HEADER IMMUNE SYSTEM 10-MAR-08 3CHN TITLE Solution structure of human secretory IgA1 COMPND MOL_ID: 2; COMPND 2 MOLECULE: Ig alpha-1 chain C region; COMPND 3 CHAIN: A, B, D, C; EXPDTA SOLUTION SCATTERING DBREF 3CHN D 123 475 UNP P01876 IGHA1_HUMAN 1 353 SEQRES 1 D 108 ASN THR PHE ARG PRO GLU VAL HIS LEU LEU PRO PRO PRO SEQRES 2 D 108 SER GLU GLU LEU ALA LEU ASN GLU LEU VAL THR LEU THR SEQRES 3 D 108 CYS LEU ALA ARG GLY PHE SER PRO LYS ASP VAL LEU VAL SEQRES 4 D 108 ARG TRP LEU GLN GLY SER GLN GLU LEU PRO ARG GLU LYS SEQRES 5 D 108 TYR LEU THR TRP ALA SER ARG GLN GLU PRO SER GLN GLY SEQRES 6 D 108 THR THR THR PHE ALA VAL THR SER ILE LEU ARG VAL ALA SEQRES 7 D 108 ALA GLU ASP TRP LYS LYS GLY ASP THR PHE SER CYS MET SEQRES 8 D 108 VAL GLY HIS GLU ALA LEU PRO LEU ALA PHE THR GLN LYS SEQRES 9 D 108 THR ILE ASP ARG ATOM 1 CA ASN D 346 46.638 71.143 -13.059 0.00 0.00 ATOM 2 CA THR D 347 43.684 68.714 -13.788 0.00 0.00 ATOM 3 CA PHE D 348 42.656 65.379 -12.042 0.00 0.00 ATOM 4 CA ARG D 349 39.882 62.867 -13.128 0.00 0.00 ATOM 5 CA PRO D 350 36.897 62.649 -10.631 0.00 0.00 ATOM 6 CA GLU D 351 36.318 59.208 -9.061 0.00 0.00 ATOM 7 CA VAL D 352 32.468 58.800 -8.901 0.00 0.00 ATOM 8 CA HIS D 353 31.107 56.130 -6.451 0.00 0.00 ATOM 9 CA LEU D 354 27.306 55.798 -5.880 0.00 0.00 ATOM 10 CA LEU D 355 26.272 54.757 -2.341 0.00 0.00 ATOM 11 CA PRO D 356 22.831 53.174 -1.535 0.00 0.00 ATOM 12 CA PRO D 357 20.970 54.140 1.722 0.00 0.00 ATOM 13 CA PRO D 358 21.925 52.772 5.174 0.00 0.00 ATOM 14 CA SER D 359 19.813 49.836 6.553 0.00 0.00 ATOM 15 CA GLU D 360 18.483 52.082 9.420 0.00 0.00 ATOM 16 CA GLU D 361 17.238 54.799 6.934 0.00 0.00 ATOM 17 CA LEU D 362 14.842 52.143 5.454 0.00 0.00 ATOM 18 CA ALA D 363 12.977 52.472 8.823 0.00 0.00 ATOM 19 CA LEU D 364 12.213 56.033 7.457 0.00 0.00 ATOM 20 CA ASN D 365 9.569 56.708 4.691 0.00 0.00 ATOM 21 CA GLU D 366 9.151 59.955 2.577 0.00 0.00 ATOM 22 CA LEU D 367 12.862 60.403 1.586 0.00 0.00 ATOM 23 CA VAL D 368 15.539 57.676 0.959 0.00 0.00 ATOM 24 CA THR D 369 19.007 59.146 0.923 0.00 0.00 ATOM 25 CA LEU D 370 20.783 58.213 -2.384 0.00 0.00 ATOM 26 CA THR D 371 24.387 59.458 -2.178 0.00 0.00 ATOM 27 CA CYS D 372 27.095 59.892 -4.835 0.00 0.00 ATOM 28 CA LEU D 373 30.690 60.710 -3.800 0.00 0.00 ATOM 29 CA ALA D 374 32.809 62.611 -6.388 0.00 0.00 ATOM 30 CA ARG D 375 36.403 62.545 -5.028 0.00 0.00 ATOM 31 CA GLY D 376 40.057 63.259 -6.029 0.00 0.00 ATOM 32 CA PHE D 377 39.091 65.905 -8.665 0.00 0.00 ATOM 33 CA SER D 378 40.803 69.208 -9.735 0.00 0.00 ATOM 34 CA PRO D 379 40.166 71.975 -10.430 0.00 0.00 ATOM 35 CA LYS D 380 37.062 72.466 -8.158 0.00 0.00 ATOM 36 CA ASP D 381 35.064 73.270 -11.290 0.00 0.00 ATOM 37 CA VAL D 382 32.399 70.478 -11.642 0.00 0.00 ATOM 38 CA LEU D 383 28.649 69.875 -12.384 0.00 0.00 ATOM 39 CA VAL D 384 26.756 67.008 -10.740 0.00 0.00 ATOM 40 CA ARG D 385 23.107 66.149 -11.637 0.00 0.00 ATOM 41 CA TRP D 386 20.712 63.223 -10.969 0.00 0.00 ATOM 42 CA LEU D 387 18.438 61.245 -13.344 0.00 0.00 ATOM 43 CA GLN D 388 15.499 58.823 -12.900 0.00 0.00 ATOM 44 CA GLY D 389 15.643 55.630 -15.091 0.00 0.00 ATOM 45 CA SER D 390 11.976 54.661 -14.312 0.00 0.00 ATOM 46 CA GLN D 391 10.456 57.810 -16.016 0.00 0.00 ATOM 47 CA GLU D 392 13.422 58.634 -18.405 0.00 0.00 ATOM 48 CA LEU D 393 13.613 62.147 -16.818 0.00 0.00 ATOM 49 CA PRO D 394 15.885 64.426 -14.690 0.00 0.00 ATOM 50 CA ARG D 395 15.167 64.493 -10.909 0.00 0.00 ATOM 51 CA GLU D 396 14.213 67.326 -8.508 0.00 0.00 ATOM 52 CA LYS D 397 14.775 66.486 -4.812 0.00 0.00 ATOM 53 CA TYR D 398 18.591 66.628 -4.691 0.00 0.00 ATOM 54 CA LEU D 399 21.207 68.829 -2.961 0.00 0.00 ATOM 55 CA THR D 400 25.030 69.064 -3.583 0.00 0.00 ATOM 56 CA TRP D 401 27.546 70.292 -0.894 0.00 0.00 ATOM 57 CA ALA D 402 31.355 71.160 -1.152 0.00 0.00 ATOM 58 CA SER D 403 34.916 70.306 0.191 0.00 0.00 ATOM 59 CA ARG D 404 38.326 71.625 -1.122 0.00 0.00 ATOM 60 CA GLN D 405 41.053 69.436 0.556 0.00 0.00 ATOM 61 CA GLU D 406 44.323 71.291 1.528 0.00 0.00 ATOM 62 CA PRO D 407 46.533 70.382 4.593 0.00 0.00 ATOM 63 CA SER D 408 50.247 71.358 5.251 0.00 0.00 ATOM 64 CA GLN D 409 51.535 68.764 2.669 0.00 0.00 ATOM 65 CA GLY D 410 51.600 68.652 -1.196 0.00 0.00 ATOM 66 CA THR D 411 48.254 66.716 -1.263 0.00 0.00 ATOM 67 CA THR D 412 45.503 69.121 -2.591 0.00 0.00 ATOM 68 CA THR D 413 42.403 67.858 -4.621 0.00 0.00 ATOM 69 CA PHE D 414 38.563 68.244 -3.985 0.00 0.00 ATOM 70 CA ALA D 415 35.651 66.053 -2.821 0.00 0.00 ATOM 71 CA VAL D 416 31.825 66.557 -2.829 0.00 0.00 ATOM 72 CA THR D 417 28.807 64.450 -1.830 0.00 0.00 ATOM 73 CA SER D 418 25.460 64.834 -3.690 0.00 0.00 ATOM 74 CA ILE D 419 22.230 63.760 -1.923 0.00 0.00 ATOM 75 CA LEU D 420 19.143 62.597 -3.957 0.00 0.00 ATOM 76 CA ARG D 421 16.169 62.042 -1.627 0.00 0.00 ATOM 77 CA VAL D 422 13.468 59.525 -2.872 0.00 0.00 ATOM 78 CA ALA D 423 10.319 57.747 -1.570 0.00 0.00 ATOM 79 CA ALA D 424 11.295 54.389 0.142 0.00 0.00 ATOM 80 CA GLU D 425 8.875 52.583 -2.267 0.00 0.00 ATOM 81 CA ASP D 426 10.462 53.628 -5.672 0.00 0.00 ATOM 82 CA TRP D 427 13.937 52.401 -4.558 0.00 0.00 ATOM 83 CA LYS D 428 12.246 49.033 -3.589 0.00 0.00 ATOM 84 CA LYS D 429 10.227 49.032 -6.898 0.00 0.00 ATOM 85 CA GLY D 430 13.733 48.410 -8.405 0.00 0.00 ATOM 86 CA ASP D 431 14.304 51.852 -9.953 0.00 0.00 ATOM 87 CA THR D 432 17.703 52.845 -11.407 0.00 0.00 ATOM 88 CA PHE D 433 18.867 56.362 -10.388 0.00 0.00 ATOM 89 CA SER D 434 22.062 57.782 -11.984 0.00 0.00 ATOM 90 CA CYS D 435 24.462 60.487 -10.796 0.00 0.00 ATOM 91 CA MET D 436 25.905 62.357 -13.854 0.00 0.00 ATOM 92 CA VAL D 437 29.253 64.164 -13.268 0.00 0.00 ATOM 93 CA GLY D 438 30.704 66.706 -15.759 0.00 0.00 ATOM 94 CA HIS D 439 34.346 67.767 -15.344 0.00 0.00 ATOM 95 CA GLU D 440 37.369 69.050 -17.419 0.00 0.00 ATOM 96 CA ALA D 441 39.312 65.730 -16.936 0.00 0.00 ATOM 97 CA LEU D 442 36.439 63.249 -17.679 0.00 0.00 ATOM 98 CA PRO D 443 36.719 61.164 -20.961 0.00 0.00 ATOM 99 CA LEU D 444 33.901 62.910 -22.939 0.00 0.00 ATOM 100 CA ALA D 445 33.689 65.696 -20.253 0.00 0.00 ATOM 101 CA PHE D 446 30.896 63.473 -18.854 0.00 0.00 ATOM 102 CA THR D 447 30.560 60.275 -16.792 0.00 0.00 ATOM 103 CA GLN D 448 27.459 58.699 -15.199 0.00 0.00 ATOM 104 CA LYS D 449 27.446 56.073 -12.370 0.00 0.00 ATOM 105 CA THR D 450 24.174 54.217 -11.551 0.00 0.00 ATOM 106 CA ILE D 451 22.322 53.040 -8.347 0.00 0.00 ATOM 107 CA ASP D 452 19.473 50.472 -8.022 0.00 0.00 ATOM 108 CA ARG D 453 18.016 48.039 -5.377 0.00 0.00 TER