HEADER SIGNALING PROTEIN 31-DEC-69 7XMR TITLE CryoEM structure of the somatostatin receptor 2 (SSTR2) in complex TITLE 2 with Gi1 and its endogeneous peptide ligand SST-14 COMPND MOL_ID: 4; COMPND 2 MOLECULE: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit COMPND 3 gamma-2; COMPND 4 CHAIN: C; COMPND 5 ENGINEERED: YES; EXPDTA ELECTRON MICROSCOPY DBREF 7XMR C 1 71 UNP P59768 GBG2_HUMAN 1 71 SEQRES 1 C 34 ILE LYS VAL SER LYS ALA ALA ALA ASP LEU MET ALA TYR SEQRES 2 C 34 CYS GLU ALA HIS ALA LYS GLU ASP PRO LEU LEU THR PRO SEQRES 3 C 34 VAL PRO ALA SER GLU ASN PRO PHE ATOM 1 N ILE C 28 71.442 160.467 133.891 1.00 79.61 ATOM 2 CA ILE C 28 71.625 159.024 133.823 1.00 79.61 ATOM 3 C ILE C 28 72.087 158.491 135.175 1.00 79.61 ATOM 4 O ILE C 28 73.064 158.978 135.744 1.00 79.61 ATOM 5 CB ILE C 28 72.617 158.641 132.712 1.00 79.61 ATOM 6 CG1 ILE C 28 72.119 159.152 131.358 1.00 79.61 ATOM 7 CG2 ILE C 28 72.821 157.134 132.673 1.00 79.61 ATOM 8 CD1 ILE C 28 73.019 158.791 130.197 1.00 79.61 ATOM 9 N LYS C 29 71.374 157.490 135.684 1.00 81.26 ATOM 10 CA LYS C 29 71.701 156.920 136.984 1.00 81.26 ATOM 11 C LYS C 29 73.014 156.150 136.922 1.00 81.26 ATOM 12 O LYS C 29 73.341 155.525 135.909 1.00 81.26 ATOM 13 CB LYS C 29 70.576 156.000 137.456 1.00 81.26 ATOM 14 CG LYS C 29 69.451 156.717 138.187 1.00 81.26 ATOM 15 CD LYS C 29 69.896 157.199 139.559 1.00 81.26 ATOM 16 CE LYS C 29 70.523 156.073 140.367 1.00 81.26 ATOM 17 NZ LYS C 29 69.592 154.922 140.531 1.00 81.26 ATOM 18 N VAL C 30 73.772 156.201 138.020 1.00 82.29 ATOM 19 CA VAL C 30 75.032 155.468 138.083 1.00 82.29 ATOM 20 C VAL C 30 74.779 153.967 138.153 1.00 82.29 ATOM 21 O VAL C 30 75.579 153.170 137.647 1.00 82.29 ATOM 22 CB VAL C 30 75.877 155.967 139.272 1.00 82.29 ATOM 23 CG1 VAL C 30 75.122 155.794 140.584 1.00 82.29 ATOM 24 CG2 VAL C 30 77.224 155.256 139.318 1.00 82.29 ATOM 25 N SER C 31 73.665 153.553 138.763 1.00 84.69 ATOM 26 CA SER C 31 73.346 152.131 138.833 1.00 84.69 ATOM 27 C SER C 31 73.007 151.572 137.457 1.00 84.69 ATOM 28 O SER C 31 73.255 150.392 137.181 1.00 84.69 ATOM 29 CB SER C 31 72.190 151.899 139.807 1.00 84.69 ATOM 30 OG SER C 31 70.939 152.037 139.156 1.00 84.69 ATOM 31 N LYS C 32 72.438 152.403 136.580 1.00 83.45 ATOM 32 CA LYS C 32 72.139 151.953 135.225 1.00 83.45 ATOM 33 C LYS C 32 73.418 151.734 134.427 1.00 83.45 ATOM 34 O LYS C 32 73.537 150.750 133.686 1.00 83.45 ATOM 35 CB LYS C 32 71.232 152.966 134.525 1.00 83.45 ATOM 36 CG LYS C 32 71.099 152.757 133.024 1.00 83.45 ATOM 37 CD LYS C 32 70.405 151.442 132.708 1.00 83.45 ATOM 38 CE LYS C 32 69.882 151.422 131.281 1.00 83.45 ATOM 39 NZ LYS C 32 70.983 151.276 130.289 1.00 83.45 ATOM 40 N ALA C 33 74.390 152.639 134.568 1.00 81.79 ATOM 41 CA ALA C 33 75.668 152.462 133.887 1.00 81.79 ATOM 42 C ALA C 33 76.435 151.274 134.454 1.00 81.79 ATOM 43 O ALA C 33 77.147 150.580 133.720 1.00 81.79 ATOM 44 CB ALA C 33 76.500 153.740 133.990 1.00 81.79 ATOM 45 N ALA C 34 76.305 151.028 135.760 1.00 82.67 ATOM 46 CA ALA C 34 76.956 149.869 136.360 1.00 82.67 ATOM 47 C ALA C 34 76.334 148.571 135.861 1.00 82.67 ATOM 48 O ALA C 34 77.045 147.598 135.585 1.00 82.67 ATOM 49 CB ALA C 34 76.880 149.953 137.884 1.00 82.67 ATOM 50 N ALA C 35 75.004 148.537 135.742 1.00 81.27 ATOM 51 CA ALA C 35 74.342 147.354 135.201 1.00 81.27 ATOM 52 C ALA C 35 74.656 147.175 133.721 1.00 81.27 ATOM 53 O ALA C 35 74.729 146.044 133.228 1.00 81.27 ATOM 54 CB ALA C 35 72.833 147.446 135.425 1.00 81.27 ATOM 55 N ASP C 36 74.839 148.282 132.996 1.00 79.46 ATOM 56 CA ASP C 36 75.199 148.188 131.586 1.00 79.46 ATOM 57 C ASP C 36 76.609 147.631 131.425 1.00 79.46 ATOM 58 O ASP C 36 76.865 146.810 130.536 1.00 79.46 ATOM 59 CB ASP C 36 75.074 149.567 130.929 1.00 79.46 ATOM 60 CG ASP C 36 75.412 149.557 129.445 1.00 79.46 ATOM 61 OD1 ASP C 36 75.540 148.465 128.851 1.00 79.46 ATOM 62 OD2 ASP C 36 75.546 150.655 128.865 1.00 79.46 ATOM 63 N LEU C 37 77.534 148.053 132.291 1.00 75.93 ATOM 64 CA LEU C 37 78.900 147.546 132.220 1.00 75.93 ATOM 65 C LEU C 37 78.960 146.068 132.585 1.00 75.93 ATOM 66 O LEU C 37 79.721 145.301 131.983 1.00 75.93 ATOM 67 CB LEU C 37 79.810 148.362 133.137 1.00 75.93 ATOM 68 CG LEU C 37 81.307 148.308 132.830 1.00 75.93 ATOM 69 CD1 LEU C 37 81.597 148.970 131.493 1.00 75.93 ATOM 70 CD2 LEU C 37 82.106 148.964 133.944 1.00 75.93 ATOM 71 N MET C 38 78.167 145.649 133.575 1.00 80.43 ATOM 72 CA MET C 38 78.147 144.242 133.960 1.00 80.43 ATOM 73 C MET C 38 77.507 143.384 132.877 1.00 80.43 ATOM 74 O MET C 38 77.956 142.261 132.616 1.00 80.43 ATOM 75 CB MET C 38 77.407 144.072 135.288 1.00 80.43 ATOM 76 CG MET C 38 77.320 142.633 135.772 1.00 80.43 ATOM 77 SD MET C 38 76.284 142.448 137.236 1.00 80.43 ATOM 78 CE MET C 38 77.145 143.507 138.396 1.00 80.43 ATOM 79 N ALA C 39 76.454 143.895 132.234 1.00 76.14 ATOM 80 CA ALA C 39 75.797 143.137 131.174 1.00 76.14 ATOM 81 C ALA C 39 76.707 142.975 129.963 1.00 76.14 ATOM 82 O ALA C 39 76.748 141.902 129.351 1.00 76.14 ATOM 83 CB ALA C 39 74.487 143.817 130.776 1.00 76.14 ATOM 84 N TYR C 40 77.441 144.030 129.601 1.00 71.44 ATOM 85 CA TYR C 40 78.362 143.934 128.474 1.00 71.44 ATOM 86 C TYR C 40 79.548 143.034 128.794 1.00 71.44 ATOM 87 O TYR C 40 80.071 142.358 127.900 1.00 71.44 ATOM 88 CB TYR C 40 78.845 145.327 128.069 1.00 71.44 ATOM 89 CG TYR C 40 79.863 145.325 126.949 1.00 71.44 ATOM 90 CD1 TYR C 40 79.465 145.226 125.623 1.00 71.44 ATOM 91 CD2 TYR C 40 81.223 145.425 127.219 1.00 71.44 ATOM 92 CE1 TYR C 40 80.391 145.224 124.596 1.00 71.44 ATOM 93 CE2 TYR C 40 82.156 145.423 126.199 1.00 71.44 ATOM 94 CZ TYR C 40 81.734 145.323 124.890 1.00 71.44 ATOM 95 OH TYR C 40 82.660 145.321 123.872 1.00 71.44 ATOM 96 N CYS C 41 79.986 143.011 130.055 1.00 73.69 ATOM 97 CA CYS C 41 81.113 142.163 130.428 1.00 73.69 ATOM 98 C CYS C 41 80.717 140.692 130.444 1.00 73.69 ATOM 99 O CYS C 41 81.532 139.820 130.119 1.00 73.69 ATOM 100 CB CYS C 41 81.661 142.589 131.789 1.00 73.69 ATOM 101 SG CYS C 41 83.391 142.149 132.069 1.00 73.69 ATOM 102 N GLU C 42 79.471 140.395 130.819 1.00 74.96 ATOM 103 CA GLU C 42 79.001 139.016 130.846 1.00 74.96 ATOM 104 C GLU C 42 78.582 138.512 129.472 1.00 74.96 ATOM 105 O GLU C 42 78.696 137.310 129.208 1.00 74.96 ATOM 106 CB GLU C 42 77.832 138.877 131.825 1.00 74.96 ATOM 107 CG GLU C 42 78.216 139.029 133.291 1.00 74.96 ATOM 108 CD GLU C 42 79.473 138.260 133.655 1.00 74.96 ATOM 109 OE1 GLU C 42 79.363 137.057 133.972 1.00 74.96 ATOM 110 OE2 GLU C 42 80.569 138.861 133.636 1.00 74.96 ATOM 111 N ALA C 43 78.102 139.396 128.596 1.00 72.93 ATOM 112 CA ALA C 43 77.721 138.980 127.250 1.00 72.93 ATOM 113 C ALA C 43 78.949 138.742 126.379 1.00 72.93 ATOM 114 O ALA C 43 79.022 137.742 125.656 1.00 72.93 ATOM 115 CB ALA C 43 76.805 140.028 126.616 1.00 72.93 ATOM 116 N HIS C 44 79.921 139.650 126.437 1.00 73.93 ATOM 117 CA HIS C 44 81.174 139.512 125.694 1.00 73.93 ATOM 118 C HIS C 44 82.207 138.902 126.631 1.00 73.93 ATOM 119 O HIS C 44 82.877 139.598 127.394 1.00 73.93 ATOM 120 CB HIS C 44 81.632 140.858 125.147 1.00 73.93 ATOM 121 CG HIS C 44 80.895 141.295 123.919 1.00 73.93 ATOM 122 ND1 HIS C 44 81.384 141.092 122.646 1.00 73.93 ATOM 123 CD2 HIS C 44 79.705 141.924 123.768 1.00 73.93 ATOM 124 CE1 HIS C 44 80.528 141.578 121.765 1.00 73.93 ATOM 125 NE2 HIS C 44 79.501 142.088 122.419 1.00 73.93 ATOM 126 N ALA C 45 82.331 137.576 126.580 1.00 76.66 ATOM 127 CA ALA C 45 83.276 136.854 127.419 1.00 76.66 ATOM 128 C ALA C 45 84.164 135.897 126.638 1.00 76.66 ATOM 129 O ALA C 45 84.924 135.141 127.255 1.00 76.66 ATOM 130 CB ALA C 45 82.531 136.081 128.516 1.00 76.66 ATOM 131 N LYS C 46 84.099 135.908 125.307 1.00 75.02 ATOM 132 CA LYS C 46 84.894 134.998 124.480 1.00 75.02 ATOM 133 C LYS C 46 86.279 135.607 124.282 1.00 75.02 ATOM 134 O LYS C 46 86.640 136.098 123.209 1.00 75.02 ATOM 135 CB LYS C 46 84.197 134.729 123.152 1.00 75.02 ATOM 136 CG LYS C 46 82.705 134.446 123.270 1.00 75.02 ATOM 137 CD LYS C 46 82.421 133.349 124.287 1.00 75.02 ATOM 138 CE LYS C 46 80.978 133.397 124.762 1.00 75.02 ATOM 139 NZ LYS C 46 80.770 132.562 125.977 1.00 75.02 ATOM 140 N GLU C 47 87.071 135.568 125.351 1.00 73.04 ATOM 141 CA GLU C 47 88.420 136.110 125.346 1.00 73.04 ATOM 142 C GLU C 47 89.380 135.100 125.961 1.00 73.04 ATOM 143 O GLU C 47 88.983 134.213 126.720 1.00 73.04 ATOM 144 CB GLU C 47 88.496 137.442 126.106 1.00 73.04 ATOM 145 CG GLU C 47 87.860 137.407 127.485 1.00 73.04 ATOM 146 CD GLU C 47 87.842 138.767 128.152 1.00 73.04 ATOM 147 OE1 GLU C 47 88.322 139.741 127.534 1.00 73.04 ATOM 148 OE2 GLU C 47 87.347 138.864 129.295 1.00 73.04 ATOM 149 N ASP C 48 90.656 135.249 125.617 1.00 75.01 ATOM 150 CA ASP C 48 91.706 134.344 126.073 1.00 75.01 ATOM 151 C ASP C 48 92.135 134.611 127.517 1.00 75.01 ATOM 152 O ASP C 48 92.176 133.667 128.315 1.00 75.01 ATOM 153 CB ASP C 48 92.916 134.424 125.136 1.00 75.01 ATOM 154 CG ASP C 48 93.952 133.353 125.425 1.00 75.01 ATOM 155 OD1 ASP C 48 94.064 132.404 124.621 1.00 75.01 ATOM 156 OD2 ASP C 48 94.659 133.461 126.449 1.00 75.01 ATOM 157 N PRO C 49 92.472 135.850 127.904 1.00 72.25 ATOM 158 CA PRO C 49 93.043 136.044 129.251 1.00 72.25 ATOM 159 C PRO C 49 92.102 135.675 130.385 1.00 72.25 ATOM 160 O PRO C 49 92.572 135.379 131.491 1.00 72.25 ATOM 161 CB PRO C 49 93.388 137.541 129.275 1.00 72.25 ATOM 162 CG PRO C 49 93.457 137.947 127.847 1.00 72.25 ATOM 163 CD PRO C 49 92.415 137.126 127.168 1.00 72.25 ATOM 164 N LEU C 50 90.789 135.676 130.153 1.00 75.50 ATOM 165 CA LEU C 50 89.850 135.430 131.242 1.00 75.50 ATOM 166 C LEU C 50 89.702 133.938 131.529 1.00 75.50 ATOM 167 O LEU C 50 90.030 133.471 132.625 1.00 75.50 ATOM 168 CB LEU C 50 88.492 136.058 130.916 1.00 75.50 ATOM 169 CG LEU C 50 87.396 135.849 131.960 1.00 75.50 ATOM 170 CD1 LEU C 50 87.848 136.373 133.315 1.00 75.50 ATOM 171 CD2 LEU C 50 86.108 136.529 131.525 1.00 75.50 ATOM 172 N LEU C 51 89.209 133.174 130.555 1.00 86.51 ATOM 173 CA LEU C 51 89.006 131.741 130.734 1.00 86.51 ATOM 174 C LEU C 51 90.065 130.887 130.054 1.00 86.51 ATOM 175 O LEU C 51 90.394 129.811 130.566 1.00 86.51 ATOM 176 CB LEU C 51 87.623 131.322 130.217 1.00 86.51 ATOM 177 CG LEU C 51 86.407 132.124 130.691 1.00 86.51 ATOM 178 CD1 LEU C 51 86.021 133.195 129.681 1.00 86.51 ATOM 179 CD2 LEU C 51 85.231 131.203 130.974 1.00 86.51 ATOM 180 N THR C 52 90.604 131.341 128.919 1.00 86.99 ATOM 181 CA THR C 52 91.570 130.597 128.115 1.00 86.99 ATOM 182 C THR C 52 91.008 129.222 127.769 1.00 86.99 ATOM 183 O THR C 52 91.394 128.217 128.381 1.00 86.99 ATOM 184 CB THR C 52 92.910 130.475 128.848 1.00 86.99 ATOM 185 OG1 THR C 52 93.374 131.781 129.208 1.00 86.99 ATOM 186 CG2 THR C 52 93.955 129.828 127.948 1.00 86.99 ATOM 187 N PRO C 53 90.066 129.139 126.825 1.00 94.56 ATOM 188 CA PRO C 53 89.529 127.836 126.421 1.00 94.56 ATOM 189 C PRO C 53 90.262 127.182 125.261 1.00 94.56 ATOM 190 O PRO C 53 89.986 126.011 124.964 1.00 94.56 ATOM 191 CB PRO C 53 88.089 128.186 126.022 1.00 94.56 ATOM 192 CG PRO C 53 88.205 129.568 125.451 1.00 94.56 ATOM 193 CD PRO C 53 89.372 130.249 126.148 1.00 94.56 ATOM 194 N VAL C 54 91.173 127.892 124.604 1.00 94.55 ATOM 195 CA VAL C 54 91.902 127.358 123.455 1.00 94.55 ATOM 196 C VAL C 54 93.064 126.507 123.953 1.00 94.55 ATOM 197 O VAL C 54 93.640 126.802 125.011 1.00 94.55 ATOM 198 CB VAL C 54 92.394 128.487 122.536 1.00 94.55 ATOM 199 CG1 VAL C 54 91.226 129.099 121.778 1.00 94.55 ATOM 200 CG2 VAL C 54 93.127 129.548 123.341 1.00 94.55 ATOM 201 N PRO C 55 93.440 125.452 123.241 1.00 94.02 ATOM 202 CA PRO C 55 94.576 124.626 123.657 1.00 94.02 ATOM 203 C PRO C 55 95.896 125.299 123.290 1.00 94.02 ATOM 204 O PRO C 55 95.936 126.417 122.778 1.00 94.02 ATOM 205 CB PRO C 55 94.367 123.330 122.873 1.00 94.02 ATOM 206 CG PRO C 55 93.657 123.762 121.638 1.00 94.02 ATOM 207 CD PRO C 55 92.780 124.922 122.034 1.00 94.02 ATOM 208 N ALA C 56 96.990 124.588 123.564 1.00 91.77 ATOM 209 CA ALA C 56 98.321 125.103 123.268 1.00 91.77 ATOM 210 C ALA C 56 98.660 125.052 121.784 1.00 91.77 ATOM 211 O ALA C 56 99.691 125.604 121.385 1.00 91.77 ATOM 212 CB ALA C 56 99.373 124.329 124.064 1.00 91.77 ATOM 213 N SER C 57 97.829 124.410 120.964 1.00 91.85 ATOM 214 CA SER C 57 98.091 124.313 119.534 1.00 91.85 ATOM 215 C SER C 57 97.335 125.355 118.723 1.00 91.85 ATOM 216 O SER C 57 97.786 125.725 117.632 1.00 91.85 ATOM 217 CB SER C 57 97.731 122.914 119.026 1.00 91.85 ATOM 218 OG SER C 57 96.338 122.676 119.131 1.00 91.85 ATOM 219 N GLU C 58 96.196 125.836 119.226 1.00 92.38 ATOM 220 CA GLU C 58 95.414 126.817 118.480 1.00 92.38 ATOM 221 C GLU C 58 96.090 128.183 118.490 1.00 92.38 ATOM 222 O GLU C 58 96.175 128.852 117.454 1.00 92.38 ATOM 223 CB GLU C 58 94.001 126.907 119.056 1.00 92.38 ATOM 224 CG GLU C 58 93.050 127.768 118.241 1.00 92.38 ATOM 225 CD GLU C 58 91.599 127.559 118.626 1.00 92.38 ATOM 226 OE1 GLU C 58 90.724 128.233 118.044 1.00 92.38 ATOM 227 OE2 GLU C 58 91.334 126.717 119.511 1.00 92.38 ATOM 228 N ASN C 59 96.574 128.613 119.650 1.00 83.94 ATOM 229 CA ASN C 59 97.246 129.900 119.736 1.00 83.94 ATOM 230 C ASN C 59 98.626 129.820 119.085 1.00 83.94 ATOM 231 O ASN C 59 99.348 128.836 119.275 1.00 83.94 ATOM 232 CB ASN C 59 97.372 130.347 121.193 1.00 83.94 ATOM 233 CG ASN C 59 97.867 129.240 122.105 1.00 83.94 ATOM 234 OD1 ASN C 59 98.135 128.124 121.661 1.00 83.94 ATOM 235 ND2 ASN C 59 97.989 129.546 123.391 1.00 83.94 ATOM 236 N PRO C 60 99.017 130.833 118.306 1.00 73.14 ATOM 237 CA PRO C 60 100.337 130.796 117.654 1.00 73.14 ATOM 238 C PRO C 60 101.504 130.924 118.619 1.00 73.14 ATOM 239 O PRO C 60 102.648 130.693 118.206 1.00 73.14 ATOM 240 CB PRO C 60 100.288 131.989 116.687 1.00 73.14 ATOM 241 CG PRO C 60 98.833 132.357 116.578 1.00 73.14 ATOM 242 CD PRO C 60 98.234 132.009 117.900 1.00 73.14 ATOM 243 N PHE C 61 101.260 131.280 119.876 1.00 64.31 ATOM 244 CA PHE C 61 102.332 131.423 120.854 1.00 64.31 ATOM 245 C PHE C 61 102.593 130.105 121.577 1.00 64.31 ATOM 246 O PHE C 61 103.743 129.710 121.771 1.00 64.31 ATOM 247 CB PHE C 61 101.993 132.520 121.865 1.00 64.31 ATOM 248 CG PHE C 61 101.714 133.856 121.238 1.00 64.31 ATOM 249 CD1 PHE C 61 102.749 134.729 120.949 1.00 64.31 ATOM 250 CD2 PHE C 61 100.417 134.239 120.938 1.00 64.31 ATOM 251 CE1 PHE C 61 102.496 135.959 120.372 1.00 64.31 ATOM 252 CE2 PHE C 61 100.158 135.467 120.360 1.00 64.31 ATOM 253 CZ PHE C 61 101.199 136.329 120.078 1.00 64.31 TER