HEADER IMMUNE SYSTEM 02-AUG-07 2QTJ TITLE Solution structure of human dimeric immunoglobulin A COMPND MOL_ID: 2; COMPND 2 MOLECULE: Ig alpha-1 chain C region; COMPND 3 CHAIN: A, B, C, D; EXPDTA SOLUTION SCATTERING DBREF 2QTJ A 1 475 UNP P01876 IGHA1_HUMAN 1 475 SEQRES 1 A 122 GLN VAL LYS LEU LEU GLU GLN SER GLY ALA GLU VAL LYS SEQRES 2 A 122 LYS PRO GLY ALA SER VAL LYS VAL SER CYS LYS ALA SER SEQRES 3 A 122 GLY TYR SER PHE THR SER TYR GLY LEU HIS TRP VAL ARG SEQRES 4 A 122 GLN ALA PRO GLY GLN ARG LEU GLU TRP MET GLY TRP ILE SEQRES 5 A 122 SER ALA GLY THR GLY ASN THR LYS TYR SER GLN LYS PHE SEQRES 6 A 122 ARG GLY ARG VAL THR PHE THR ARG ASP THR SER ALA THR SEQRES 7 A 122 THR ALA TYR MET GLY LEU SER SER LEU ARG PRO GLU ASP SEQRES 8 A 122 THR ALA VAL TYR TYR CYS ALA ARG ASP PRO TYR GLY GLY SEQRES 9 A 122 GLY LYS SER GLU PHE ASP TYR TRP GLY GLN GLY THR LEU SEQRES 10 A 122 VAL THR VAL SER SER ATOM 1 CA GLN A 1 49.011 47.699 34.963 0.00 0.00 ATOM 2 CA VAL A 2 48.407 51.271 33.695 0.00 0.00 ATOM 3 CA LYS A 3 49.431 49.358 30.589 0.00 0.00 ATOM 4 CA LEU A 4 52.535 47.042 30.948 0.00 0.00 ATOM 5 CA LEU A 5 54.957 48.839 28.591 0.00 0.00 ATOM 6 CA GLU A 6 53.747 52.472 27.975 0.00 0.00 ATOM 7 CA GLN A 7 55.271 55.117 25.711 0.00 0.00 ATOM 8 CA SER A 8 55.516 58.951 25.559 0.00 0.00 ATOM 9 CA GLY A 9 53.100 60.438 22.948 0.00 0.00 ATOM 10 CA ALA A 10 53.834 62.074 19.617 0.00 0.00 ATOM 11 CA GLU A 11 55.791 64.418 18.248 0.00 0.00 ATOM 12 CA VAL A 12 56.673 66.753 15.478 0.00 0.00 ATOM 13 CA LYS A 13 60.342 67.627 15.124 0.00 0.00 ATOM 14 CA LYS A 14 62.025 69.866 12.530 0.00 0.00 ATOM 15 CA PRO A 15 64.529 68.140 10.099 0.00 0.00 ATOM 16 CA GLY A 16 68.005 68.245 11.775 0.00 0.00 ATOM 17 CA ALA A 17 66.593 68.083 15.344 0.00 0.00 ATOM 18 CA SER A 18 66.687 65.159 17.806 0.00 0.00 ATOM 19 CA VAL A 19 63.753 63.247 19.374 0.00 0.00 ATOM 20 CA LYS A 20 63.722 61.349 22.699 0.00 0.00 ATOM 21 CA VAL A 21 61.091 58.600 23.076 0.00 0.00 ATOM 22 CA SER A 22 60.471 56.953 26.500 0.00 0.00 ATOM 23 CA CYS A 23 59.062 53.563 27.469 0.00 0.00 ATOM 24 CA LYS A 24 57.926 53.029 31.115 0.00 0.00 ATOM 25 CA ALA A 25 57.688 49.362 32.275 0.00 0.00 ATOM 26 CA SER A 26 54.991 48.587 34.943 0.00 0.00 ATOM 27 CA GLY A 27 53.923 45.253 36.605 0.00 0.00 ATOM 28 CA TYR A 28 57.054 43.107 35.914 0.00 0.00 ATOM 29 CA SER A 29 60.665 43.259 37.297 0.00 0.00 ATOM 30 CA PHE A 30 62.285 45.872 34.953 0.00 0.00 ATOM 31 CA THR A 31 65.984 44.774 35.380 0.00 0.00 ATOM 32 CA SER A 32 65.274 41.048 34.566 0.00 0.00 ATOM 33 CA TYR A 33 64.553 41.667 30.806 0.00 0.00 ATOM 34 CA GLY A 34 65.939 43.548 27.809 0.00 0.00 ATOM 35 CA LEU A 35 63.910 46.035 25.713 0.00 0.00 ATOM 36 CA HIS A 36 64.022 46.136 21.903 0.00 0.00 ATOM 37 CA TRP A 37 63.271 49.300 19.794 0.00 0.00 ATOM 38 CA VAL A 38 61.473 48.867 16.432 0.00 0.00 ATOM 39 CA ARG A 39 60.006 51.386 13.967 0.00 0.00 ATOM 40 CA GLN A 40 57.374 51.278 11.206 0.00 0.00 ATOM 41 CA ALA A 41 57.476 53.994 8.504 0.00 0.00 ATOM 42 CA PRO A 42 54.114 54.561 6.673 0.00 0.00 ATOM 43 CA GLY A 43 53.241 51.625 4.343 0.00 0.00 ATOM 44 CA GLN A 44 56.489 49.846 5.238 0.00 0.00 ATOM 45 CA ARG A 45 57.656 46.790 7.146 0.00 0.00 ATOM 46 CA LEU A 46 58.854 46.902 10.759 0.00 0.00 ATOM 47 CA GLU A 47 62.564 47.739 11.106 0.00 0.00 ATOM 48 CA TRP A 48 64.617 46.678 14.143 0.00 0.00 ATOM 49 CA MET A 49 66.757 49.607 15.512 0.00 0.00 ATOM 50 CA GLY A 50 68.402 48.324 18.723 0.00 0.00 ATOM 51 CA TRP A 51 68.169 46.680 22.169 0.00 0.00 ATOM 52 CA ILE A 52 69.114 47.623 25.775 0.00 0.00 ATOM 53 CA SER A 53 69.634 45.269 28.771 0.00 0.00 ATOM 54 CA ALA A 54 67.754 46.970 31.716 0.00 0.00 ATOM 55 CA GLY A 55 70.091 45.230 34.252 0.00 0.00 ATOM 56 CA THR A 56 73.575 46.155 32.820 0.00 0.00 ATOM 57 CA GLY A 57 72.694 49.166 30.561 0.00 0.00 ATOM 58 CA ASN A 58 74.471 47.344 27.639 0.00 0.00 ATOM 59 CA THR A 59 73.536 48.225 24.142 0.00 0.00 ATOM 60 CA LYS A 60 73.191 46.636 20.703 0.00 0.00 ATOM 61 CA TYR A 61 72.032 48.423 17.565 0.00 0.00 ATOM 62 CA SER A 62 71.431 48.261 13.819 0.00 0.00 ATOM 63 CA GLN A 63 74.376 49.741 11.859 0.00 0.00 ATOM 64 CA LYS A 64 71.747 51.502 9.644 0.00 0.00 ATOM 65 CA PHE A 65 71.525 53.975 12.647 0.00 0.00 ATOM 66 CA ARG A 66 75.345 54.027 13.301 0.00 0.00 ATOM 67 CA GLY A 67 76.383 57.313 14.941 0.00 0.00 ATOM 68 CA ARG A 68 72.828 58.754 15.466 0.00 0.00 ATOM 69 CA VAL A 69 70.894 56.403 17.857 0.00 0.00 ATOM 70 CA THR A 70 71.383 56.254 21.704 0.00 0.00 ATOM 71 CA PHE A 71 69.705 53.871 24.255 0.00 0.00 ATOM 72 CA THR A 72 69.471 54.729 27.980 0.00 0.00 ATOM 73 CA ARG A 73 67.565 53.252 30.974 0.00 0.00 ATOM 74 CA ASP A 74 66.626 54.966 34.264 0.00 0.00 ATOM 75 CA THR A 75 66.555 51.860 36.468 0.00 0.00 ATOM 76 CA SER A 76 64.917 53.708 39.477 0.00 0.00 ATOM 77 CA ALA A 77 62.043 55.262 37.378 0.00 0.00 ATOM 78 CA THR A 78 61.838 51.937 35.453 0.00 0.00 ATOM 79 CA THR A 79 61.915 53.748 32.076 0.00 0.00 ATOM 80 CA ALA A 80 64.043 53.124 28.964 0.00 0.00 ATOM 81 CA TYR A 81 64.666 55.824 26.306 0.00 0.00 ATOM 82 CA MET A 82 65.825 55.962 22.727 0.00 0.00 ATOM 83 CA GLY A 83 67.433 59.156 21.400 0.00 0.00 ATOM 84 CA LEU A 84 67.427 59.657 17.581 0.00 0.00 ATOM 85 CA SER A 85 69.608 62.548 16.276 0.00 0.00 ATOM 86 CA SER A 86 69.905 64.356 12.893 0.00 0.00 ATOM 87 CA LEU A 87 66.249 63.780 11.979 0.00 0.00 ATOM 88 CA ARG A 88 65.425 63.435 8.272 0.00 0.00 ATOM 89 CA PRO A 89 61.846 63.433 6.768 0.00 0.00 ATOM 90 CA GLU A 90 62.141 59.587 6.281 0.00 0.00 ATOM 91 CA ASP A 91 62.341 59.150 10.113 0.00 0.00 ATOM 92 CA THR A 92 58.538 59.892 10.150 0.00 0.00 ATOM 93 CA ALA A 93 57.390 56.559 11.619 0.00 0.00 ATOM 94 CA VAL A 94 55.769 54.889 14.647 0.00 0.00 ATOM 95 CA TYR A 95 58.484 53.977 17.233 0.00 0.00 ATOM 96 CA TYR A 96 57.713 50.940 19.401 0.00 0.00 ATOM 97 CA CYS A 97 59.568 49.552 22.361 0.00 0.00 ATOM 98 CA ALA A 98 58.990 45.781 22.808 0.00 0.00 ATOM 99 CA ARG A 99 60.122 43.313 25.475 0.00 0.00 ATOM 100 CA ASP A 100 62.866 40.653 25.128 0.00 0.00 ATOM 101 CA PRO A 101 61.400 37.732 27.257 0.00 0.00 ATOM 102 CA TYR A 102 64.913 36.350 28.078 0.00 0.00 ATOM 103 CA GLY A 103 67.308 39.368 28.504 0.00 0.00 ATOM 104 CA GLY A 104 69.846 38.115 25.861 0.00 0.00 ATOM 105 CA GLY A 105 69.226 40.491 22.878 0.00 0.00 ATOM 106 CA LYS A 106 68.126 38.001 20.192 0.00 0.00 ATOM 107 CA SER A 107 64.506 37.002 20.698 0.00 0.00 ATOM 108 CA GLU A 108 60.889 37.226 19.564 0.00 0.00 ATOM 109 CA PHE A 109 59.127 40.186 21.342 0.00 0.00 ATOM 110 CA ASP A 110 56.266 39.148 23.724 0.00 0.00 ATOM 111 CA TYR A 111 54.957 42.603 24.964 0.00 0.00 ATOM 112 CA TRP A 112 54.870 45.727 22.814 0.00 0.00 ATOM 113 CA GLY A 113 54.431 49.358 23.824 0.00 0.00 ATOM 114 CA GLN A 114 51.648 51.271 21.980 0.00 0.00 ATOM 115 CA GLY A 115 53.874 53.317 19.621 0.00 0.00 ATOM 116 CA THR A 116 54.771 57.026 19.391 0.00 0.00 ATOM 117 CA LEU A 117 54.478 58.666 16.009 0.00 0.00 ATOM 118 CA VAL A 118 57.369 61.080 15.379 0.00 0.00 ATOM 119 CA THR A 119 56.685 63.294 12.377 0.00 0.00 ATOM 120 CA VAL A 120 59.697 65.147 10.907 0.00 0.00 ATOM 121 CA SER A 121 58.500 68.456 9.296 0.00 0.00 ATOM 122 CA SER A 122 59.006 72.232 8.688 0.00 0.00 TER