HEADER TOXIN 23-SEP-03 1R1G TITLE Crystal Structure of the Scorpion Toxin BmBKTtx1 COMPND MOL_ID: 1; COMPND 2 MOLECULE: Neurotoxin BmK37; COMPND 3 CHAIN: A, B; COMPND 4 ENGINEERED: YES; EXPDTA X-RAY DIFFRACTION REMARK 2 RESOLUTION. 1.72 ANGSTORMS DBREF 1R1G A 1 31 UNP P83407 SCBX_MESMA 1 31 MODRES 1R1G LAL A 1 ALA N,N-DIMETHYL-L-ALANINE MODRES 1R1G MLY A 11 LYS N-DIMETHYL-LYSINE MODRES 1R1G MLY A 21 LYS N-DIMETHYL-LYSINE MODRES 1R1G MLY A 26 LYS N-DIMETHYL-LYSINE MODRES 1R1G MLY A 28 LYS N-DIMETHYL-LYSINE MODRES 1R1G MLY A 31 LYS N-DIMETHYL-LYSINE SEQRES 1 A 31 ALA ALA CYS TYR SER SER ASP CYS ARG VAL LYS CYS VAL SEQRES 2 A 31 ALA MET GLY PHE SER SER GLY LYS CYS ILE ASN SER LYS SEQRES 3 A 31 CYS LYS CYS TYR LYS ATOM 1 CB LAL A 1 -1.377 7.822 15.018 1.00 24.10 ATOM 2 C LAL A 1 -0.547 7.775 12.667 1.00 23.64 ATOM 3 O LAL A 1 -0.340 6.791 11.950 1.00 24.31 ATOM 4 N LAL A 1 -2.732 6.733 13.267 1.00 24.18 ATOM 5 CA LAL A 1 -1.786 7.854 13.556 1.00 23.87 ATOM 6 N ALA A 2 0.272 8.820 12.715 1.00 21.55 ATOM 7 CA ALA A 2 1.488 8.865 11.918 1.00 18.73 ATOM 8 C ALA A 2 2.524 7.942 12.546 1.00 17.73 ATOM 9 O ALA A 2 2.706 7.939 13.761 1.00 19.23 ATOM 10 CB ALA A 2 2.024 10.289 11.864 1.00 18.36 ATOM 11 N CYS A 3 3.209 7.165 11.718 1.00 15.35 ATOM 12 CA CYS A 3 4.227 6.253 12.224 1.00 13.71 ATOM 13 C CYS A 3 5.563 6.589 11.569 1.00 13.28 ATOM 14 O CYS A 3 5.666 6.616 10.350 1.00 12.67 ATOM 15 CB CYS A 3 3.850 4.798 11.905 1.00 13.56 ATOM 16 SG CYS A 3 4.869 3.545 12.763 1.00 13.77 ATOM 17 N TYR A 4 6.572 6.863 12.389 1.00 12.52 ATOM 18 CA TYR A 4 7.919 7.164 11.907 1.00 12.34 ATOM 19 C TYR A 4 8.744 6.009 12.455 1.00 12.13 ATOM 20 O TYR A 4 8.769 5.778 13.665 1.00 12.77 ATOM 21 CB TYR A 4 8.389 8.506 12.472 1.00 12.39 ATOM 22 CG TYR A 4 7.430 9.633 12.173 1.00 14.08 ATOM 23 CD1 TYR A 4 7.032 10.518 13.170 1.00 13.92 ATOM 24 CD2 TYR A 4 6.877 9.786 10.897 1.00 14.17 ATOM 25 CE1 TYR A 4 6.106 11.525 12.911 1.00 14.95 ATOM 26 CE2 TYR A 4 5.950 10.786 10.631 1.00 14.86 ATOM 27 CZ TYR A 4 5.570 11.651 11.643 1.00 15.15 ATOM 28 OH TYR A 4 4.649 12.643 11.387 1.00 17.95 ATOM 29 N SER A 5 9.407 5.279 11.562 1.00 12.37 ATOM 30 CA SER A 5 10.204 4.113 11.949 1.00 12.67 ATOM 31 C SER A 5 11.105 4.296 13.171 1.00 12.77 ATOM 32 O SER A 5 11.123 3.444 14.059 1.00 12.94 ATOM 33 CB SER A 5 11.040 3.618 10.758 1.00 13.40 ATOM 34 OG SER A 5 11.850 4.643 10.208 0.50 13.80 ATOM 35 N SER A 6 11.855 5.393 13.214 1.00 13.31 ATOM 36 CA SER A 6 12.748 5.656 14.343 1.00 13.86 ATOM 37 C SER A 6 11.983 5.923 15.636 1.00 13.42 ATOM 38 O SER A 6 12.348 5.414 16.694 1.00 14.29 ATOM 39 CB SER A 6 13.672 6.842 14.025 1.00 14.48 ATOM 40 OG SER A 6 12.943 8.053 13.928 1.00 17.98 ATOM 41 N ASP A 7 10.910 6.704 15.535 1.00 12.39 ATOM 42 CA ASP A 7 10.076 7.060 16.685 1.00 11.83 ATOM 43 C ASP A 7 9.382 5.823 17.255 1.00 11.42 ATOM 44 O ASP A 7 9.317 5.633 18.473 1.00 11.01 ATOM 45 CB ASP A 7 9.040 8.110 16.252 1.00 12.95 ATOM 46 CG ASP A 7 8.124 8.544 17.386 1.00 13.45 ATOM 47 OD1 ASP A 7 6.900 8.345 17.277 1.00 14.35 ATOM 48 OD2 ASP A 7 8.626 9.085 18.386 1.00 15.79 ATOM 49 N CYS A 8 8.866 4.984 16.365 1.00 11.33 ATOM 50 CA CYS A 8 8.186 3.757 16.764 1.00 11.47 ATOM 51 C CYS A 8 9.160 2.838 17.504 1.00 11.38 ATOM 52 O CYS A 8 8.835 2.293 18.556 1.00 10.79 ATOM 53 CB CYS A 8 7.626 3.062 15.521 1.00 10.79 ATOM 54 SG CYS A 8 6.939 1.392 15.771 1.00 10.53 ATOM 55 N ARG A 9 10.360 2.675 16.958 1.00 11.82 ATOM 56 CA ARG A 9 11.361 1.825 17.599 1.00 12.81 ATOM 57 C ARG A 9 11.747 2.335 18.983 1.00 12.34 ATOM 58 O ARG A 9 11.755 1.571 19.949 1.00 12.64 ATOM 59 CB ARG A 9 12.616 1.728 16.727 1.00 16.06 ATOM 60 CG ARG A 9 13.726 0.874 17.327 1.00 19.94 ATOM 61 CD ARG A 9 14.846 0.680 16.327 1.00 26.11 ATOM 62 NE ARG A 9 15.189 1.942 15.677 1.00 30.74 ATOM 63 CZ ARG A 9 16.106 2.072 14.725 1.00 33.75 ATOM 64 NH1 ARG A 9 16.786 1.014 14.304 1.00 35.96 ATOM 65 NH2 ARG A 9 16.337 3.262 14.188 1.00 35.14 ATOM 66 N VAL A 10 12.059 3.626 19.088 1.00 11.92 ATOM 67 CA VAL A 10 12.452 4.178 20.377 1.00 11.80 ATOM 68 C VAL A 10 11.336 4.072 21.408 1.00 11.10 ATOM 69 O VAL A 10 11.607 3.830 22.580 1.00 10.69 ATOM 70 CB VAL A 10 12.934 5.639 20.252 1.00 12.77 ATOM 71 CG1 VAL A 10 14.195 5.685 19.401 1.00 13.30 ATOM 72 CG2 VAL A 10 11.865 6.504 19.641 1.00 15.19 ATOM 73 N MLY A 11 10.086 4.246 20.979 1.00 9.85 ATOM 74 CA MLY A 11 8.954 4.125 21.904 1.00 10.06 ATOM 75 CB MLY A 11 7.676 4.648 21.249 1.00 10.70 ATOM 76 CG MLY A 11 7.612 6.162 21.230 1.00 12.72 ATOM 77 CD MLY A 11 6.478 6.679 20.376 1.00 13.18 ATOM 78 CE MLY A 11 6.355 8.191 20.512 1.00 16.00 ATOM 79 NZ MLY A 11 5.452 8.789 19.478 1.00 17.49 ATOM 80 CH1 MLY A 11 4.088 8.195 19.469 1.00 18.09 ATOM 81 CH2 MLY A 11 5.372 10.248 19.812 1.00 17.93 ATOM 82 C MLY A 11 8.766 2.668 22.338 1.00 10.07 ATOM 83 O MLY A 11 8.482 2.385 23.506 1.00 9.33 ATOM 84 N CYS A 12 8.925 1.748 21.394 1.00 10.03 ATOM 85 CA CYS A 12 8.796 0.329 21.699 1.00 10.26 ATOM 86 C CYS A 12 9.887 -0.077 22.675 1.00 10.17 ATOM 87 O CYS A 12 9.624 -0.756 23.667 1.00 10.21 ATOM 88 CB CYS A 12 8.932 -0.500 20.431 1.00 10.05 ATOM 89 SG CYS A 12 7.450 -0.488 19.384 1.00 10.89 ATOM 90 N VAL A 13 11.111 0.353 22.392 1.00 10.15 ATOM 91 CA VAL A 13 12.240 0.026 23.258 1.00 10.47 ATOM 92 C VAL A 13 12.073 0.636 24.651 1.00 10.79 ATOM 93 O VAL A 13 12.330 -0.032 25.652 1.00 10.54 ATOM 94 CB VAL A 13 13.582 0.489 22.625 1.00 10.32 ATOM 95 CG1 VAL A 13 14.713 0.418 23.644 1.00 11.28 ATOM 96 CG2 VAL A 13 13.922 -0.410 21.435 1.00 10.28 ATOM 97 N ALA A 14 11.627 1.890 24.712 1.00 11.31 ATOM 98 CA ALA A 14 11.430 2.578 25.989 1.00 11.89 ATOM 99 C ALA A 14 10.455 1.805 26.874 1.00 12.31 ATOM 100 O ALA A 14 10.589 1.801 28.099 1.00 13.39 ATOM 101 CB ALA A 14 10.908 3.989 25.752 1.00 11.80 ATOM 102 N MET A 15 9.480 1.159 26.239 1.00 12.31 ATOM 103 CA MET A 15 8.453 0.365 26.922 1.00 12.54 ATOM 104 C MET A 15 8.892 -1.030 27.341 1.00 11.94 ATOM 105 O MET A 15 8.131 -1.740 27.994 1.00 12.31 ATOM 106 CB MET A 15 7.261 0.149 26.008 1.00 13.89 ATOM 107 CG MET A 15 6.413 1.321 25.735 1.00 16.45 ATOM 108 SD MET A 15 5.162 0.665 24.662 1.00 16.72 ATOM 109 CE MET A 15 4.106 -0.165 25.795 1.00 15.36 ATOM 110 N GLY A 16 10.077 -1.450 26.920 1.00 11.04 ATOM 111 CA GLY A 16 10.542 -2.775 27.278 1.00 10.51 ATOM 112 C GLY A 16 10.597 -3.790 26.144 1.00 10.61 ATOM 113 O GLY A 16 10.974 -4.941 26.373 1.00 10.09 ATOM 114 N PHE A 17 10.205 -3.396 24.934 1.00 9.97 ATOM 115 CA PHE A 17 10.284 -4.318 23.799 1.00 10.43 ATOM 116 C PHE A 17 11.692 -4.217 23.220 1.00 10.68 ATOM 117 O PHE A 17 12.442 -3.312 23.577 1.00 11.82 ATOM 118 CB PHE A 17 9.240 -3.987 22.724 1.00 10.15 ATOM 119 CG PHE A 17 7.828 -4.289 23.138 1.00 11.00 ATOM 120 CD1 PHE A 17 7.086 -3.360 23.860 1.00 10.23 ATOM 121 CD2 PHE A 17 7.246 -5.521 22.831 1.00 11.03 ATOM 122 CE1 PHE A 17 5.789 -3.645 24.273 1.00 9.60 ATOM 123 CE2 PHE A 17 5.943 -5.817 23.244 1.00 10.42 ATOM 124 CZ PHE A 17 5.216 -4.872 23.968 1.00 10.04 ATOM 125 N SER A 18 12.050 -5.140 22.328 1.00 11.06 ATOM 126 CA SER A 18 13.389 -5.159 21.742 1.00 11.24 ATOM 127 C SER A 18 13.543 -4.266 20.515 1.00 11.75 ATOM 128 O SER A 18 14.644 -3.785 20.229 1.00 12.63 ATOM 129 CB SER A 18 13.784 -6.600 21.388 1.00 11.51 ATOM 130 OG SER A 18 13.879 -7.412 22.551 1.00 12.16 ATOM 131 N SER A 19 12.443 -4.053 19.791 1.00 11.28 ATOM 132 CA SER A 19 12.449 -3.203 18.605 1.00 10.12 ATOM 133 C SER A 19 11.023 -2.822 18.223 1.00 9.75 ATOM 134 O SER A 19 10.060 -3.228 18.874 1.00 8.84 ATOM 135 CB SER A 19 13.113 -3.925 17.432 1.00 11.10 ATOM 136 OG SER A 19 13.288 -3.043 16.336 1.00 12.63 ATOM 137 N GLY A 20 10.903 -2.037 17.163 1.00 9.20 ATOM 138 CA GLY A 20 9.601 -1.619 16.692 1.00 9.71 ATOM 139 C GLY A 20 9.725 -1.287 15.224 1.00 10.05 ATOM 140 O GLY A 20 10.788 -0.862 14.773 1.00 10.71 ATOM 141 N MLY A 21 8.654 -1.508 14.471 1.00 10.98 ATOM 142 CA MLY A 21 8.650 -1.220 13.043 1.00 11.58 ATOM 143 CB MLY A 21 8.880 -2.493 12.222 1.00 13.29 ATOM 144 CG MLY A 21 10.062 -3.329 12.638 1.00 17.43 ATOM 145 CD MLY A 21 9.946 -4.718 12.037 1.00 19.05 ATOM 146 CE MLY A 21 11.011 -5.642 12.587 1.00 22.88 ATOM 147 NZ MLY A 21 10.741 -7.070 12.255 1.00 24.14 ATOM 148 CH1 MLY A 21 10.615 -7.254 10.782 1.00 24.50 ATOM 149 CH2 MLY A 21 11.947 -7.789 12.761 1.00 24.36 ATOM 150 C MLY A 21 7.287 -0.684 12.651 1.00 11.56 ATOM 151 O MLY A 21 6.282 -1.014 13.277 1.00 11.10 ATOM 152 N CYS A 22 7.251 0.146 11.615 1.00 10.23 ATOM 153 CA CYS A 22 5.977 0.645 11.132 1.00 10.76 ATOM 154 C CYS A 22 5.502 -0.347 10.078 1.00 10.71 ATOM 155 O CYS A 22 6.245 -0.679 9.155 1.00 11.65 ATOM 156 CB CYS A 22 6.131 2.015 10.472 1.00 11.72 ATOM 157 SG CYS A 22 6.535 3.354 11.620 1.00 12.25 ATOM 158 N ILE A 23 4.275 -0.832 10.222 1.00 10.96 ATOM 159 CA ILE A 23 3.717 -1.758 9.239 1.00 11.65 ATOM 160 C ILE A 23 2.420 -1.131 8.738 1.00 11.77 ATOM 161 O ILE A 23 1.467 -0.978 9.497 1.00 11.22 ATOM 162 CB ILE A 23 3.433 -3.128 9.867 1.00 11.89 ATOM 163 CG1 ILE A 23 4.741 -3.723 10.395 1.00 12.46 ATOM 164 CG2 ILE A 23 2.792 -4.046 8.837 1.00 11.89 ATOM 165 CD1 ILE A 23 4.595 -5.112 10.969 1.00 13.40 ATOM 166 N ASN A 24 2.386 -0.768 7.458 1.00 12.27 ATOM 167 CA ASN A 24 1.208 -0.115 6.894 1.00 13.49 ATOM 168 C ASN A 24 0.737 1.038 7.787 1.00 14.79 ATOM 169 O ASN A 24 -0.451 1.178 8.110 1.00 14.81 ATOM 170 CB ASN A 24 0.089 -1.139 6.660 1.00 13.90 ATOM 171 CG ASN A 24 0.241 -1.855 5.333 1.00 14.62 ATOM 172 OD1 ASN A 24 1.248 -1.685 4.639 1.00 14.53 ATOM 173 ND2 ASN A 24 -0.755 -2.656 4.969 1.00 14.22 ATOM 174 N SER A 25 1.706 1.854 8.190 1.00 15.13 ATOM 175 CA SER A 25 1.466 3.030 9.015 1.00 16.73 ATOM 176 C SER A 25 1.045 2.770 10.462 1.00 16.89 ATOM 177 O SER A 25 0.488 3.655 11.109 1.00 17.16 ATOM 178 CB SER A 25 0.436 3.931 8.326 1.00 18.20 ATOM 179 OG SER A 25 0.849 4.240 7.003 1.00 21.37 ATOM 180 N MLY A 26 1.307 1.568 10.970 1.00 16.25 ATOM 181 CA MLY A 26 0.971 1.236 12.352 1.00 16.92 ATOM 182 CB MLY A 26 -0.108 0.150 12.413 1.00 19.98 ATOM 183 CG MLY A 26 -1.424 0.512 11.739 1.00 24.48 ATOM 184 CD MLY A 26 -2.420 -0.633 11.867 1.00 28.30 ATOM 185 CE MLY A 26 -3.646 -0.458 10.972 1.00 31.51 ATOM 186 NZ MLY A 26 -4.608 0.592 11.425 1.00 34.29 ATOM 187 CH1 MLY A 26 -4.185 2.025 11.417 1.00 34.72 ATOM 188 CH2 MLY A 26 -5.800 0.485 10.531 1.00 34.47 ATOM 189 C MLY A 26 2.217 0.740 13.080 1.00 15.66 ATOM 190 O MLY A 26 2.895 -0.174 12.612 1.00 15.15 ATOM 191 N CYS A 27 2.510 1.335 14.229 1.00 14.54 ATOM 192 CA CYS A 27 3.673 0.941 15.007 1.00 12.56 ATOM 193 C CYS A 27 3.470 -0.401 15.684 1.00 12.93 ATOM 194 O CYS A 27 2.536 -0.581 16.474 1.00 13.40 ATOM 195 CB CYS A 27 3.994 2.007 16.063 1.00 11.51 ATOM 196 SG CYS A 27 5.428 1.608 17.110 1.00 11.30 ATOM 197 N MLY A 28 4.343 -1.349 15.361 1.00 12.68 ATOM 198 CA MLY A 28 4.285 -2.678 15.954 1.00 13.12 ATOM 199 CB MLY A 28 4.076 -3.736 14.872 1.00 14.68 ATOM 200 CG MLY A 28 4.023 -5.144 15.426 1.00 18.89 ATOM 201 CD MLY A 28 3.774 -6.159 14.333 1.00 21.34 ATOM 202 CE MLY A 28 3.346 -7.489 14.933 1.00 24.67 ATOM 203 NZ MLY A 28 3.071 -8.523 13.906 1.00 26.75 ATOM 204 CH1 MLY A 28 2.051 -8.038 12.925 1.00 28.03 ATOM 205 CH2 MLY A 28 4.337 -8.806 13.184 1.00 28.18 ATOM 206 C MLY A 28 5.591 -2.958 16.692 1.00 12.79 ATOM 207 O MLY A 28 6.673 -2.794 16.137 1.00 12.06 ATOM 208 N CYS A 29 5.495 -3.371 17.950 1.00 12.70 ATOM 209 CA CYS A 29 6.696 -3.668 18.721 1.00 12.55 ATOM 210 C CYS A 29 7.029 -5.154 18.659 1.00 13.78 ATOM 211 O CYS A 29 6.139 -5.980 18.449 1.00 14.87 ATOM 212 CB CYS A 29 6.503 -3.271 20.180 1.00 11.62 ATOM 213 SG CYS A 29 6.089 -1.529 20.483 1.00 10.22 ATOM 214 N TYR A 30 8.305 -5.482 18.853 1.00 13.94 ATOM 215 CA TYR A 30 8.774 -6.867 18.834 1.00 14.11 ATOM 216 C TYR A 30 9.634 -7.222 20.043 1.00 13.66 ATOM 217 O TYR A 30 10.339 -6.377 20.580 1.00 13.11 ATOM 218 CB TYR A 30 9.600 -7.141 17.572 1.00 14.50 ATOM 219 CG TYR A 30 8.802 -7.101 16.293 1.00 17.02 ATOM 220 CD1 TYR A 30 8.365 -5.892 15.758 1.00 17.48 ATOM 221 CD2 TYR A 30 8.467 -8.276 15.624 1.00 18.07 ATOM 222 CE1 TYR A 30 7.615 -5.852 14.594 1.00 18.71 ATOM 223 CE2 TYR A 30 7.711 -8.246 14.455 1.00 19.80 ATOM 224 CZ TYR A 30 7.291 -7.031 13.945 1.00 19.78 ATOM 225 OH TYR A 30 6.549 -6.996 12.780 1.00 21.97 ATOM 226 N MLY A 31 9.584 -8.484 20.461 1.00 14.04 ATOM 227 CA MLY A 31 10.399 -8.937 21.582 1.00 15.92 ATOM 228 CB MLY A 31 9.791 -8.501 22.927 1.00 16.20 ATOM 229 CG MLY A 31 8.611 -9.324 23.420 1.00 16.76 ATOM 230 CD MLY A 31 7.920 -8.658 24.620 1.00 16.45 ATOM 231 CE MLY A 31 8.900 -8.363 25.744 1.00 17.01 ATOM 232 NZ MLY A 31 8.262 -7.759 26.943 1.00 16.55 ATOM 233 CH1 MLY A 31 9.369 -7.558 27.919 1.00 17.53 ATOM 234 CH2 MLY A 31 7.594 -6.442 26.713 1.00 16.65 ATOM 235 C MLY A 31 10.561 -10.455 21.527 1.00 16.94 ATOM 236 O MLY A 31 11.553 -10.962 22.095 1.00 17.88 ATOM 237 OXT MLY A 31 9.693 -11.114 20.912 1.00 16.71 TER