HEADER IMMUNE SYSTEM 21-MAR-08 3CM9 TITLE Solution Structure of Human SIgA2 COMPND MOL_ID: 3; COMPND 2 MOLECULE: Ig alpha-2 chain C region; COMPND 3 CHAIN: L, M, N, O; EXPDTA SOLUTION SCATTERING DBREF 3CM9 M 1 214 PDB 3CM9 3CM9 1 214 SEQRES 1 M 107 ARG THR VAL ALA ALA PRO SER VAL PHE ILE PHE PRO PRO SEQRES 2 M 107 SER ASP GLU GLN LEU LYS SER GLY THR ALA SER VAL VAL SEQRES 3 M 107 CYS LEU LEU ASN ASN PHE TYR PRO ARG GLU ALA LYS VAL SEQRES 4 M 107 GLN TRP LYS VAL ASP ASN ALA LEU GLN SER GLY ASN SER SEQRES 5 M 107 GLN GLU SER VAL THR GLU GLN ASP SER LYS ASP SER THR SEQRES 6 M 107 TYR SER LEU SER SER THR LEU THR LEU SER LYS ALA ASP SEQRES 7 M 107 TYR GLU LYS HIS LYS VAL TYR ALA CYS GLU VAL THR HIS SEQRES 8 M 107 GLN GLY LEU SER SER PRO VAL THR LYS SER PHE ASN ARG SEQRES 9 M 107 GLY GLU CYS ATOM 1 CA ARG M 108 0.825 137.283 18.645 0.00 0.00 ATOM 2 CA THR M 109 3.858 136.603 20.863 0.00 0.00 ATOM 3 CA VAL M 110 7.470 135.998 19.794 0.00 0.00 ATOM 4 CA ALA M 111 8.520 132.524 18.632 0.00 0.00 ATOM 5 CA ALA M 112 11.998 131.000 18.312 0.00 0.00 ATOM 6 CA PRO M 113 12.591 129.290 14.916 0.00 0.00 ATOM 7 CA SER M 114 14.285 125.896 14.625 0.00 0.00 ATOM 8 CA VAL M 115 17.040 126.385 12.039 0.00 0.00 ATOM 9 CA PHE M 116 17.967 123.580 9.625 0.00 0.00 ATOM 10 CA ILE M 117 20.297 123.314 6.605 0.00 0.00 ATOM 11 CA PHE M 118 20.427 121.185 3.436 0.00 0.00 ATOM 12 CA PRO M 119 23.668 120.585 1.485 0.00 0.00 ATOM 13 CA PRO M 120 23.526 119.748 -2.279 0.00 0.00 ATOM 14 CA SER M 121 22.489 116.225 -3.276 0.00 0.00 ATOM 15 CA ASP M 122 24.567 113.588 -5.083 0.00 0.00 ATOM 16 CA GLU M 123 22.725 113.775 -8.419 0.00 0.00 ATOM 17 CA GLN M 124 22.602 117.592 -8.397 0.00 0.00 ATOM 18 CA LEU M 125 26.381 118.029 -8.724 0.00 0.00 ATOM 19 CA LYS M 126 26.484 116.048 -12.004 0.00 0.00 ATOM 20 CA SER M 127 25.302 118.993 -14.070 0.00 0.00 ATOM 21 CA GLY M 128 27.808 121.353 -12.458 0.00 0.00 ATOM 22 CA THR M 129 25.947 123.335 -9.795 0.00 0.00 ATOM 23 CA ALA M 130 25.206 123.353 -6.044 0.00 0.00 ATOM 24 CA SER M 131 22.511 124.774 -3.757 0.00 0.00 ATOM 25 CA VAL M 132 22.667 124.879 0.050 0.00 0.00 ATOM 26 CA VAL M 133 19.302 125.570 1.709 0.00 0.00 ATOM 27 CA CYS M 134 18.857 126.878 5.279 0.00 0.00 ATOM 28 CA LEU M 135 15.482 126.620 7.042 0.00 0.00 ATOM 29 CA LEU M 136 13.950 128.841 9.752 0.00 0.00 ATOM 30 CA ASN M 137 10.801 126.858 10.622 0.00 0.00 ATOM 31 CA ASN M 138 8.063 128.557 12.712 0.00 0.00 ATOM 32 CA PHE M 139 8.672 132.137 13.929 0.00 0.00 ATOM 33 CA TYR M 140 7.195 135.574 14.652 0.00 0.00 ATOM 34 CA PRO M 141 7.600 138.320 13.604 0.00 0.00 ATOM 35 CA ARG M 142 8.766 137.975 9.996 0.00 0.00 ATOM 36 CA GLU M 143 11.754 140.166 10.912 0.00 0.00 ATOM 37 CA ALA M 144 14.729 137.814 10.649 0.00 0.00 ATOM 38 CA LYS M 145 18.266 137.661 9.251 0.00 0.00 ATOM 39 CA VAL M 146 20.379 134.978 7.578 0.00 0.00 ATOM 40 CA GLN M 147 24.152 135.216 7.108 0.00 0.00 ATOM 41 CA TRP M 148 26.006 132.434 5.269 0.00 0.00 ATOM 42 CA LYS M 149 29.381 131.319 6.606 0.00 0.00 ATOM 43 CA VAL M 150 31.768 129.869 4.026 0.00 0.00 ATOM 44 CA ASP M 151 35.182 128.923 5.465 0.00 0.00 ATOM 45 CA ASN M 152 34.378 130.499 8.860 0.00 0.00 ATOM 46 CA ALA M 153 34.671 134.301 8.583 0.00 0.00 ATOM 47 CA LEU M 154 34.310 134.572 4.796 0.00 0.00 ATOM 48 CA GLN M 155 30.772 135.883 4.302 0.00 0.00 ATOM 49 CA SER M 156 29.311 135.657 0.795 0.00 0.00 ATOM 50 CA GLY M 157 26.615 137.739 -0.885 0.00 0.00 ATOM 51 CA ASN M 158 24.787 135.778 -3.582 0.00 0.00 ATOM 52 CA SER M 159 21.714 134.359 -1.841 0.00 0.00 ATOM 53 CA GLN M 160 17.922 134.515 -2.308 0.00 0.00 ATOM 54 CA GLU M 161 15.317 134.886 0.453 0.00 0.00 ATOM 55 CA SER M 162 11.662 133.831 0.182 0.00 0.00 ATOM 56 CA VAL M 163 8.946 134.038 2.842 0.00 0.00 ATOM 57 CA THR M 164 5.556 132.330 2.608 0.00 0.00 ATOM 58 CA GLU M 165 2.185 133.802 3.599 0.00 0.00 ATOM 59 CA GLN M 166 1.021 133.499 7.233 0.00 0.00 ATOM 60 CA ASP M 167 -0.899 130.244 7.849 0.00 0.00 ATOM 61 CA SER M 168 -4.395 129.792 9.312 0.00 0.00 ATOM 62 CA LYS M 169 -3.384 128.032 12.554 0.00 0.00 ATOM 63 CA ASP M 170 -0.765 129.425 14.945 0.00 0.00 ATOM 64 CA SER M 171 -0.108 132.663 13.021 0.00 0.00 ATOM 65 CA THR M 172 3.632 132.463 12.256 0.00 0.00 ATOM 66 CA TYR M 173 6.221 132.879 9.483 0.00 0.00 ATOM 67 CA SER M 174 8.994 130.719 8.021 0.00 0.00 ATOM 68 CA LEU M 175 11.999 131.409 5.763 0.00 0.00 ATOM 69 CA SER M 176 14.656 129.704 3.631 0.00 0.00 ATOM 70 CA SER M 177 18.007 130.625 2.073 0.00 0.00 ATOM 71 CA THR M 178 19.629 128.952 -0.938 0.00 0.00 ATOM 72 CA LEU M 179 23.317 129.548 -1.678 0.00 0.00 ATOM 73 CA THR M 180 23.860 128.908 -5.396 0.00 0.00 ATOM 74 CA LEU M 181 27.486 128.125 -6.297 0.00 0.00 ATOM 75 CA SER M 182 28.770 125.926 -9.134 0.00 0.00 ATOM 76 CA LYS M 183 30.581 122.603 -8.631 0.00 0.00 ATOM 77 CA ALA M 184 34.023 124.188 -9.103 0.00 0.00 ATOM 78 CA ASP M 185 33.573 126.605 -6.195 0.00 0.00 ATOM 79 CA TYR M 186 31.887 123.936 -4.046 0.00 0.00 ATOM 80 CA GLU M 187 34.641 121.306 -4.309 0.00 0.00 ATOM 81 CA LYS M 188 36.989 123.936 -2.863 0.00 0.00 ATOM 82 CA HIS M 189 35.461 124.664 0.561 0.00 0.00 ATOM 83 CA LYS M 190 34.552 122.636 3.654 0.00 0.00 ATOM 84 CA VAL M 191 32.688 124.576 6.366 0.00 0.00 ATOM 85 CA TYR M 192 29.170 125.853 5.589 0.00 0.00 ATOM 86 CA ALA M 193 27.227 127.486 8.439 0.00 0.00 ATOM 87 CA CYS M 194 24.139 129.738 8.530 0.00 0.00 ATOM 88 CA GLU M 195 23.887 132.312 11.352 0.00 0.00 ATOM 89 CA VAL M 196 20.349 133.444 12.270 0.00 0.00 ATOM 90 CA THR M 197 19.221 136.485 14.289 0.00 0.00 ATOM 91 CA HIS M 198 15.717 136.773 15.767 0.00 0.00 ATOM 92 CA GLN M 199 14.018 138.290 18.823 0.00 0.00 ATOM 93 CA GLY M 200 12.921 134.870 20.051 0.00 0.00 ATOM 94 CA LEU M 201 16.494 133.576 20.028 0.00 0.00 ATOM 95 CA SER M 202 18.633 134.465 23.050 0.00 0.00 ATOM 96 CA SER M 203 21.773 134.100 20.914 0.00 0.00 ATOM 97 CA PRO M 204 22.462 133.428 17.182 0.00 0.00 ATOM 98 CA VAL M 205 21.991 129.769 16.240 0.00 0.00 ATOM 99 CA THR M 206 24.690 128.284 14.001 0.00 0.00 ATOM 100 CA LYS M 207 24.035 125.268 11.760 0.00 0.00 ATOM 101 CA SER M 208 27.140 123.979 9.980 0.00 0.00 ATOM 102 CA PHE M 209 28.258 120.815 8.185 0.00 0.00 ATOM 103 CA ASN M 210 31.595 119.526 6.916 0.00 0.00 ATOM 104 CA ARG M 211 32.341 118.501 3.323 0.00 0.00 ATOM 105 CA GLY M 212 33.692 115.000 2.861 0.00 0.00 ATOM 106 CA GLU M 213 31.458 112.033 3.658 0.00 0.00 ATOM 107 CA CYS M 214 34.211 109.505 3.152 0.00 0.00 TER