HEADER HYDROLASE/HYDROLASE INHIBITOR 31-DEC-69 3QTL TITLE Structural Basis for Dual-inhibition Mechanism of a Non-classical TITLE 2 Kazal-type Serine Protease Inhibitor from Horseshoe Crab in Complex TITLE 3 with Subtilisin COMPND MOL_ID: 2; COMPND 2 MOLECULE: Kazal-type serine protease inhibitor SPI-1; COMPND 3 CHAIN: D; COMPND 4 FRAGMENT: UNP RESIDUES ; COMPND 5 ENGINEERED: YES; EXPDTA X-RAY DIFFRACTION REMARK 2 RESOLUTION. 2.60 ANGSTORMS DBREF 3QTL D 0 74 UNP A1X1V8 A1X1V8_CARR 24 99 SEQRES 1 D 34 GLU LEU CYS PRO SER VAL CYS THR GLU GLU TYR ASP PRO SEQRES 2 D 34 VAL CYS VAL GLU GLY LYS ILE TYR GLY ASN ARG CYS MET SEQRES 3 D 34 GLN SER HIS PHE CYS GLY LYS VAL ATOM 1 N GLU D 41 25.775 2.049 18.369 1.00 54.43 ATOM 2 CA GLU D 41 25.072 2.521 19.556 1.00 59.11 ATOM 3 C GLU D 41 25.822 3.727 20.088 1.00 56.24 ATOM 4 O GLU D 41 25.247 4.800 20.280 1.00 47.28 ATOM 5 CB GLU D 41 25.018 1.439 20.634 1.00 51.40 ATOM 6 CG GLU D 41 23.661 0.784 20.794 1.00 54.17 ATOM 7 CD GLU D 41 23.541 0.034 22.102 1.00 63.41 ATOM 8 OE1 GLU D 41 23.707 0.672 23.163 1.00 59.88 ATOM 9 OE2 GLU D 41 23.283 -1.188 22.070 1.00 62.66 ATOM 10 N LEU D 42 27.116 3.536 20.329 1.00 55.15 ATOM 11 CA LEU D 42 28.000 4.644 20.649 1.00 53.98 ATOM 12 C LEU D 42 28.193 5.450 19.372 1.00 52.40 ATOM 13 O LEU D 42 28.602 6.610 19.407 1.00 62.17 ATOM 14 CB LEU D 42 29.339 4.133 21.180 1.00 51.66 ATOM 15 N CYS D 43 27.879 4.819 18.243 1.00 54.79 ATOM 16 CA CYS D 43 27.925 5.475 16.940 1.00 60.35 ATOM 17 C CYS D 43 26.820 4.946 16.022 1.00 60.14 ATOM 18 O CYS D 43 27.093 4.215 15.072 1.00 60.28 ATOM 19 CB CYS D 43 29.295 5.270 16.289 1.00 63.42 ATOM 20 SG CYS D 43 29.476 6.032 14.659 1.00 64.89 ATOM 21 N PRO D 44 25.562 5.317 16.306 1.00 62.16 ATOM 22 CA PRO D 44 24.424 4.792 15.547 1.00 64.12 ATOM 23 C PRO D 44 24.077 5.622 14.309 1.00 62.49 ATOM 24 O PRO D 44 24.172 6.850 14.324 1.00 54.87 ATOM 25 CB PRO D 44 23.284 4.871 16.558 1.00 49.45 ATOM 26 CG PRO D 44 23.621 6.078 17.377 1.00 58.89 ATOM 27 CD PRO D 44 25.128 6.169 17.428 1.00 56.53 ATOM 28 N SER D 45 23.678 4.936 13.243 1.00 63.50 ATOM 29 CA SER D 45 23.177 5.592 12.042 1.00 63.65 ATOM 30 C SER D 45 21.760 5.097 11.757 1.00 70.71 ATOM 31 O SER D 45 21.545 4.310 10.836 1.00 83.43 ATOM 32 N VAL D 46 20.801 5.552 12.560 1.00 66.76 ATOM 33 CA VAL D 46 19.410 5.120 12.429 1.00 66.04 ATOM 34 C VAL D 46 18.494 5.826 13.429 1.00 69.05 ATOM 35 O VAL D 46 18.008 6.928 13.163 1.00 70.15 ATOM 36 CB VAL D 46 19.267 3.599 12.622 1.00 64.93 ATOM 37 N CYS D 47 18.260 5.179 14.569 1.00 57.52 ATOM 38 CA CYS D 47 17.399 5.716 15.628 1.00 58.08 ATOM 39 C CYS D 47 15.906 5.578 15.334 1.00 59.45 ATOM 40 O CYS D 47 15.461 5.769 14.202 1.00 55.68 ATOM 41 CB CYS D 47 17.723 7.186 15.917 1.00 54.61 ATOM 42 SG CYS D 47 19.408 7.497 16.476 1.00 65.32 ATOM 43 N THR D 48 15.137 5.247 16.368 1.00 56.33 ATOM 44 CA THR D 48 13.688 5.319 16.287 1.00 46.02 ATOM 45 C THR D 48 13.315 6.789 16.241 1.00 48.93 ATOM 46 O THR D 48 14.134 7.652 16.560 1.00 46.28 ATOM 47 CB THR D 48 13.006 4.679 17.513 1.00 49.79 ATOM 48 OG1 THR D 48 13.228 5.494 18.674 1.00 46.04 ATOM 49 CG2 THR D 48 13.541 3.276 17.761 1.00 35.78 ATOM 50 N GLU D 49 12.083 7.081 15.844 1.00 54.09 ATOM 51 CA GLU D 49 11.621 8.462 15.805 1.00 53.47 ATOM 52 C GLU D 49 10.667 8.759 16.960 1.00 50.18 ATOM 53 O GLU D 49 9.678 9.474 16.796 1.00 53.27 ATOM 54 CB GLU D 49 10.970 8.781 14.458 1.00 60.89 ATOM 55 CG GLU D 49 11.946 8.799 13.292 1.00 53.33 ATOM 56 CD GLU D 49 12.970 9.909 13.409 1.00 61.00 ATOM 57 OE1 GLU D 49 12.729 10.860 14.184 1.00 61.68 ATOM 58 OE2 GLU D 49 14.013 9.833 12.723 1.00 63.20 ATOM 59 N GLU D 50 10.966 8.188 18.123 1.00 52.77 ATOM 60 CA GLU D 50 10.257 8.522 19.350 1.00 49.02 ATOM 61 C GLU D 50 10.797 9.832 19.900 1.00 43.57 ATOM 62 O GLU D 50 12.006 10.049 19.918 1.00 52.15 ATOM 63 CB GLU D 50 10.434 7.421 20.394 1.00 40.35 ATOM 64 CG GLU D 50 10.073 7.861 21.804 1.00 45.22 ATOM 65 CD GLU D 50 10.382 6.807 22.851 1.00 50.47 ATOM 66 OE1 GLU D 50 11.071 5.814 22.521 1.00 47.04 ATOM 67 OE2 GLU D 50 9.934 6.976 24.007 1.00 46.31 ATOM 68 N TYR D 51 9.906 10.710 20.344 1.00 43.17 ATOM 69 CA TYR D 51 10.343 11.979 20.905 1.00 47.32 ATOM 70 C TYR D 51 10.518 11.882 22.416 1.00 52.25 ATOM 71 O TYR D 51 9.547 11.819 23.168 1.00 51.73 ATOM 72 CB TYR D 51 9.385 13.110 20.541 1.00 45.08 ATOM 73 CG TYR D 51 9.857 14.458 21.024 1.00 43.24 ATOM 74 CD1 TYR D 51 11.019 15.029 20.517 1.00 43.54 ATOM 75 CD2 TYR D 51 9.146 15.162 21.986 1.00 47.01 ATOM 76 CE1 TYR D 51 11.460 16.267 20.958 1.00 44.30 ATOM 77 CE2 TYR D 51 9.577 16.400 22.433 1.00 49.78 ATOM 78 CZ TYR D 51 10.733 16.947 21.916 1.00 49.03 ATOM 79 OH TYR D 51 11.161 18.175 22.361 1.00 43.08 ATOM 80 N ASP D 52 11.775 11.867 22.843 1.00 46.57 ATOM 81 CA ASP D 52 12.135 11.754 24.245 1.00 46.55 ATOM 82 C ASP D 52 13.429 12.535 24.412 1.00 41.69 ATOM 83 O ASP D 52 14.501 11.951 24.556 1.00 47.28 ATOM 84 CB ASP D 52 12.341 10.283 24.609 1.00 53.00 ATOM 85 CG ASP D 52 12.368 10.044 26.107 1.00 48.63 ATOM 86 OD1 ASP D 52 12.146 11.002 26.877 1.00 47.42 ATOM 87 OD2 ASP D 52 12.606 8.887 26.510 1.00 42.87 ATOM 88 N PRO D 53 13.326 13.870 24.387 1.00 44.91 ATOM 89 CA PRO D 53 14.453 14.799 24.220 1.00 51.90 ATOM 90 C PRO D 53 15.530 14.709 25.303 1.00 60.85 ATOM 91 O PRO D 53 15.241 14.321 26.434 1.00 57.66 ATOM 92 CB PRO D 53 13.778 16.175 24.242 1.00 45.73 ATOM 93 CG PRO D 53 12.497 15.960 24.978 1.00 48.83 ATOM 94 CD PRO D 53 12.055 14.576 24.621 1.00 45.65 ATOM 95 N VAL D 54 16.762 15.071 24.944 1.00 62.82 ATOM 96 CA VAL D 54 17.886 15.057 25.880 1.00 56.33 ATOM 97 C VAL D 54 18.703 16.353 25.809 1.00 66.89 ATOM 98 O VAL D 54 18.783 16.989 24.758 1.00 60.79 ATOM 99 CB VAL D 54 18.804 13.849 25.635 1.00 47.52 ATOM 100 CG1 VAL D 54 18.046 12.558 25.880 1.00 54.99 ATOM 101 CG2 VAL D 54 19.356 13.882 24.224 1.00 53.21 ATOM 102 N CYS D 55 19.310 16.732 26.933 1.00 66.81 ATOM 103 CA CYS D 55 20.017 18.010 27.056 1.00 70.01 ATOM 104 C CYS D 55 21.184 18.174 26.083 1.00 77.67 ATOM 105 O CYS D 55 21.005 18.649 24.960 1.00 81.01 ATOM 106 N VAL D 56 22.381 17.798 26.528 1.00 75.89 ATOM 107 CA VAL D 56 23.573 17.835 25.681 1.00 67.54 ATOM 108 C VAL D 56 24.097 19.251 25.451 1.00 74.84 ATOM 109 O VAL D 56 25.262 19.542 25.718 1.00 77.74 ATOM 110 N GLU D 57 23.230 20.123 24.949 1.00 80.35 ATOM 111 CA GLU D 57 23.594 21.508 24.674 1.00 73.85 ATOM 112 C GLU D 57 22.423 22.227 24.014 1.00 82.34 ATOM 113 O GLU D 57 21.269 22.031 24.397 1.00 88.20 ATOM 114 N GLY D 58 22.724 23.057 23.020 1.00 85.36 ATOM 115 CA GLY D 58 21.695 23.773 22.286 1.00 91.77 ATOM 116 C GLY D 58 20.918 22.858 21.359 1.00 94.48 ATOM 117 O GLY D 58 19.702 22.705 21.493 1.00 93.84 ATOM 118 N LYS D 59 21.625 22.257 20.406 1.00 94.99 ATOM 119 CA LYS D 59 21.038 21.251 19.529 1.00 99.23 ATOM 120 C LYS D 59 20.817 19.963 20.311 1.00 98.95 ATOM 121 O LYS D 59 21.527 18.976 20.110 1.00 98.86 ATOM 122 CB LYS D 59 21.943 20.987 18.323 1.00 98.30 ATOM 123 CG LYS D 59 21.921 22.080 17.261 1.00101.42 ATOM 124 CD LYS D 59 20.661 22.009 16.404 1.00103.74 ATOM 125 CE LYS D 59 19.721 23.178 16.672 1.00 97.59 ATOM 126 NZ LYS D 59 19.114 23.137 18.033 1.00 85.99 ATOM 127 N ILE D 60 19.831 19.990 21.205 1.00 91.02 ATOM 128 CA ILE D 60 19.528 18.866 22.090 1.00 88.87 ATOM 129 C ILE D 60 19.508 17.509 21.373 1.00 86.52 ATOM 130 O ILE D 60 20.557 16.988 20.988 1.00 80.33 ATOM 131 CB ILE D 60 18.206 19.093 22.866 1.00 76.81 ATOM 132 CG1 ILE D 60 17.056 19.450 21.917 1.00 75.43 ATOM 133 CG2 ILE D 60 18.386 20.195 23.897 1.00 77.93 ATOM 134 CD1 ILE D 60 17.021 20.907 21.502 1.00 77.18 ATOM 135 N TYR D 61 18.316 16.940 21.211 1.00 75.28 ATOM 136 CA TYR D 61 18.152 15.669 20.509 1.00 69.32 ATOM 137 C TYR D 61 16.770 15.081 20.750 1.00 58.16 ATOM 138 O TYR D 61 16.331 14.962 21.893 1.00 54.52 ATOM 139 CB TYR D 61 19.220 14.661 20.940 1.00 65.53 ATOM 140 N GLY D 62 16.094 14.714 19.666 1.00 50.13 ATOM 141 CA GLY D 62 14.786 14.091 19.751 1.00 46.64 ATOM 142 C GLY D 62 14.792 12.926 20.718 1.00 48.60 ATOM 143 O GLY D 62 13.830 12.711 21.452 1.00 45.93 ATOM 144 N ASN D 63 15.884 12.168 20.707 1.00 51.94 ATOM 145 CA ASN D 63 16.093 11.098 21.677 1.00 52.40 ATOM 146 C ASN D 63 17.579 10.833 21.919 1.00 55.01 ATOM 147 O ASN D 63 18.434 11.490 21.326 1.00 57.44 ATOM 148 CB ASN D 63 15.354 9.818 21.265 1.00 50.40 ATOM 149 CG ASN D 63 15.726 9.342 19.873 1.00 52.70 ATOM 150 OD1 ASN D 63 15.006 8.548 19.266 1.00 51.50 ATOM 151 ND2 ASN D 63 16.850 9.823 19.362 1.00 54.67 ATOM 152 N ARG D 64 17.882 9.882 22.797 1.00 58.81 ATOM 153 CA ARG D 64 19.268 9.581 23.142 1.00 62.78 ATOM 154 C ARG D 64 20.050 9.094 21.925 1.00 60.76 ATOM 155 O ARG D 64 21.230 9.405 21.775 1.00 60.64 ATOM 156 CB ARG D 64 19.339 8.547 24.269 1.00 57.12 ATOM 157 N CYS D 65 19.384 8.337 21.059 1.00 61.29 ATOM 158 CA CYS D 65 20.013 7.815 19.850 1.00 52.98 ATOM 159 C CYS D 65 20.439 8.951 18.923 1.00 59.93 ATOM 160 O CYS D 65 21.499 8.893 18.300 1.00 58.04 ATOM 161 CB CYS D 65 19.060 6.865 19.120 1.00 56.64 ATOM 162 SG CYS D 65 19.804 5.951 17.740 1.00 64.24 ATOM 163 N MET D 66 19.604 9.981 18.833 1.00 57.20 ATOM 164 CA MET D 66 19.902 11.136 17.998 1.00 59.46 ATOM 165 C MET D 66 21.048 11.950 18.591 1.00 53.28 ATOM 166 O MET D 66 21.856 12.519 17.861 1.00 58.10 ATOM 167 CB MET D 66 18.659 12.012 17.819 1.00 57.48 ATOM 168 N GLN D 67 21.112 12.002 19.918 1.00 55.24 ATOM 169 CA GLN D 67 22.222 12.654 20.603 1.00 56.46 ATOM 170 C GLN D 67 23.500 11.845 20.422 1.00 61.89 ATOM 171 O GLN D 67 24.586 12.405 20.289 1.00 65.06 ATOM 172 CB GLN D 67 21.920 12.810 22.092 1.00 55.21 ATOM 173 N SER D 68 23.359 10.522 20.413 1.00 55.11 ATOM 174 CA SER D 68 24.501 9.622 20.299 1.00 61.75 ATOM 175 C SER D 68 24.972 9.475 18.858 1.00 67.74 ATOM 176 O SER D 68 26.069 8.974 18.608 1.00 63.51 ATOM 177 CB SER D 68 24.163 8.246 20.877 1.00 53.94 ATOM 178 N HIS D 69 24.141 9.909 17.914 1.00 68.34 ATOM 179 CA HIS D 69 24.499 9.863 16.500 1.00 62.10 ATOM 180 C HIS D 69 25.703 10.760 16.243 1.00 68.48 ATOM 181 O HIS D 69 25.974 11.151 15.109 1.00 73.86 ATOM 182 CB HIS D 69 23.320 10.291 15.625 1.00 48.39 ATOM 183 N PHE D 70 26.412 11.090 17.318 1.00 67.82 ATOM 184 CA PHE D 70 27.655 11.844 17.247 1.00 68.63 ATOM 185 C PHE D 70 28.755 11.022 17.934 1.00 73.38 ATOM 186 O PHE D 70 28.880 10.998 19.161 1.00 62.55 ATOM 187 CB PHE D 70 27.460 13.234 17.850 1.00 61.68 ATOM 188 CG PHE D 70 26.347 14.016 17.196 1.00 74.43 ATOM 189 CD1 PHE D 70 25.025 13.613 17.332 1.00 73.46 ATOM 190 CD2 PHE D 70 26.620 15.139 16.433 1.00 85.69 ATOM 191 CE1 PHE D 70 23.997 14.319 16.726 1.00 70.99 ATOM 192 CE2 PHE D 70 25.592 15.851 15.825 1.00 90.36 ATOM 193 CZ PHE D 70 24.280 15.438 15.973 1.00 75.91 ATOM 194 N CYS D 71 29.548 10.363 17.092 1.00 69.40 ATOM 195 CA CYS D 71 30.320 9.160 17.426 1.00 64.04 ATOM 196 C CYS D 71 31.119 9.086 18.729 1.00 67.96 ATOM 197 O CYS D 71 31.686 10.074 19.195 1.00 73.18 ATOM 198 CB CYS D 71 31.247 8.809 16.261 1.00 56.71 ATOM 199 SG CYS D 71 30.890 7.217 15.505 1.00 63.73 ATOM 200 N GLY D 72 31.150 7.877 19.289 1.00 59.66 ATOM 201 CA GLY D 72 32.079 7.490 20.337 1.00 53.97 ATOM 202 C GLY D 72 32.031 8.223 21.662 1.00 62.69 ATOM 203 O GLY D 72 32.464 7.681 22.679 1.00 70.60 ATOM 204 N LYS D 73 31.508 9.445 21.651 1.00 70.29 ATOM 205 CA LYS D 73 31.552 10.345 22.806 1.00 65.13 ATOM 206 C LYS D 73 31.372 9.669 24.168 1.00 75.29 ATOM 207 O LYS D 73 30.804 8.580 24.270 1.00 73.62 ATOM 208 CB LYS D 73 30.524 11.468 22.641 1.00 70.75 ATOM 209 N VAL D 74 31.853 10.349 25.208 1.00 83.35 ATOM 210 CA VAL D 74 31.840 9.846 26.583 1.00 80.18 ATOM 211 C VAL D 74 30.597 9.019 26.918 1.00 76.67 ATOM 212 O VAL D 74 29.536 9.561 27.230 1.00 72.26 ATOM 213 CB VAL D 74 31.951 11.008 27.596 1.00 78.99 ATOM 214 CG1 VAL D 74 32.402 10.491 28.953 1.00 69.72 ATOM 215 CG2 VAL D 74 32.911 12.072 27.083 1.00 78.07 ATOM 216 OXT VAL D 74 30.626 7.786 26.898 1.00 64.83 TER