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 B 123 475 UNP P01876 IGHA1_HUMAN 1 353 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 75.278 -24.357 70.996 1.00 0.00 ATOM 2 CA PRO B 232 73.441 -21.159 69.588 1.00 0.00 ATOM 3 CA SER B 233 71.096 -21.838 66.541 1.00 0.00 ATOM 4 CA PRO B 234 72.397 -19.929 63.380 1.00 0.00 ATOM 5 CA SER B 235 69.065 -20.365 61.395 1.00 0.00 ATOM 6 CA THR B 236 67.523 -18.151 58.577 1.00 0.00 ATOM 7 CA PRO B 237 64.149 -19.273 57.060 1.00 0.00 ATOM 8 CA PRO B 238 63.567 -17.828 53.336 1.00 0.00 ATOM 9 CA THR B 239 59.601 -17.988 52.459 1.00 0.00 ATOM 10 CA PRO B 240 58.259 -16.387 49.019 1.00 0.00 ATOM 11 CA SER B 241 54.415 -15.455 48.088 1.00 0.00 ATOM 12 CA PRO B 242 51.360 -16.019 45.670 1.00 0.00 ATOM 13 CA SER B 243 48.917 -13.831 43.661 1.00 0.00 ATOM 14 CA CYS B 244 45.564 -14.094 41.849 1.00 0.00 ATOM 15 CA CYS B 245 44.404 -16.447 38.846 1.00 0.00 ATOM 16 CA HIS B 246 41.166 -15.469 37.080 1.00 0.00 ATOM 17 CA PRO B 247 40.218 -16.579 33.310 0.00 0.00 ATOM 18 CA ARG B 248 38.959 -13.446 31.399 0.00 0.00 ATOM 19 CA LEU B 249 39.291 -12.972 27.549 0.00 0.00 ATOM 20 CA SER B 250 39.431 -9.279 26.366 0.00 0.00 ATOM 21 CA LEU B 251 39.769 -7.759 22.826 0.00 0.00 ATOM 22 CA HIS B 252 41.223 -4.184 22.662 0.00 0.00 ATOM 23 CA ARG B 253 40.481 -2.521 19.225 0.00 0.00 ATOM 24 CA PRO B 254 42.972 -0.459 17.049 0.00 0.00 ATOM 25 CA ALA B 255 43.129 3.388 17.646 0.00 0.00 ATOM 26 CA LEU B 256 41.401 5.764 15.090 0.00 0.00 ATOM 27 CA GLU B 257 44.287 8.329 14.662 0.00 0.00 ATOM 28 CA ASP B 258 47.043 5.645 14.051 0.00 0.00 ATOM 29 CA LEU B 259 44.980 3.569 11.503 0.00 0.00 ATOM 30 CA LEU B 260 44.020 6.783 9.534 0.00 0.00 ATOM 31 CA LEU B 261 47.502 8.511 9.612 0.00 0.00 ATOM 32 CA GLY B 262 49.861 5.929 7.947 0.00 0.00 ATOM 33 CA SER B 263 47.874 2.573 8.144 0.00 0.00 ATOM 34 CA GLU B 264 49.028 1.595 11.717 0.00 0.00 ATOM 35 CA ALA B 265 46.385 -0.714 13.350 0.00 0.00 ATOM 36 CA ASN B 266 46.823 -3.673 15.776 0.00 0.00 ATOM 37 CA LEU B 267 43.871 -5.685 17.167 0.00 0.00 ATOM 38 CA THR B 268 45.044 -6.923 20.565 0.00 0.00 ATOM 39 CA CYS B 269 43.948 -10.176 22.290 0.00 0.00 ATOM 40 CA THR B 270 44.414 -10.428 26.076 0.00 0.00 ATOM 41 CA LEU B 271 43.754 -13.617 28.165 0.00 0.00 ATOM 42 CA THR B 272 43.513 -12.612 31.861 0.00 0.00 ATOM 43 CA GLY B 273 42.704 -15.304 34.528 0.00 0.00 ATOM 44 CA LEU B 274 44.606 -18.474 33.343 0.00 0.00 ATOM 45 CA ARG B 275 45.521 -20.224 36.720 0.00 0.00 ATOM 46 CA ASP B 276 48.866 -21.990 37.694 0.00 0.00 ATOM 47 CA ALA B 277 50.889 -24.469 35.426 0.00 0.00 ATOM 48 CA SER B 278 49.371 -23.334 32.111 0.00 0.00 ATOM 49 CA GLY B 279 49.636 -22.141 28.429 0.00 0.00 ATOM 50 CA VAL B 280 47.283 -20.451 25.867 0.00 0.00 ATOM 51 CA THR B 281 46.938 -21.354 22.111 0.00 0.00 ATOM 52 CA PHE B 282 45.755 -18.533 19.809 0.00 0.00 ATOM 53 CA THR B 283 43.861 -18.837 16.448 0.00 0.00 ATOM 54 CA TRP B 284 43.465 -15.454 14.575 0.00 0.00 ATOM 55 CA THR B 285 41.541 -14.954 11.246 0.00 0.00 ATOM 56 CA PRO B 286 43.782 -13.302 8.526 0.00 0.00 ATOM 57 CA SER B 287 43.198 -9.646 7.370 0.00 0.00 ATOM 58 CA SER B 288 41.722 -9.114 3.820 0.00 0.00 ATOM 59 CA GLY B 289 45.010 -9.169 1.750 0.00 0.00 ATOM 60 CA LYS B 290 45.867 -12.775 2.950 0.00 0.00 ATOM 61 CA SER B 291 47.780 -11.647 6.115 0.00 0.00 ATOM 62 CA ALA B 292 48.024 -13.409 9.562 0.00 0.00 ATOM 63 CA VAL B 293 51.017 -12.371 11.817 0.00 0.00 ATOM 64 CA GLN B 294 51.147 -12.870 15.682 0.00 0.00 ATOM 65 CA GLY B 295 53.488 -12.497 18.781 0.00 0.00 ATOM 66 CA PRO B 296 52.264 -14.113 22.093 0.00 0.00 ATOM 67 CA PRO B 297 54.265 -13.674 25.419 0.00 0.00 ATOM 68 CA GLU B 298 53.065 -15.032 28.857 0.00 0.00 ATOM 69 CA ARG B 299 53.027 -12.292 31.561 0.00 0.00 ATOM 70 CA ASP B 300 52.170 -13.032 35.268 0.00 0.00 ATOM 71 CA LEU B 301 49.813 -10.101 36.301 0.00 0.00 ATOM 72 CA CYS B 302 48.469 -9.809 39.952 0.00 0.00 ATOM 73 CA GLY B 303 49.671 -13.399 40.625 0.00 0.00 ATOM 74 CA CYS B 304 48.529 -15.318 37.438 0.00 0.00 ATOM 75 CA TYR B 305 49.449 -15.760 33.676 0.00 0.00 ATOM 76 CA SER B 306 48.155 -13.534 30.776 0.00 0.00 ATOM 77 CA VAL B 307 48.762 -14.590 27.090 0.00 0.00 ATOM 78 CA SER B 308 48.594 -11.272 25.240 0.00 0.00 ATOM 79 CA SER B 309 48.904 -11.775 21.478 0.00 0.00 ATOM 80 CA VAL B 310 48.735 -8.991 18.817 0.00 0.00 ATOM 81 CA LEU B 311 47.680 -9.092 15.099 0.00 0.00 ATOM 82 CA PRO B 312 49.045 -6.119 12.990 0.00 0.00 ATOM 83 CA GLY B 313 46.480 -4.827 10.411 0.00 0.00 ATOM 84 CA CYS B 314 46.118 -2.452 7.423 0.00 0.00 ATOM 85 CA ALA B 315 43.609 0.483 7.052 0.00 0.00 ATOM 86 CA GLU B 316 41.569 -1.093 4.120 0.00 0.00 ATOM 87 CA PRO B 317 40.170 -4.225 6.014 0.00 0.00 ATOM 88 CA TRP B 318 39.121 -1.959 8.991 0.00 0.00 ATOM 89 CA ASN B 319 37.598 0.824 6.715 0.00 0.00 ATOM 90 CA HIS B 320 35.800 -1.566 4.199 0.00 0.00 ATOM 91 CA GLY B 321 34.342 -4.098 6.765 0.00 0.00 ATOM 92 CA LYS B 322 36.400 -7.128 8.022 0.00 0.00 ATOM 93 CA THR B 323 35.575 -9.416 11.049 0.00 0.00 ATOM 94 CA PHE B 324 38.657 -10.157 13.253 0.00 0.00 ATOM 95 CA THR B 325 38.278 -13.341 15.311 0.00 0.00 ATOM 96 CA CYS B 326 40.642 -14.245 18.187 0.00 0.00 ATOM 97 CA THR B 327 39.856 -17.867 19.118 0.00 0.00 ATOM 98 CA ALA B 328 41.809 -19.093 22.153 0.00 0.00 ATOM 99 CA ALA B 329 42.058 -22.805 23.255 0.00 0.00 ATOM 100 CA TYR B 330 43.114 -24.123 26.767 0.00 0.00 ATOM 101 CA PRO B 331 42.320 -27.598 28.402 0.00 0.00 ATOM 102 CA GLU B 332 40.700 -26.170 31.646 0.00 0.00 ATOM 103 CA SER B 333 38.465 -23.916 29.383 0.00 0.00 ATOM 104 CA LYS B 334 36.103 -26.728 28.091 0.00 0.00 ATOM 105 CA THR B 335 34.674 -24.422 25.333 0.00 0.00 ATOM 106 CA PRO B 336 37.564 -22.647 23.410 0.00 0.00 ATOM 107 CA LEU B 337 36.739 -18.871 23.573 0.00 0.00 ATOM 108 CA THR B 338 36.044 -17.034 20.321 0.00 0.00 ATOM 109 CA ALA B 339 35.876 -13.165 20.334 0.00 0.00 ATOM 110 CA THR B 340 35.169 -11.347 17.006 0.00 0.00 ATOM 111 CA LEU B 341 35.575 -7.620 16.237 0.00 0.00 ATOM 112 CA SER B 342 34.856 -5.265 13.216 0.00 0.00 ATOM 113 CA LYS B 343 33.489 -1.779 12.148 0.00 0.00 ATOM 114 CA SER B 344 30.034 -0.435 13.322 0.00 0.00 ATOM 115 CA GLY B 345 26.475 -0.188 11.801 0.00 0.00 TER