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 ALA SER PRO THR SER PRO LYS VAL PHE PRO LEU SER LEU SEQRES 2 D 108 CYS SER THR GLN PRO ASP GLY ASN VAL VAL ILE ALA CYS SEQRES 3 D 108 LEU VAL GLN GLY PHE PHE PRO GLN GLU PRO LEU SER VAL SEQRES 4 D 108 THR TRP SER GLU SER GLY GLN GLY VAL THR ALA ARG ASN SEQRES 5 D 108 PHE PRO PRO SER GLN ASP ALA SER GLY ASP LEU TYR THR SEQRES 6 D 108 THR SER SER GLN LEU THR LEU PRO ALA THR GLN CYS LEU SEQRES 7 D 108 ALA GLY LYS SER VAL THR CYS HIS VAL LYS HIS TYR THR SEQRES 8 D 108 ASN PRO SER GLN ASP VAL THR VAL PRO CYS PRO VAL PRO SEQRES 9 D 108 SER THR PRO PRO ATOM 1 CA ALA D 123 15.862 168.194 53.313 0.00 0.00 ATOM 2 CA SER D 124 13.194 170.218 51.576 0.00 0.00 ATOM 3 CA PRO D 125 10.275 168.736 49.512 0.00 0.00 ATOM 4 CA THR D 126 10.567 169.645 45.764 0.00 0.00 ATOM 5 CA SER D 127 7.997 168.896 42.977 0.00 0.00 ATOM 6 CA PRO D 128 9.208 167.243 39.678 0.00 0.00 ATOM 7 CA LYS D 129 9.774 169.291 36.492 0.00 0.00 ATOM 8 CA VAL D 130 8.614 167.175 33.527 0.00 0.00 ATOM 9 CA PHE D 131 10.530 167.458 30.201 0.00 0.00 ATOM 10 CA PRO D 132 9.812 165.828 26.794 0.00 0.00 ATOM 11 CA LEU D 133 12.221 163.275 25.276 0.00 0.00 ATOM 12 CA SER D 134 11.543 163.265 21.480 0.00 0.00 ATOM 13 CA LEU D 135 13.571 162.966 18.207 0.00 0.00 ATOM 14 CA CYS D 136 12.876 164.672 14.824 0.00 0.00 ATOM 15 CA SER D 137 14.544 162.380 12.150 0.00 0.00 ATOM 16 CA THR D 138 17.275 161.204 14.655 0.00 0.00 ATOM 17 CA GLN D 139 15.541 157.820 15.490 0.00 0.00 ATOM 18 CA PRO D 140 15.809 154.732 13.137 0.00 0.00 ATOM 19 CA ASP D 141 13.160 154.405 10.303 0.00 0.00 ATOM 20 CA GLY D 142 10.495 151.909 11.611 0.00 0.00 ATOM 21 CA ASN D 143 10.011 152.217 15.430 0.00 0.00 ATOM 22 CA VAL D 144 9.562 155.357 17.623 0.00 0.00 ATOM 23 CA VAL D 145 10.921 155.953 21.194 0.00 0.00 ATOM 24 CA ILE D 146 9.473 158.951 23.078 0.00 0.00 ATOM 25 CA ALA D 147 9.736 159.657 26.796 0.00 0.00 ATOM 26 CA CYS D 148 9.195 162.004 29.769 0.00 0.00 ATOM 27 CA LEU D 149 12.111 162.999 32.045 0.00 0.00 ATOM 28 CA VAL D 150 10.600 163.515 35.595 0.00 0.00 ATOM 29 CA GLN D 151 13.391 165.674 37.057 0.00 0.00 ATOM 30 CA GLY D 152 14.560 167.112 40.411 0.00 0.00 ATOM 31 CA PHE D 153 12.029 165.876 42.978 0.00 0.00 ATOM 32 CA PHE D 154 12.199 164.986 46.710 0.00 0.00 ATOM 33 CA PRO D 155 11.226 162.812 48.417 0.00 0.00 ATOM 34 CA GLN D 156 10.964 159.652 46.157 0.00 0.00 ATOM 35 CA GLU D 157 7.254 158.738 46.980 0.00 0.00 ATOM 36 CA PRO D 158 4.947 156.680 44.611 0.00 0.00 ATOM 37 CA LEU D 159 5.172 158.089 41.053 0.00 0.00 ATOM 38 CA SER D 160 2.191 157.030 38.831 0.00 0.00 ATOM 39 CA VAL D 161 3.164 157.421 35.124 0.00 0.00 ATOM 40 CA THR D 162 0.489 156.646 32.511 0.00 0.00 ATOM 41 CA TRP D 163 0.671 157.266 28.688 0.00 0.00 ATOM 42 CA SER D 164 -2.334 158.269 26.416 0.00 0.00 ATOM 43 CA GLU D 165 -1.680 155.401 23.886 0.00 0.00 ATOM 44 CA SER D 166 -1.893 151.651 24.867 0.00 0.00 ATOM 45 CA GLY D 167 -1.786 148.476 22.663 0.00 0.00 ATOM 46 CA GLN D 168 -0.120 145.129 21.685 0.00 0.00 ATOM 47 CA GLY D 169 3.186 146.523 20.239 0.00 0.00 ATOM 48 CA VAL D 170 3.316 149.721 22.432 0.00 0.00 ATOM 49 CA THR D 171 5.745 149.045 25.366 0.00 0.00 ATOM 50 CA ALA D 172 5.993 151.331 28.448 0.00 0.00 ATOM 51 CA ARG D 173 9.198 151.232 30.567 0.00 0.00 ATOM 52 CA ASN D 174 9.127 153.096 33.920 0.00 0.00 ATOM 53 CA PHE D 175 12.798 153.483 35.089 0.00 0.00 ATOM 54 CA PRO D 176 13.205 153.391 38.970 0.00 0.00 ATOM 55 CA PRO D 177 14.201 156.685 40.779 0.00 0.00 ATOM 56 CA SER D 178 17.960 157.496 40.713 0.00 0.00 ATOM 57 CA GLN D 179 19.353 159.780 43.465 0.00 0.00 ATOM 58 CA ASP D 180 21.806 162.702 42.705 0.00 0.00 ATOM 59 CA ALA D 181 24.636 163.040 45.378 0.00 0.00 ATOM 60 CA SER D 182 23.768 162.896 49.176 0.00 0.00 ATOM 61 CA GLY D 183 19.908 162.871 49.083 0.00 0.00 ATOM 62 CA ASP D 184 19.776 166.199 47.088 0.00 0.00 ATOM 63 CA LEU D 185 17.330 165.404 44.182 0.00 0.00 ATOM 64 CA TYR D 186 15.732 162.262 42.586 0.00 0.00 ATOM 65 CA THR D 187 15.230 161.823 38.767 0.00 0.00 ATOM 66 CA THR D 188 13.150 159.103 36.938 0.00 0.00 ATOM 67 CA SER D 189 12.499 158.623 33.177 0.00 0.00 ATOM 68 CA SER D 190 9.321 157.018 31.639 0.00 0.00 ATOM 69 CA GLN D 191 9.797 155.654 28.055 0.00 0.00 ATOM 70 CA LEU D 192 7.112 154.673 25.450 0.00 0.00 ATOM 71 CA THR D 193 8.400 152.456 22.545 0.00 0.00 ATOM 72 CA LEU D 194 5.754 152.089 19.707 0.00 0.00 ATOM 73 CA PRO D 195 5.729 151.401 15.873 0.00 0.00 ATOM 74 CA ALA D 196 6.310 154.499 13.594 0.00 0.00 ATOM 75 CA THR D 197 2.896 153.829 11.865 0.00 0.00 ATOM 76 CA GLN D 198 1.261 154.282 15.368 0.00 0.00 ATOM 77 CA CYS D 199 3.236 157.547 16.099 0.00 0.00 ATOM 78 CA LEU D 200 3.268 159.629 12.834 0.00 0.00 ATOM 79 CA ALA D 201 5.046 163.057 12.334 0.00 0.00 ATOM 80 CA GLY D 202 2.903 166.034 13.561 0.00 0.00 ATOM 81 CA LYS D 203 1.009 163.836 16.125 0.00 0.00 ATOM 82 CA SER D 204 1.639 163.647 19.942 0.00 0.00 ATOM 83 CA VAL D 205 1.232 161.192 22.915 0.00 0.00 ATOM 84 CA THR D 206 0.374 162.550 26.418 0.00 0.00 ATOM 85 CA CYS D 207 2.366 161.417 29.494 0.00 0.00 ATOM 86 CA HIS D 208 0.365 161.741 32.791 0.00 0.00 ATOM 87 CA VAL D 209 2.567 161.956 35.945 0.00 0.00 ATOM 88 CA LYS D 210 1.112 161.732 39.490 0.00 0.00 ATOM 89 CA HIS D 211 3.621 162.390 42.338 0.00 0.00 ATOM 90 CA TYR D 212 1.966 161.192 45.741 0.00 0.00 ATOM 91 CA THR D 213 -1.542 162.651 46.378 0.00 0.00 ATOM 92 CA ASN D 214 -0.673 165.823 44.363 0.00 0.00 ATOM 93 CA PRO D 215 -2.639 166.855 41.170 0.00 0.00 ATOM 94 CA SER D 216 -1.658 165.121 37.859 0.00 0.00 ATOM 95 CA GLN D 217 1.061 166.866 35.758 0.00 0.00 ATOM 96 CA ASP D 218 0.443 166.298 32.011 0.00 0.00 ATOM 97 CA VAL D 219 2.903 166.749 29.079 0.00 0.00 ATOM 98 CA THR D 220 2.097 166.392 25.363 0.00 0.00 ATOM 99 CA VAL D 221 5.190 164.631 23.848 0.00 0.00 ATOM 100 CA PRO D 222 5.684 164.779 19.979 0.00 0.00 ATOM 101 CA CYS D 223 7.347 164.459 19.040 1.00 0.00 ATOM 102 CA PRO D 224 9.010 164.139 18.101 1.00 0.00 ATOM 103 CA VAL D 225 10.293 161.367 17.208 1.00 0.00 ATOM 104 CA PRO D 226 9.548 157.430 17.618 1.00 0.00 ATOM 105 CA SER D 227 13.000 156.627 15.671 1.00 0.00 ATOM 106 CA THR D 228 15.744 153.890 16.388 1.00 0.00 ATOM 107 CA PRO D 229 17.382 152.727 12.994 1.00 0.00 ATOM 108 CA PRO D 230 20.989 150.957 12.686 1.00 0.00 TER