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 115 THR PRO SER PRO SER THR PRO PRO THR PRO SER PRO SER SEQRES 2 D 115 CYS CYS HIS PRO ARG LEU SER LEU HIS ARG PRO ALA LEU SEQRES 3 D 115 GLU ASP LEU LEU LEU GLY SER GLU ALA ASN LEU THR CYS SEQRES 4 D 115 THR LEU THR GLY LEU ARG ASP ALA SER GLY VAL THR PHE SEQRES 5 D 115 THR TRP THR PRO SER SER GLY LYS SER ALA VAL GLN GLY SEQRES 6 D 115 PRO PRO GLU ARG ASP LEU CYS GLY CYS TYR SER VAL SER SEQRES 7 D 115 SER VAL LEU PRO GLY CYS ALA GLU PRO TRP ASN HIS GLY SEQRES 8 D 115 LYS THR PHE THR CYS THR ALA ALA TYR PRO GLU SER LYS SEQRES 9 D 115 THR PRO LEU THR ALA THR LEU SER LYS SER GLY ATOM 1 CA THR D 231 22.229 148.348 10.014 1.00 0.00 ATOM 2 CA PRO D 232 21.739 144.539 10.927 1.00 0.00 ATOM 3 CA SER D 233 23.993 142.077 8.905 1.00 0.00 ATOM 4 CA PRO D 234 21.777 139.693 6.725 1.00 0.00 ATOM 5 CA SER D 235 24.677 137.178 6.023 1.00 0.00 ATOM 6 CA THR D 236 24.540 133.361 5.228 1.00 0.00 ATOM 7 CA PRO D 237 27.891 131.535 4.613 1.00 0.00 ATOM 8 CA PRO D 238 27.451 128.189 2.398 1.00 0.00 ATOM 9 CA THR D 239 30.693 125.801 2.947 1.00 0.00 ATOM 10 CA PRO D 240 30.765 122.131 1.296 1.00 0.00 ATOM 11 CA SER D 241 33.249 119.062 2.256 1.00 0.00 ATOM 12 CA PRO D 242 36.002 116.523 1.044 1.00 0.00 ATOM 13 CA SER D 243 36.602 112.727 1.210 1.00 0.00 ATOM 14 CA CYS D 244 39.414 110.186 0.736 1.00 0.00 ATOM 15 CA CYS D 245 41.743 109.437 -2.413 1.00 0.00 ATOM 16 CA HIS D 246 43.712 106.168 -2.327 1.00 0.00 ATOM 17 CA PRO D 247 45.112 104.280 -5.616 0.00 0.00 ATOM 18 CA ARG D 248 44.197 100.518 -5.339 0.00 0.00 ATOM 19 CA LEU D 249 43.620 98.192 -8.408 0.00 0.00 ATOM 20 CA SER D 250 41.258 95.183 -7.752 0.00 0.00 ATOM 21 CA LEU D 251 40.044 92.355 -10.091 0.00 0.00 ATOM 22 CA HIS D 252 36.716 90.662 -9.097 0.00 0.00 ATOM 23 CA ARG D 253 36.273 87.253 -10.922 0.00 0.00 ATOM 24 CA PRO D 254 33.025 85.928 -12.624 0.00 0.00 ATOM 25 CA ALA D 255 30.572 83.836 -10.437 0.00 0.00 ATOM 26 CA LEU D 256 30.484 79.967 -10.874 0.00 0.00 ATOM 27 CA GLU D 257 26.631 79.504 -11.043 0.00 0.00 ATOM 28 CA ASP D 258 26.065 82.294 -13.704 0.00 0.00 ATOM 29 CA LEU D 259 28.947 81.165 -16.045 0.00 0.00 ATOM 30 CA LEU D 260 27.748 77.469 -15.879 0.00 0.00 ATOM 31 CA LEU D 261 23.932 78.136 -16.214 0.00 0.00 ATOM 32 CA GLY D 262 23.614 80.064 -19.559 0.00 0.00 ATOM 33 CA SER D 263 27.229 81.364 -20.246 0.00 0.00 ATOM 34 CA GLU D 264 26.931 84.609 -18.141 0.00 0.00 ATOM 35 CA ALA D 265 30.443 85.711 -16.947 0.00 0.00 ATOM 36 CA ASN D 266 31.909 89.237 -16.440 0.00 0.00 ATOM 37 CA LEU D 267 35.485 89.855 -15.205 0.00 0.00 ATOM 38 CA THR D 268 35.329 93.179 -13.367 0.00 0.00 ATOM 39 CA CYS D 269 38.185 95.731 -13.050 0.00 0.00 ATOM 40 CA THR D 270 37.995 98.276 -10.206 0.00 0.00 ATOM 41 CA LEU D 271 40.470 101.206 -9.711 0.00 0.00 ATOM 42 CA THR D 272 40.076 102.529 -6.129 0.00 0.00 ATOM 43 CA GLY D 273 42.370 105.390 -4.878 0.00 0.00 ATOM 44 CA LEU D 274 42.775 107.740 -7.942 0.00 0.00 ATOM 45 CA ARG D 275 43.133 111.259 -6.265 0.00 0.00 ATOM 46 CA ASP D 276 41.554 114.645 -7.402 0.00 0.00 ATOM 47 CA ALA D 277 41.435 115.993 -11.083 0.00 0.00 ATOM 48 CA SER D 278 41.931 112.609 -12.782 0.00 0.00 ATOM 49 CA GLY D 279 40.970 109.876 -15.364 0.00 0.00 ATOM 50 CA VAL D 280 41.799 106.135 -15.906 0.00 0.00 ATOM 51 CA THR D 281 42.594 104.421 -19.293 0.00 0.00 ATOM 52 CA PHE D 282 41.806 100.681 -19.504 0.00 0.00 ATOM 53 CA THR D 283 43.474 98.019 -21.767 0.00 0.00 ATOM 54 CA TRP D 284 41.720 94.551 -21.640 0.00 0.00 ATOM 55 CA THR D 285 42.925 91.368 -23.500 0.00 0.00 ATOM 56 CA PRO D 286 40.122 89.876 -25.751 0.00 0.00 ATOM 57 CA SER D 287 38.359 86.541 -24.845 0.00 0.00 ATOM 58 CA SER D 288 39.183 83.438 -27.025 0.00 0.00 ATOM 59 CA GLY D 289 36.590 83.954 -29.871 0.00 0.00 ATOM 60 CA LYS D 290 38.107 87.417 -30.814 0.00 0.00 ATOM 61 CA SER D 291 35.923 89.442 -28.345 0.00 0.00 ATOM 62 CA ALA D 292 36.822 92.668 -26.388 0.00 0.00 ATOM 63 CA VAL D 293 33.828 94.775 -25.077 0.00 0.00 ATOM 64 CA GLN D 294 34.055 97.357 -22.165 0.00 0.00 ATOM 65 CA GLY D 295 31.990 100.051 -20.239 0.00 0.00 ATOM 66 CA PRO D 296 33.967 102.368 -17.829 0.00 0.00 ATOM 67 CA PRO D 297 32.132 104.976 -15.570 0.00 0.00 ATOM 68 CA GLU D 298 33.934 107.207 -12.949 0.00 0.00 ATOM 69 CA ARG D 299 32.319 106.935 -9.464 0.00 0.00 ATOM 70 CA ASP D 300 33.475 109.089 -6.453 0.00 0.00 ATOM 71 CA LEU D 301 33.577 106.577 -3.472 0.00 0.00 ATOM 72 CA CYS D 302 34.489 107.783 0.126 0.00 0.00 ATOM 73 CA GLY D 303 35.719 111.111 -1.362 0.00 0.00 ATOM 74 CA CYS D 304 37.771 109.979 -4.467 0.00 0.00 ATOM 75 CA TYR D 305 37.281 108.596 -8.080 0.00 0.00 ATOM 76 CA SER D 306 36.938 104.848 -9.019 0.00 0.00 ATOM 77 CA VAL D 307 37.072 103.751 -12.740 0.00 0.00 ATOM 78 CA SER D 308 35.179 100.454 -12.699 0.00 0.00 ATOM 79 CA SER D 309 35.211 98.802 -16.131 0.00 0.00 ATOM 80 CA VAL D 310 33.638 95.393 -17.003 0.00 0.00 ATOM 81 CA LEU D 311 34.514 92.820 -19.750 0.00 0.00 ATOM 82 CA PRO D 312 31.609 90.371 -20.603 0.00 0.00 ATOM 83 CA GLY D 313 32.844 86.775 -21.266 0.00 0.00 ATOM 84 CA CYS D 314 31.671 83.349 -22.526 0.00 0.00 ATOM 85 CA ALA D 315 31.882 79.963 -20.644 0.00 0.00 ATOM 86 CA GLU D 316 34.439 78.302 -23.081 0.00 0.00 ATOM 87 CA PRO D 317 37.465 80.714 -22.470 0.00 0.00 ATOM 88 CA TRP D 318 36.942 80.396 -18.631 0.00 0.00 ATOM 89 CA ASN D 319 36.449 76.524 -18.725 0.00 0.00 ATOM 90 CA HIS D 320 39.311 75.752 -21.270 0.00 0.00 ATOM 91 CA GLY D 321 42.025 78.124 -19.812 0.00 0.00 ATOM 92 CA LYS D 322 42.237 81.848 -20.853 0.00 0.00 ATOM 93 CA THR D 323 44.303 84.644 -19.119 0.00 0.00 ATOM 94 CA PHE D 324 42.316 87.928 -18.687 0.00 0.00 ATOM 95 CA THR D 325 44.566 90.981 -18.310 0.00 0.00 ATOM 96 CA CYS D 326 43.255 94.390 -17.155 0.00 0.00 ATOM 97 CA THR D 327 46.084 96.887 -17.765 0.00 0.00 ATOM 98 CA ALA D 328 45.299 100.390 -16.487 0.00 0.00 ATOM 99 CA ALA D 329 47.360 103.562 -17.349 0.00 0.00 ATOM 100 CA TYR D 330 47.345 106.944 -15.415 0.00 0.00 ATOM 101 CA PRO D 331 50.099 109.737 -15.377 0.00 0.00 ATOM 102 CA GLU D 332 50.539 109.830 -11.506 0.00 0.00 ATOM 103 CA SER D 333 50.932 105.955 -11.585 0.00 0.00 ATOM 104 CA LYS D 334 54.507 105.867 -13.125 0.00 0.00 ATOM 105 CA THR D 335 54.226 102.079 -13.864 0.00 0.00 ATOM 106 CA PRO D 336 50.838 101.285 -15.624 0.00 0.00 ATOM 107 CA LEU D 337 49.202 98.500 -13.494 0.00 0.00 ATOM 108 CA THR D 338 48.618 95.108 -15.100 0.00 0.00 ATOM 109 CA ALA D 339 46.401 92.507 -13.276 0.00 0.00 ATOM 110 CA THR D 340 45.837 89.078 -14.951 0.00 0.00 ATOM 111 CA LEU D 341 43.246 86.417 -14.029 0.00 0.00 ATOM 112 CA SER D 342 42.368 82.806 -15.205 0.00 0.00 ATOM 113 CA LYS D 343 41.332 79.238 -14.034 0.00 0.00 ATOM 114 CA SER D 344 43.268 77.290 -11.284 0.00 0.00 ATOM 115 CA GLY D 345 45.936 74.474 -11.213 0.00 0.00 TER