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 108 ALA SER PRO THR SER PRO LYS VAL PHE PRO LEU SER LEU SEQRES 2 B 108 CYS SER THR GLN PRO ASP GLY ASN VAL VAL ILE ALA CYS SEQRES 3 B 108 LEU VAL GLN GLY PHE PHE PRO GLN GLU PRO LEU SER VAL SEQRES 4 B 108 THR TRP SER GLU SER GLY GLN GLY VAL THR ALA ARG ASN SEQRES 5 B 108 PHE PRO PRO SER GLN ASP ALA SER GLY ASP LEU TYR THR SEQRES 6 B 108 THR SER SER GLN LEU THR LEU PRO ALA THR GLN CYS LEU SEQRES 7 B 108 ALA GLY LYS SER VAL THR CYS HIS VAL LYS HIS TYR THR SEQRES 8 B 108 ASN PRO SER GLN ASP VAL THR VAL PRO CYS PRO VAL PRO SEQRES 9 B 108 SER THR PRO PRO ATOM 1 CA ALA B 123 75.642 -13.602 117.796 0.00 0.00 ATOM 2 CA SER B 124 79.371 -14.093 117.494 0.00 0.00 ATOM 3 CA PRO B 125 81.648 -12.297 114.932 0.00 0.00 ATOM 4 CA THR B 126 83.145 -14.774 112.365 0.00 0.00 ATOM 5 CA SER B 127 85.756 -13.996 109.624 0.00 0.00 ATOM 6 CA PRO B 128 85.081 -15.154 105.982 0.00 0.00 ATOM 7 CA LYS B 129 86.738 -18.284 104.525 0.00 0.00 ATOM 8 CA VAL B 130 87.606 -17.553 100.874 0.00 0.00 ATOM 9 CA PHE B 131 87.355 -20.414 98.312 0.00 0.00 ATOM 10 CA PRO B 132 88.260 -20.469 94.578 0.00 0.00 ATOM 11 CA LEU B 133 85.577 -20.957 91.898 0.00 0.00 ATOM 12 CA SER B 134 87.398 -22.269 88.762 0.00 0.00 ATOM 13 CA LEU B 135 86.746 -24.794 85.913 0.00 0.00 ATOM 14 CA CYS B 136 89.304 -27.024 84.093 0.00 0.00 ATOM 15 CA SER B 137 87.731 -27.760 80.602 0.00 0.00 ATOM 16 CA THR B 138 84.121 -27.509 82.018 0.00 0.00 ATOM 17 CA GLN B 139 83.514 -23.874 80.770 0.00 0.00 ATOM 18 CA PRO B 140 82.546 -23.093 77.083 0.00 0.00 ATOM 19 CA ASP B 141 85.451 -22.565 74.543 0.00 0.00 ATOM 20 CA GLY B 142 85.868 -18.726 74.182 0.00 0.00 ATOM 21 CA ASN B 143 85.113 -16.895 77.497 0.00 0.00 ATOM 22 CA VAL B 144 86.305 -17.670 81.079 0.00 0.00 ATOM 23 CA VAL B 145 84.313 -17.256 84.368 0.00 0.00 ATOM 24 CA ILE B 146 86.332 -17.472 87.611 0.00 0.00 ATOM 25 CA ALA B 147 85.218 -16.400 91.074 0.00 0.00 ATOM 26 CA CYS B 148 85.818 -16.246 94.849 0.00 0.00 ATOM 27 CA LEU B 149 83.229 -17.628 97.312 0.00 0.00 ATOM 28 CA VAL B 150 83.485 -15.431 100.514 0.00 0.00 ATOM 29 CA GLN B 151 81.856 -17.864 102.965 0.00 0.00 ATOM 30 CA GLY B 152 80.511 -17.983 106.552 0.00 0.00 ATOM 31 CA PHE B 153 81.031 -14.473 107.942 0.00 0.00 ATOM 32 CA PHE B 154 79.182 -12.296 110.511 0.00 0.00 ATOM 33 CA PRO B 155 78.283 -9.512 110.673 0.00 0.00 ATOM 34 CA GLN B 156 77.671 -8.323 107.017 0.00 0.00 ATOM 35 CA GLU B 157 79.880 -5.102 107.148 0.00 0.00 ATOM 36 CA PRO B 158 81.484 -3.441 104.008 0.00 0.00 ATOM 37 CA LEU B 159 83.221 -6.118 101.881 0.00 0.00 ATOM 38 CA SER B 160 85.812 -4.629 99.429 0.00 0.00 ATOM 39 CA VAL B 161 86.492 -7.164 96.608 0.00 0.00 ATOM 40 CA THR B 162 89.116 -6.225 93.994 0.00 0.00 ATOM 41 CA TRP B 163 90.581 -8.481 91.202 0.00 0.00 ATOM 42 CA SER B 164 94.244 -8.349 89.877 0.00 0.00 ATOM 43 CA GLU B 165 93.141 -8.026 86.172 0.00 0.00 ATOM 44 CA SER B 166 91.092 -5.007 84.849 0.00 0.00 ATOM 45 CA GLY B 167 90.158 -4.008 81.232 0.00 0.00 ATOM 46 CA GLN B 168 87.483 -3.281 78.539 0.00 0.00 ATOM 47 CA GLY B 169 86.044 -6.855 78.167 0.00 0.00 ATOM 48 CA VAL B 170 86.804 -8.019 81.790 0.00 0.00 ATOM 49 CA THR B 171 83.539 -7.715 83.838 0.00 0.00 ATOM 50 CA ALA B 172 83.446 -7.950 87.676 0.00 0.00 ATOM 51 CA ARG B 173 80.129 -8.865 89.388 0.00 0.00 ATOM 52 CA ASN B 174 79.986 -8.510 93.209 0.00 0.00 ATOM 53 CA PHE B 175 76.865 -10.456 94.418 0.00 0.00 ATOM 54 CA PRO B 176 75.179 -8.873 97.563 0.00 0.00 ATOM 55 CA PRO B 177 75.429 -10.802 100.930 0.00 0.00 ATOM 56 CA SER B 178 72.870 -13.640 101.367 0.00 0.00 ATOM 57 CA GLN B 179 71.977 -14.722 104.939 0.00 0.00 ATOM 58 CA ASP B 180 71.755 -18.459 105.993 0.00 0.00 ATOM 59 CA ALA B 181 68.769 -19.177 108.407 0.00 0.00 ATOM 60 CA SER B 182 68.096 -16.828 111.444 0.00 0.00 ATOM 61 CA GLY B 183 71.187 -14.514 111.325 0.00 0.00 ATOM 62 CA ASP B 184 73.639 -17.511 111.570 0.00 0.00 ATOM 63 CA LEU B 185 76.171 -16.834 108.708 0.00 0.00 ATOM 64 CA TYR B 186 76.402 -14.540 105.597 0.00 0.00 ATOM 65 CA THR B 187 77.875 -15.692 102.201 0.00 0.00 ATOM 66 CA THR B 188 78.782 -13.490 99.135 0.00 0.00 ATOM 67 CA SER B 189 80.337 -14.495 95.760 0.00 0.00 ATOM 68 CA SER B 190 82.576 -12.223 93.559 0.00 0.00 ATOM 69 CA GLN B 191 82.728 -13.255 89.837 0.00 0.00 ATOM 70 CA LEU B 192 85.254 -12.172 87.114 0.00 0.00 ATOM 71 CA THR B 193 84.101 -12.833 83.475 0.00 0.00 ATOM 72 CA LEU B 194 86.982 -12.282 80.909 0.00 0.00 ATOM 73 CA PRO B 195 87.958 -13.565 77.363 0.00 0.00 ATOM 74 CA ALA B 196 89.826 -16.974 77.253 0.00 0.00 ATOM 75 CA THR B 197 92.789 -15.252 75.421 0.00 0.00 ATOM 76 CA GLN B 198 93.129 -12.961 78.547 0.00 0.00 ATOM 77 CA CYS B 199 92.953 -15.955 81.020 0.00 0.00 ATOM 78 CA LEU B 200 95.082 -18.818 79.516 0.00 0.00 ATOM 79 CA ALA B 201 95.563 -22.358 81.063 0.00 0.00 ATOM 80 CA GLY B 202 98.346 -22.439 83.746 0.00 0.00 ATOM 81 CA LYS B 203 97.875 -18.690 84.594 0.00 0.00 ATOM 82 CA SER B 204 95.987 -17.210 87.635 0.00 0.00 ATOM 83 CA VAL B 205 94.066 -14.010 88.683 0.00 0.00 ATOM 84 CA THR B 206 94.243 -12.779 92.333 0.00 0.00 ATOM 85 CA CYS B 207 91.045 -11.848 94.237 0.00 0.00 ATOM 86 CA HIS B 208 91.681 -9.344 97.117 0.00 0.00 ATOM 87 CA VAL B 209 88.968 -9.383 99.854 0.00 0.00 ATOM 88 CA LYS B 210 88.811 -6.739 102.633 0.00 0.00 ATOM 89 CA HIS B 211 86.180 -7.394 105.372 0.00 0.00 ATOM 90 CA TYR B 212 85.739 -4.059 107.476 0.00 0.00 ATOM 91 CA THR B 213 89.045 -2.592 108.803 0.00 0.00 ATOM 92 CA ASN B 214 90.633 -6.104 108.952 0.00 0.00 ATOM 93 CA PRO B 215 93.800 -7.040 106.894 0.00 0.00 ATOM 94 CA SER B 216 93.269 -8.011 103.192 0.00 0.00 ATOM 95 CA GLN B 217 92.699 -11.754 102.475 0.00 0.00 ATOM 96 CA ASP B 218 94.174 -12.718 99.063 0.00 0.00 ATOM 97 CA VAL B 219 93.440 -15.838 96.924 0.00 0.00 ATOM 98 CA THR B 220 95.163 -16.810 93.659 0.00 0.00 ATOM 99 CA VAL B 221 92.369 -18.376 91.509 0.00 0.00 ATOM 100 CA PRO B 222 93.316 -20.518 88.401 0.00 0.00 ATOM 101 CA CYS B 223 92.152 -21.744 87.458 1.00 0.00 ATOM 102 CA PRO B 224 90.987 -22.970 86.515 1.00 0.00 ATOM 103 CA VAL B 225 88.874 -22.345 84.216 1.00 0.00 ATOM 104 CA PRO B 226 87.347 -19.138 82.319 1.00 0.00 ATOM 105 CA SER B 227 84.860 -21.593 80.284 1.00 0.00 ATOM 106 CA THR B 228 81.057 -21.146 79.343 1.00 0.00 ATOM 107 CA PRO B 229 80.323 -22.921 75.899 1.00 0.00 ATOM 108 CA PRO B 230 76.670 -24.094 74.667 1.00 0.00 TER