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 B 1 475 UNP P01876 IGHA1_HUMAN 1 475 SEQRES 1 B 115 THR PRO SER PRO SER THR PRO PRO THR PRO SER PRO SER SEQRES 2 B 115 CYS CYS HIS PRO ARG LEU SER LEU HIS ARG PRO ALA LEU SEQRES 3 B 115 GLU ASP LEU LEU LEU GLY SER GLU ALA ASN LEU THR CYS SEQRES 4 B 115 THR LEU THR GLY LEU ARG ASP ALA SER GLY VAL THR PHE SEQRES 5 B 115 THR TRP THR PRO SER SER GLY LYS SER ALA VAL GLN GLY SEQRES 6 B 115 PRO PRO GLU ARG ASP LEU CYS GLY CYS TYR SER VAL SER SEQRES 7 B 115 SER VAL LEU PRO GLY CYS ALA GLU PRO TRP ASN HIS GLY SEQRES 8 B 115 LYS THR PHE THR CYS THR ALA ALA TYR PRO GLU SER LYS SEQRES 9 B 115 THR PRO LEU THR ALA THR LEU SER LYS SER GLY ATOM 1 CA THR B 231 -10.784 54.071 -37.127 1.00 0.00 ATOM 2 CA PRO B 232 -11.709 50.248 -36.797 1.00 0.00 ATOM 3 CA SER B 233 -9.329 48.191 -34.485 1.00 0.00 ATOM 4 CA PRO B 234 -7.483 45.429 -36.558 1.00 0.00 ATOM 5 CA SER B 235 -6.307 43.449 -33.406 1.00 0.00 ATOM 6 CA THR B 236 -5.490 39.657 -32.994 1.00 0.00 ATOM 7 CA PRO B 237 -4.342 38.438 -29.510 1.00 0.00 ATOM 8 CA PRO B 238 -2.174 35.038 -29.694 1.00 0.00 ATOM 9 CA THR B 239 -2.185 33.262 -26.038 1.00 0.00 ATOM 10 CA PRO B 240 -0.490 29.640 -25.581 1.00 0.00 ATOM 11 CA SER B 241 -1.013 27.065 -22.481 1.00 0.00 ATOM 12 CA PRO B 242 0.643 25.031 -19.546 1.00 0.00 ATOM 13 CA SER B 243 0.624 21.402 -18.273 1.00 0.00 ATOM 14 CA CYS B 244 1.561 19.385 -15.167 1.00 0.00 ATOM 15 CA CYS B 245 5.041 19.013 -13.255 1.00 0.00 ATOM 16 CA HIS B 246 5.304 16.141 -10.757 1.00 0.00 ATOM 17 CA PRO B 247 8.795 14.483 -9.570 0.00 0.00 ATOM 18 CA ARG B 248 8.436 10.624 -9.759 0.00 0.00 ATOM 19 CA LEU B 249 11.413 8.195 -10.387 0.00 0.00 ATOM 20 CA SER B 250 10.446 4.828 -12.056 0.00 0.00 ATOM 21 CA LEU B 251 12.612 1.801 -13.104 0.00 0.00 ATOM 22 CA HIS B 252 11.142 -0.436 -15.890 0.00 0.00 ATOM 23 CA ARG B 253 12.926 -3.891 -16.006 0.00 0.00 ATOM 24 CA PRO B 254 14.127 -5.786 -19.193 0.00 0.00 ATOM 25 CA ALA B 255 11.620 -8.247 -20.878 0.00 0.00 ATOM 26 CA LEU B 256 12.098 -12.076 -20.354 0.00 0.00 ATOM 27 CA GLU B 257 11.677 -13.209 -24.045 0.00 0.00 ATOM 28 CA ASP B 258 14.176 -10.595 -25.493 0.00 0.00 ATOM 29 CA LEU B 259 16.948 -11.231 -22.854 0.00 0.00 ATOM 30 CA LEU B 260 16.655 -15.078 -23.351 0.00 0.00 ATOM 31 CA LEU B 261 16.388 -15.092 -27.229 0.00 0.00 ATOM 32 CA GLY B 262 19.616 -13.293 -28.392 0.00 0.00 ATOM 33 CA SER B 263 20.832 -11.388 -25.208 0.00 0.00 ATOM 34 CA GLU B 264 18.657 -8.220 -25.741 0.00 0.00 ATOM 35 CA ALA B 265 18.002 -6.504 -22.334 0.00 0.00 ATOM 36 CA ASN B 266 17.676 -2.770 -21.448 0.00 0.00 ATOM 37 CA LEU B 267 16.998 -1.522 -17.887 0.00 0.00 ATOM 38 CA THR B 268 15.109 1.747 -18.338 0.00 0.00 ATOM 39 CA CYS B 269 15.200 4.760 -15.957 0.00 0.00 ATOM 40 CA THR B 270 12.322 7.269 -16.150 0.00 0.00 ATOM 41 CA LEU B 271 12.169 10.595 -14.180 0.00 0.00 ATOM 42 CA THR B 272 8.550 11.871 -14.240 0.00 0.00 ATOM 43 CA GLY B 273 7.627 15.105 -12.316 0.00 0.00 ATOM 44 CA LEU B 274 10.680 17.453 -12.806 0.00 0.00 ATOM 45 CA ARG B 275 9.028 20.999 -12.815 0.00 0.00 ATOM 46 CA ASP B 276 9.857 24.042 -15.118 0.00 0.00 ATOM 47 CA ALA B 277 13.456 25.302 -16.037 0.00 0.00 ATOM 48 CA SER B 278 15.261 22.036 -15.226 0.00 0.00 ATOM 49 CA GLY B 279 17.703 19.145 -16.079 0.00 0.00 ATOM 50 CA VAL B 280 18.422 15.602 -14.705 0.00 0.00 ATOM 51 CA THR B 281 21.915 14.011 -14.153 0.00 0.00 ATOM 52 CA PHE B 282 22.059 10.188 -14.298 0.00 0.00 ATOM 53 CA THR B 283 24.590 7.831 -12.561 0.00 0.00 ATOM 54 CA TRP B 284 24.245 4.112 -13.638 0.00 0.00 ATOM 55 CA THR B 285 26.316 1.167 -12.199 0.00 0.00 ATOM 56 CA PRO B 286 28.130 -0.822 -15.010 0.00 0.00 ATOM 57 CA SER B 287 27.012 -4.401 -16.002 0.00 0.00 ATOM 58 CA SER B 288 29.339 -7.338 -14.992 0.00 0.00 ATOM 59 CA GLY B 289 31.745 -7.320 -18.044 0.00 0.00 ATOM 60 CA LYS B 290 32.857 -3.657 -17.320 0.00 0.00 ATOM 61 CA SER B 291 30.052 -2.018 -19.416 0.00 0.00 ATOM 62 CA ALA B 292 28.210 1.341 -18.804 0.00 0.00 ATOM 63 CA VAL B 293 26.422 2.908 -21.882 0.00 0.00 ATOM 64 CA GLN B 294 23.542 5.527 -21.664 0.00 0.00 ATOM 65 CA GLY B 295 21.281 7.840 -23.846 0.00 0.00 ATOM 66 CA PRO B 296 19.170 10.497 -21.958 0.00 0.00 ATOM 67 CA PRO B 297 16.618 12.771 -23.849 0.00 0.00 ATOM 68 CA GLU B 298 14.272 15.316 -22.083 0.00 0.00 ATOM 69 CA ARG B 299 10.585 14.809 -23.068 0.00 0.00 ATOM 70 CA ASP B 300 7.759 17.170 -21.857 0.00 0.00 ATOM 71 CA LEU B 301 4.865 14.753 -20.860 0.00 0.00 ATOM 72 CA CYS B 302 1.435 16.144 -19.626 0.00 0.00 ATOM 73 CA GLY B 303 3.042 19.616 -19.242 0.00 0.00 ATOM 74 CA CYS B 304 6.445 18.823 -17.529 0.00 0.00 ATOM 75 CA TYR B 305 9.958 17.331 -18.320 0.00 0.00 ATOM 76 CA SER B 306 10.887 13.570 -18.142 0.00 0.00 ATOM 77 CA VAL B 307 14.601 12.467 -18.395 0.00 0.00 ATOM 78 CA SER B 308 14.318 8.890 -19.653 0.00 0.00 ATOM 79 CA SER B 309 17.738 7.228 -19.861 0.00 0.00 ATOM 80 CA VAL B 310 18.406 3.585 -20.929 0.00 0.00 ATOM 81 CA LEU B 311 21.295 1.170 -20.053 0.00 0.00 ATOM 82 CA PRO B 312 21.724 -1.760 -22.580 0.00 0.00 ATOM 83 CA GLY B 313 22.625 -5.092 -20.851 0.00 0.00 ATOM 84 CA CYS B 314 23.739 -8.685 -21.588 0.00 0.00 ATOM 85 CA ALA B 315 21.963 -11.959 -20.502 0.00 0.00 ATOM 86 CA GLU B 316 24.790 -13.177 -18.100 0.00 0.00 ATOM 87 CA PRO B 317 24.615 -10.264 -15.485 0.00 0.00 ATOM 88 CA TRP B 318 20.748 -10.619 -15.345 0.00 0.00 ATOM 89 CA ASN B 319 20.821 -14.519 -15.163 0.00 0.00 ATOM 90 CA HIS B 320 23.789 -14.810 -12.637 0.00 0.00 ATOM 91 CA GLY B 321 22.731 -11.981 -10.189 0.00 0.00 ATOM 92 CA LYS B 322 23.736 -8.291 -10.794 0.00 0.00 ATOM 93 CA THR B 323 22.300 -5.157 -9.007 0.00 0.00 ATOM 94 CA PHE B 324 21.519 -2.266 -11.445 0.00 0.00 ATOM 95 CA THR B 325 21.448 1.138 -9.734 0.00 0.00 ATOM 96 CA CYS B 326 20.054 4.280 -11.427 0.00 0.00 ATOM 97 CA THR B 327 21.057 7.224 -9.206 0.00 0.00 ATOM 98 CA ALA B 328 19.621 10.551 -10.386 0.00 0.00 ATOM 99 CA ALA B 329 20.744 14.023 -9.068 0.00 0.00 ATOM 100 CA TYR B 330 18.780 17.375 -9.376 0.00 0.00 ATOM 101 CA PRO B 331 19.125 20.608 -7.183 0.00 0.00 ATOM 102 CA GLU B 332 15.368 20.826 -6.172 0.00 0.00 ATOM 103 CA SER B 333 15.565 17.076 -5.125 0.00 0.00 ATOM 104 CA LYS B 334 17.637 17.597 -1.871 0.00 0.00 ATOM 105 CA THR B 335 18.379 13.810 -1.597 0.00 0.00 ATOM 106 CA PRO B 336 19.607 12.413 -5.023 0.00 0.00 ATOM 107 CA LEU B 337 17.293 9.412 -5.798 0.00 0.00 ATOM 108 CA THR B 338 18.841 5.950 -6.022 0.00 0.00 ATOM 109 CA ALA B 339 16.735 3.025 -7.439 0.00 0.00 ATOM 110 CA THR B 340 18.354 -0.471 -7.647 0.00 0.00 ATOM 111 CA LEU B 341 17.084 -3.533 -9.558 0.00 0.00 ATOM 112 CA SER B 342 18.162 -7.257 -9.962 0.00 0.00 ATOM 113 CA LYS B 343 16.901 -10.935 -10.166 0.00 0.00 ATOM 114 CA SER B 344 14.510 -12.480 -7.517 0.00 0.00 ATOM 115 CA GLY B 345 14.894 -14.782 -4.420 0.00 0.00 TER