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 L 1 214 PDB 3CM9 3CM9 1 214 SEQRES 1 L 107 ARG THR VAL ALA ALA PRO SER VAL PHE ILE PHE PRO PRO SEQRES 2 L 107 SER ASP GLU GLN LEU LYS SER GLY THR ALA SER VAL VAL SEQRES 3 L 107 CYS LEU LEU ASN ASN PHE TYR PRO ARG GLU ALA LYS VAL SEQRES 4 L 107 GLN TRP LYS VAL ASP ASN ALA LEU GLN SER GLY ASN SER SEQRES 5 L 107 GLN GLU SER VAL THR GLU GLN ASP SER LYS ASP SER THR SEQRES 6 L 107 TYR SER LEU SER SER THR LEU THR LEU SER LYS ALA ASP SEQRES 7 L 107 TYR GLU LYS HIS LYS VAL TYR ALA CYS GLU VAL THR HIS SEQRES 8 L 107 GLN GLY LEU SER SER PRO VAL THR LYS SER PHE ASN ARG SEQRES 9 L 107 GLY GLU CYS ATOM 1 CA ARG L 108 4.646 54.169 47.978 0.00 0.00 ATOM 2 CA THR L 109 3.125 53.223 44.605 0.00 0.00 ATOM 3 CA VAL L 110 4.926 52.012 41.466 0.00 0.00 ATOM 4 CA ALA L 111 6.548 54.555 39.140 0.00 0.00 ATOM 5 CA ALA L 112 7.668 54.192 35.516 0.00 0.00 ATOM 6 CA PRO L 113 11.244 55.478 34.901 0.00 0.00 ATOM 7 CA SER L 114 12.125 57.637 31.892 0.00 0.00 ATOM 8 CA VAL L 115 15.152 55.911 30.345 0.00 0.00 ATOM 9 CA PHE L 116 17.877 57.996 28.671 0.00 0.00 ATOM 10 CA ILE L 117 21.280 57.247 27.099 0.00 0.00 ATOM 11 CA PHE L 118 24.589 59.109 26.672 0.00 0.00 ATOM 12 CA PRO L 119 27.216 58.209 24.026 0.00 0.00 ATOM 13 CA PRO L 120 30.958 58.927 24.587 0.00 0.00 ATOM 14 CA SER L 121 32.038 62.528 24.005 0.00 0.00 ATOM 15 CA ASP L 122 34.432 63.790 21.323 0.00 0.00 ATOM 16 CA GLU L 123 37.296 64.651 23.689 0.00 0.00 ATOM 17 CA GLN L 124 36.929 61.386 25.636 0.00 0.00 ATOM 18 CA LEU L 125 37.948 59.165 22.703 0.00 0.00 ATOM 19 CA LYS L 126 41.337 60.925 22.346 0.00 0.00 ATOM 20 CA SER L 127 42.886 58.986 25.205 0.00 0.00 ATOM 21 CA GLY L 128 41.604 55.665 23.878 0.00 0.00 ATOM 22 CA THR L 129 38.470 54.781 25.849 0.00 0.00 ATOM 23 CA ALA L 130 34.658 55.052 25.704 0.00 0.00 ATOM 24 CA SER L 131 31.782 55.068 28.202 0.00 0.00 ATOM 25 CA VAL L 132 28.086 54.784 27.320 0.00 0.00 ATOM 26 CA VAL L 133 25.751 55.800 30.161 0.00 0.00 ATOM 27 CA CYS L 134 22.075 54.769 30.425 0.00 0.00 ATOM 28 CA LEU L 135 19.713 56.597 32.800 0.00 0.00 ATOM 29 CA LEU L 136 16.589 55.340 34.612 0.00 0.00 ATOM 30 CA ASN L 137 15.281 58.587 36.144 0.00 0.00 ATOM 31 CA ASN L 138 12.567 58.393 38.854 0.00 0.00 ATOM 32 CA PHE L 139 11.206 54.943 39.811 0.00 0.00 ATOM 33 CA TYR L 140 9.935 52.648 42.573 0.00 0.00 ATOM 34 CA PRO L 141 10.811 50.080 43.777 0.00 0.00 ATOM 35 CA ARG L 142 14.596 49.903 43.377 0.00 0.00 ATOM 36 CA GLU L 143 14.108 46.508 41.701 0.00 0.00 ATOM 37 CA ALA L 144 15.137 47.113 38.091 0.00 0.00 ATOM 38 CA LYS L 145 17.205 45.553 35.303 0.00 0.00 ATOM 39 CA VAL L 146 19.470 46.904 32.563 0.00 0.00 ATOM 40 CA GLN L 147 20.648 44.863 29.570 0.00 0.00 ATOM 41 CA TRP L 148 23.033 46.429 27.035 0.00 0.00 ATOM 42 CA LYS L 149 22.476 45.715 23.347 0.00 0.00 ATOM 43 CA VAL L 150 25.581 45.878 21.161 0.00 0.00 ATOM 44 CA ASP L 151 24.909 44.991 17.504 0.00 0.00 ATOM 45 CA ASN L 152 21.305 43.928 18.235 0.00 0.00 ATOM 46 CA ALA L 153 21.332 40.475 19.877 0.00 0.00 ATOM 47 CA LEU L 154 24.943 40.515 21.107 0.00 0.00 ATOM 48 CA GLN L 155 24.629 41.117 24.851 0.00 0.00 ATOM 49 CA SER L 156 27.790 42.116 26.721 0.00 0.00 ATOM 50 CA GLY L 157 28.737 41.664 30.371 0.00 0.00 ATOM 51 CA ASN L 158 31.175 44.334 31.544 0.00 0.00 ATOM 52 CA SER L 159 28.987 47.031 33.106 0.00 0.00 ATOM 53 CA GLN L 160 28.690 48.760 36.502 0.00 0.00 ATOM 54 CA GLU L 161 25.452 49.640 38.318 0.00 0.00 ATOM 55 CA SER L 162 25.089 52.353 40.973 0.00 0.00 ATOM 56 CA VAL L 163 21.942 53.432 42.824 0.00 0.00 ATOM 57 CA THR L 164 21.645 56.585 44.932 0.00 0.00 ATOM 58 CA GLU L 165 19.898 56.924 48.300 0.00 0.00 ATOM 59 CA GLN L 166 16.144 57.664 48.379 0.00 0.00 ATOM 60 CA ASP L 167 15.430 61.425 48.312 0.00 0.00 ATOM 61 CA SER L 168 13.355 63.490 50.759 0.00 0.00 ATOM 62 CA LYS L 169 10.527 64.449 48.369 0.00 0.00 ATOM 63 CA ASP L 170 8.588 61.894 46.312 0.00 0.00 ATOM 64 CA SER L 171 10.334 58.797 47.721 0.00 0.00 ATOM 65 CA THR L 172 11.830 57.162 44.607 0.00 0.00 ATOM 66 CA TYR L 173 15.012 55.604 43.188 0.00 0.00 ATOM 67 CA SER L 174 17.157 56.172 40.093 0.00 0.00 ATOM 68 CA LEU L 175 19.895 54.158 38.345 0.00 0.00 ATOM 69 CA SER L 176 22.637 54.400 35.712 0.00 0.00 ATOM 70 CA SER L 177 24.740 51.999 33.635 0.00 0.00 ATOM 71 CA THR L 178 28.136 52.742 32.080 0.00 0.00 ATOM 72 CA LEU L 179 29.530 50.440 29.388 0.00 0.00 ATOM 73 CA THR L 180 33.322 50.828 29.398 0.00 0.00 ATOM 74 CA LEU L 181 34.974 49.764 26.125 0.00 0.00 ATOM 75 CA SER L 182 38.179 51.127 24.571 0.00 0.00 ATOM 76 CA LYS L 183 38.310 53.122 21.318 0.00 0.00 ATOM 77 CA ALA L 184 39.323 50.063 19.270 0.00 0.00 ATOM 78 CA ASP L 185 36.201 48.097 20.212 0.00 0.00 ATOM 79 CA TYR L 186 33.990 51.196 19.905 0.00 0.00 ATOM 80 CA GLU L 187 34.981 52.134 16.340 0.00 0.00 ATOM 81 CA LYS L 188 33.815 48.657 15.296 0.00 0.00 ATOM 82 CA HIS L 189 30.109 48.613 16.217 0.00 0.00 ATOM 83 CA LYS L 190 27.038 50.730 15.450 0.00 0.00 ATOM 84 CA VAL L 191 23.831 49.890 17.345 0.00 0.00 ATOM 85 CA TYR L 192 23.846 50.619 21.094 0.00 0.00 ATOM 86 CA ALA L 193 20.559 50.065 22.947 0.00 0.00 ATOM 87 CA CYS L 194 19.697 49.609 26.642 0.00 0.00 ATOM 88 CA GLU L 195 16.681 47.417 27.503 0.00 0.00 ATOM 89 CA VAL L 196 15.000 48.136 30.865 0.00 0.00 ATOM 90 CA THR L 197 12.561 45.982 32.866 0.00 0.00 ATOM 91 CA HIS L 198 10.410 47.407 35.674 0.00 0.00 ATOM 92 CA GLN L 199 6.967 46.837 37.210 0.00 0.00 ATOM 93 CA GLY L 200 5.830 50.323 36.232 0.00 0.00 ATOM 94 CA LEU L 201 6.656 49.706 32.576 0.00 0.00 ATOM 95 CA SER L 202 4.046 47.809 30.553 0.00 0.00 ATOM 96 CA SER L 203 6.775 46.641 28.157 0.00 0.00 ATOM 97 CA PRO L 204 10.613 46.985 28.032 0.00 0.00 ATOM 98 CA VAL L 205 11.724 50.438 26.873 0.00 0.00 ATOM 99 CA THR L 206 14.555 50.458 24.326 0.00 0.00 ATOM 100 CA LYS L 207 16.842 53.490 23.950 0.00 0.00 ATOM 101 CA SER L 208 19.288 53.101 21.060 0.00 0.00 ATOM 102 CA PHE L 209 21.574 55.363 19.015 0.00 0.00 ATOM 103 CA ASN L 210 23.556 54.840 15.804 0.00 0.00 ATOM 104 CA ARG L 211 27.346 55.269 15.827 0.00 0.00 ATOM 105 CA GLY L 212 28.782 57.224 12.879 0.00 0.00 ATOM 106 CA GLU L 213 27.784 60.800 11.970 0.00 0.00 ATOM 107 CA CYS L 214 29.246 62.985 9.193 0.00 0.00 TER