HEADER SPLICING 31-DEC-69 5O9Z TITLE Cryo-EM structure of a pre-catalytic human spliceosome primed for TITLE 2 activation (B complex) COMPND MOL_ID: 34; COMPND 2 MOLECULE: Splicing factor 3B subunit 3 (SF3B3); COMPND 3 CHAIN: w; EXPDTA ELECTRON MICROSCOPY DBREF 5O9Z w 1 1217 UNP Q15393 SF3B3_HUMAN 1 1217 SEQRES 1 w 85 THR SER HIS GLU ASP HIS ASP PHE PHE GLN HIS VAL GLU SEQRES 2 w 85 MET HIS LEU ARG SER GLU HIS PRO PRO LEU CYS GLY ARG SEQRES 3 w 85 ASP HIS LEU SER PHE ARG SER TYR TYR PHE PRO VAL LYS SEQRES 4 w 85 ASN VAL ILE ASP GLY ASP LEU CYS GLU GLN PHE ASN SER SEQRES 5 w 85 MET GLU PRO ASN LYS GLN LYS ASN VAL SER GLU GLU LEU SEQRES 6 w 85 ASP ARG THR PRO PRO GLU VAL SER LYS LYS LEU GLU ASP SEQRES 7 w 85 ILE ARG THR ARG TYR ALA PHE ATOM 1 CA THR w1133 246.303 186.208 250.288 1.00 50.00 ATOM 2 CA SER w1134 249.860 187.480 250.864 1.00 50.00 ATOM 3 CA HIS w1135 253.392 186.199 250.369 1.00 50.00 ATOM 4 CA GLU w1136 254.214 187.011 254.000 1.00 50.00 ATOM 5 CA ASP w1137 251.583 184.471 255.028 1.00 50.00 ATOM 6 CA HIS w1138 252.794 181.984 252.409 1.00 50.00 ATOM 7 CA ASP w1139 256.312 182.074 253.873 1.00 50.00 ATOM 8 CA PHE w1140 254.990 181.950 257.440 1.00 50.00 ATOM 9 CA PHE w1141 252.962 178.773 256.941 1.00 50.00 ATOM 10 CA GLN w1142 255.623 177.196 254.724 1.00 50.00 ATOM 11 CA HIS w1143 258.143 177.693 257.535 1.00 50.00 ATOM 12 CA VAL w1144 255.675 176.219 260.028 1.00 50.00 ATOM 13 CA GLU w1145 255.501 173.167 257.758 1.00 50.00 ATOM 14 CA MET w1146 259.289 172.843 257.517 1.00 50.00 ATOM 15 CA HIS w1147 259.546 173.099 261.310 1.00 50.00 ATOM 16 CA LEU w1148 256.814 170.636 262.278 1.00 50.00 ATOM 17 CA ARG w1149 258.224 168.197 259.728 1.00 50.00 ATOM 18 CA SER w1150 261.421 167.919 261.769 1.00 50.00 ATOM 19 CA GLU w1151 259.934 168.454 265.246 1.00 50.00 ATOM 20 CA HIS w1152 256.677 166.492 264.734 1.00 50.00 ATOM 21 CA PRO w1153 257.442 163.711 262.259 1.00 50.00 ATOM 22 CA PRO w1154 254.460 161.564 261.267 1.00 50.00 ATOM 23 CA LEU w1155 253.527 159.089 263.970 1.00 50.00 ATOM 24 CA CYS w1156 254.101 155.982 261.825 1.00 50.00 ATOM 25 CA GLY w1157 257.693 156.550 260.745 1.00 50.00 ATOM 26 CA ARG w1158 256.511 158.141 257.505 1.00 50.00 ATOM 27 CA ASP w1159 258.212 161.157 255.942 1.00 50.00 ATOM 28 CA HIS w1160 255.752 164.013 255.498 1.00 50.00 ATOM 29 CA LEU w1161 257.284 165.572 252.381 1.00 50.00 ATOM 30 CA SER w1162 257.433 162.141 250.737 1.00 50.00 ATOM 31 CA PHE w1163 253.842 161.341 251.734 1.00 50.00 ATOM 32 CA ARG w1164 252.497 164.488 250.111 1.00 50.00 ATOM 33 CA SER w1165 254.793 163.685 247.149 1.00 50.00 ATOM 34 CA TYR w1166 253.508 160.117 246.790 1.00 50.00 ATOM 35 CA TYR w1167 253.136 160.224 242.996 1.00 50.00 ATOM 36 CA PHE w1168 254.078 163.780 241.994 1.00 50.00 ATOM 37 CA PRO w1169 256.353 166.116 243.972 1.00 50.00 ATOM 38 CA VAL w1170 254.193 168.492 245.983 1.00 50.00 ATOM 39 CA LYS w1171 253.860 171.818 244.182 1.00 50.00 ATOM 40 CA ASN w1172 252.462 174.904 245.927 1.00 50.00 ATOM 41 CA VAL w1173 250.465 173.269 248.729 1.00 50.00 ATOM 42 CA ILE w1174 250.907 173.503 252.510 1.00 50.00 ATOM 43 CA ASP w1175 249.632 170.777 254.831 1.00 50.00 ATOM 44 CA GLY w1176 247.300 172.668 257.135 1.00 50.00 ATOM 45 CA ASP w1177 246.486 169.445 258.960 1.00 50.00 ATOM 46 CA LEU w1178 250.178 169.243 259.842 1.00 50.00 ATOM 47 CA CYS w1179 250.518 172.933 260.713 1.00 50.00 ATOM 48 CA GLU w1180 247.612 172.765 263.152 1.00 50.00 ATOM 49 CA GLN w1181 249.438 169.977 264.997 1.00 50.00 ATOM 50 CA PHE w1182 251.526 172.858 266.344 1.00 50.00 ATOM 51 CA ASN w1183 248.867 173.041 269.062 1.00 50.00 ATOM 52 CA SER w1184 249.743 169.477 270.129 1.00 50.00 ATOM 53 CA MET w1185 253.522 169.771 270.507 1.00 50.00 ATOM 54 CA GLU w1186 255.013 170.116 273.963 1.00 50.00 ATOM 55 CA PRO w1187 255.236 173.707 275.263 1.00 50.00 ATOM 56 CA ASN w1188 259.027 173.642 274.888 1.00 50.00 ATOM 57 CA LYS w1189 258.632 172.771 271.208 1.00 50.00 ATOM 58 CA GLN w1190 255.938 175.408 270.709 1.00 50.00 ATOM 59 CA LYS w1191 258.281 177.967 272.271 1.00 50.00 ATOM 60 CA ASN w1192 261.251 176.909 270.134 1.00 50.00 ATOM 61 CA VAL w1193 259.339 176.882 266.841 1.00 50.00 ATOM 62 CA SER w1194 257.498 180.126 267.564 1.00 50.00 ATOM 63 CA GLU w1195 260.726 181.855 268.615 1.00 50.00 ATOM 64 CA GLU w1196 262.259 180.744 265.316 1.00 50.00 ATOM 65 CA LEU w1197 259.351 182.581 263.667 1.00 50.00 ATOM 66 CA ASP w1198 259.698 185.533 266.082 1.00 50.00 ATOM 67 CA ARG w1199 256.302 184.783 267.615 1.00 50.00 ATOM 68 CA THR w1200 254.709 183.179 270.645 1.00 50.00 ATOM 69 CA PRO w1201 252.742 179.923 270.586 1.00 50.00 ATOM 70 CA PRO w1202 249.490 181.858 271.122 1.00 50.00 ATOM 71 CA GLU w1203 250.403 183.948 268.076 1.00 50.00 ATOM 72 CA VAL w1204 251.064 180.925 265.877 1.00 50.00 ATOM 73 CA SER w1205 247.814 179.303 267.020 1.00 50.00 ATOM 74 CA LYS w1206 245.858 182.479 266.271 1.00 50.00 ATOM 75 CA LYS w1207 247.273 182.941 262.777 1.00 50.00 ATOM 76 CA LEU w1208 246.368 179.291 262.168 1.00 50.00 ATOM 77 CA GLU w1209 242.821 179.988 263.378 1.00 50.00 ATOM 78 CA ASP w1210 242.491 182.952 261.013 1.00 50.00 ATOM 79 CA ILE w1211 242.466 180.709 257.939 1.00 50.00 ATOM 80 CA ARG w1212 239.467 178.822 259.309 1.00 50.00 ATOM 81 CA THR w1213 237.804 182.107 260.284 1.00 50.00 ATOM 82 CA ARG w1214 238.232 183.339 256.708 1.00 50.00 ATOM 83 CA TYR w1215 237.251 180.221 254.727 1.00 50.00 ATOM 84 CA ALA w1216 235.648 177.796 257.201 1.00 50.00 ATOM 85 CA PHE w1217 233.647 177.997 260.440 1.00 50.00 TER