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 A 123 475 UNP P01876 IGHA1_HUMAN 1 353 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 55.444 -91.394 28.566 0.00 0.00 ATOM 2 CA SER A 124 52.836 -93.092 30.700 0.00 0.00 ATOM 3 CA PRO A 125 49.198 -91.855 31.162 0.00 0.00 ATOM 4 CA THR A 126 48.525 -90.713 34.795 0.00 0.00 ATOM 5 CA SER A 127 45.141 -89.616 36.304 0.00 0.00 ATOM 6 CA PRO A 128 44.949 -86.298 38.312 0.00 0.00 ATOM 7 CA LYS A 129 44.929 -86.263 42.142 0.00 0.00 ATOM 8 CA VAL A 130 42.533 -83.504 43.266 0.00 0.00 ATOM 9 CA PHE A 131 43.376 -81.520 46.455 0.00 0.00 ATOM 10 CA PRO A 132 41.357 -78.801 48.276 0.00 0.00 ATOM 11 CA LEU A 133 42.639 -75.205 48.503 0.00 0.00 ATOM 12 CA SER A 134 40.864 -73.609 51.531 0.00 0.00 ATOM 13 CA LEU A 135 41.711 -71.138 54.377 0.00 0.00 ATOM 14 CA CYS A 136 40.387 -71.144 57.993 0.00 0.00 ATOM 15 CA SER A 137 40.682 -67.452 59.206 0.00 0.00 ATOM 16 CA THR A 138 43.748 -66.793 56.909 0.00 0.00 ATOM 17 CA GLN A 139 41.708 -65.000 54.119 0.00 0.00 ATOM 18 CA PRO A 140 40.635 -61.272 54.425 0.00 0.00 ATOM 19 CA ASP A 141 37.247 -60.523 56.190 0.00 0.00 ATOM 20 CA GLY A 142 34.658 -59.985 53.354 0.00 0.00 ATOM 21 CA ASN A 143 35.414 -62.216 50.294 0.00 0.00 ATOM 22 CA VAL A 144 36.281 -65.969 50.123 0.00 0.00 ATOM 23 CA VAL A 145 38.741 -67.714 47.700 0.00 0.00 ATOM 24 CA ILE A 146 38.553 -71.532 47.556 0.00 0.00 ATOM 25 CA ALA A 147 40.058 -73.794 44.909 0.00 0.00 ATOM 26 CA CYS A 148 40.914 -77.304 43.647 0.00 0.00 ATOM 27 CA LEU A 149 44.517 -78.244 42.746 0.00 0.00 ATOM 28 CA VAL A 150 44.278 -80.853 39.868 0.00 0.00 ATOM 29 CA GLN A 151 47.750 -82.397 40.252 0.00 0.00 ATOM 30 CA GLY A 152 50.136 -84.786 38.438 0.00 0.00 ATOM 31 CA PHE A 153 48.299 -85.832 35.267 0.00 0.00 ATOM 32 CA PHE A 154 49.404 -86.831 31.727 0.00 0.00 ATOM 33 CA PRO A 155 48.576 -86.190 28.990 0.00 0.00 ATOM 34 CA GLN A 156 47.022 -82.622 29.099 0.00 0.00 ATOM 35 CA GLU A 157 43.627 -83.485 27.366 0.00 0.00 ATOM 36 CA PRO A 158 40.353 -81.434 27.859 0.00 0.00 ATOM 37 CA LEU A 159 39.775 -80.812 31.597 0.00 0.00 ATOM 38 CA SER A 160 36.116 -79.867 32.407 0.00 0.00 ATOM 39 CA VAL A 161 35.986 -78.098 35.830 0.00 0.00 ATOM 40 CA THR A 162 32.550 -77.097 37.164 0.00 0.00 ATOM 41 CA TRP A 163 31.695 -75.720 40.685 0.00 0.00 ATOM 42 CA SER A 164 28.410 -76.440 42.657 0.00 0.00 ATOM 43 CA GLU A 165 27.687 -72.680 43.286 0.00 0.00 ATOM 44 CA SER A 166 27.036 -70.160 40.405 0.00 0.00 ATOM 45 CA GLY A 167 25.840 -66.484 40.516 0.00 0.00 ATOM 46 CA GLN A 168 26.434 -62.741 39.755 0.00 0.00 ATOM 47 CA GLY A 169 29.361 -62.104 42.204 0.00 0.00 ATOM 48 CA VAL A 170 30.779 -65.715 42.149 0.00 0.00 ATOM 49 CA THR A 171 33.791 -65.767 39.725 0.00 0.00 ATOM 50 CA ALA A 172 35.403 -69.021 38.458 0.00 0.00 ATOM 51 CA ARG A 173 39.011 -68.898 37.134 0.00 0.00 ATOM 52 CA ASN A 174 40.324 -72.042 35.368 0.00 0.00 ATOM 53 CA PHE A 175 44.176 -71.710 35.163 0.00 0.00 ATOM 54 CA PRO A 176 45.704 -73.353 31.969 0.00 0.00 ATOM 55 CA PRO A 177 47.833 -76.576 32.415 0.00 0.00 ATOM 56 CA SER A 178 51.481 -75.973 33.474 0.00 0.00 ATOM 57 CA GLN A 179 54.064 -78.691 32.652 0.00 0.00 ATOM 58 CA ASP A 180 56.704 -79.907 35.236 0.00 0.00 ATOM 59 CA ALA A 181 60.214 -80.529 33.637 0.00 0.00 ATOM 60 CA SER A 182 60.519 -82.508 30.290 0.00 0.00 ATOM 61 CA GLY A 183 56.886 -83.709 29.775 0.00 0.00 ATOM 62 CA ASP A 184 56.825 -85.515 33.211 0.00 0.00 ATOM 63 CA LEU A 185 53.514 -84.283 34.812 0.00 0.00 ATOM 64 CA TYR A 186 50.916 -81.483 34.183 0.00 0.00 ATOM 65 CA THR A 187 49.212 -79.467 37.023 0.00 0.00 ATOM 66 CA THR A 188 46.180 -77.060 36.744 0.00 0.00 ATOM 67 CA SER A 189 44.346 -75.088 39.491 0.00 0.00 ATOM 68 CA SER A 190 40.602 -74.089 39.412 0.00 0.00 ATOM 69 CA GLN A 191 39.696 -71.111 41.702 0.00 0.00 ATOM 70 CA LEU A 192 36.212 -69.948 42.918 0.00 0.00 ATOM 71 CA THR A 193 36.099 -66.332 44.306 0.00 0.00 ATOM 72 CA LEU A 194 32.705 -65.547 46.054 0.00 0.00 ATOM 73 CA PRO A 195 31.391 -63.167 48.842 0.00 0.00 ATOM 74 CA ALA A 196 31.866 -64.416 52.495 0.00 0.00 ATOM 75 CA THR A 197 28.029 -64.164 53.046 0.00 0.00 ATOM 76 CA GLN A 198 27.646 -66.739 50.155 0.00 0.00 ATOM 77 CA CYS A 199 30.360 -69.104 51.621 0.00 0.00 ATOM 78 CA LEU A 200 29.823 -69.233 55.455 0.00 0.00 ATOM 79 CA ALA A 201 32.013 -71.207 57.997 0.00 0.00 ATOM 80 CA GLY A 202 30.976 -74.923 58.279 0.00 0.00 ATOM 81 CA LYS A 203 29.543 -74.975 54.682 0.00 0.00 ATOM 82 CA SER A 204 31.240 -76.434 51.522 0.00 0.00 ATOM 83 CA VAL A 205 31.265 -75.983 47.672 0.00 0.00 ATOM 84 CA THR A 206 31.788 -79.043 45.387 0.00 0.00 ATOM 85 CA CYS A 207 34.346 -78.934 42.530 0.00 0.00 ATOM 86 CA HIS A 208 33.536 -81.426 39.683 0.00 0.00 ATOM 87 CA VAL A 209 36.580 -82.383 37.525 0.00 0.00 ATOM 88 CA LYS A 210 36.244 -84.369 34.257 0.00 0.00 ATOM 89 CA HIS A 211 39.571 -85.441 32.640 0.00 0.00 ATOM 90 CA TYR A 212 38.812 -86.629 28.929 0.00 0.00 ATOM 91 CA THR A 213 36.023 -89.274 28.670 0.00 0.00 ATOM 92 CA ASN A 214 36.859 -90.614 32.187 0.00 0.00 ATOM 93 CA PRO A 215 34.271 -90.578 35.091 0.00 0.00 ATOM 94 CA SER A 216 33.846 -87.262 37.030 0.00 0.00 ATOM 95 CA GLN A 217 36.098 -86.792 40.121 0.00 0.00 ATOM 96 CA ASP A 218 34.282 -84.745 42.816 0.00 0.00 ATOM 97 CA VAL A 219 35.784 -82.907 45.852 0.00 0.00 ATOM 98 CA THR A 220 33.844 -81.109 48.606 0.00 0.00 ATOM 99 CA VAL A 221 35.922 -77.936 49.364 0.00 0.00 ATOM 100 CA PRO A 222 35.250 -76.049 52.714 0.00 0.00 ATOM 101 CA CYS A 223 36.455 -74.792 53.566 0.00 0.00 ATOM 102 CA PRO A 224 37.660 -73.541 54.417 1.00 0.00 ATOM 103 CA VAL A 225 38.035 -70.432 53.840 1.00 0.00 ATOM 104 CA PRO A 226 36.679 -67.663 51.250 1.00 0.00 ATOM 105 CA SER A 227 39.155 -64.947 52.941 1.00 0.00 ATOM 106 CA THR A 228 41.383 -62.157 51.273 1.00 0.00 ATOM 107 CA PRO A 229 41.659 -59.052 53.690 1.00 0.00 ATOM 108 CA PRO A 230 44.577 -56.280 53.524 1.00 0.00 TER