0.018795 0.000000 0.000000 0.000000 0.017976 0.000000 0.000000 0.000000 0.009799 0.000000 0.000000 0.000000 Goulding, C.W. Sawaya, M.R. Parseghian, A. http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic 8 90.00 90.00 90.00 53.206 55.630 102.052 C3 H7 N O2 89.093 y ALANINE L-peptide linking C6 H15 N4 O2 1 175.209 y ARGININE L-peptide linking C4 H8 N2 O3 132.118 y ASPARAGINE L-peptide linking C4 H7 N O4 133.103 y ASPARTIC ACID L-peptide linking C3 H7 N O2 S 121.158 y CYSTEINE L-peptide linking C5 H10 N2 O3 146.144 y GLUTAMINE L-peptide linking C5 H9 N O4 147.129 y GLUTAMIC ACID L-peptide linking C2 H5 N O2 75.067 y GLYCINE peptide linking C6 H10 N3 O2 1 156.162 y HISTIDINE L-peptide linking H2 O 18.015 WATER non-polymer C6 H13 N O2 131.173 y ISOLEUCINE L-peptide linking C6 H13 N O2 131.173 y LEUCINE L-peptide linking C6 H15 N2 O2 1 147.195 y LYSINE L-peptide linking C9 H11 N O2 165.189 y PHENYLALANINE L-peptide linking C5 H9 N O2 115.130 y PROLINE L-peptide linking C3 H7 N O3 105.093 y SERINE L-peptide linking C4 H9 N O3 119.119 y THREONINE L-peptide linking C11 H12 N2 O2 204.225 y TRYPTOPHAN L-peptide linking C9 H11 N O3 181.189 y TYROSINE L-peptide linking C5 H11 N O2 117.146 y VALINE L-peptide linking US Biochemistry BICHAW 0033 0006-2960 41 6920 6927 10.1021/bi016038l 12033924 Thiol-disulfide exchange in an immunoglobulin-like fold: structure of the N-terminal domain of DsbD. 2002 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 110 1 OSMIC MIRRORS IMAGE PLATE 2001-07-01 RIGAKU RAXIS IV++ SINGLE WAVELENGTH M x-ray 1 1.5418 1.0 1.5418 1.5418 ROTATING ANODE RIGAKU FR-D 14126.689 Thiol:disulfide interchange protein dsbD Residues 20-143 1 man polymer 18.015 water 245 nat water C-type cytochrome biogenesis protein cycZ, Inner membrane copper tolerance protein no no GLFDAPGRSQFVPADQAFAFDFQQNQHDLNLTWQIKDGYYLYRKQIRITPEHAKIADVQLPQGVWHEDEFYGKSEIYRDR LTLPVTINQASAGATLTVTYQGCADAGFCYPPETKTVPLSEVVAN GLFDAPGRSQFVPADQAFAFDFQQNQHDLNLTWQIKDGYYLYRKQIRITPEHAKIADVQLPQGVWHEDEFYGKSEIYRDR LTLPVTINQASAGATLTVTYQGCADAGFCYPPETKTVPLSEVVAN A polypeptide(L) n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n Escherichia Escherichia Escherichia coli sample 562 Escherichia coli DH5alpha cells 83333 Escherichia coli K12 K12 pGEX-2T PLASMID 1 2.40 48.8 VAPOR DIFFUSION, HANGING DROP 4.6 PEG 4000, sodium actetate, ammonium sulfate, pH 4.6, VAPOR DIFFUSION, HANGING DROP, temperature 300K 300 repository Initial release Version format compliance Version format compliance 1 0 2002-06-12 1 1 2008-04-28 1 2 2011-07-13 Crystal structure of DsbD-alpha; the N-terminal domain of DsbD RCSB Y RCSB 2002-03-12 REL REL HOH water HOH 1 2 HOH HOH 126 A HOH 2 2 HOH HOH 127 A HOH 3 2 HOH HOH 128 A HOH 4 2 HOH HOH 129 A HOH 5 2 HOH HOH 130 A HOH 6 2 HOH HOH 131 A HOH 7 2 HOH HOH 132 A HOH 8 2 HOH HOH 133 A HOH 9 2 HOH HOH 134 A HOH 10 2 HOH HOH 135 A HOH 11 2 HOH HOH 136 A HOH 12 2 HOH HOH 137 A HOH 13 2 HOH HOH 138 A HOH 14 2 HOH HOH 139 A HOH 15 2 HOH HOH 140 A HOH 16 2 HOH HOH 141 A HOH 17 2 HOH HOH 142 A HOH 18 2 HOH HOH 143 A HOH 19 2 HOH HOH 144 A HOH 20 2 HOH HOH 145 A HOH 21 2 HOH HOH 146 A HOH 22 2 HOH HOH 147 A HOH 23 2 HOH HOH 148 A HOH 24 2 HOH HOH 149 A HOH 25 2 HOH HOH 150 A HOH 26 2 HOH HOH 151 A HOH 27 2 HOH HOH 152 A HOH 28 2 HOH HOH 153 A HOH 29 2 HOH HOH 154 A HOH 30 2 HOH HOH 155 A HOH 31 2 HOH HOH 156 A HOH 32 2 HOH HOH 157 A HOH 33 2 HOH HOH 158 A HOH 34 2 HOH HOH 159 A HOH 35 2 HOH HOH 160 A HOH 36 2 HOH HOH 161 A HOH 37 2 HOH HOH 162 A HOH 38 2 HOH HOH 163 A HOH 39 2 HOH HOH 164 A HOH 40 2 HOH HOH 165 A HOH 41 2 HOH HOH 166 A HOH 42 2 HOH HOH 167 A HOH 43 2 HOH HOH 168 A HOH 44 2 HOH HOH 169 A HOH 45 2 HOH HOH 170 A HOH 46 2 HOH HOH 171 A HOH 47 2 HOH HOH 172 A HOH 48 2 HOH HOH 173 A HOH 49 2 HOH HOH 174 A HOH 50 2 HOH HOH 175 A HOH 51 2 HOH HOH 176 A HOH 52 2 HOH HOH 177 A HOH 53 2 HOH HOH 178 A HOH 54 2 HOH HOH 179 A HOH 55 2 HOH HOH 180 A HOH 56 2 HOH HOH 181 A HOH 57 2 HOH HOH 182 A HOH 58 2 HOH HOH 183 A HOH 59 2 HOH HOH 184 A HOH 60 2 HOH HOH 185 A HOH 61 2 HOH HOH 186 A HOH 62 2 HOH HOH 187 A HOH 63 2 HOH HOH 188 A HOH 64 2 HOH HOH 189 A HOH 65 2 HOH HOH 190 A HOH 66 2 HOH HOH 191 A HOH 67 2 HOH HOH 192 A HOH 68 2 HOH HOH 193 A HOH 69 2 HOH HOH 194 A HOH 70 2 HOH HOH 195 A HOH 71 2 HOH HOH 196 A HOH 72 2 HOH HOH 197 A HOH 73 2 HOH HOH 198 A HOH 74 2 HOH HOH 199 A HOH 75 2 HOH HOH 200 A HOH 76 2 HOH HOH 201 A HOH 77 2 HOH HOH 202 A HOH 78 2 HOH HOH 203 A HOH 79 2 HOH HOH 204 A HOH 80 2 HOH HOH 205 A HOH 81 2 HOH HOH 206 A HOH 82 2 HOH HOH 207 A HOH 83 2 HOH HOH 208 A HOH 84 2 HOH HOH 209 A HOH 85 2 HOH HOH 210 A HOH 86 2 HOH HOH 211 A HOH 87 2 HOH HOH 212 A HOH 88 2 HOH HOH 213 A HOH 89 2 HOH HOH 214 A HOH 90 2 HOH HOH 215 A HOH 91 2 HOH HOH 216 A HOH 92 2 HOH HOH 217 A HOH 93 2 HOH HOH 218 A HOH 94 2 HOH HOH 219 A HOH 95 2 HOH HOH 220 A HOH 96 2 HOH HOH 221 A HOH 97 2 HOH HOH 222 A HOH 98 2 HOH HOH 223 A HOH 99 2 HOH HOH 224 A HOH 100 2 HOH HOH 225 A HOH 101 2 HOH HOH 226 A HOH 102 2 HOH HOH 227 A HOH 103 2 HOH HOH 228 A HOH 104 2 HOH HOH 229 A HOH 105 2 HOH HOH 230 A HOH 106 2 HOH HOH 231 A HOH 107 2 HOH HOH 232 A HOH 108 2 HOH HOH 233 A HOH 109 2 HOH HOH 234 A HOH 110 2 HOH HOH 235 A HOH 111 2 HOH HOH 236 A HOH 112 2 HOH HOH 237 A HOH 113 2 HOH HOH 238 A HOH 114 2 HOH HOH 239 A HOH 115 2 HOH HOH 240 A HOH 116 2 HOH HOH 241 A HOH 117 2 HOH HOH 242 A HOH 118 2 HOH HOH 243 A HOH 119 2 HOH HOH 244 A HOH 120 2 HOH HOH 245 A HOH 121 2 HOH HOH 246 A HOH 122 2 HOH HOH 247 A HOH 123 2 HOH HOH 248 A HOH 124 2 HOH HOH 249 A HOH 125 2 HOH HOH 250 A HOH 126 2 HOH HOH 251 A HOH 127 2 HOH HOH 252 A HOH 128 2 HOH HOH 253 A HOH 129 2 HOH HOH 254 A HOH 130 2 HOH HOH 255 A HOH 131 2 HOH HOH 256 A HOH 132 2 HOH HOH 257 A HOH 133 2 HOH HOH 258 A HOH 134 2 HOH HOH 259 A HOH 135 2 HOH HOH 260 A HOH 136 2 HOH HOH 261 A HOH 137 2 HOH HOH 262 A HOH 138 2 HOH HOH 263 A HOH 139 2 HOH HOH 264 A HOH 140 2 HOH HOH 265 A HOH 141 2 HOH HOH 266 A HOH 142 2 HOH HOH 267 A HOH 143 2 HOH HOH 268 A HOH 144 2 HOH HOH 269 A HOH 145 2 HOH HOH 270 A HOH 146 2 HOH HOH 271 A HOH 147 2 HOH HOH 272 A HOH 148 2 HOH HOH 273 A HOH 149 2 HOH HOH 274 A HOH 150 2 HOH HOH 275 A HOH 151 2 HOH HOH 276 A HOH 152 2 HOH HOH 277 A HOH 153 2 HOH HOH 278 A HOH 154 2 HOH HOH 279 A HOH 155 2 HOH HOH 280 A HOH 156 2 HOH HOH 281 A HOH 157 2 HOH HOH 282 A HOH 158 2 HOH HOH 283 A HOH 159 2 HOH HOH 284 A HOH 160 2 HOH HOH 285 A HOH 161 2 HOH HOH 286 A HOH 162 2 HOH HOH 287 A HOH 163 2 HOH HOH 288 A HOH 164 2 HOH HOH 289 A HOH 165 2 HOH HOH 290 A HOH 166 2 HOH HOH 291 A HOH 167 2 HOH HOH 292 A HOH 168 2 HOH HOH 293 A HOH 169 2 HOH HOH 294 A HOH 170 2 HOH HOH 295 A HOH 171 2 HOH HOH 296 A HOH 172 2 HOH HOH 297 A HOH 173 2 HOH HOH 298 A HOH 174 2 HOH HOH 299 A HOH 175 2 HOH HOH 300 A HOH 176 2 HOH HOH 301 A HOH 177 2 HOH HOH 302 A HOH 178 2 HOH HOH 303 A HOH 179 2 HOH HOH 304 A HOH 180 2 HOH HOH 305 A HOH 181 2 HOH HOH 306 A HOH 182 2 HOH HOH 307 A HOH 183 2 HOH HOH 308 A HOH 184 2 HOH HOH 309 A HOH 185 2 HOH HOH 310 A HOH 186 2 HOH HOH 311 A HOH 187 2 HOH HOH 312 A HOH 188 2 HOH HOH 313 A HOH 189 2 HOH HOH 314 A HOH 190 2 HOH HOH 315 A HOH 191 2 HOH HOH 316 A HOH 192 2 HOH HOH 317 A HOH 193 2 HOH HOH 318 A HOH 194 2 HOH HOH 319 A HOH 195 2 HOH HOH 320 A HOH 196 2 HOH HOH 321 A HOH 197 2 HOH HOH 322 A HOH 198 2 HOH HOH 323 A HOH 199 2 HOH HOH 324 A HOH 200 2 HOH HOH 325 A HOH 201 2 HOH HOH 326 A HOH 202 2 HOH HOH 327 A HOH 203 2 HOH HOH 328 A HOH 204 2 HOH HOH 329 A HOH 205 2 HOH HOH 330 A HOH 206 2 HOH HOH 331 A HOH 207 2 HOH HOH 332 A HOH 208 2 HOH HOH 333 A HOH 209 2 HOH HOH 334 A HOH 210 2 HOH HOH 335 A HOH 211 2 HOH HOH 336 A HOH 212 2 HOH HOH 337 A HOH 213 2 HOH HOH 338 A HOH 214 2 HOH HOH 339 A HOH 215 2 HOH HOH 340 A HOH 216 2 HOH HOH 341 A HOH 217 2 HOH HOH 342 A HOH 218 2 HOH HOH 343 A HOH 219 2 HOH HOH 344 A HOH 220 2 HOH HOH 345 A HOH 221 2 HOH HOH 346 A HOH 222 2 HOH HOH 347 A HOH 223 2 HOH HOH 348 A HOH 224 2 HOH HOH 349 A HOH 225 2 HOH HOH 350 A HOH 226 2 HOH HOH 351 A HOH 227 2 HOH HOH 352 A HOH 228 2 HOH HOH 353 A HOH 229 2 HOH HOH 354 A HOH 230 2 HOH HOH 355 A HOH 231 2 HOH HOH 356 A HOH 232 2 HOH HOH 357 A HOH 233 2 HOH HOH 358 A HOH 234 2 HOH HOH 359 A HOH 235 2 HOH HOH 360 A HOH 236 2 HOH HOH 361 A HOH 237 2 HOH HOH 362 A HOH 238 2 HOH HOH 363 A HOH 239 2 HOH HOH 364 A HOH 240 2 HOH HOH 365 A HOH 241 2 HOH HOH 366 A HOH 242 2 HOH HOH 367 A HOH 243 2 HOH HOH 368 A HOH 244 2 HOH HOH 369 A HOH 245 2 HOH HOH 370 A n 1 1 A n 2 2 A n 3 3 A ASP 4 n 4 ASP 4 A ALA 5 n 5 ALA 5 A PRO 6 n 6 PRO 6 A GLY 7 n 7 GLY 7 A ALA 8 n 8 ARG 8 A SER 9 n 9 SER 9 A GLN 10 n 10 GLN 10 A PHE 11 n 11 PHE 11 A VAL 12 n 12 VAL 12 A PRO 13 n 13 PRO 13 A ALA 14 n 14 ALA 14 A ASP 15 n 15 ASP 15 A GLN 16 n 16 GLN 16 A ALA 17 n 17 ALA 17 A PHE 18 n 18 PHE 18 A ALA 19 n 19 ALA 19 A PHE 20 n 20 PHE 20 A ASP 21 n 21 ASP 21 A PHE 22 n 22 PHE 22 A GLN 23 n 23 GLN 23 A GLN 24 n 24 GLN 24 A ASN 25 n 25 ASN 25 A GLN 26 n 26 GLN 26 A HIS 27 n 27 HIS 27 A ASP 28 n 28 ASP 28 A LEU 29 n 29 LEU 29 A ASN 30 n 30 ASN 30 A LEU 31 n 31 LEU 31 A THR 32 n 32 THR 32 A TRP 33 n 33 TRP 33 A GLN 34 n 34 GLN 34 A ILE 35 n 35 ILE 35 A LYS 36 n 36 LYS 36 A ASP 37 n 37 ASP 37 A GLY 38 n 38 GLY 38 A TYR 39 n 39 TYR 39 A TYR 40 n 40 TYR 40 A LEU 41 n 41 LEU 41 A TYR 42 n 42 TYR 42 A ARG 43 n 43 ARG 43 A LYS 44 n 44 LYS 44 A GLN 45 n 45 GLN 45 A ILE 46 n 46 ILE 46 A ARG 47 n 47 ARG 47 A ILE 48 n 48 ILE 48 A THR 49 n 49 THR 49 A PRO 50 n 50 PRO 50 A GLU 51 n 51 GLU 51 A HIS 52 n 52 HIS 52 A ALA 53 n 53 ALA 53 A LYS 54 n 54 LYS 54 A ILE 55 n 55 ILE 55 A ALA 56 n 56 ALA 56 A ASP 57 n 57 ASP 57 A VAL 58 n 58 VAL 58 A GLN 59 n 59 GLN 59 A LEU 60 n 60 LEU 60 A PRO 61 n 61 PRO 61 A GLN 62 n 62 GLN 62 A GLY 63 n 63 GLY 63 A VAL 64 n 64 VAL 64 A TRP 65 n 65 TRP 65 A HIS 66 n 66 HIS 66 A GLU 67 n 67 GLU 67 A ASP 68 n 68 ASP 68 A GLU 69 n 69 GLU 69 A PHE 70 n 70 PHE 70 A TYR 71 n 71 TYR 71 A GLY 72 n 72 GLY 72 A ALA 73 n 73 LYS 73 A SER 74 n 74 SER 74 A GLU 75 n 75 GLU 75 A ILE 76 n 76 ILE 76 A TYR 77 n 77 TYR 77 A ARG 78 n 78 ARG 78 A ASP 79 n 79 ASP 79 A ARG 80 n 80 ARG 80 A LEU 81 n 81 LEU 81 A THR 82 n 82 THR 82 A LEU 83 n 83 LEU 83 A PRO 84 n 84 PRO 84 A VAL 85 n 85 VAL 85 A THR 86 n 86 THR 86 A ILE 87 n 87 ILE 87 A ASN 88 n 88 ASN 88 A GLN 89 n 89 GLN 89 A ALA 90 n 90 ALA 90 A SER 91 n 91 SER 91 A ALA 92 n 92 ALA 92 A GLY 93 n 93 GLY 93 A ALA 94 n 94 ALA 94 A THR 95 n 95 THR 95 A LEU 96 n 96 LEU 96 A THR 97 n 97 THR 97 A VAL 98 n 98 VAL 98 A THR 99 n 99 THR 99 A TYR 100 n 100 TYR 100 A GLN 101 n 101 GLN 101 A GLY 102 n 102 GLY 102 A CYS 103 n 103 CYS 103 A ALA 104 n 104 ALA 104 A ASP 105 n 105 ASP 105 A ALA 106 n 106 ALA 106 A GLY 107 n 107 GLY 107 A PHE 108 n 108 PHE 108 A CYS 109 n 109 CYS 109 A TYR 110 n 110 TYR 110 A PRO 111 n 111 PRO 111 A PRO 112 n 112 PRO 112 A GLU 113 n 113 GLU 113 A THR 114 n 114 THR 114 A LYS 115 n 115 LYS 115 A THR 116 n 116 THR 116 A VAL 117 n 117 VAL 117 A PRO 118 n 118 PRO 118 A LEU 119 n 119 LEU 119 A SER 120 n 120 SER 120 A GLU 121 n 121 GLU 121 A VAL 122 n 122 VAL 122 A VAL 123 n 123 VAL 123 A ALA 124 n 124 ALA 124 A n 125 125 A 0.1306 0.1408 0.1285 0.1385 0.2146 0.2255 783 925 5 5 14579 15362 author_defined_assembly 1 monomeric 1.0000000000 0.0000000000 0.0000000000 0.0000000000 1.0000000000 0.0000000000 0.0000000000 0.0000000000 1.0000000000 1_555 x,y,z identity operation 0.0000000000 0.0000000000 0.0000000000 A N THR 49 A N THR 49 A O THR 97 A O THR 97 A O VAL 85 A O VAL 85 A N LEU 29 A N LEU 29 A O ASP 28 A O ASP 28 A N ASN 25 A N ASN 25 A N THR 49 A N THR 49 A O THR 97 A O THR 97 A N LEU 96 A N LEU 96 A O VAL 117 A O VAL 117 A N VAL 64 A N VAL 64 A O ILE 76 A O ILE 76 A O TYR 77 A O TYR 77 A N LEU 41 A N LEU 41 A N TYR 40 A N TYR 40 A O CYS 103 A O CYS 103 A N ALA 104 A N ALA 104 A O PHE 108 A O PHE 108 1 A HOH 218 B HOH 1 A CG ARG 8 A CG ARG 8 1 Y 1 A CD ARG 8 A CD ARG 8 1 Y 1 A NE ARG 8 A NE ARG 8 1 Y 1 A CZ ARG 8 A CZ ARG 8 1 Y 1 A NH1 ARG 8 A NH1 ARG 8 1 Y 1 A NH2 ARG 8 A NH2 ARG 8 1 Y 1 A CG LYS 73 A CG LYS 73 1 Y 1 A CD LYS 73 A CD LYS 73 1 Y 1 A CE LYS 73 A CE LYS 73 1 Y 1 A NZ LYS 73 A NZ LYS 73 1 Y 1 A GLY 1 A GLY 1 1 Y 1 A LEU 2 A LEU 2 1 Y 1 A PHE 3 A PHE 3 1 Y 1 A ASN 125 A ASN 125 1 Y 1 7.97 0.90 118.30 126.27 A A A CB CG OD1 ASP ASP ASP 21 21 21 N 1 -3.91 0.50 120.30 116.39 A A A NE CZ NH1 ARG ARG ARG 43 43 43 N 1 5.87 0.90 118.30 124.17 A A A CB CG OD2 ASP ASP ASP 68 68 68 N 1 -4.08 0.50 120.30 116.22 A A A NE CZ NH2 ARG ARG ARG 80 80 80 N 1 A ALA 5 -45.49 157.68 1 A GLN 26 54.50 -115.35 1 A ASP 79 72.39 -63.34 0.2255 0.1385 0.1408 0.1408 1.65 10.00 10826 783 17500 17500 12742 5 93.5 RANDOM 1 FREE R 0.0 MIR ENGH AND HUBER 0 0.00 1202.50 1.65 10.00 245 1203 0 0 958 0.009 0.027 0.000 0.0255 0.038 0.060 0.010 0.003 0.065 0.084 0.2255 0.1385 783 17500 93 1.65 26.84 1L6P 18425 18609 -3.00 -3.00 0.074 1 28.2 98.5 0.382 1.65 5.11 96.7 data reduction DENZO data scaling SCALEPACK refinement SHELXL-97 Thiol:disulfide interchange protein dsbD N-terminal of DsbD (residues 20-144) from E. coli. 1 N N 2 N N A PRO 13 A PRO 13 HELX_P A ALA 17 A ALA 17 1 1 5 A LYS 44 A LYS 44 HELX_P A ILE 46 A ILE 46 5 2 3 disulf 2.038 A CYS 103 A SG CYS 103 1_555 A CYS 109 A SG CYS 109 1_555 ELECTRON TRANSPORT disulfide bond isomerase protein, immunoglobulin-like fold, ELECTRON TRANSPORT DSBD_ECOLI UNP 1 20 P36655 GLFDAPGRSQFVPADQAFAFDFQQNQHDLNLTWQIKDGYYLYRKQIRITPEHAKIADVQLPQGVWHEDEFYGKSEIYRDR LTLPVTINQASAGATLTVTYQGCADAGFCYPPETKTVPLSEVVAN 20 144 1L6P 1 125 P36655 A 1 1 125 4 3 5 anti-parallel anti-parallel anti-parallel anti-parallel anti-parallel anti-parallel anti-parallel anti-parallel anti-parallel A ARG 47 A ARG 47 A ILE 55 A ILE 55 A ARG 80 A ARG 80 A TYR 100 A TYR 100 A ASP 28 A ASP 28 A ILE 35 A ILE 35 A PHE 18 A PHE 18 A ASN 25 A ASN 25 A ARG 47 A ARG 47 A ILE 55 A ILE 55 A ARG 80 A ARG 80 A TYR 100 A TYR 100 A GLU 113 A GLU 113 A PRO 118 A PRO 118 A VAL 64 A VAL 64 A ASP 68 A ASP 68 A GLY 72 A GLY 72 A TYR 77 A TYR 77 A TYR 39 A TYR 39 A TYR 42 A TYR 42 A GLY 102 A GLY 102 A ALA 104 A ALA 104 A PHE 108 A PHE 108 A CYS 109 A CYS 109 20 C 2 2 21