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 D 123 475 UNP P01876 IGHA1_HUMAN 1 353 SEQRES 1 D 122 GLN VAL LYS LEU LEU GLU GLN SER GLY ALA GLU VAL LYS SEQRES 2 D 122 LYS PRO GLY ALA SER VAL LYS VAL SER CYS LYS ALA SER SEQRES 3 D 122 GLY TYR SER PHE THR SER TYR GLY LEU HIS TRP VAL ARG SEQRES 4 D 122 GLN ALA PRO GLY GLN ARG LEU GLU TRP MET GLY TRP ILE SEQRES 5 D 122 SER ALA GLY THR GLY ASN THR LYS TYR SER GLN LYS PHE SEQRES 6 D 122 ARG GLY ARG VAL THR PHE THR ARG ASP THR SER ALA THR SEQRES 7 D 122 THR ALA TYR MET GLY LEU SER SER LEU ARG PRO GLU ASP SEQRES 8 D 122 THR ALA VAL TYR TYR CYS ALA ARG ASP PRO TYR GLY GLY SEQRES 9 D 122 GLY LYS SER GLU PHE ASP TYR TRP GLY GLN GLY THR LEU SEQRES 10 D 122 VAL THR VAL SER SER ATOM 1 CA GLN D 1 -15.327 148.113 43.885 0.00 0.00 ATOM 2 CA VAL D 2 -13.413 151.402 43.384 0.00 0.00 ATOM 3 CA LYS D 3 -10.803 149.025 44.763 0.00 0.00 ATOM 4 CA LEU D 4 -11.878 146.893 47.833 0.00 0.00 ATOM 5 CA LEU D 5 -9.520 148.339 50.479 0.00 0.00 ATOM 6 CA GLU D 6 -8.169 151.780 49.304 0.00 0.00 ATOM 7 CA GLN D 7 -5.663 154.050 51.037 0.00 0.00 ATOM 8 CA SER D 8 -4.887 157.809 51.257 0.00 0.00 ATOM 9 CA GLY D 9 -1.821 158.765 49.125 0.00 0.00 ATOM 10 CA ALA D 10 1.644 159.840 50.200 0.00 0.00 ATOM 11 CA GLU D 11 3.176 161.976 52.270 0.00 0.00 ATOM 12 CA VAL D 12 6.194 163.837 53.424 0.00 0.00 ATOM 13 CA LYS D 13 6.302 164.746 57.100 0.00 0.00 ATOM 14 CA LYS D 14 9.046 166.566 59.032 0.00 0.00 ATOM 15 CA PRO D 15 10.868 164.529 61.805 0.00 0.00 ATOM 16 CA GLY D 16 8.877 165.016 65.077 0.00 0.00 ATOM 17 CA ALA D 17 5.502 165.415 63.285 0.00 0.00 ATOM 18 CA SER D 18 2.582 162.949 63.140 0.00 0.00 ATOM 19 CA VAL D 19 1.032 161.243 60.074 0.00 0.00 ATOM 20 CA LYS D 20 -2.546 159.931 59.699 0.00 0.00 ATOM 21 CA VAL D 21 -3.105 157.209 57.073 0.00 0.00 ATOM 22 CA SER D 22 -6.674 156.143 56.101 0.00 0.00 ATOM 23 CA CYS D 23 -8.051 152.925 54.630 0.00 0.00 ATOM 24 CA LYS D 24 -11.594 152.978 53.109 0.00 0.00 ATOM 25 CA ALA D 25 -13.329 149.553 52.785 0.00 0.00 ATOM 26 CA SER D 26 -15.789 149.158 49.821 0.00 0.00 ATOM 27 CA GLY D 27 -17.872 146.121 48.615 0.00 0.00 ATOM 28 CA TYR D 28 -17.891 143.982 51.824 0.00 0.00 ATOM 29 CA SER D 29 -19.603 144.469 55.262 0.00 0.00 ATOM 30 CA PHE D 30 -17.033 146.698 57.100 0.00 0.00 ATOM 31 CA THR D 31 -18.029 145.795 60.741 0.00 0.00 ATOM 32 CA SER D 32 -17.791 141.966 60.164 0.00 0.00 ATOM 33 CA TYR D 33 -13.925 141.924 59.852 0.00 0.00 ATOM 34 CA GLY D 34 -10.817 143.314 61.536 0.00 0.00 ATOM 35 CA LEU D 35 -8.125 145.353 59.723 0.00 0.00 ATOM 36 CA HIS D 36 -4.386 144.816 60.249 0.00 0.00 ATOM 37 CA TRP D 37 -1.703 147.557 59.699 0.00 0.00 ATOM 38 CA VAL D 38 1.708 146.514 58.283 0.00 0.00 ATOM 39 CA ARG D 39 4.706 148.539 57.067 0.00 0.00 ATOM 40 CA GLN D 40 7.672 147.892 54.755 0.00 0.00 ATOM 41 CA ALA D 41 10.771 150.118 55.123 0.00 0.00 ATOM 42 CA PRO D 42 13.017 150.271 51.974 0.00 0.00 ATOM 43 CA GLY D 43 14.893 146.960 51.392 0.00 0.00 ATOM 44 CA GLN D 44 13.369 145.452 54.542 0.00 0.00 ATOM 45 CA ARG D 45 10.856 142.796 55.526 0.00 0.00 ATOM 46 CA LEU D 46 7.209 143.548 56.322 0.00 0.00 ATOM 47 CA GLU D 47 6.618 144.540 59.961 0.00 0.00 ATOM 48 CA TRP D 48 3.245 144.063 61.683 0.00 0.00 ATOM 49 CA MET D 49 2.176 147.243 63.627 0.00 0.00 ATOM 50 CA GLY D 50 -1.363 146.566 64.926 0.00 0.00 ATOM 51 CA TRP D 51 -4.994 145.518 64.336 0.00 0.00 ATOM 52 CA ILE D 52 -8.465 147.080 64.871 0.00 0.00 ATOM 53 CA SER D 53 -11.857 145.280 65.086 0.00 0.00 ATOM 54 CA ALA D 54 -14.254 147.395 62.878 0.00 0.00 ATOM 55 CA GLY D 55 -17.281 146.175 64.941 0.00 0.00 ATOM 56 CA THR D 56 -16.090 146.947 68.550 0.00 0.00 ATOM 57 CA GLY D 57 -13.271 149.509 67.889 0.00 0.00 ATOM 58 CA ASN D 58 -10.907 147.274 69.994 0.00 0.00 ATOM 59 CA THR D 59 -7.231 147.527 69.438 0.00 0.00 ATOM 60 CA LYS D 60 -4.096 145.375 69.488 0.00 0.00 ATOM 61 CA TYR D 61 -0.595 146.574 68.660 0.00 0.00 ATOM 62 CA SER D 62 3.110 145.767 68.473 0.00 0.00 ATOM 63 CA GLN D 63 4.971 146.982 71.599 0.00 0.00 ATOM 64 CA LYS D 64 7.719 148.269 69.209 0.00 0.00 ATOM 65 CA PHE D 65 5.221 151.204 68.633 0.00 0.00 ATOM 66 CA ARG D 66 4.185 151.477 72.357 0.00 0.00 ATOM 67 CA GLY D 67 3.028 155.020 73.175 0.00 0.00 ATOM 68 CA ARG D 68 3.134 156.425 69.569 0.00 0.00 ATOM 69 CA VAL D 69 0.598 154.453 67.411 0.00 0.00 ATOM 70 CA THR D 70 -3.249 154.967 67.479 0.00 0.00 ATOM 71 CA PHE D 71 -5.976 152.998 65.557 0.00 0.00 ATOM 72 CA THR D 72 -9.455 154.463 64.909 0.00 0.00 ATOM 73 CA ARG D 73 -12.437 153.455 62.703 0.00 0.00 ATOM 74 CA ASP D 74 -15.270 155.669 61.391 0.00 0.00 ATOM 75 CA THR D 75 -17.950 152.977 61.114 0.00 0.00 ATOM 76 CA SER D 76 -20.410 155.255 59.137 0.00 0.00 ATOM 77 CA ALA D 77 -17.785 156.350 56.493 0.00 0.00 ATOM 78 CA THR D 78 -16.443 152.745 56.535 0.00 0.00 ATOM 79 CA THR D 79 -12.835 153.964 56.961 0.00 0.00 ATOM 80 CA ALA D 80 -10.118 152.888 59.423 0.00 0.00 ATOM 81 CA TYR D 81 -7.120 155.121 60.303 0.00 0.00 ATOM 82 CA MET D 82 -3.712 154.688 61.845 0.00 0.00 ATOM 83 CA GLY D 83 -2.039 157.661 63.553 0.00 0.00 ATOM 84 CA LEU D 84 1.788 157.513 63.960 0.00 0.00 ATOM 85 CA SER D 85 3.327 160.205 66.239 0.00 0.00 ATOM 86 CA SER D 86 6.918 161.427 66.884 0.00 0.00 ATOM 87 CA LEU D 87 8.103 160.599 63.357 0.00 0.00 ATOM 88 CA ARG D 88 11.763 159.612 62.946 0.00 0.00 ATOM 89 CA PRO D 89 13.616 159.253 59.553 0.00 0.00 ATOM 90 CA GLU D 90 13.407 155.391 59.940 0.00 0.00 ATOM 91 CA ASP D 91 9.556 155.610 59.726 0.00 0.00 ATOM 92 CA THR D 92 10.048 156.237 55.933 0.00 0.00 ATOM 93 CA ALA D 93 8.165 153.165 54.668 0.00 0.00 ATOM 94 CA VAL D 94 5.085 151.980 52.744 0.00 0.00 ATOM 95 CA TYR D 95 2.109 151.597 55.170 0.00 0.00 ATOM 96 CA TYR D 96 -0.449 148.945 54.199 0.00 0.00 ATOM 97 CA CYS D 97 -3.782 148.129 55.735 0.00 0.00 ATOM 98 CA ALA D 98 -4.801 144.472 55.152 0.00 0.00 ATOM 99 CA ARG D 99 -7.953 142.521 56.012 0.00 0.00 ATOM 100 CA ASP D 100 -8.357 139.921 58.807 0.00 0.00 ATOM 101 CA PRO D 101 -10.784 137.358 57.148 0.00 0.00 ATOM 102 CA TYR D 102 -12.196 136.236 60.566 0.00 0.00 ATOM 103 CA GLY D 103 -12.353 139.352 62.867 0.00 0.00 ATOM 104 CA GLY D 104 -10.246 137.747 65.691 0.00 0.00 ATOM 105 CA GLY D 105 -6.853 139.569 65.375 0.00 0.00 ATOM 106 CA LYS D 106 -4.529 136.632 64.602 0.00 0.00 ATOM 107 CA SER D 107 -4.811 135.627 60.959 0.00 0.00 ATOM 108 CA GLU D 108 -3.280 135.552 57.486 0.00 0.00 ATOM 109 CA PHE D 109 -4.331 138.716 55.508 0.00 0.00 ATOM 110 CA ASP D 110 -6.538 138.010 52.416 0.00 0.00 ATOM 111 CA TYR D 111 -7.028 141.585 50.943 0.00 0.00 ATOM 112 CA TRP D 112 -4.379 144.300 51.057 0.00 0.00 ATOM 113 CA GLY D 113 -4.704 148.034 50.471 0.00 0.00 ATOM 114 CA GLN D 114 -2.278 149.528 47.886 0.00 0.00 ATOM 115 CA GLY D 115 0.146 151.213 50.333 0.00 0.00 ATOM 116 CA THR D 116 0.907 154.854 51.211 0.00 0.00 ATOM 117 CA LEU D 117 4.531 155.894 51.271 0.00 0.00 ATOM 118 CA VAL D 118 5.253 158.251 54.187 0.00 0.00 ATOM 119 CA THR D 119 8.643 159.909 53.813 0.00 0.00 ATOM 120 CA VAL D 120 10.080 161.575 56.946 0.00 0.00 ATOM 121 CA SER D 121 12.347 164.530 55.896 0.00 0.00 ATOM 122 CA SER D 122 13.532 168.163 56.426 0.00 0.00 TER