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 A 123 475 UNP P01876 IGHA1_HUMAN 1 353 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 19.519 -80.750 20.759 0.00 0.00 ATOM 2 CA VAL A 2 21.809 -82.566 23.247 0.00 0.00 ATOM 3 CA LYS A 3 24.183 -80.429 21.209 0.00 0.00 ATOM 4 CA LEU A 4 23.679 -80.508 17.353 0.00 0.00 ATOM 5 CA LEU A 5 26.962 -82.175 16.307 0.00 0.00 ATOM 6 CA GLU A 6 28.554 -83.978 19.350 0.00 0.00 ATOM 7 CA GLN A 7 31.866 -85.834 19.528 0.00 0.00 ATOM 8 CA SER A 8 33.404 -88.750 21.507 0.00 0.00 ATOM 9 CA GLY A 9 35.814 -87.507 24.248 0.00 0.00 ATOM 10 CA ALA A 10 39.582 -87.760 24.463 0.00 0.00 ATOM 11 CA GLU A 11 42.060 -89.986 24.145 0.00 0.00 ATOM 12 CA VAL A 12 45.592 -91.065 24.656 0.00 0.00 ATOM 13 CA LYS A 13 46.978 -93.524 22.130 0.00 0.00 ATOM 14 CA LYS A 14 50.481 -95.029 21.935 0.00 0.00 ATOM 15 CA PRO A 15 52.609 -94.094 18.812 0.00 0.00 ATOM 16 CA GLY A 16 51.832 -96.704 16.076 0.00 0.00 ATOM 17 CA ALA A 17 48.225 -97.281 17.266 0.00 0.00 ATOM 18 CA SER A 18 44.967 -96.160 15.607 0.00 0.00 ATOM 19 CA VAL A 19 42.259 -93.814 16.980 0.00 0.00 ATOM 20 CA LYS A 20 38.548 -93.739 16.038 0.00 0.00 ATOM 21 CA VAL A 21 36.695 -90.450 16.644 0.00 0.00 ATOM 22 CA SER A 22 32.862 -90.287 16.333 0.00 0.00 ATOM 23 CA CYS A 23 30.494 -87.413 15.591 0.00 0.00 ATOM 24 CA LYS A 24 26.743 -87.892 16.345 0.00 0.00 ATOM 25 CA ALA A 25 24.345 -85.514 14.490 0.00 0.00 ATOM 26 CA SER A 26 21.080 -84.586 16.355 0.00 0.00 ATOM 27 CA GLY A 27 18.170 -82.216 15.389 0.00 0.00 ATOM 28 CA TYR A 28 18.691 -82.009 11.571 0.00 0.00 ATOM 29 CA SER A 29 18.225 -84.607 8.741 0.00 0.00 ATOM 30 CA PHE A 30 21.618 -86.458 8.820 0.00 0.00 ATOM 31 CA THR A 31 21.603 -87.786 5.172 0.00 0.00 ATOM 32 CA SER A 32 20.890 -84.310 3.603 0.00 0.00 ATOM 33 CA TYR A 33 24.392 -82.859 4.418 0.00 0.00 ATOM 34 CA GLY A 34 28.076 -83.777 4.249 0.00 0.00 ATOM 35 CA LEU A 35 30.447 -83.691 7.260 0.00 0.00 ATOM 36 CA HIS A 36 33.985 -82.279 7.094 0.00 0.00 ATOM 37 CA TRP A 37 36.869 -83.372 9.441 0.00 0.00 ATOM 38 CA VAL A 38 39.417 -80.727 10.555 0.00 0.00 ATOM 39 CA ARG A 39 42.252 -80.815 13.110 0.00 0.00 ATOM 40 CA GLN A 40 44.193 -78.212 15.114 0.00 0.00 ATOM 41 CA ALA A 41 47.637 -79.185 16.485 0.00 0.00 ATOM 42 CA PRO A 42 48.816 -77.072 19.505 0.00 0.00 ATOM 43 CA GLY A 43 49.731 -73.481 18.468 0.00 0.00 ATOM 44 CA GLN A 44 48.957 -74.253 14.819 0.00 0.00 ATOM 45 CA ARG A 45 46.380 -73.380 12.185 0.00 0.00 ATOM 46 CA LEU A 46 43.367 -75.569 11.389 0.00 0.00 ATOM 47 CA GLU A 47 44.108 -78.307 8.833 0.00 0.00 ATOM 48 CA TRP A 48 41.384 -79.846 6.647 0.00 0.00 ATOM 49 CA MET A 49 41.605 -83.717 6.607 0.00 0.00 ATOM 50 CA GLY A 50 38.560 -84.944 4.636 0.00 0.00 ATOM 51 CA TRP A 51 34.787 -84.999 4.009 0.00 0.00 ATOM 52 CA ILE A 52 32.021 -87.667 3.895 0.00 0.00 ATOM 53 CA SER A 53 28.564 -87.413 2.229 0.00 0.00 ATOM 54 CA ALA A 54 26.086 -88.871 4.844 0.00 0.00 ATOM 55 CA GLY A 55 23.639 -89.854 2.021 0.00 0.00 ATOM 56 CA THR A 56 25.990 -91.814 -0.361 0.00 0.00 ATOM 57 CA GLY A 57 28.930 -92.663 2.000 0.00 0.00 ATOM 58 CA ASN A 58 31.324 -91.070 -0.598 0.00 0.00 ATOM 59 CA THR A 59 34.634 -89.806 0.551 0.00 0.00 ATOM 60 CA LYS A 60 37.144 -87.045 -0.190 0.00 0.00 ATOM 61 CA TYR A 61 40.400 -86.481 1.672 0.00 0.00 ATOM 62 CA SER A 62 43.640 -84.519 1.944 0.00 0.00 ATOM 63 CA GLN A 63 46.557 -86.390 0.302 0.00 0.00 ATOM 64 CA LYS A 64 48.658 -85.398 3.388 0.00 0.00 ATOM 65 CA PHE A 65 46.740 -88.336 5.083 0.00 0.00 ATOM 66 CA ARG A 66 46.947 -90.674 1.999 0.00 0.00 ATOM 67 CA GLY A 67 46.820 -94.333 3.076 0.00 0.00 ATOM 68 CA ARG A 68 46.115 -93.723 6.834 0.00 0.00 ATOM 69 CA VAL A 69 42.706 -91.919 7.164 0.00 0.00 ATOM 70 CA THR A 70 39.242 -93.631 6.811 0.00 0.00 ATOM 71 CA PHE A 71 35.729 -92.004 6.918 0.00 0.00 ATOM 72 CA THR A 72 32.581 -94.030 7.728 0.00 0.00 ATOM 73 CA ARG A 73 28.935 -93.134 8.554 0.00 0.00 ATOM 74 CA ASP A 74 26.340 -95.243 10.415 0.00 0.00 ATOM 75 CA THR A 75 23.220 -93.794 8.779 0.00 0.00 ATOM 76 CA SER A 76 20.786 -95.516 11.281 0.00 0.00 ATOM 77 CA ALA A 77 22.657 -94.287 14.453 0.00 0.00 ATOM 78 CA THR A 78 23.203 -90.927 12.660 0.00 0.00 ATOM 79 CA THR A 79 26.940 -90.941 13.513 0.00 0.00 ATOM 80 CA ALA A 80 30.000 -90.347 11.303 0.00 0.00 ATOM 81 CA TYR A 81 33.505 -91.604 12.239 0.00 0.00 ATOM 82 CA MET A 82 37.061 -90.870 11.242 0.00 0.00 ATOM 83 CA GLY A 83 39.727 -93.559 11.697 0.00 0.00 ATOM 84 CA LEU A 84 43.389 -92.377 11.856 0.00 0.00 ATOM 85 CA SER A 85 46.047 -95.155 11.668 0.00 0.00 ATOM 86 CA SER A 86 49.834 -95.282 12.338 0.00 0.00 ATOM 87 CA LEU A 87 49.713 -92.536 14.980 0.00 0.00 ATOM 88 CA ARG A 88 52.807 -90.335 15.332 0.00 0.00 ATOM 89 CA PRO A 89 53.443 -87.817 18.217 0.00 0.00 ATOM 90 CA GLU A 90 52.595 -84.920 15.766 0.00 0.00 ATOM 91 CA ASP A 91 48.983 -86.258 15.485 0.00 0.00 ATOM 92 CA THR A 92 48.428 -84.799 19.031 0.00 0.00 ATOM 93 CA ALA A 93 45.677 -82.310 18.125 0.00 0.00 ATOM 94 CA VAL A 94 41.991 -81.436 18.608 0.00 0.00 ATOM 95 CA TYR A 95 39.868 -83.255 15.949 0.00 0.00 ATOM 96 CA TYR A 96 36.661 -81.470 14.925 0.00 0.00 ATOM 97 CA CYS A 97 33.851 -82.629 12.713 0.00 0.00 ATOM 98 CA ALA A 98 31.998 -79.703 11.054 0.00 0.00 ATOM 99 CA ARG A 99 28.927 -79.556 8.810 0.00 0.00 ATOM 100 CA ASP A 100 28.873 -78.901 5.030 0.00 0.00 ATOM 101 CA PRO A 101 25.600 -76.816 4.642 0.00 0.00 ATOM 102 CA TYR A 102 25.087 -77.994 0.998 0.00 0.00 ATOM 103 CA GLY A 103 26.253 -81.684 0.767 0.00 0.00 ATOM 104 CA GLY A 104 28.748 -81.032 -2.122 0.00 0.00 ATOM 105 CA GLY A 105 32.180 -81.254 -0.362 0.00 0.00 ATOM 106 CA LYS A 106 33.530 -77.728 -0.970 0.00 0.00 ATOM 107 CA SER A 107 31.972 -75.264 1.450 0.00 0.00 ATOM 108 CA GLU A 108 32.341 -73.044 4.508 0.00 0.00 ATOM 109 CA PHE A 109 31.396 -75.026 7.702 0.00 0.00 ATOM 110 CA ASP A 110 28.267 -73.699 9.542 0.00 0.00 ATOM 111 CA TYR A 111 28.080 -76.071 12.628 0.00 0.00 ATOM 112 CA TRP A 112 31.125 -77.471 14.406 0.00 0.00 ATOM 113 CA GLY A 113 31.390 -80.344 16.871 0.00 0.00 ATOM 114 CA GLN A 114 33.174 -79.533 20.182 0.00 0.00 ATOM 115 CA GLY A 115 36.506 -81.280 19.439 0.00 0.00 ATOM 116 CA THR A 116 38.205 -84.418 20.809 0.00 0.00 ATOM 117 CA LEU A 117 41.810 -84.106 21.868 0.00 0.00 ATOM 118 CA VAL A 118 43.830 -87.183 20.848 0.00 0.00 ATOM 119 CA THR A 119 47.209 -87.243 22.568 0.00 0.00 ATOM 120 CA VAL A 120 49.824 -89.626 21.101 0.00 0.00 ATOM 121 CA SER A 121 52.213 -90.792 23.914 0.00 0.00 ATOM 122 CA SER A 122 54.200 -93.618 25.629 0.00 0.00 TER