HEADER HYDROLASE/HYDROLASE INHIBITOR 24-OCT-91 1PPE TITLE THE REFINED 2.0 ANGSTROMS X-RAY CRYSTAL STRUCTURE OF THE COMPLEX TITLE 2 FORMED BETWEEN BOVINE BETA-TRYPSIN AND CMTI-I, A TRYPSIN INHIBITOR TITLE 3 FROM SQUASH SEEDS (CUCURBITA MAXIMA): TOPOLOGICAL SIMILARITY OF THE TITLE 4 SQUASH SEED INHIBITORS WITH THE CARBOXYPEPTIDASE A INHIBITOR FROM COMPND MOL_ID: 2; COMPND 2 MOLECULE: TRYPSIN INHIBITOR CMTI-I; COMPND 3 CHAIN: I; COMPND 4 ENGINEERED: YES; EXPDTA X-RAY DIFFRACTION REMARK 2 RESOLUTION. 2.00 ANGSTORMS DBREF 1PPE I 1 29 UNP P01074 ITR1_CUCMA 1 29 SEQRES 1 I 29 ARG VAL CYS PRO ARG ILE LEU MET GLU CYS LYS LYS ASP SEQRES 2 I 29 SER ASP CYS LEU ALA GLU CYS VAL CYS LEU GLU HIS GLY SEQRES 3 I 29 TYR CYS GLY ATOM 1 N ARG I 1 -0.012 18.656 10.567 1.00 33.34 ATOM 2 CA ARG I 1 -0.471 17.243 10.547 1.00 32.42 ATOM 3 C ARG I 1 0.571 16.320 11.166 1.00 24.38 ATOM 4 O ARG I 1 1.785 16.601 11.121 1.00 27.42 ATOM 5 CB ARG I 1 -0.702 16.787 9.099 1.00 18.37 ATOM 6 CG ARG I 1 -0.012 17.775 8.205 1.00 13.85 ATOM 7 CD ARG I 1 -0.579 17.675 6.778 1.00 20.56 ATOM 8 NE ARG I 1 -0.192 16.393 6.261 1.00 37.25 ATOM 9 CZ ARG I 1 0.962 16.055 5.690 1.00 28.69 ATOM 10 NH1 ARG I 1 1.981 16.864 5.350 1.00 30.80 ATOM 11 NH2 ARG I 1 0.905 14.866 5.208 1.00 23.22 ATOM 12 N VAL I 2 0.026 15.273 11.716 1.00 16.32 ATOM 13 CA VAL I 2 0.875 14.213 12.248 1.00 15.60 ATOM 14 C VAL I 2 1.167 13.185 11.159 1.00 14.33 ATOM 15 O VAL I 2 0.366 12.310 10.825 1.00 12.69 ATOM 16 CB VAL I 2 0.255 13.631 13.523 1.00 21.44 ATOM 17 CG1 VAL I 2 1.074 12.512 14.194 1.00 13.21 ATOM 18 CG2 VAL I 2 -0.100 14.784 14.482 1.00 15.92 ATOM 19 N CYS I 3 2.347 13.334 10.581 1.00 15.61 ATOM 20 CA CYS I 3 2.737 12.316 9.611 1.00 8.79 ATOM 21 C CYS I 3 4.069 11.610 9.986 1.00 11.83 ATOM 22 O CYS I 3 5.114 12.252 9.990 1.00 3.56 ATOM 23 CB CYS I 3 2.778 13.078 8.275 1.00 14.41 ATOM 24 SG CYS I 3 3.423 12.104 6.938 1.00 7.31 ATOM 25 N PRO I 4 4.020 10.344 10.379 1.00 11.42 ATOM 26 CA PRO I 4 5.234 9.570 10.623 1.00 3.00 ATOM 27 C PRO I 4 6.175 9.502 9.406 1.00 5.11 ATOM 28 O PRO I 4 5.713 9.516 8.264 1.00 3.00 ATOM 29 CB PRO I 4 4.769 8.201 10.988 1.00 3.00 ATOM 30 CG PRO I 4 3.295 8.161 10.609 1.00 14.11 ATOM 31 CD PRO I 4 2.778 9.571 10.661 1.00 3.60 ATOM 32 N ARG I 5 7.473 9.408 9.714 1.00 3.00 ATOM 33 CA ARG I 5 8.536 9.553 8.761 1.00 13.81 ATOM 34 C ARG I 5 8.913 8.253 8.124 1.00 3.00 ATOM 35 O ARG I 5 10.086 8.063 7.830 1.00 3.00 ATOM 36 CB ARG I 5 9.698 10.474 9.209 1.00 3.00 ATOM 37 CG ARG I 5 9.129 11.918 9.373 1.00 4.47 ATOM 38 CD ARG I 5 10.083 12.946 9.980 1.00 3.00 ATOM 39 NE ARG I 5 9.435 14.208 9.737 1.00 3.00 ATOM 40 CZ ARG I 5 10.007 15.325 10.111 1.00 6.07 ATOM 41 NH1 ARG I 5 11.134 15.314 10.789 1.00 4.50 ATOM 42 NH2 ARG I 5 9.530 16.492 9.780 1.00 5.62 ATOM 43 N ILE I 6 7.940 7.370 8.010 1.00 3.77 ATOM 44 CA ILE I 6 8.294 6.039 7.320 1.00 3.00 ATOM 45 C ILE I 6 8.189 6.218 5.792 1.00 9.34 ATOM 46 O ILE I 6 7.344 7.001 5.273 1.00 5.14 ATOM 47 CB ILE I 6 7.301 4.888 7.788 1.00 7.04 ATOM 48 CG1 ILE I 6 7.532 3.495 7.167 1.00 3.00 ATOM 49 CG2 ILE I 6 5.810 5.373 7.719 1.00 3.10 ATOM 50 CD1 ILE I 6 6.684 2.447 7.888 1.00 4.89 ATOM 51 N LEU I 7 9.040 5.428 5.094 1.00 11.09 ATOM 52 CA LEU I 7 8.936 5.443 3.612 1.00 3.00 ATOM 53 C LEU I 7 7.866 4.426 3.246 1.00 12.66 ATOM 54 O LEU I 7 8.001 3.257 3.615 1.00 4.25 ATOM 55 CB LEU I 7 10.253 4.985 2.969 1.00 7.89 ATOM 56 CG LEU I 7 10.264 5.001 1.393 1.00 13.86 ATOM 57 CD1 LEU I 7 9.758 6.343 0.885 1.00 13.88 ATOM 58 CD2 LEU I 7 11.704 4.868 0.845 1.00 5.11 ATOM 59 N MET I 8 6.749 4.932 2.683 1.00 8.64 ATOM 60 CA MET I 8 5.630 4.076 2.362 1.00 3.00 ATOM 61 C MET I 8 5.068 4.386 0.964 1.00 11.88 ATOM 62 O MET I 8 4.745 5.542 0.651 1.00 4.49 ATOM 63 CB MET I 8 4.582 4.222 3.471 1.00 5.23 ATOM 64 CG MET I 8 3.298 3.393 3.298 1.00 12.17 ATOM 65 SD MET I 8 2.179 3.301 4.796 1.00 24.21 ATOM 66 CE MET I 8 3.466 3.180 6.070 1.00 21.40 ATOM 67 N GLU I 9 5.087 3.351 0.099 1.00 7.23 ATOM 68 CA GLU I 9 4.505 3.490 -1.271 1.00 26.64 ATOM 69 C GLU I 9 2.999 3.719 -1.140 1.00 23.44 ATOM 70 O GLU I 9 2.355 3.149 -0.256 1.00 15.55 ATOM 71 CB GLU I 9 4.741 2.171 -2.053 1.00 10.59 ATOM 72 CG GLU I 9 6.107 2.125 -2.760 1.00 28.46 ATOM 73 CD GLU I 9 6.509 0.696 -3.149 1.00 17.54 ATOM 74 OE1 GLU I 9 5.806 -0.022 -3.883 1.00 29.40 ATOM 75 OE2 GLU I 9 7.564 0.181 -2.736 1.00 26.45 ATOM 76 N CYS I 10 2.394 4.509 -2.004 1.00 6.88 ATOM 77 CA CYS I 10 0.921 4.492 -1.912 1.00 5.74 ATOM 78 C CYS I 10 0.298 4.677 -3.311 1.00 33.94 ATOM 79 O CYS I 10 0.947 5.234 -4.199 1.00 14.26 ATOM 80 CB CYS I 10 0.542 5.639 -0.984 1.00 3.00 ATOM 81 SG CYS I 10 1.310 7.186 -1.506 1.00 5.50 ATOM 82 N LYS I 11 -1.007 4.522 -3.426 1.00 23.70 ATOM 83 CA LYS I 11 -1.724 4.992 -4.643 1.00 11.76 ATOM 84 C LYS I 11 -2.836 5.983 -4.312 1.00 12.95 ATOM 85 O LYS I 11 -3.238 6.796 -5.160 1.00 12.13 ATOM 86 CB LYS I 11 -2.377 3.813 -5.356 1.00 17.39 ATOM 87 CG LYS I 11 -1.368 3.061 -6.231 1.00 30.12 ATOM 88 CD LYS I 11 -2.057 2.034 -7.150 0.00 32.78 ATOM 89 CE LYS I 11 -1.349 0.664 -7.148 1.00 39.14 ATOM 90 NZ LYS I 11 -1.878 -0.167 -6.078 1.00 43.85 ATOM 91 N LYS I 12 -3.353 5.847 -3.091 1.00 13.80 ATOM 92 CA LYS I 12 -4.240 6.889 -2.635 1.00 13.15 ATOM 93 C LYS I 12 -3.922 7.351 -1.229 1.00 22.23 ATOM 94 O LYS I 12 -3.189 6.631 -0.556 1.00 8.06 ATOM 95 CB LYS I 12 -5.683 6.456 -2.676 1.00 11.87 ATOM 96 CG LYS I 12 -5.817 5.087 -2.101 1.00 11.39 ATOM 97 CD LYS I 12 -6.624 4.287 -3.139 1.00 31.10 ATOM 98 CE LYS I 12 -7.796 3.703 -2.414 1.00 42.73 ATOM 99 NZ LYS I 12 -7.206 3.112 -1.219 1.00 41.01 ATOM 100 N ASP I 13 -4.483 8.535 -0.889 1.00 11.51 ATOM 101 CA ASP I 13 -4.233 9.099 0.451 1.00 8.27 ATOM 102 C ASP I 13 -4.437 8.050 1.544 1.00 18.87 ATOM 103 O ASP I 13 -3.672 7.992 2.500 1.00 27.37 ATOM 104 CB ASP I 13 -5.119 10.312 0.788 1.00 24.47 ATOM 105 CG ASP I 13 -4.644 11.515 -0.011 1.00 13.86 ATOM 106 OD1 ASP I 13 -3.524 11.563 -0.569 1.00 8.36 ATOM 107 OD2 ASP I 13 -5.389 12.502 -0.131 1.00 10.42 ATOM 108 N SER I 14 -5.502 7.310 1.368 1.00 5.77 ATOM 109 CA SER I 14 -6.053 6.352 2.365 1.00 8.51 ATOM 110 C SER I 14 -5.088 5.192 2.564 1.00 3.52 ATOM 111 O SER I 14 -5.045 4.594 3.627 1.00 13.85 ATOM 112 CB SER I 14 -7.409 5.797 1.863 1.00 20.50 ATOM 113 OG SER I 14 -7.190 4.744 0.919 1.00 24.94 ATOM 114 N ASP I 15 -4.153 5.070 1.643 1.00 5.92 ATOM 115 CA ASP I 15 -3.080 4.085 1.893 1.00 10.99 ATOM 116 C ASP I 15 -2.142 4.483 3.045 1.00 22.47 ATOM 117 O ASP I 15 -1.297 3.673 3.411 1.00 12.29 ATOM 118 CB ASP I 15 -2.226 3.935 0.623 1.00 9.99 ATOM 119 CG ASP I 15 -3.026 3.262 -0.509 1.00 13.56 ATOM 120 OD1 ASP I 15 -4.089 2.633 -0.293 1.00 16.33 ATOM 121 OD2 ASP I 15 -2.624 3.343 -1.694 1.00 14.39 ATOM 122 N CYS I 16 -2.100 5.760 3.399 1.00 4.27 ATOM 123 CA CYS I 16 -0.988 6.246 4.223 1.00 3.00 ATOM 124 C CYS I 16 -1.230 6.112 5.731 1.00 11.88 ATOM 125 O CYS I 16 -2.383 6.117 6.126 1.00 15.03 ATOM 126 CB CYS I 16 -0.658 7.689 3.858 1.00 3.00 ATOM 127 SG CYS I 16 -0.015 7.744 2.188 1.00 5.76 ATOM 128 N LEU I 17 -0.176 6.332 6.564 1.00 12.85 ATOM 129 CA LEU I 17 -0.432 6.351 8.019 1.00 10.24 ATOM 130 C LEU I 17 -0.917 7.722 8.476 1.00 6.48 ATOM 131 O LEU I 17 -0.331 8.728 8.109 1.00 11.35 ATOM 132 CB LEU I 17 0.773 5.979 8.887 1.00 9.83 ATOM 133 CG LEU I 17 1.349 4.578 8.787 1.00 14.51 ATOM 134 CD1 LEU I 17 2.505 4.399 9.805 1.00 14.44 ATOM 135 CD2 LEU I 17 0.231 3.576 9.119 1.00 22.84 ATOM 136 N ALA I 18 -1.690 7.714 9.558 1.00 10.63 ATOM 137 CA ALA I 18 -1.940 8.949 10.351 1.00 10.47 ATOM 138 C ALA I 18 -2.506 10.079 9.518 1.00 12.73 ATOM 139 O ALA I 18 -3.381 9.851 8.704 1.00 19.62 ATOM 140 CB ALA I 18 -0.762 9.465 11.237 1.00 3.00 ATOM 141 N GLU I 19 -1.894 11.222 9.573 1.00 5.57 ATOM 142 CA GLU I 19 -2.302 12.256 8.644 1.00 3.00 ATOM 143 C GLU I 19 -1.206 12.558 7.647 1.00 3.00 ATOM 144 O GLU I 19 -1.253 13.631 7.037 1.00 8.05 ATOM 145 CB GLU I 19 -2.567 13.575 9.348 1.00 10.47 ATOM 146 CG GLU I 19 -3.787 13.482 10.312 1.00 18.79 ATOM 147 CD GLU I 19 -3.411 13.918 11.716 1.00 62.93 ATOM 148 OE1 GLU I 19 -3.038 15.114 11.925 1.00 37.65 ATOM 149 OE2 GLU I 19 -3.459 13.064 12.656 1.00 52.39 ATOM 150 N CYS I 20 -0.570 11.489 7.226 1.00 5.82 ATOM 151 CA CYS I 20 0.183 11.619 5.972 1.00 18.76 ATOM 152 C CYS I 20 -0.748 11.635 4.755 1.00 12.93 ATOM 153 O CYS I 20 -1.720 10.889 4.774 1.00 14.38 ATOM 154 CB CYS I 20 1.143 10.449 5.802 1.00 4.60 ATOM 155 SG CYS I 20 2.472 10.334 7.028 1.00 6.41 ATOM 156 N VAL I 21 -0.295 12.167 3.636 1.00 3.00 ATOM 157 CA VAL I 21 -1.112 11.983 2.405 1.00 10.33 ATOM 158 C VAL I 21 -0.274 11.315 1.312 1.00 19.31 ATOM 159 O VAL I 21 0.940 11.212 1.480 1.00 9.47 ATOM 160 CB VAL I 21 -1.601 13.370 1.944 1.00 3.03 ATOM 161 CG1 VAL I 21 -2.502 14.061 3.005 1.00 3.69 ATOM 162 CG2 VAL I 21 -0.379 14.273 1.593 1.00 8.57 ATOM 163 N CYS I 22 -0.900 10.873 0.213 1.00 7.02 ATOM 164 CA CYS I 22 -0.147 10.183 -0.822 1.00 3.33 ATOM 165 C CYS I 22 0.301 11.185 -1.842 1.00 14.48 ATOM 166 O CYS I 22 -0.574 11.811 -2.416 1.00 9.02 ATOM 167 CB CYS I 22 -1.026 9.221 -1.580 1.00 3.00 ATOM 168 SG CYS I 22 -0.083 8.169 -2.719 1.00 6.58 ATOM 169 N LEU I 23 1.606 11.400 -1.954 1.00 10.27 ATOM 170 CA LEU I 23 1.954 12.509 -2.853 1.00 15.09 ATOM 171 C LEU I 23 2.233 11.991 -4.267 1.00 23.96 ATOM 172 O LEU I 23 2.194 10.779 -4.482 1.00 24.44 ATOM 173 CB LEU I 23 3.200 13.140 -2.255 1.00 4.86 ATOM 174 CG LEU I 23 2.825 13.767 -0.918 1.00 12.51 ATOM 175 CD1 LEU I 23 4.090 14.020 -0.115 1.00 28.01 ATOM 176 CD2 LEU I 23 2.020 15.051 -1.191 1.00 16.05 ATOM 177 N GLU I 24 2.331 12.950 -5.184 1.00 11.91 ATOM 178 CA GLU I 24 2.634 12.810 -6.613 1.00 28.44 ATOM 179 C GLU I 24 3.552 11.634 -7.038 1.00 27.08 ATOM 180 O GLU I 24 3.166 10.950 -7.986 1.00 40.03 ATOM 181 CB GLU I 24 3.172 14.169 -7.133 1.00 42.99 ATOM 182 CG GLU I 24 3.185 14.302 -8.664 1.00 51.22 ATOM 183 CD GLU I 24 3.877 15.611 -9.033 0.00 34.20 ATOM 184 OE1 GLU I 24 3.404 16.711 -8.641 0.00 0.00 ATOM 185 OE2 GLU I 24 4.927 15.600 -9.729 0.00 0.00 ATOM 186 N HIS I 25 4.725 11.352 -6.467 1.00 12.40 ATOM 187 CA HIS I 25 5.504 10.137 -7.003 1.00 8.41 ATOM 188 C HIS I 25 5.266 8.835 -6.226 1.00 33.52 ATOM 189 O HIS I 25 6.027 7.881 -6.371 1.00 29.21 ATOM 190 CB HIS I 25 7.019 10.338 -7.046 1.00 17.26 ATOM 191 CG HIS I 25 7.256 11.745 -7.627 1.00 58.38 ATOM 192 ND1 HIS I 25 7.331 12.894 -6.769 1.00 46.25 ATOM 193 CD2 HIS I 25 7.364 12.135 -8.918 1.00 40.20 ATOM 194 CE1 HIS I 25 7.576 14.024 -7.584 1.00 43.88 ATOM 195 NE2 HIS I 25 7.590 13.524 -8.924 1.00 45.93 ATOM 196 N GLY I 26 4.099 8.724 -5.658 1.00 9.40 ATOM 197 CA GLY I 26 3.618 7.443 -5.199 1.00 3.00 ATOM 198 C GLY I 26 4.195 7.105 -3.824 1.00 6.20 ATOM 199 O GLY I 26 4.193 5.930 -3.421 1.00 9.81 ATOM 200 N TYR I 27 4.548 8.120 -3.105 1.00 3.00 ATOM 201 CA TYR I 27 4.999 7.886 -1.717 1.00 3.00 ATOM 202 C TYR I 27 4.202 8.755 -0.730 1.00 5.39 ATOM 203 O TYR I 27 3.910 9.905 -1.031 1.00 6.99 ATOM 204 CB TYR I 27 6.478 8.247 -1.570 1.00 3.00 ATOM 205 CG TYR I 27 7.404 7.240 -2.258 1.00 11.13 ATOM 206 CD1 TYR I 27 7.575 5.979 -1.723 1.00 9.16 ATOM 207 CD2 TYR I 27 8.045 7.606 -3.424 1.00 4.25 ATOM 208 CE1 TYR I 27 8.373 5.037 -2.358 1.00 4.25 ATOM 209 CE2 TYR I 27 8.855 6.672 -4.073 1.00 8.50 ATOM 210 CZ TYR I 27 9.004 5.402 -3.552 1.00 24.42 ATOM 211 OH TYR I 27 9.793 4.501 -4.193 1.00 30.06 ATOM 212 N CYS I 28 3.961 8.263 0.468 1.00 9.03 ATOM 213 CA CYS I 28 3.327 9.063 1.536 1.00 3.96 ATOM 214 C CYS I 28 4.208 10.216 2.041 1.00 5.72 ATOM 215 O CYS I 28 5.451 10.154 1.995 1.00 3.00 ATOM 216 CB CYS I 28 2.971 8.120 2.708 1.00 3.00 ATOM 217 SG CYS I 28 1.821 6.789 2.307 1.00 6.81 ATOM 218 N GLY I 29 3.556 11.233 2.584 1.00 3.00 ATOM 219 CA GLY I 29 4.383 12.342 2.982 1.00 3.56 ATOM 220 C GLY I 29 3.413 13.353 3.495 1.00 14.31 ATOM 221 O GLY I 29 2.314 12.944 3.855 1.00 3.00 ATOM 222 OXT GLY I 29 3.859 14.453 3.888 1.00 11.48 TER