 1.00148.10 ATOM 20 O ARG D1130 205.393 232.503 245.595 1.00149.12 ATOM 21 N GLN D1131 203.418 232.653 246.616 1.00131.97 ATOM 22 CA GLN D1131 203.878 231.803 247.714 1.00132.53 ATOM 23 C GLN D1131 204.031 230.358 247.255 1.00133.04 ATOM 24 O GLN D1131 204.626 229.534 247.956 1.00134.28 ATOM 25 N PHE D1132 203.481 230.065 246.078 1.00144.48 ATOM 26 CA PHE D1132 203.755 228.813 245.393 1.00145.06 ATOM 27 C PHE D1132 204.928 229.129 244.494 1.00147.54 ATOM 28 O PHE D1132 204.756 229.749 243.445 1.00149.20 ATOM 29 N ARG D1133 206.113 228.647 244.839 1.00166.94 ATOM 30 CA ARG D1133 207.286 229.045 244.081 1.00169.69 ATOM 31 C ARG D1133 207.302 228.301 242.752 1.00171.21 ATOM 32 O ARG D1133 208.107 228.587 241.866 1.00173.96 ATOM 33 N LYS D1134 206.374 227.361 242.617 1.00169.70 ATOM 34 CA LYS D1134 206.303 226.491 241.453 1.00171.21 ATOM 35 C LYS D1134 205.944 227.300 240.197 1.00173.34 ATOM 36 O LYS D1134 206.133 226.840 239.067 1.00175.58 ATOM 37 N LEU D1135 205.462 228.520 240.412 1.00160.34 ATOM 38 CA LEU D1135 204.921 229.349 239.337 1.00162.79 ATOM 39 C LEU D1135 205.978 230.201 238.626 1.00166.50 ATOM 40 O LEU D1135 206.917 230.695 239.259 1.00166.76 ATOM 41 N PRO D1136 205.836 230.343 237.297 1.00160.13 ATOM 42 CA PRO D1136 206.608 231.261 236.449 1.00164.76 ATOM 43 C PRO D1136 206.443 232.718 236.854 1.00165.99 ATOM 44 O PRO D1136 205.331 233.133 237.168 1.00164.50 ATOM 45 N GLU D1137 207.530 233.484 236.824 1.00207.54 ATOM 46 CA GLU D1137 207.495 234.885 237.241 1.00209.23 ATOM 47 C GLU D1137 206.714 235.789 236.291 1.00213.36 ATOM 48 O GLU D1137 205.992 236.692 236.733 1.00213.06 ATOM 49 N GLU D1138 206.873 235.564 234.992 1.00203.52 ATOM 50 CA GLU D1138 206.246 236.436 234.008 1.00208.61 ATOM 51 C GLU D1138 204.730 236.296 234.048 1.00206.40 ATOM 52 O GLU D1138 204.003 237.262 233.819 1.00208.53 ATOM 53 N VAL D1139 204.258 235.089 234.362 1.00175.88 ATOM 54 CA VAL D1139 202.826 234.835 234.450 1.00173.68 ATOM 55 C VAL D1139 202.240 235.579 235.641 1.00169.84 ATOM 56 O VAL D1139 201.219 236.258 235.520 1.00170.09 ATOM 57 N VAL D1140 202.902 235.454 236.786 1.00157.94 ATOM 58 CA VAL D1140 202.508 236.180 237.986 1.00154.96 ATOM 59 C VAL D1140 202.449 237.688 237.726 1.00158.77 ATOM 60 O VAL D1140 201.420 238.333 237.970 1.00158.25 ATOM 61 N LYS D1141 203.545 238.241 237.207 1.00189.24 ATOM 62 CA LYS D1141 203.595 239.664 236.881 1.00193.74 ATOM 63 C LYS D1141 202.469 240.052 235.917 1.00196.53 ATOM 64 O LYS D1141 201.916 241.153 235.999 1.00198.61 ATOM 65 N LYS D1142 202.125 239.125 235.025 1.00195.99 ATOM 66 CA LYS D1142 201.068 239.339 234.034 1.00198.69 ATOM 67 C LYS D1142 199.691 239.435 234.687 1.00195.32 ATOM 68 O LYS D1142 198.885 240.289 234.315 1.00198.39 ATOM 69 N ILE D1143 199.414 238.555 235.645 1.00169.99 ATOM 70 CA ILE D1143 198.136 238.625 236.349 1.00167.32 ATOM 71 C ILE D1143 198.095 239.837 237.283 1.00167.85 ATOM 72 O ILE D1143 197.019 240.314 237.639 1.00168.12 ATOM 73 N GLU D1144 199.265 240.330 237.684 1.00169.21 ATOM 74 CA GLU D1144 199.326 241.537 238.505 1.00170.43 ATOM 75 C GLU D1144 199.084 242.781 237.652 1.00176.75 ATOM 76 O GLU D1144 198.577 243.793 238.142 1.00178.62 ATOM 77 N LYS D1145 199.451 242.689 236.374 1.00209.51 ATOM 78 CA LYS D1145 199.275 243.777 235.408 1.00216.30 ATOM 79 C LYS D1145 197.818 244.240 235.335 1.00217.93 ATOM 80 O LYS D1145 197.513 245.405 235.604 1.00221.54 ATOM 81 N LYS D1146 196.925 243.319 234.984 1.00203.52 ATOM 82 CA LYS D1146 195.493 243.578 235.039 1.00204.83 ATOM 83 C LYS D1146 195.063 243.397 236.483 1.00200.10 ATOM 84 O LYS D1146 195.457 242.430 237.126 1.00194.56 ATOM 85 N ASN D1147 194.251 244.308 237.007 1.00207.90 ATOM 86 CA ASN D1147 193.801 244.139 238.380 1.00204.06 ATOM 87 C ASN D1147 192.483 243.372 238.415 1.00202.81 ATOM 88 O ASN D1147 191.424 243.890 238.063 1.00207.34 ATOM 89 N PHE D1148 192.577 242.121 238.855 1.00207.52 ATOM 90 CA PHE D1148 191.445 241.203 238.920 1.00205.57 ATOM 91 C PHE D1148 191.466 240.465 240.252 1.00199.80 ATOM 92 O PHE D1148 192.147 239.445 240.372 1.00195.40 ATOM 93 N PRO D1149 190.733 240.980 241.252 1.00165.12 ATOM 94 CA PRO D1149 190.853 240.555 242.651 1.00159.88 ATOM 95 C PRO D1149 190.869 239.033 242.809 1.00154.30 ATOM 96 O PRO D1149 190.070 238.324 242.198 1.00154.11 ATOM 97 N PHE D1150 191.808 238.561 243.626 1.00178.90 ATOM 98 CA PHE D1150 192.202 237.152 243.681 1.00174.66 ATOM 99 C PHE D1150 191.063 236.179 243.980 1.00172.29 ATOM 100 O PHE D1150 190.959 235.127 243.347 1.00171.28 ATOM 101 N GLU D1151 190.209 236.536 244.932 1.00179.93 ATOM 102 CA GLU D1151 189.100 235.671 245.313 1.00178.21 ATOM 103 C GLU D1151 188.088 235.522 244.177 1.00180.76 ATOM 104 O GLU D1151 187.127 234.759 244.285 1.00180.00 ATOM 105 N ARG D1152 188.290 236.271 243.095 1.00173.28 ATOM 106 CA ARG D1152 187.431 236.158 241.922 1.00176.39 ATOM 107 C ARG D1152 187.962 235.121 240.927 1.00175.84 ATOM 108 O ARG D1152 187.418 234.960 239.837 1.00178.66 ATOM 109 N LEU D1153 189.028 234.422 241.300 1.00147.78 ATOM 110 CA LEU D1153 189.558 233.352 240.458 1.00147.35 ATOM 111 C LEU D1153 188.805 232.027 240.642 1.00145.41 ATOM 112 O LEU D1153 188.875 231.148 239.785 1.00145.97 ATOM 113 N TYR D1154 188.077 231.877 241.747 1.00166.14 ATOM 114 CA TYR D1154 187.380 230.617 242.007 1.00164.98 ATOM 115 C TYR D1154 186.168 230.434 241.101 1.00167.58 ATOM 116 O TYR D1154 185.764 229.307 240.802 1.00167.63 ATOM 117 N ASP D1155 185.588 231.542 240.655 1.00199.48 ATOM 118 CA ASP D1155 184.392 231.488 239.819 1.00202.54 ATOM 119 C ASP D1155 184.719 230.948 238.425 1.00204.50 ATOM 120 O ASP D1155 183.864 230.366 237.745 1.00206.43 ATOM 121 N LEU D1156 185.975 231.133 238.023 1.00183.40 ATOM 122 CA LEU D1156 186.415 230.842 236.661 1.00185.80 ATOM 123 C LEU D1156 186.933 229.414 236.492 1.00183.92 ATOM 124 O LEU D1156 187.623 228.884 237.367 1.00180.81 ATOM 125 N ASN D1157 186.593 228.797 235.363 1.00206.90 ATOM 126 CA ASN D1157 187.119 227.475 235.025 1.00206.01 ATOM 127 C ASN D1157 188.498 227.583 234.389 1.00206.52 ATOM 128 O ASN D1157 189.061 228.677 234.310 1.00207.44 ATOM 129 N HIS D1158 189.031 226.457 233.925 1.00197.36 ATOM 130 CA HIS D1158 190.410 226.416 233.444 1.00197.73 ATOM 131 C HIS D1158 190.626 227.331 232.237 1.00201.42 ATOM 132 O HIS D1158 191.710 227.892 232.049 1.00202.05 ATOM 133 N ASN D1159 189.584 227.483 231.427 1.00188.39 ATOM 134 CA ASN D1159 189.657 228.306 230.224 1.00192.68 ATOM 135 C ASN D1159 189.495 229.795 230.531 1.00193.93 ATOM 136 O ASN D1159 190.240 230.635 230.012 1.00196.43 ATOM 137 N GLU D1160 188.527 230.106 231.388 1.00194.06 ATOM 138 CA GLU D1160 188.200 231.484 231.738 1.00195.67 ATOM 139 C GLU D1160 189.367 232.183 232.419 1.00194.02 ATOM 140 O GLU D1160 189.495 233.404 232.355 1.00196.62 ATOM 141 N ILE D1161 190.212 231.398 233.076 1.00180.66 ATOM 142 CA ILE D1161 191.396 231.930 233.731 1.00179.07 ATOM 143 C ILE D1161 192.400 232.459 232.717 1.00182.49 ATOM 144 O ILE D1161 192.855 233.604 232.812 1.00184.30 ATOM 145 N GLY D1162 192.744 231.616 231.747 1.00215.31 ATOM 146 CA GLY D1162 193.749 231.957 230.758 1.00218.79 ATOM 147 C GLY D1162 193.333 233.118 229.876 1.00223.93 ATOM 148 O GLY D1162 194.179 233.789 229.278 1.00227.27 ATOM 149 N GLU D1163 192.026 233.359 229.808 1.00187.09 ATOM 150 CA GLU D1163 191.477 234.413 228.961 1.00192.63 ATOM 151 C GLU D1163 191.734 235.820 229.496 1.00194.39 ATOM 152 O GLU D1163 191.662 236.794 228.746 1.00199.78 ATOM 153 N LEU D1164 192.035 235.927 230.784 1.00187.60 ATOM 154 CA LEU D1164 192.301 237.223 231.394 1.00189.10 ATOM 155 C LEU D1164 193.642 237.781 230.950 1.00191.55 ATOM 156 O LEU D1164 193.739 238.928 230.513 1.00196.53 ATOM 157 N ILE D1165 194.676 236.960 231.073 1.00220.68 ATOM 158 CA ILE D1165 196.042 237.366 230.756 1.00222.93 ATOM 159 C ILE D1165 196.434 237.023 229.315 1.00227.13 ATOM 160 O ILE D1165 197.593 237.181 228.927 1.00229.50 ATOM 161 N ARG D1166 195.457 236.534 228.548 1.00233.92 ATOM 162 CA ARG D1166 195.631 236.069 227.165 1.00237.79 ATOM 163 C ARG D1166 196.772 235.058 226.991 1.00236.15 ATOM 164 O ARG D1166 197.381 234.953 225.923 1.00240.24 ATOM 165 N MET D1167 197.025 234.292 228.049 1.00197.64 ATOM 166 CA MET D1167 197.998 233.209 228.013 1.00195.88 ATOM 167 C MET D1167 197.282 231.902 228.341 1.00191.62 ATOM 168 O MET D1167 197.415 231.379 229.447 1.00187.07 ATOM 169 N PRO D1168 196.516 231.373 227.373 1.00184.63 ATOM 170 CA PRO D1168 195.626 230.227 227.595 1.00181.51 ATOM 171 C PRO D1168 196.377 228.919 227.848 1.00178.82 ATOM 172 O PRO D1168 195.829 228.020 228.484 1.00175.39 ATOM 173 N LYS D1169 197.607 228.821 227.360 1.00186.92 ATOM 174 CA LYS D1169 198.410 227.617 227.560 1.00185.00 ATOM 175 C LYS D1169 198.649 227.382 229.055 1.00180.16 ATOM 176 O LYS D1169 198.842 226.248 229.499 1.00177.68 ATOM 177 N MET D1170 198.617 228.459 229.825 1.00197.18 ATOM 178 CA MET D1170 198.817 228.390 231.266 1.00192.97 ATOM 179 C MET D1170 197.538 228.041 232.025 1.00189.75 ATOM 180 O MET D1170 197.585 227.648 233.200 1.00186.32 ATOM 181 N GLY D1171 196.407 228.157 231.333 1.00195.97 ATOM 182 CA GLY D1171 195.088 228.106 231.946 1.00193.90 ATOM 183 C GLY D1171 194.832 226.976 232.926 1.00190.21 ATOM 184 O GLY D1171 194.200 227.184 233.964 1.00187.79 ATOM 185 N LYS D1172 195.318 225.782 232.604 1.00174.68 ATOM 186 CA LYS D1172 195.151 224.635 233.489 1.00171.90 ATOM 187 C LYS D1172 195.993 224.793 234.751 1.00169.16 ATOM 188 O LYS D1172 195.474 224.713 235.872 1.00166.70 ATOM 189 N THR D1173 197.291 225.044 234.563 1.00174.63 ATOM 190 CA THR D1173 198.247 225.063 235.672 1.00172.47 ATOM 191 C THR D1173 197.896 226.106 236.724 1.00170.67 ATOM 192 O THR D1173 197.874 225.799 237.925 1.00168.04 ATOM 193 N ILE D1174 197.606 227.323 236.268 1.00157.71 ATOM 194 CA ILE D1174 197.138 228.385 237.152 1.00156.41 ATOM 195 C ILE D1174 196.014 227.853 238.020 1.00153.94 ATOM 196 O ILE D1174 196.064 227.956 239.249 1.00151.54 ATOM 197 N HIS D1175 195.030 227.236 237.367 1.00154.02 ATOM 198 CA HIS D1175 193.856 226.740 238.060 1.00152.30 ATOM 199 C HIS D1175 194.259 225.845 239.219 1.00149.86 ATOM 200 O HIS D1175 193.736 226.004 240.326 1.00148.04 ATOM 201 N LYS D1176 195.219 224.953 238.979 1.00162.01 ATOM 202 CA LYS D1176 195.675 224.030 240.016 1.00160.20 ATOM 203 C LYS D1176 196.037 224.829 241.256 1.00158.15 ATOM 204 O LYS D1176 195.472 224.614 242.338 1.00156.65 ATOM 205 N TYR D1177 196.929 225.802 241.077 1.00165.81 ATOM 206 CA TYR D1177 197.376 226.628 242.192 1.00164.18 ATOM 207 C TYR D1177 196.239 227.364 242.876 1.00163.17 ATOM 208 O TYR D1177 196.229 227.466 244.102 1.00161.39 ATOM 209 N VAL D1178 195.284 227.866 242.097 1.00127.70 ATOM 210 CA VAL D1178 194.233 228.666 242.695 1.00126.88 ATOM 211 C VAL D1178 193.447 227.784 243.648 1.00126.87 ATOM 212 O VAL D1178 192.974 228.249 244.688 1.00126.30 ATOM 213 N HIS D1179 193.355 226.498 243.326 1.00135.81 ATOM 214 CA HIS D1179 192.616 225.592 244.193 1.00135.28 ATOM 215 C HIS D1179 193.513 224.904 245.215 1.00134.44 ATOM 216 O HIS D1179 193.036 224.205 246.108 1.00134.48 ATOM 217 N LEU D1180 194.820 225.107 245.075 1.00135.66 ATOM 218 CA LEU D1180 195.776 224.645 246.074 1.00134.48 ATOM 219 C LEU D1180 195.871 225.624 247.233 1.00133.25 ATOM 220 O LEU D1180 196.247 225.256 248.347 1.00132.45 TER