HEADER IMMUNE SYSTEM 02-AUG-07 2QTJ TITLE Solution structure of human dimeric immunoglobulin A COMPND MOL_ID: 2; COMPND 2 MOLECULE: Ig alpha-1 chain C region; COMPND 3 CHAIN: A, B, C, D; EXPDTA SOLUTION SCATTERING DBREF 2QTJ A 1 475 UNP P01876 IGHA1_HUMAN 1 475 SEQRES 1 A 108 ALA SER PRO THR SER PRO LYS VAL PHE PRO LEU SER LEU SEQRES 2 A 108 CYS SER THR GLN PRO ASP GLY ASN VAL VAL ILE ALA CYS SEQRES 3 A 108 LEU VAL GLN GLY PHE PHE PRO GLN GLU PRO LEU SER VAL SEQRES 4 A 108 THR TRP SER GLU SER GLY GLN GLY VAL THR ALA ARG ASN SEQRES 5 A 108 PHE PRO PRO SER GLN ASP ALA SER GLY ASP LEU TYR THR SEQRES 6 A 108 THR SER SER GLN LEU THR LEU PRO ALA THR GLN CYS LEU SEQRES 7 A 108 ALA GLY LYS SER VAL THR CYS HIS VAL LYS HIS TYR THR SEQRES 8 A 108 ASN PRO SER GLN ASP VAL THR VAL PRO CYS PRO VAL PRO SEQRES 9 A 108 SER THR PRO PRO ATOM 1 CA ALA A 123 55.667 72.692 6.750 0.00 0.00 ATOM 2 CA SER A 124 54.282 74.251 9.895 0.00 0.00 ATOM 3 CA PRO A 125 52.495 72.316 12.730 0.00 0.00 ATOM 4 CA THR A 126 48.766 73.302 13.007 0.00 0.00 ATOM 5 CA SER A 127 46.246 72.156 15.703 0.00 0.00 ATOM 6 CA PRO A 128 42.791 70.770 14.600 0.00 0.00 ATOM 7 CA LYS A 129 39.624 72.919 14.736 0.00 0.00 ATOM 8 CA VAL A 130 36.738 70.668 15.842 0.00 0.00 ATOM 9 CA PHE A 131 33.237 71.309 14.376 0.00 0.00 ATOM 10 CA PRO A 132 29.879 69.618 15.178 0.00 0.00 ATOM 11 CA LEU A 133 28.041 67.528 12.555 0.00 0.00 ATOM 12 CA SER A 134 24.340 67.444 13.632 0.00 0.00 ATOM 13 CA LEU A 135 20.862 67.529 11.953 0.00 0.00 ATOM 14 CA CYS A 136 17.624 69.128 13.289 0.00 0.00 ATOM 15 CA SER A 137 14.723 67.182 11.562 0.00 0.00 ATOM 16 CA THR A 138 16.889 66.462 8.415 0.00 0.00 ATOM 17 CA GLN A 139 17.804 62.823 9.454 0.00 0.00 ATOM 18 CA PRO A 140 15.347 59.851 8.930 0.00 0.00 ATOM 19 CA ASP A 141 12.801 59.109 11.780 0.00 0.00 ATOM 20 CA GLY A 142 14.310 56.182 13.828 0.00 0.00 ATOM 21 CA ASN A 143 18.166 56.362 13.938 0.00 0.00 ATOM 22 CA VAL A 144 20.484 59.356 14.665 0.00 0.00 ATOM 23 CA VAL A 145 23.908 60.136 13.044 0.00 0.00 ATOM 24 CA ILE A 146 26.021 62.823 14.761 0.00 0.00 ATOM 25 CA ALA A 147 29.709 63.524 14.215 0.00 0.00 ATOM 26 CA CYS A 148 32.791 65.712 14.815 0.00 0.00 ATOM 27 CA LEU A 149 34.773 67.164 11.876 0.00 0.00 ATOM 28 CA VAL A 150 38.476 67.377 13.055 0.00 0.00 ATOM 29 CA GLN A 151 39.697 69.964 10.524 0.00 0.00 ATOM 30 CA GLY A 152 42.950 71.544 9.254 0.00 0.00 ATOM 31 CA PHE A 153 45.732 69.867 11.246 0.00 0.00 ATOM 32 CA PHE A 154 49.398 68.980 10.521 0.00 0.00 ATOM 33 CA PRO A 155 51.133 66.653 10.923 0.00 0.00 ATOM 34 CA GLN A 156 48.824 63.519 10.896 0.00 0.00 ATOM 35 CA GLU A 157 50.007 61.978 14.287 0.00 0.00 ATOM 36 CA PRO A 158 47.836 59.583 16.461 0.00 0.00 ATOM 37 CA LEU A 159 44.317 61.048 16.865 0.00 0.00 ATOM 38 CA SER A 160 42.395 59.521 19.850 0.00 0.00 ATOM 39 CA VAL A 161 38.617 60.113 19.368 0.00 0.00 ATOM 40 CA THR A 162 36.280 58.921 22.145 0.00 0.00 ATOM 41 CA TRP A 163 32.480 59.604 22.488 0.00 0.00 ATOM 42 CA SER A 164 30.568 60.107 25.848 0.00 0.00 ATOM 43 CA GLU A 165 27.901 57.419 25.003 0.00 0.00 ATOM 44 CA SER A 166 28.790 53.677 24.474 0.00 0.00 ATOM 45 CA GLY A 167 26.495 50.590 24.077 0.00 0.00 ATOM 46 CA GLN A 168 25.249 47.586 21.988 0.00 0.00 ATOM 47 CA GLY A 169 23.502 49.538 19.141 0.00 0.00 ATOM 48 CA VAL A 170 25.762 52.687 19.311 0.00 0.00 ATOM 49 CA THR A 171 28.400 52.404 16.498 0.00 0.00 ATOM 50 CA ALA A 172 31.505 54.665 16.304 0.00 0.00 ATOM 51 CA ARG A 173 33.269 55.089 12.914 0.00 0.00 ATOM 52 CA ASN A 174 36.664 56.879 12.931 0.00 0.00 ATOM 53 CA PHE A 175 37.448 57.871 9.272 0.00 0.00 ATOM 54 CA PRO A 176 41.260 57.808 8.434 0.00 0.00 ATOM 55 CA PRO A 177 43.049 61.204 7.814 0.00 0.00 ATOM 56 CA SER A 178 42.609 62.643 4.275 0.00 0.00 ATOM 57 CA GLN A 179 45.263 65.102 2.992 0.00 0.00 ATOM 58 CA ASP A 180 44.333 68.406 1.164 0.00 0.00 ATOM 59 CA ALA A 181 46.700 69.192 -1.844 0.00 0.00 ATOM 60 CA SER A 182 50.564 68.861 -1.434 0.00 0.00 ATOM 61 CA GLY A 183 50.878 68.181 2.354 0.00 0.00 ATOM 62 CA ASP A 184 49.007 71.459 3.261 0.00 0.00 ATOM 63 CA LEU A 185 46.355 70.292 5.840 0.00 0.00 ATOM 64 CA TYR A 186 44.845 66.940 7.053 0.00 0.00 ATOM 65 CA THR A 187 41.089 66.463 7.888 0.00 0.00 ATOM 66 CA THR A 188 39.412 63.449 9.669 0.00 0.00 ATOM 67 CA SER A 189 35.729 62.905 10.638 0.00 0.00 ATOM 68 CA SER A 190 34.491 60.801 13.648 0.00 0.00 ATOM 69 CA GLN A 191 30.838 59.576 13.345 0.00 0.00 ATOM 70 CA LEU A 192 28.504 58.180 16.096 0.00 0.00 ATOM 71 CA THR A 193 25.415 56.246 14.778 0.00 0.00 ATOM 72 CA LEU A 194 22.863 55.465 17.619 0.00 0.00 ATOM 73 CA PRO A 195 19.036 54.825 17.948 0.00 0.00 ATOM 74 CA ALA A 196 16.800 58.001 18.147 0.00 0.00 ATOM 75 CA THR A 197 15.423 56.778 21.568 0.00 0.00 ATOM 76 CA GLN A 198 19.090 56.908 22.864 0.00 0.00 ATOM 77 CA CYS A 199 19.704 60.454 21.397 0.00 0.00 ATOM 78 CA LEU A 200 16.515 62.546 22.072 0.00 0.00 ATOM 79 CA ALA A 201 15.930 66.232 20.961 0.00 0.00 ATOM 80 CA GLY A 202 17.464 68.787 23.427 0.00 0.00 ATOM 81 CA LYS A 203 20.149 66.271 24.633 0.00 0.00 ATOM 82 CA SER A 204 23.870 66.151 23.567 0.00 0.00 ATOM 83 CA VAL A 205 26.796 63.631 23.228 0.00 0.00 ATOM 84 CA THR A 206 30.409 64.785 23.915 0.00 0.00 ATOM 85 CA CYS A 207 33.223 63.975 21.436 0.00 0.00 ATOM 86 CA HIS A 208 36.721 63.918 23.090 0.00 0.00 ATOM 87 CA VAL A 209 39.629 64.470 20.625 0.00 0.00 ATOM 88 CA LYS A 210 43.300 63.964 21.626 0.00 0.00 ATOM 89 CA HIS A 211 45.884 65.009 18.967 0.00 0.00 ATOM 90 CA TYR A 212 49.407 63.509 20.015 0.00 0.00 ATOM 91 CA THR A 213 50.454 64.344 23.627 0.00 0.00 ATOM 92 CA ASN A 214 48.452 67.638 23.529 0.00 0.00 ATOM 93 CA PRO A 215 45.516 68.356 25.978 0.00 0.00 ATOM 94 CA SER A 216 42.071 66.849 25.086 0.00 0.00 ATOM 95 CA GLN A 217 39.747 69.054 22.945 0.00 0.00 ATOM 96 CA ASP A 218 36.070 68.430 23.865 0.00 0.00 ATOM 97 CA VAL A 219 32.908 69.325 21.851 0.00 0.00 ATOM 98 CA THR A 220 29.290 68.876 22.987 0.00 0.00 ATOM 99 CA VAL A 221 27.406 67.683 19.827 0.00 0.00 ATOM 100 CA PRO A 222 23.512 67.955 19.790 0.00 0.00 ATOM 101 CA CYS A 223 22.394 67.933 18.210 0.00 0.00 ATOM 102 CA PRO A 224 21.275 67.911 16.629 1.00 0.00 ATOM 103 CA VAL A 225 20.170 65.406 15.004 1.00 0.00 ATOM 104 CA PRO A 226 20.542 61.396 15.028 1.00 0.00 ATOM 105 CA SER A 227 18.217 61.214 11.723 1.00 0.00 ATOM 106 CA THR A 228 18.560 58.975 8.497 1.00 0.00 ATOM 107 CA PRO A 229 14.979 58.144 7.068 1.00 0.00 ATOM 108 CA PRO A 230 14.240 57.018 3.271 1.00 0.00 TER