HEADER HYDROLASE/HYDROLASE INHIBITOR 24-OCT-92 1MCT TITLE THE REFINED 1.6 ANGSTROMS RESOLUTION CRYSTAL STRUCTURE OF THE COMPLEX TITLE 2 FORMED BETWEEN PORCINE BETA-TRYPSIN AND MCTI-A, A TRYPSIN INHIBITOR TITLE 3 OF SQUASH FAMILY COMPND MOL_ID: 2; COMPND 2 MOLECULE: TRYPSIN INHIBITOR A; COMPND 3 CHAIN: I; COMPND 4 ENGINEERED: YES; EXPDTA X-RAY DIFFRACTION REMARK 2 RESOLUTION. 1.60 ANGSTORMS DBREF 1MCT I 1 28 UNP P30709 ITRA_MOMCH 1 28 SEQRES 1 I 28 ARG ILE CYS PRO ARG ILE TRP MET GLU CYS THR ARG ASP SEQRES 2 I 28 SER ASP CYS MET ALA LYS CYS ILE CYS VAL ALA GLY HIS SEQRES 3 I 28 CYS GLY ATOM 1 N ARG I 1 4.580 17.972 13.160 1.00 52.42 ATOM 2 CA ARG I 1 5.557 19.089 12.941 1.00 60.31 ATOM 3 C ARG I 1 4.645 20.348 12.884 1.00 66.50 ATOM 4 O ARG I 1 3.504 20.069 12.500 1.00 32.73 ATOM 5 CB ARG I 1 6.283 18.774 11.615 1.00 65.94 ATOM 6 CG ARG I 1 6.650 17.284 11.382 1.00 82.68 ATOM 7 CD ARG I 1 6.785 16.808 9.905 1.00 69.65 ATOM 8 NE ARG I 1 5.881 17.628 9.122 1.00 82.19 ATOM 9 CZ ARG I 1 4.593 17.451 8.839 1.00 86.08 ATOM 10 NH1 ARG I 1 3.866 16.380 9.123 1.00 97.11 ATOM 11 NH2 ARG I 1 4.059 18.438 8.197 1.00 86.52 ATOM 12 H1 ARG I 1 4.021 18.174 14.007 1.00 0.00 ATOM 13 H2 ARG I 1 3.895 18.046 12.368 1.00 0.00 ATOM 14 H3 ARG I 1 5.051 17.048 13.194 1.00 0.00 ATOM 15 HE ARG I 1 6.320 18.404 8.721 1.00 0.00 ATOM 16 HH11 ARG I 1 4.248 15.576 9.563 1.00 0.00 ATOM 17 HH12 ARG I 1 2.893 16.376 8.844 1.00 0.00 ATOM 18 HH21 ARG I 1 4.602 19.233 7.952 1.00 0.00 ATOM 19 HH22 ARG I 1 3.082 18.413 7.920 1.00 0.00 ATOM 20 N ILE I 2 4.955 21.618 13.305 1.00 28.52 ATOM 21 CA ILE I 2 3.980 22.750 13.247 1.00 22.20 ATOM 22 C ILE I 2 3.574 22.893 11.785 1.00 18.41 ATOM 23 O ILE I 2 4.427 23.146 10.911 1.00 19.29 ATOM 24 CB ILE I 2 4.473 24.221 13.625 1.00 26.41 ATOM 25 CG1 ILE I 2 4.769 24.312 15.095 1.00 59.65 ATOM 26 CG2 ILE I 2 3.377 25.277 13.308 1.00 17.01 ATOM 27 CD1 ILE I 2 4.731 25.734 15.648 1.00 51.59 ATOM 28 H ILE I 2 5.858 21.862 13.520 1.00 0.00 ATOM 29 N CYS I 3 2.292 22.680 11.555 1.00 14.42 ATOM 30 CA CYS I 3 1.855 22.768 10.179 1.00 7.53 ATOM 31 C CYS I 3 0.533 23.535 10.194 1.00 13.10 ATOM 32 O CYS I 3 -0.435 23.060 10.816 1.00 13.12 ATOM 33 CB CYS I 3 1.690 21.362 9.650 1.00 11.69 ATOM 34 SG CYS I 3 1.056 21.439 7.982 1.00 17.58 ATOM 35 H CYS I 3 1.642 22.433 12.249 1.00 0.00 ATOM 36 N PRO I 4 0.504 24.759 9.627 1.00 11.25 ATOM 37 CA PRO I 4 -0.720 25.569 9.501 1.00 14.76 ATOM 38 C PRO I 4 -1.834 24.775 8.782 1.00 9.33 ATOM 39 O PRO I 4 -1.523 24.062 7.813 1.00 10.57 ATOM 40 CB PRO I 4 -0.284 26.805 8.707 1.00 16.46 ATOM 41 CG PRO I 4 1.174 26.856 8.940 1.00 18.82 ATOM 42 CD PRO I 4 1.612 25.441 8.915 1.00 11.04 ATOM 43 N ARG I 5 -3.107 25.008 9.125 1.00 9.73 ATOM 44 CA ARG I 5 -4.191 24.246 8.523 1.00 10.81 ATOM 45 C ARG I 5 -4.806 24.856 7.247 1.00 11.39 ATOM 46 O ARG I 5 -6.028 24.871 7.024 1.00 8.03 ATOM 47 CB ARG I 5 -5.205 23.977 9.651 1.00 8.04 ATOM 48 CG ARG I 5 -4.587 22.892 10.500 1.00 11.77 ATOM 49 CD ARG I 5 -5.263 22.598 11.810 1.00 14.99 ATOM 50 NE ARG I 5 -4.605 21.419 12.405 1.00 11.70 ATOM 51 CZ ARG I 5 -5.022 20.822 13.534 1.00 11.60 ATOM 52 NH1 ARG I 5 -6.080 21.319 14.197 1.00 11.47 ATOM 53 NH2 ARG I 5 -4.481 19.651 13.888 1.00 11.78 ATOM 54 H ARG I 5 -3.324 25.644 9.843 1.00 0.00 ATOM 55 HE ARG I 5 -3.791 21.077 11.968 1.00 0.00 ATOM 56 HH11 ARG I 5 -6.456 22.224 13.998 1.00 0.00 ATOM 57 HH12 ARG I 5 -6.482 20.814 14.981 1.00 0.00 ATOM 58 HH21 ARG I 5 -3.723 19.244 13.361 1.00 0.00 ATOM 59 HH22 ARG I 5 -4.861 19.115 14.657 1.00 0.00 ATOM 60 N ILE I 6 -3.958 25.504 6.446 1.00 9.41 ATOM 61 CA ILE I 6 -4.346 26.062 5.155 1.00 10.57 ATOM 62 C ILE I 6 -4.305 24.940 4.116 1.00 12.37 ATOM 63 O ILE I 6 -3.514 23.994 4.251 1.00 12.57 ATOM 64 CB ILE I 6 -3.364 27.260 4.799 1.00 12.43 ATOM 65 CG1 ILE I 6 -3.783 27.921 3.467 1.00 8.30 ATOM 66 CG2 ILE I 6 -1.903 26.748 4.751 1.00 11.52 ATOM 67 CD1 ILE I 6 -3.010 29.190 3.198 1.00 7.34 ATOM 68 H ILE I 6 -2.998 25.426 6.652 1.00 0.00 ATOM 69 N TRP I 7 -5.209 25.006 3.140 1.00 8.86 ATOM 70 CA TRP I 7 -5.194 24.078 2.015 1.00 12.34 ATOM 71 C TRP I 7 -4.197 24.629 0.976 1.00 12.44 ATOM 72 O TRP I 7 -4.330 25.779 0.517 1.00 15.32 ATOM 73 CB TRP I 7 -6.599 23.979 1.418 1.00 12.84 ATOM 74 CG TRP I 7 -6.639 23.034 0.251 1.00 17.20 ATOM 75 CD1 TRP I 7 -6.844 21.681 0.272 1.00 20.82 ATOM 76 CD2 TRP I 7 -6.478 23.400 -1.125 1.00 21.54 ATOM 77 NE1 TRP I 7 -6.826 21.187 -1.007 1.00 26.17 ATOM 78 CE2 TRP I 7 -6.604 22.215 -1.889 1.00 31.71 ATOM 79 CE3 TRP I 7 -6.239 24.617 -1.772 1.00 19.92 ATOM 80 CZ2 TRP I 7 -6.508 22.220 -3.280 1.00 32.22 ATOM 81 CZ3 TRP I 7 -6.143 24.616 -3.152 1.00 35.12 ATOM 82 CH2 TRP I 7 -6.276 23.429 -3.887 1.00 29.61 ATOM 83 H TRP I 7 -5.877 25.730 3.132 1.00 0.00 ATOM 84 HE1 TRP I 7 -6.991 20.245 -1.220 1.00 0.00 ATOM 85 N MET I 8 -3.240 23.786 0.589 1.00 12.01 ATOM 86 CA MET I 8 -2.219 24.206 -0.335 1.00 12.22 ATOM 87 C MET I 8 -1.726 22.974 -1.099 1.00 15.86 ATOM 88 O MET I 8 -1.430 21.922 -0.523 1.00 17.65 ATOM 89 CB MET I 8 -1.100 24.875 0.501 1.00 14.06 ATOM 90 CG MET I 8 -0.043 25.662 -0.248 1.00 40.24 ATOM 91 SD MET I 8 1.137 26.441 0.869 1.00 33.84 ATOM 92 CE MET I 8 0.179 27.791 1.485 1.00 30.45 ATOM 93 H MET I 8 -3.207 22.867 0.946 1.00 0.00 ATOM 94 N GLU I 9 -1.743 23.077 -2.409 1.00 21.58 ATOM 95 CA GLU I 9 -1.129 22.059 -3.258 1.00 23.23 ATOM 96 C GLU I 9 0.389 22.255 -3.278 1.00 18.87 ATOM 97 O GLU I 9 0.887 23.357 -3.006 1.00 21.49 ATOM 98 CB GLU I 9 -1.635 22.174 -4.665 1.00 29.03 ATOM 99 CG GLU I 9 -3.122 21.953 -4.763 1.00 44.55 ATOM 100 CD GLU I 9 -3.566 21.976 -6.212 1.00 57.40 ATOM 101 OE1 GLU I 9 -3.386 23.023 -6.873 1.00 50.27 ATOM 102 OE2 GLU I 9 -4.088 20.940 -6.669 1.00 62.50 ATOM 103 H GLU I 9 -2.168 23.858 -2.819 1.00 0.00 ATOM 104 N CYS I 10 1.129 21.215 -3.614 1.00 19.00 ATOM 105 CA CYS I 10 2.590 21.301 -3.618 1.00 20.78 ATOM 106 C CYS I 10 3.065 20.176 -4.516 1.00 22.82 ATOM 107 O CYS I 10 2.307 19.244 -4.844 1.00 23.85 ATOM 108 CB CYS I 10 3.173 21.100 -2.188 1.00 14.49 ATOM 109 SG CYS I 10 2.458 19.631 -1.392 1.00 19.20 ATOM 110 H CYS I 10 0.707 20.361 -3.866 1.00 0.00 ATOM 111 N THR I 11 4.297 20.322 -4.959 1.00 31.04 ATOM 112 CA THR I 11 4.987 19.250 -5.636 1.00 38.45 ATOM 113 C THR I 11 6.223 18.956 -4.797 1.00 37.28 ATOM 114 O THR I 11 6.644 17.804 -4.809 1.00 32.21 ATOM 115 CB THR I 11 5.426 19.585 -7.123 1.00 55.95 ATOM 116 OG1 THR I 11 6.082 20.859 -7.313 1.00 65.77 ATOM 117 CG2 THR I 11 4.147 19.543 -7.962 1.00 58.24 ATOM 118 H THR I 11 4.743 21.174 -4.845 1.00 0.00 ATOM 119 HG1 THR I 11 6.802 20.961 -6.672 1.00 0.00 ATOM 120 N ARG I 12 6.838 19.926 -4.115 1.00 18.25 ATOM 121 CA ARG I 12 7.951 19.625 -3.239 1.00 17.73 ATOM 122 C ARG I 12 7.662 20.122 -1.847 1.00 23.85 ATOM 123 O ARG I 12 6.832 21.015 -1.655 1.00 23.34 ATOM 124 CB ARG I 12 9.236 20.274 -3.757 1.00 30.28 ATOM 125 CG ARG I 12 9.689 19.627 -5.049 1.00 40.41 ATOM 126 CD ARG I 12 10.937 20.281 -5.543 1.00 34.47 ATOM 127 NE ARG I 12 12.140 19.637 -5.027 1.00 57.60 ATOM 128 CZ ARG I 12 12.826 18.684 -5.673 1.00 63.95 ATOM 129 NH1 ARG I 12 12.420 18.255 -6.884 1.00 46.47 ATOM 130 NH2 ARG I 12 13.964 18.238 -5.141 1.00 60.03 ATOM 131 H ARG I 12 6.534 20.858 -4.180 1.00 0.00 ATOM 132 HE ARG I 12 12.421 19.924 -4.127 1.00 0.00 ATOM 133 HH11 ARG I 12 11.592 18.634 -7.289 1.00 0.00 ATOM 134 HH12 ARG I 12 12.931 17.577 -7.412 1.00 0.00 ATOM 135 HH21 ARG I 12 14.289 18.508 -4.237 1.00 0.00 ATOM 136 HH22 ARG I 12 14.516 17.521 -5.571 1.00 0.00 ATOM 137 N ASP I 13 8.381 19.584 -0.876 1.00 22.27 ATOM 138 CA ASP I 13 8.229 19.963 0.526 1.00 20.69 ATOM 139 C ASP I 13 8.403 21.444 0.728 1.00 23.83 ATOM 140 O ASP I 13 7.748 22.031 1.588 1.00 24.31 ATOM 141 CB ASP I 13 9.252 19.279 1.446 1.00 17.32 ATOM 142 CG ASP I 13 9.022 17.799 1.625 1.00 39.84 ATOM 143 OD1 ASP I 13 7.859 17.358 1.536 1.00 20.63 ATOM 144 OD2 ASP I 13 10.011 17.093 1.882 1.00 28.90 ATOM 145 H ASP I 13 8.951 18.806 -1.094 1.00 0.00 ATOM 146 N SER I 14 9.314 22.013 -0.055 1.00 19.25 ATOM 147 CA SER I 14 9.649 23.428 0.005 1.00 37.85 ATOM 148 C SER I 14 8.470 24.336 -0.328 1.00 38.82 ATOM 149 O SER I 14 8.526 25.499 0.068 1.00 33.53 ATOM 150 CB SER I 14 10.821 23.704 -0.958 1.00 44.96 ATOM 151 OG SER I 14 10.712 22.852 -2.085 1.00 59.93 ATOM 152 H SER I 14 9.770 21.467 -0.736 1.00 0.00 ATOM 153 HG SER I 14 9.910 23.066 -2.581 1.00 0.00 ATOM 154 N ASP I 15 7.469 23.806 -1.036 1.00 20.36 ATOM 155 CA ASP I 15 6.275 24.577 -1.369 1.00 24.13 ATOM 156 C ASP I 15 5.408 24.914 -0.156 1.00 28.04 ATOM 157 O ASP I 15 4.687 25.917 -0.158 1.00 28.69 ATOM 158 CB ASP I 15 5.431 23.800 -2.388 1.00 26.59 ATOM 159 CG ASP I 15 6.122 23.613 -3.726 1.00 43.57 ATOM 160 OD1 ASP I 15 7.043 24.376 -4.068 1.00 29.62 ATOM 161 OD2 ASP I 15 5.791 22.649 -4.438 1.00 29.94 ATOM 162 H ASP I 15 7.517 22.895 -1.387 1.00 0.00 ATOM 163 N CYS I 16 5.513 24.089 0.882 1.00 21.13 ATOM 164 CA CYS I 16 4.665 24.212 2.063 1.00 20.50 ATOM 165 C CYS I 16 5.170 25.183 3.116 1.00 25.72 ATOM 166 O CYS I 16 6.332 25.610 3.111 1.00 24.72 ATOM 167 CB CYS I 16 4.492 22.833 2.669 1.00 10.81 ATOM 168 SG CYS I 16 3.830 21.689 1.447 1.00 15.94 ATOM 169 H CYS I 16 6.199 23.395 0.867 1.00 0.00 ATOM 170 N MET I 17 4.265 25.542 4.020 1.00 21.20 ATOM 171 CA MET I 17 4.595 26.450 5.112 1.00 17.28 ATOM 172 C MET I 17 5.115 25.702 6.327 1.00 20.94 ATOM 173 O MET I 17 4.775 24.550 6.597 1.00 17.79 ATOM 174 CB MET I 17 3.383 27.251 5.573 1.00 15.67 ATOM 175 CG MET I 17 2.783 28.202 4.590 1.00 32.34 ATOM 176 SD MET I 17 1.467 29.083 5.453 1.00 27.75 ATOM 177 CE MET I 17 1.027 30.178 4.122 1.00 21.33 ATOM 178 H MET I 17 3.362 25.159 3.983 1.00 0.00 ATOM 179 N ALA I 18 5.909 26.455 7.072 1.00 22.70 ATOM 180 CA ALA I 18 6.500 26.034 8.326 1.00 23.38 ATOM 181 C ALA I 18 7.011 24.597 8.226 1.00 22.64 ATOM 182 O ALA I 18 7.731 24.293 7.269 1.00 22.60 ATOM 183 CB ALA I 18 5.433 26.231 9.428 1.00 16.21 ATOM 184 H ALA I 18 6.144 27.339 6.724 1.00 0.00 ATOM 185 N LYS I 19 6.638 23.711 9.141 1.00 16.66 ATOM 186 CA LYS I 19 7.120 22.357 9.092 1.00 18.01 ATOM 187 C LYS I 19 6.135 21.460 8.357 1.00 22.19 ATOM 188 O LYS I 19 6.222 20.238 8.532 1.00 19.97 ATOM 189 CB LYS I 19 7.368 21.882 10.530 1.00 25.42 ATOM 190 CG LYS I 19 8.480 22.612 11.289 1.00 26.36 ATOM 191 CD LYS I 19 8.191 22.679 12.794 1.00 52.80 ATOM 192 CE LYS I 19 8.287 21.398 13.630 1.00 56.50 ATOM 193 NZ LYS I 19 7.744 21.578 15.023 1.00 47.35 ATOM 194 H LYS I 19 5.989 23.941 9.838 1.00 0.00 ATOM 195 HZ1 LYS I 19 6.767 21.907 15.088 1.00 0.00 ATOM 196 HZ2 LYS I 19 7.842 20.721 15.614 1.00 0.00 ATOM 197 HZ3 LYS I 19 8.315 22.288 15.520 1.00 0.00 ATOM 198 N CYS I 20 5.199 21.964 7.549 1.00 19.47 ATOM 199 CA CYS I 20 4.357 21.091 6.730 1.00 16.68 ATOM 200 C CYS I 20 5.235 20.378 5.679 1.00 23.22 ATOM 201 O CYS I 20 6.300 20.883 5.321 1.00 20.95 ATOM 202 CB CYS I 20 3.292 21.839 5.951 1.00 15.06 ATOM 203 SG CYS I 20 2.157 22.793 6.985 1.00 17.10 ATOM 204 H CYS I 20 5.112 22.935 7.461 1.00 0.00 ATOM 205 N ILE I 21 4.900 19.177 5.255 1.00 18.22 ATOM 206 CA ILE I 21 5.591 18.533 4.149 1.00 25.07 ATOM 207 C ILE I 21 4.540 18.275 3.072 1.00 24.63 ATOM 208 O ILE I 21 3.330 18.395 3.327 1.00 18.62 ATOM 209 CB ILE I 21 6.249 17.195 4.574 1.00 26.90 ATOM 210 CG1 ILE I 21 5.282 16.313 5.353 1.00 29.07 ATOM 211 CG2 ILE I 21 7.496 17.546 5.365 1.00 26.73 ATOM 212 CD1 ILE I 21 5.693 14.869 5.374 1.00 39.26 ATOM 213 H ILE I 21 4.094 18.723 5.587 1.00 0.00 ATOM 214 N CYS I 22 4.999 17.967 1.873 1.00 15.82 ATOM 215 CA CYS I 22 4.108 17.773 0.754 1.00 12.91 ATOM 216 C CYS I 22 3.731 16.310 0.770 1.00 30.91 ATOM 217 O CYS I 22 4.523 15.442 0.428 1.00 25.12 ATOM 218 CB CYS I 22 4.848 18.167 -0.515 1.00 16.98 ATOM 219 SG CYS I 22 3.723 18.138 -1.937 1.00 22.22 ATOM 220 H CYS I 22 5.959 17.792 1.739 1.00 0.00 ATOM 221 N VAL I 23 2.535 15.986 1.185 1.00 29.18 ATOM 222 CA VAL I 23 2.071 14.611 1.255 1.00 21.86 ATOM 223 C VAL I 23 1.078 14.469 0.112 1.00 32.31 ATOM 224 O VAL I 23 -0.019 15.025 0.142 1.00 38.47 ATOM 225 CB VAL I 23 1.390 14.376 2.623 1.00 44.66 ATOM 226 CG1 VAL I 23 0.844 12.970 2.679 1.00 51.52 ATOM 227 CG2 VAL I 23 2.386 14.576 3.744 1.00 37.51 ATOM 228 H VAL I 23 1.937 16.697 1.497 1.00 0.00 ATOM 229 N ALA I 24 1.531 13.792 -0.927 1.00 34.00 ATOM 230 CA ALA I 24 0.732 13.510 -2.118 1.00 49.84 ATOM 231 C ALA I 24 0.033 14.742 -2.733 1.00 25.81 ATOM 232 O ALA I 24 -1.192 14.838 -2.873 1.00 37.25 ATOM 233 CB ALA I 24 -0.281 12.401 -1.743 1.00 55.10 ATOM 234 H ALA I 24 2.457 13.476 -0.873 1.00 0.00 ATOM 235 N GLY I 25 0.855 15.716 -3.066 1.00 20.57 ATOM 236 CA GLY I 25 0.345 16.887 -3.743 1.00 32.55 ATOM 237 C GLY I 25 -0.315 17.903 -2.851 1.00 23.10 ATOM 238 O GLY I 25 -0.800 18.912 -3.373 1.00 24.38 ATOM 239 H GLY I 25 1.805 15.669 -2.855 1.00 0.00 ATOM 240 N HIS I 26 -0.434 17.676 -1.542 1.00 22.39 ATOM 241 CA HIS I 26 -0.920 18.734 -0.653 1.00 23.38 ATOM 242 C HIS I 26 -0.043 18.820 0.585 1.00 16.32 ATOM 243 O HIS I 26 0.536 17.815 1.015 1.00 18.72 ATOM 244 CB HIS I 26 -2.359 18.506 -0.153 1.00 31.99 ATOM 245 CG HIS I 26 -3.344 18.321 -1.269 1.00 67.50 ATOM 246 ND1 HIS I 26 -3.715 19.248 -2.249 1.00 73.58 ATOM 247 CD2 HIS I 26 -4.018 17.186 -1.574 1.00 59.96 ATOM 248 CE1 HIS I 26 -4.563 18.707 -3.112 1.00 66.91 ATOM 249 NE2 HIS I 26 -4.750 17.455 -2.701 1.00 79.20 ATOM 250 H HIS I 26 -0.201 16.807 -1.141 1.00 0.00 ATOM 251 HD1 HIS I 26 -3.370 20.165 -2.370 1.00 0.00 ATOM 252 HE2 HIS I 26 -5.304 16.760 -3.122 1.00 0.00 ATOM 253 N CYS I 27 0.026 20.015 1.133 1.00 11.90 ATOM 254 CA CYS I 27 0.781 20.242 2.358 1.00 11.14 ATOM 255 C CYS I 27 0.045 19.677 3.559 1.00 12.73 ATOM 256 O CYS I 27 -1.198 19.726 3.604 1.00 15.10 ATOM 257 CB CYS I 27 0.995 21.731 2.539 1.00 12.44 ATOM 258 SG CYS I 27 1.946 22.392 1.138 1.00 16.96 ATOM 259 H CYS I 27 -0.413 20.782 0.708 1.00 0.00 ATOM 260 N GLY I 28 0.750 19.088 4.507 1.00 13.06 ATOM 261 CA GLY I 28 0.105 18.558 5.706 1.00 13.39 ATOM 262 C GLY I 28 1.163 18.193 6.720 1.00 25.20 ATOM 263 O GLY I 28 0.850 17.900 7.886 1.00 22.16 ATOM 264 OXT GLY I 28 2.355 18.244 6.366 1.00 15.60 ATOM 265 H GLY I 28 1.718 18.946 4.421 1.00 0.00 TER