HEADER SPLICING 31-DEC-69 6AH0 TITLE The Cryo-EM Structure of the Precusor of Human Pre-catalytic TITLE 2 Spliceosome (pre-B complex) COMPND MOL_ID: 2; COMPND 2 MOLECULE: U5 small nuclear ribonucleoprotein 200 kDa helicase; COMPND 3 CHAIN: D; COMPND 4 EC: 3.6.4.13; EXPDTA ELECTRON MICROSCOPY DBREF 6AH0 D 1 2136 UNP O75643 U520_HUMAN 1 2136 SEQRES 1 D 2 HIS GLU SEQRES 1 D 32 ARG CYS GLN LEU PRO ASP GLY SER PHE ARG ARG GLN ARG SEQRES 2 D 32 LYS GLY TYR GLU GLU VAL HIS VAL PRO ALA LEU LYS PRO SEQRES 3 D 32 LYS PRO PHE GLY SER GLU ATOM 1 N HIS D 364 214.708 304.568 265.036 1.00 7.55 ATOM 2 CA HIS D 364 215.598 305.377 264.235 1.00 9.93 ATOM 3 C HIS D 364 217.037 305.417 264.733 1.00 12.34 ATOM 4 O HIS D 364 217.947 305.837 264.007 1.00 15.53 ATOM 5 N GLU D 365 217.267 304.986 265.956 1.00 14.04 ATOM 6 CA GLU D 365 218.570 305.053 266.603 1.00 16.41 ATOM 7 C GLU D 365 218.772 306.365 267.325 1.00 22.62 ATOM 8 O GLU D 365 218.062 307.335 267.103 1.00 27.32 TER ATOM 1 N ARG D 427 244.198 278.646 354.722 1.00198.72 ATOM 2 CA ARG D 427 244.426 278.670 356.170 1.00199.53 ATOM 3 C ARG D 427 243.318 277.951 356.957 1.00198.45 ATOM 4 O ARG D 427 242.135 278.036 356.605 1.00197.52 ATOM 5 N CYS D 428 243.715 277.246 358.019 1.00185.11 ATOM 6 CA CYS D 428 242.775 276.485 358.846 1.00184.28 ATOM 7 C CYS D 428 242.860 276.887 360.315 1.00185.69 ATOM 8 O CYS D 428 243.633 277.774 360.676 1.00187.21 ATOM 9 N GLN D 429 242.077 276.219 361.158 1.00167.24 ATOM 10 CA GLN D 429 241.954 276.598 362.562 1.00169.40 ATOM 11 C GLN D 429 242.044 275.399 363.519 1.00169.76 ATOM 12 O GLN D 429 241.722 274.273 363.173 1.00167.95 ATOM 13 N LEU D 430 242.512 275.654 364.729 1.00180.19 ATOM 14 CA LEU D 430 242.456 274.661 365.784 1.00180.31 ATOM 15 C LEU D 430 240.994 274.567 366.203 1.00179.85 ATOM 16 O LEU D 430 240.209 275.470 365.916 1.00179.84 ATOM 17 N PRO D 431 240.596 273.446 366.816 1.00184.66 ATOM 18 CA PRO D 431 239.533 273.572 367.823 1.00185.28 ATOM 19 C PRO D 431 240.164 273.952 369.182 1.00187.34 ATOM 20 O PRO D 431 241.367 274.224 369.235 1.00188.17 ATOM 21 N ASP D 432 239.372 273.982 370.252 1.00214.47 ATOM 22 CA ASP D 432 239.853 274.448 371.559 1.00217.08 ATOM 23 C ASP D 432 241.063 273.707 372.133 1.00218.62 ATOM 24 O ASP D 432 242.163 274.254 372.184 1.00220.22 ATOM 25 N GLY D 433 240.848 272.465 372.557 1.00194.50 ATOM 26 CA GLY D 433 241.858 271.711 373.286 1.00196.14 ATOM 27 C GLY D 433 242.783 270.892 372.407 1.00194.78 ATOM 28 O GLY D 433 243.374 269.913 372.861 1.00195.49 ATOM 29 N SER D 434 242.906 271.299 371.148 1.00179.43 ATOM 30 CA SER D 434 243.618 270.513 370.145 1.00177.82 ATOM 31 C SER D 434 245.131 270.699 370.134 1.00179.45 ATOM 32 O SER D 434 245.643 271.801 370.353 1.00181.17 ATOM 33 N PHE D 435 245.842 269.612 369.844 1.00178.89 ATOM 34 CA PHE D 435 247.298 269.652 369.793 1.00180.31 ATOM 35 C PHE D 435 247.917 268.870 368.630 1.00178.46 ATOM 36 O PHE D 435 247.391 267.834 368.193 1.00176.50 ATOM 37 N ARG D 436 249.042 269.390 368.146 1.00210.34 ATOM 38 CA ARG D 436 249.871 268.724 367.149 1.00209.07 ATOM 39 C ARG D 436 251.015 267.959 367.808 1.00210.72 ATOM 40 O ARG D 436 251.841 268.549 368.509 1.00213.12 ATOM 41 N ARG D 437 251.067 266.647 367.588 1.00178.57 ATOM 42 CA ARG D 437 252.210 265.872 368.043 1.00180.02 ATOM 43 C ARG D 437 252.756 265.037 366.897 1.00178.28 ATOM 44 O ARG D 437 252.112 264.109 366.426 1.00176.31 ATOM 45 N GLN D 438 253.956 265.378 366.456 1.00179.10 ATOM 46 CA GLN D 438 254.556 264.737 365.299 1.00177.61 ATOM 47 C GLN D 438 255.489 263.601 365.710 1.00178.57 ATOM 48 O GLN D 438 256.324 263.767 366.586 1.00180.92 ATOM 49 N ARG D 439 255.344 262.452 365.063 1.00176.80 ATOM 50 CA ARG D 439 256.176 261.283 365.326 1.00177.49 ATOM 51 C ARG D 439 257.044 261.089 364.083 1.00176.52 ATOM 52 O ARG D 439 257.018 261.921 363.175 1.00175.64 ATOM 53 N LYS D 440 257.834 260.023 364.038 1.00189.41 ATOM 54 CA LYS D 440 258.693 259.789 362.888 1.00188.64 ATOM 55 C LYS D 440 257.879 259.300 361.709 1.00185.88 ATOM 56 O LYS D 440 257.184 258.288 361.792 1.00184.76 ATOM 57 N GLY D 441 257.954 260.042 360.613 1.00204.21 ATOM 58 CA GLY D 441 257.259 259.670 359.397 1.00201.69 ATOM 59 C GLY D 441 255.796 260.071 359.352 1.00200.20 ATOM 60 O GLY D 441 255.196 260.072 358.278 1.00198.18 ATOM 61 N TYR D 442 255.204 260.383 360.506 1.00169.21 ATOM 62 CA TYR D 442 253.817 260.847 360.532 1.00167.95 ATOM 63 C TYR D 442 253.486 261.910 361.575 1.00169.53 ATOM 64 O TYR D 442 253.770 261.735 362.748 1.00171.37 ATOM 65 N GLU D 443 252.847 262.995 361.153 1.00168.86 ATOM 66 CA GLU D 443 252.322 263.969 362.100 1.00170.13 ATOM 67 C GLU D 443 250.982 263.455 362.587 1.00169.08 ATOM 68 O GLU D 443 250.207 262.926 361.801 1.00166.88 ATOM 69 N GLU D 444 250.712 263.573 363.878 1.00170.70 ATOM 70 CA GLU D 444 249.418 263.158 364.400 1.00169.89 ATOM 71 C GLU D 444 248.733 264.311 365.118 1.00170.89 ATOM 72 O GLU D 444 249.287 264.894 366.048 1.00173.22 ATOM 73 N VAL D 445 247.525 264.642 364.683 1.00169.19 ATOM 74 CA VAL D 445 246.786 265.740 365.281 1.00169.98 ATOM 75 C VAL D 445 245.613 265.217 366.096 1.00169.75 ATOM 76 O VAL D 445 244.933 264.269 365.690 1.00167.90 ATOM 77 N HIS D 446 245.399 265.834 367.258 1.00182.87 ATOM 78 CA HIS D 446 244.321 265.433 368.159 1.00183.04 ATOM 79 C HIS D 446 243.409 266.599 368.506 1.00183.41 ATOM 80 O HIS D 446 243.875 267.657 368.923 1.00185.21 ATOM 81 N VAL D 447 242.107 266.405 368.334 1.00197.48 ATOM 82 CA VAL D 447 241.139 267.354 368.873 1.00198.34 ATOM 83 C VAL D 447 240.110 266.620 369.728 1.00198.60 ATOM 84 O VAL D 447 239.688 265.509 369.391 1.00197.40 ATOM 85 N PRO D 448 239.722 267.233 370.860 1.00225.04 ATOM 86 CA PRO D 448 238.764 266.620 371.784 1.00225.59 ATOM 87 C PRO D 448 237.325 266.768 371.299 1.00224.55 ATOM 88 O PRO D 448 237.089 267.326 370.226 1.00223.37 ATOM 89 N ALA D 449 236.380 266.261 372.086 1.00185.38 ATOM 90 CA ALA D 449 234.967 266.368 371.751 1.00184.56 ATOM 91 C ALA D 449 234.463 267.783 372.013 1.00185.49 ATOM 92 O ALA D 449 235.004 268.500 372.855 1.00187.20 ATOM 93 N LEU D 450 233.439 268.185 371.271 1.00200.89 ATOM 94 CA LEU D 450 232.823 269.495 371.455 1.00201.69 ATOM 95 C LEU D 450 231.918 269.555 372.691 1.00203.13 ATOM 96 O LEU D 450 231.477 268.526 373.212 1.00203.22 ATOM 97 N LYS D 451 231.660 270.772 373.163 1.00196.22 ATOM 98 CA LYS D 451 230.803 270.997 374.321 1.00197.74 ATOM 99 C LYS D 451 229.447 271.566 373.892 1.00197.04 ATOM 100 O LYS D 451 229.373 272.695 373.397 1.00196.94 ATOM 101 N PRO D 452 228.370 270.772 374.069 1.00182.34 ATOM 102 CA PRO D 452 226.999 271.125 373.672 1.00181.60 ATOM 103 C PRO D 452 226.551 272.481 374.224 1.00183.00 ATOM 104 O PRO D 452 226.758 272.736 375.411 1.00184.91 ATOM 105 N LYS D 453 225.952 273.328 373.388 1.00208.93 ATOM 106 CA LYS D 453 225.433 274.622 373.851 1.00210.20 ATOM 107 C LYS D 453 224.363 274.430 374.924 1.00211.36 ATOM 108 O LYS D 453 223.417 273.667 374.726 1.00210.44 ATOM 109 N PRO D 454 224.507 275.132 376.061 1.00187.96 ATOM 110 CA PRO D 454 223.564 274.998 377.177 1.00189.34 ATOM 111 C PRO D 454 222.154 275.410 376.773 1.00188.61 ATOM 112 O PRO D 454 221.994 276.400 376.058 1.00188.01 ATOM 113 N PHE D 455 221.154 274.651 377.218 1.00203.02 ATOM 114 CA PHE D 455 219.761 274.919 376.868 1.00202.57 ATOM 115 C PHE D 455 219.364 276.359 377.220 1.00203.75 ATOM 116 O PHE D 455 219.582 276.819 378.346 1.00205.62 ATOM 117 N GLY D 456 218.799 277.065 376.240 1.00252.14 ATOM 118 CA GLY D 456 218.396 278.450 376.417 1.00253.11 ATOM 119 C GLY D 456 217.241 278.591 377.387 1.00254.55 ATOM 120 O GLY D 456 216.561 277.606 377.692 1.00254.47 ATOM 121 N SER D 457 217.019 279.811 377.872 1.00212.98 ATOM 122 CA SER D 457 215.996 280.049 378.886 1.00214.59 ATOM 123 C SER D 457 214.617 279.626 378.387 1.00213.72 ATOM 124 O SER D 457 214.138 280.112 377.361 1.00212.79 ATOM 125 N GLU D 458 213.990 278.730 379.141 1.00253.25 ATOM 126 CA GLU D 458 212.701 278.144 378.776 1.00253.12 ATOM 127 C GLU D 458 212.660 277.565 377.351 1.00251.22 ATOM 128 O GLU D 458 211.764 277.886 376.571 1.00250.66 TER