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 GLU LEU VAL MET THR GLN SER PRO SER SER LEU SER ALA SEQRES 2 L 107 SER VAL GLY ASP ARG VAL ASN ILE ALA CYS ARG ALA SER SEQRES 3 L 107 GLN GLY ILE SER SER ALA LEU ALA TRP TYR GLN GLN LYS SEQRES 4 L 107 PRO GLY LYS ALA PRO ARG LEU LEU ILE TYR ASP ALA SER SEQRES 5 L 107 ASN LEU GLU SER GLY VAL PRO SER ARG PHE SER GLY SER SEQRES 6 L 107 GLY SER GLY THR ASP PHE THR LEU THR ILE SER SER LEU SEQRES 7 L 107 GLN PRO GLU ASP PHE ALA ILE TYR TYR CYS GLN GLN PHE SEQRES 8 L 107 ASN SER TYR PRO LEU THR PHE GLY GLY GLY THR LYS VAL SEQRES 9 L 107 GLU ILE LYS ATOM 1 CA GLU L 1 32.427 47.639 76.683 0.00 0.00 ATOM 2 CA LEU L 2 28.634 47.768 76.993 0.00 0.00 ATOM 3 CA VAL L 3 26.885 46.224 73.975 0.00 0.00 ATOM 4 CA MET L 4 23.916 47.997 72.368 0.00 0.00 ATOM 5 CA THR L 5 21.680 45.894 70.103 0.00 0.00 ATOM 6 CA GLN L 6 18.947 47.495 67.972 0.00 0.00 ATOM 7 CA SER L 7 16.171 45.771 65.996 0.00 0.00 ATOM 8 CA PRO L 8 15.039 45.248 63.334 0.00 0.00 ATOM 9 CA SER L 9 17.856 45.611 60.793 0.00 0.00 ATOM 10 CA SER L 10 15.540 47.196 58.212 0.00 0.00 ATOM 11 CA LEU L 11 12.071 48.789 58.239 0.00 0.00 ATOM 12 CA SER L 12 9.428 49.022 55.514 0.00 0.00 ATOM 13 CA ALA L 13 6.319 51.194 55.949 0.00 0.00 ATOM 14 CA SER L 14 4.087 53.594 54.007 0.00 0.00 ATOM 15 CA VAL L 15 3.467 57.251 54.903 0.00 0.00 ATOM 16 CA GLY L 16 1.368 57.419 58.062 0.00 0.00 ATOM 17 CA ASP L 17 2.241 54.168 59.846 0.00 0.00 ATOM 18 CA ARG L 18 3.683 54.258 63.370 0.00 0.00 ATOM 19 CA VAL L 19 7.092 52.535 63.469 0.00 0.00 ATOM 20 CA ASN L 20 8.784 51.171 66.607 0.00 0.00 ATOM 21 CA ILE L 21 12.587 51.056 67.002 0.00 0.00 ATOM 22 CA ALA L 22 14.115 49.204 69.976 0.00 0.00 ATOM 23 CA CYS L 23 17.496 49.722 71.686 0.00 0.00 ATOM 24 CA ARG L 24 18.435 47.200 74.391 0.00 0.00 ATOM 25 CA ALA L 25 21.617 47.187 76.498 0.00 0.00 ATOM 26 CA SER L 26 23.800 44.574 78.213 0.00 0.00 ATOM 27 CA GLN L 27 23.113 46.065 81.657 0.00 0.00 ATOM 28 CA GLY L 28 21.085 48.874 83.237 0.00 0.00 ATOM 29 CA ILE L 29 22.167 52.395 82.282 0.00 0.00 ATOM 30 CA SER L 30 19.228 54.266 83.853 0.00 0.00 ATOM 31 CA SER L 31 18.048 57.259 81.779 0.00 0.00 ATOM 32 CA ALA L 32 21.272 57.645 79.754 0.00 0.00 ATOM 33 CA LEU L 33 20.470 57.203 76.036 0.00 0.00 ATOM 34 CA ALA L 34 20.450 59.418 72.928 0.00 0.00 ATOM 35 CA TRP L 35 18.808 58.929 69.519 0.00 0.00 ATOM 36 CA TYR L 36 20.230 60.179 66.215 0.00 0.00 ATOM 37 CA GLN L 37 19.251 60.823 62.592 0.00 0.00 ATOM 38 CA GLN L 38 21.817 60.285 59.846 0.00 0.00 ATOM 39 CA LYS L 39 20.683 61.228 56.344 0.00 0.00 ATOM 40 CA PRO L 40 22.879 59.223 53.909 0.00 0.00 ATOM 41 CA GLY L 41 25.952 61.309 53.134 0.00 0.00 ATOM 42 CA LYS L 42 25.553 63.633 56.127 0.00 0.00 ATOM 43 CA ALA L 43 26.533 64.027 59.778 0.00 0.00 ATOM 44 CA PRO L 44 24.235 62.644 62.535 0.00 0.00 ATOM 45 CA ARG L 45 21.567 64.846 64.121 0.00 0.00 ATOM 46 CA LEU L 46 20.497 64.732 67.770 0.00 0.00 ATOM 47 CA LEU L 47 16.807 63.922 68.207 0.00 0.00 ATOM 48 CA ILE L 48 16.248 62.852 71.820 0.00 0.00 ATOM 49 CA TYR L 49 18.365 63.136 74.973 0.00 0.00 ATOM 50 CA ASP L 50 17.951 61.895 78.568 0.00 0.00 ATOM 51 CA ALA L 51 15.562 59.215 77.238 0.00 0.00 ATOM 52 CA SER L 52 12.424 61.270 76.496 0.00 0.00 ATOM 53 CA ASN L 53 13.342 64.970 76.169 0.00 0.00 ATOM 54 CA LEU L 54 13.221 66.436 72.648 0.00 0.00 ATOM 55 CA GLU L 55 15.642 68.996 71.195 0.00 0.00 ATOM 56 CA SER L 56 14.521 72.471 70.074 0.00 0.00 ATOM 57 CA GLY L 57 13.580 72.210 66.409 0.00 0.00 ATOM 58 CA VAL L 58 12.923 68.472 66.208 0.00 0.00 ATOM 59 CA PRO L 59 9.307 67.762 65.100 0.00 0.00 ATOM 60 CA SER L 60 6.594 67.045 67.671 0.00 0.00 ATOM 61 CA ARG L 61 5.983 63.598 66.146 0.00 0.00 ATOM 62 CA PHE L 62 9.265 62.148 67.454 0.00 0.00 ATOM 63 CA SER L 63 9.393 60.702 70.995 0.00 0.00 ATOM 64 CA GLY L 64 10.084 57.627 73.134 0.00 0.00 ATOM 65 CA SER L 65 10.625 56.190 76.624 0.00 0.00 ATOM 66 CA GLY L 66 12.156 53.315 78.602 0.00 0.00 ATOM 67 CA SER L 67 13.953 52.879 81.939 0.00 0.00 ATOM 68 CA GLY L 68 17.034 50.708 82.402 0.00 0.00 ATOM 69 CA THR L 69 17.280 47.986 79.762 0.00 0.00 ATOM 70 CA ASP L 70 14.431 48.219 77.226 0.00 0.00 ATOM 71 CA PHE L 71 14.196 51.407 75.121 0.00 0.00 ATOM 72 CA THR L 72 12.021 52.506 72.178 0.00 0.00 ATOM 73 CA LEU L 73 11.870 55.205 69.469 0.00 0.00 ATOM 74 CA THR L 74 8.428 56.104 68.099 0.00 0.00 ATOM 75 CA ILE L 75 7.080 58.123 65.131 0.00 0.00 ATOM 76 CA SER L 76 3.304 58.750 65.071 0.00 0.00 ATOM 77 CA SER L 77 3.178 59.977 61.448 0.00 0.00 ATOM 78 CA LEU L 78 5.832 58.726 59.026 0.00 0.00 ATOM 79 CA GLN L 79 6.755 61.269 56.342 0.00 0.00 ATOM 80 CA PRO L 80 9.029 60.955 53.269 0.00 0.00 ATOM 81 CA GLU L 81 11.596 63.273 54.871 0.00 0.00 ATOM 82 CA ASP L 82 12.377 60.664 57.559 0.00 0.00 ATOM 83 CA PHE L 83 14.711 58.569 55.368 0.00 0.00 ATOM 84 CA ALA L 84 17.737 58.059 57.634 0.00 0.00 ATOM 85 CA ILE L 85 19.675 55.434 59.590 0.00 0.00 ATOM 86 CA TYR L 86 18.923 55.946 63.292 0.00 0.00 ATOM 87 CA TYR L 87 21.340 55.173 66.142 0.00 0.00 ATOM 88 CA CYS L 88 21.286 55.012 69.956 0.00 0.00 ATOM 89 CA GLN L 89 24.338 55.433 72.187 0.00 0.00 ATOM 90 CA GLN L 90 24.789 55.366 75.970 0.00 0.00 ATOM 91 CA PHE L 91 26.549 57.730 78.378 0.00 0.00 ATOM 92 CA ASN L 92 26.862 56.124 81.822 0.00 0.00 ATOM 93 CA SER L 93 30.386 54.677 81.562 0.00 0.00 ATOM 94 CA TYR L 94 33.363 54.413 79.192 0.00 0.00 ATOM 95 CA PRO L 95 33.818 53.915 76.370 0.00 0.00 ATOM 96 CA LEU L 96 30.654 55.351 74.812 0.00 0.00 ATOM 97 CA THR L 97 29.110 52.875 72.355 0.00 0.00 ATOM 98 CA PHE L 98 26.617 53.154 69.472 0.00 0.00 ATOM 99 CA GLY L 99 23.789 50.984 68.159 0.00 0.00 ATOM 100 CA GLY L 100 23.805 48.812 65.050 0.00 0.00 ATOM 101 CA GLY L 101 21.617 51.201 63.075 0.00 0.00 ATOM 102 CA THR L 102 18.031 50.798 61.886 0.00 0.00 ATOM 103 CA LYS L 103 17.448 51.993 58.314 0.00 0.00 ATOM 104 CA VAL L 104 13.980 53.309 57.436 0.00 0.00 ATOM 105 CA GLU L 105 12.807 52.694 53.865 0.00 0.00 ATOM 106 CA ILE L 106 9.641 54.502 52.723 0.00 0.00 ATOM 107 CA LYS L 107 6.764 52.825 50.853 0.00 0.00 TER