0.021863 0.000000 0.005613 0.000000 0.022109 0.000000 0.000000 0.000000 0.025231 0.00000 0.00000 0.00000 HEMICHROME COORDINATION OF HEME IRON ATOM WITH BOTH THE PROXIMAL AND DISTAL HISTIDINES COORDINATING TO THE HEME IRON ATOM. Hackert, M.L. Mitchell, D.T. http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic 2 90.00 104.40 90.00 45.740 45.230 40.920 C2 H4 O 44.053 ACETYL GROUP non-polymer 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 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 C34 H32 Fe N4 O4 616.487 PROTOPORPHYRIN IX CONTAINING FE HEME non-polymer 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 C5 H11 N O2 S 149.211 y METHIONINE 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 UK J.Mol.Biol. JMOBAK 0070 0022-2836 251 421 431 10.1006/jmbi.1995.0445 7650740 Structural analysis of monomeric hemichrome and dimeric cyanomet hemoglobins from Caudina arenicola. 1995 UK J.Protein Chem. JPCHD2 0935 0277-8033 11 29 Amino Acid Sequence of the Coelomic C Globin from the Sea Cucumber Caudina (Molpadia) Arenicola 1992 US J.Biol.Chem. JBCHA3 0071 0021-9258 254 7400 Preliminary Crystallographic Data on Monomeric and Dimeric Hemoglobins from the Sea Cucumber, Molpadia Arenicola 1979 NE Biochim.Biophys.Acta BBACAQ 0113 0006-3002 428 779 Functional Consequences of Ligand-Linked Dissociation in Hemoglobin from the Sea Cucumber Molpadia Arenicola 1976 UK COMP.BIOCHEM.PHYSIOL. B: BIOCHEM.MOL.BIOL. CBPBB8 2026 0305-0491 55 105 N-Terminal Substitution of Some Sea Cucumber Hemoglobins 1976 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 0.00000 0.00000 0.00000 1 x-ray 1 1.0 17584.166 HEMOGLOBIN (DEOXY) 1 man polymer 616.487 PROTOPORPHYRIN IX CONTAINING FE 1 syn non-polymer 18.015 water 111 nat water no yes (ACE)GGTLAIQAQGDLTLAQKKIVRKTWHQLMRNKTSFVTDVFIRIFAYDPSAQNKFPQMAGMSASQLRSSRQMQAHAI RVSSIMSEYVEELDSDILPELLATLARTHDLNKVGADHYNLFAKVLMEALQAELGSDFNEKTRDAWAKAFSVVQAVLLVK HG XGGTLAIQAQGDLTLAQKKIVRKTWHQLMRNKTSFVTDVFIRIFAYDPSAQNKFPQMAGMSASQLRSSRQMQAHAIRVSS IMSEYVEELDSDILPELLATLARTHDLNKVGADHYNLFAKVLMEALQAELGSDFNEKTRDAWAKAFSVVQAVLLVKHG 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 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 Caudina sample 7698 Caudina arenicola 2.33 47.24 pdbx_database_status struct_conf struct_conf_type repository Initial release Version format compliance Version format compliance Derived calculations Other 1 0 1994-06-22 1 1 2008-03-24 1 2 2011-07-13 1 3 2017-11-29 _pdbx_database_status.process_site Y BNL 1994-03-22 REL REL HEM PROTOPORPHYRIN IX CONTAINING FE HOH water HEM 158 2 HEM HEM 158 A HOH 159 3 HOH HOH 159 A HOH 160 3 HOH HOH 160 A HOH 161 3 HOH HOH 161 A HOH 162 3 HOH HOH 162 A HOH 163 3 HOH HOH 163 A HOH 164 3 HOH HOH 164 A HOH 165 3 HOH HOH 165 A HOH 166 3 HOH HOH 166 A HOH 167 3 HOH HOH 167 A HOH 168 3 HOH HOH 168 A HOH 169 3 HOH HOH 169 A HOH 170 3 HOH HOH 170 A HOH 171 3 HOH HOH 171 A HOH 172 3 HOH HOH 172 A HOH 173 3 HOH HOH 173 A HOH 174 3 HOH HOH 174 A HOH 175 3 HOH HOH 175 A HOH 176 3 HOH HOH 176 A HOH 177 3 HOH HOH 177 A HOH 178 3 HOH HOH 178 A HOH 179 3 HOH HOH 179 A HOH 180 3 HOH HOH 180 A HOH 181 3 HOH HOH 181 A HOH 182 3 HOH HOH 182 A HOH 183 3 HOH HOH 183 A HOH 184 3 HOH HOH 184 A HOH 185 3 HOH HOH 185 A HOH 186 3 HOH HOH 186 A HOH 187 3 HOH HOH 187 A HOH 188 3 HOH HOH 188 A HOH 189 3 HOH HOH 189 A HOH 190 3 HOH HOH 190 A HOH 191 3 HOH HOH 191 A HOH 192 3 HOH HOH 192 A HOH 193 3 HOH HOH 193 A HOH 194 3 HOH HOH 194 A HOH 195 3 HOH HOH 195 A HOH 196 3 HOH HOH 196 A HOH 197 3 HOH HOH 197 A HOH 198 3 HOH HOH 198 A HOH 199 3 HOH HOH 199 A HOH 200 3 HOH HOH 200 A HOH 201 3 HOH HOH 201 A HOH 202 3 HOH HOH 202 A HOH 203 3 HOH HOH 203 A HOH 204 3 HOH HOH 204 A HOH 205 3 HOH HOH 205 A HOH 206 3 HOH HOH 206 A HOH 207 3 HOH HOH 207 A HOH 208 3 HOH HOH 208 A HOH 209 3 HOH HOH 209 A HOH 210 3 HOH HOH 210 A HOH 211 3 HOH HOH 211 A HOH 212 3 HOH HOH 212 A HOH 213 3 HOH HOH 213 A HOH 214 3 HOH HOH 214 A HOH 215 3 HOH HOH 215 A HOH 216 3 HOH HOH 216 A HOH 217 3 HOH HOH 217 A HOH 218 3 HOH HOH 218 A HOH 219 3 HOH HOH 219 A HOH 220 3 HOH HOH 220 A HOH 221 3 HOH HOH 221 A HOH 222 3 HOH HOH 222 A HOH 223 3 HOH HOH 223 A HOH 224 3 HOH HOH 224 A HOH 225 3 HOH HOH 225 A HOH 226 3 HOH HOH 226 A HOH 227 3 HOH HOH 227 A HOH 228 3 HOH HOH 228 A HOH 229 3 HOH HOH 229 A HOH 230 3 HOH HOH 230 A HOH 231 3 HOH HOH 231 A HOH 232 3 HOH HOH 232 A HOH 233 3 HOH HOH 233 A HOH 234 3 HOH HOH 234 A HOH 235 3 HOH HOH 235 A HOH 236 3 HOH HOH 236 A HOH 237 3 HOH HOH 237 A HOH 238 3 HOH HOH 238 A HOH 239 3 HOH HOH 239 A HOH 240 3 HOH HOH 240 A HOH 241 3 HOH HOH 241 A HOH 242 3 HOH HOH 242 A HOH 243 3 HOH HOH 243 A HOH 244 3 HOH HOH 244 A HOH 245 3 HOH HOH 245 A HOH 246 3 HOH HOH 246 A HOH 247 3 HOH HOH 247 A HOH 248 3 HOH HOH 248 A HOH 249 3 HOH HOH 249 A HOH 250 3 HOH HOH 250 A HOH 251 3 HOH HOH 251 A HOH 252 3 HOH HOH 252 A HOH 253 3 HOH HOH 253 A HOH 254 3 HOH HOH 254 A HOH 255 3 HOH HOH 255 A HOH 256 3 HOH HOH 256 A HOH 257 3 HOH HOH 257 A HOH 258 3 HOH HOH 258 A HOH 259 3 HOH HOH 259 A HOH 260 3 HOH HOH 260 A HOH 261 3 HOH HOH 261 A HOH 262 3 HOH HOH 262 A HOH 263 3 HOH HOH 263 A HOH 264 3 HOH HOH 264 A HOH 265 3 HOH HOH 265 A HOH 266 3 HOH HOH 266 A HOH 267 3 HOH HOH 267 A HOH 268 3 HOH HOH 268 A HOH 269 3 HOH HOH 269 A ACE 0 n 1 ACE 0 A GLY 1 n 2 GLY 1 A GLY 2 n 3 GLY 2 A THR 3 n 4 THR 3 A LEU 4 n 5 LEU 4 A ALA 5 n 6 ALA 5 A ILE 6 n 7 ILE 6 A GLN 7 n 8 GLN 7 A ALA 8 n 9 ALA 8 A GLN 9 n 10 GLN 9 A GLY 10 n 11 GLY 10 A ASP 11 n 12 ASP 11 A LEU 12 n 13 LEU 12 A THR 13 n 14 THR 13 A LEU 14 n 15 LEU 14 A ALA 15 n 16 ALA 15 A GLN 16 n 17 GLN 16 A LYS 17 n 18 LYS 17 A LYS 18 n 19 LYS 18 A ILE 19 n 20 ILE 19 A VAL 20 n 21 VAL 20 A ARG 21 n 22 ARG 21 A LYS 22 n 23 LYS 22 A THR 23 n 24 THR 23 A TRP 24 n 25 TRP 24 A HIS 25 n 26 HIS 25 A GLN 26 n 27 GLN 26 A LEU 27 n 28 LEU 27 A MET 28 n 29 MET 28 A ARG 29 n 30 ARG 29 A ASN 30 n 31 ASN 30 A LYS 31 n 32 LYS 31 A THR 32 n 33 THR 32 A SER 33 n 34 SER 33 A PHE 34 n 35 PHE 34 A VAL 35 n 36 VAL 35 A THR 36 n 37 THR 36 A ASP 37 n 38 ASP 37 A VAL 38 n 39 VAL 38 A PHE 39 n 40 PHE 39 A ILE 40 n 41 ILE 40 A ARG 41 n 42 ARG 41 A ILE 42 n 43 ILE 42 A PHE 43 n 44 PHE 43 A ALA 44 n 45 ALA 44 A TYR 45 n 46 TYR 45 A ASP 46 n 47 ASP 46 A PRO 47 n 48 PRO 47 A SER 48 n 49 SER 48 A ALA 49 n 50 ALA 49 A GLN 50 n 51 GLN 50 A ASN 51 n 52 ASN 51 A LYS 52 n 53 LYS 52 A PHE 53 n 54 PHE 53 A PRO 54 n 55 PRO 54 A GLN 55 n 56 GLN 55 A MET 56 n 57 MET 56 A ALA 57 n 58 ALA 57 A GLY 58 n 59 GLY 58 A MET 59 n 60 MET 59 A SER 60 n 61 SER 60 A ALA 61 n 62 ALA 61 A SER 62 n 63 SER 62 A GLN 63 n 64 GLN 63 A LEU 64 n 65 LEU 64 A ARG 65 n 66 ARG 65 A SER 66 n 67 SER 66 A SER 67 n 68 SER 67 A ARG 68 n 69 ARG 68 A GLN 69 n 70 GLN 69 A MET 70 n 71 MET 70 A GLN 71 n 72 GLN 71 A ALA 72 n 73 ALA 72 A HIS 73 n 74 HIS 73 A ALA 74 n 75 ALA 74 A ILE 75 n 76 ILE 75 A ARG 76 n 77 ARG 76 A VAL 77 n 78 VAL 77 A SER 78 n 79 SER 78 A SER 79 n 80 SER 79 A ILE 80 n 81 ILE 80 A MET 81 n 82 MET 81 A SER 82 n 83 SER 82 A GLU 83 n 84 GLU 83 A TYR 84 n 85 TYR 84 A VAL 85 n 86 VAL 85 A GLU 86 n 87 GLU 86 A GLU 87 n 88 GLU 87 A LEU 88 n 89 LEU 88 A ASP 89 n 90 ASP 89 A SER 90 n 91 SER 90 A ASP 91 n 92 ASP 91 A ILE 92 n 93 ILE 92 A LEU 93 n 94 LEU 93 A PRO 94 n 95 PRO 94 A GLU 95 n 96 GLU 95 A LEU 96 n 97 LEU 96 A LEU 97 n 98 LEU 97 A ALA 98 n 99 ALA 98 A THR 99 n 100 THR 99 A LEU 100 n 101 LEU 100 A ALA 101 n 102 ALA 101 A ARG 102 n 103 ARG 102 A THR 103 n 104 THR 103 A HIS 104 n 105 HIS 104 A ASP 105 n 106 ASP 105 A LEU 106 n 107 LEU 106 A ASN 107 n 108 ASN 107 A LYS 108 n 109 LYS 108 A VAL 109 n 110 VAL 109 A GLY 110 n 111 GLY 110 A ALA 111 n 112 ALA 111 A ASP 112 n 113 ASP 112 A HIS 113 n 114 HIS 113 A TYR 114 n 115 TYR 114 A ASN 115 n 116 ASN 115 A LEU 116 n 117 LEU 116 A PHE 117 n 118 PHE 117 A ALA 118 n 119 ALA 118 A LYS 119 n 120 LYS 119 A VAL 120 n 121 VAL 120 A LEU 121 n 122 LEU 121 A MET 122 n 123 MET 122 A GLU 123 n 124 GLU 123 A ALA 124 n 125 ALA 124 A LEU 125 n 126 LEU 125 A GLN 126 n 127 GLN 126 A ALA 127 n 128 ALA 127 A GLU 128 n 129 GLU 128 A LEU 129 n 130 LEU 129 A GLY 130 n 131 GLY 130 A SER 131 n 132 SER 131 A ASP 132 n 133 ASP 132 A PHE 133 n 134 PHE 133 A ASN 134 n 135 ASN 134 A GLU 135 n 136 GLU 135 A LYS 136 n 137 LYS 136 A THR 137 n 138 THR 137 A ARG 138 n 139 ARG 138 A ASP 139 n 140 ASP 139 A ALA 140 n 141 ALA 140 A TRP 141 n 142 TRP 141 A ALA 142 n 143 ALA 142 A LYS 143 n 144 LYS 143 A ALA 144 n 145 ALA 144 A PHE 145 n 146 PHE 145 A SER 146 n 147 SER 146 A VAL 147 n 148 VAL 147 A VAL 148 n 149 VAL 148 A GLN 149 n 150 GLN 149 A ALA 150 n 151 ALA 150 A VAL 151 n 152 VAL 151 A LEU 152 n 153 LEU 152 A LEU 153 n 154 LEU 153 A VAL 154 n 155 VAL 154 A LYS 155 n 156 LYS 155 A HIS 156 n 157 HIS 156 A GLY 157 n 158 GLY 157 A author_defined_assembly 1 monomeric A HIS 73 A NE2 HIS 74 1_555 A HEM 158 B FE HEM 1_555 A HEM 158 B NA HEM 1_555 91.4 A HIS 73 A NE2 HIS 74 1_555 A HEM 158 B FE HEM 1_555 A HEM 158 B NB HEM 1_555 92.3 A HEM 158 B NA HEM 1_555 A HEM 158 B FE HEM 1_555 A HEM 158 B NB HEM 1_555 91.4 A HIS 73 A NE2 HIS 74 1_555 A HEM 158 B FE HEM 1_555 A HEM 158 B NC HEM 1_555 89.4 A HEM 158 B NA HEM 1_555 A HEM 158 B FE HEM 1_555 A HEM 158 B NC HEM 1_555 179.2 A HEM 158 B NB HEM 1_555 A HEM 158 B FE HEM 1_555 A HEM 158 B NC HEM 1_555 88.3 A HIS 73 A NE2 HIS 74 1_555 A HEM 158 B FE HEM 1_555 A HEM 158 B ND HEM 1_555 83.2 A HEM 158 B NA HEM 1_555 A HEM 158 B FE HEM 1_555 A HEM 158 B ND HEM 1_555 87.9 A HEM 158 B NB HEM 1_555 A HEM 158 B FE HEM 1_555 A HEM 158 B ND HEM 1_555 175.4 A HEM 158 B NC HEM 1_555 A HEM 158 B FE HEM 1_555 A HEM 158 B ND HEM 1_555 92.4 A HIS 73 A NE2 HIS 74 1_555 A HEM 158 B FE HEM 1_555 A HIS 104 A NE2 HIS 105 1_555 176.7 A HEM 158 B NA HEM 1_555 A HEM 158 B FE HEM 1_555 A HIS 104 A NE2 HIS 105 1_555 88.9 A HEM 158 B NB HEM 1_555 A HEM 158 B FE HEM 1_555 A HIS 104 A NE2 HIS 105 1_555 90.9 A HEM 158 B NC HEM 1_555 A HEM 158 B FE HEM 1_555 A HIS 104 A NE2 HIS 105 1_555 90.4 A HEM 158 B ND HEM 1_555 A HEM 158 B FE HEM 1_555 A HIS 104 A NE2 HIS 105 1_555 93.6 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 1 A A H HZ3 LEU LYS 12 17 1.31 1 7.24 0.80 106.30 113.54 A A A CD1 CG CD2 TRP TRP TRP 24 24 24 N 1 -6.42 0.80 107.30 100.88 A A A CE2 CD2 CG TRP TRP TRP 24 24 24 N 1 10.95 1.70 113.30 124.25 A A A CA CB CG MET MET MET 56 56 56 N 1 5.79 0.50 120.30 126.09 A A A NE CZ NH1 ARG ARG ARG 76 76 76 N 1 -4.95 0.50 120.30 115.35 A A A NE CZ NH2 ARG ARG ARG 76 76 76 N 1 -6.05 0.60 121.00 114.95 A A A CB CG CD2 TYR TYR TYR 84 84 84 N 1 16.33 2.30 115.30 131.63 A A A CA CB CG LEU LEU LEU 100 100 100 N 1 6.85 0.80 106.30 113.15 A A A CD1 CG CD2 TRP TRP TRP 141 141 141 N 1 -6.36 0.80 107.30 100.94 A A A CE2 CD2 CG TRP TRP TRP 141 141 141 N 1 22.65 2.70 111.00 133.65 A A A N CA C LEU LEU LEU 153 153 153 N 1 -18.87 2.20 117.20 98.33 A A A CA C N LEU LEU VAL 153 153 154 Y 1 11.42 1.50 110.90 122.32 A A A CA CB CG1 VAL VAL VAL 154 154 154 N 1 -15.01 1.50 110.90 95.89 A A A CA CB CG2 VAL VAL VAL 154 154 154 N 1 22.49 2.70 111.00 133.49 A A A N CA C VAL VAL VAL 154 154 154 N 1 12.89 2.10 120.10 132.99 A A A CA C O VAL VAL VAL 154 154 154 N 1 -27.94 2.20 117.20 89.26 A A A CA C N VAL VAL LYS 154 154 155 Y 1 10.93 1.60 122.70 133.63 A A A O C N VAL VAL LYS 154 154 155 Y 1 -16.73 2.70 111.00 94.27 A A A N CA C LYS LYS LYS 155 155 155 N 1 A A NE2 CD2 HIS HIS 25 25 -0.072 0.011 1.373 1.301 N 1 A A NE2 CD2 HIS HIS 73 73 -0.067 0.011 1.373 1.306 N 1 A A NE2 CD2 HIS HIS 104 104 -0.077 0.011 1.373 1.296 N 1 A A NE2 CD2 HIS HIS 113 113 -0.074 0.011 1.373 1.299 N 1 A A NE2 CD2 HIS HIS 156 156 -0.070 0.011 1.373 1.303 N 1 A LEU 4 70.63 -2.20 1 A ALA 5 43.94 -90.54 1 A GLN 7 -163.39 -78.27 1 A ALA 8 60.09 -33.82 1 A GLN 9 38.69 -137.50 1 A ASP 11 -62.17 -73.22 1 A ALA 61 -22.12 -48.23 1 A GLU 135 8.85 -24.36 1 A LEU 153 51.17 121.37 1 A VAL 154 53.05 116.26 1 A LYS 155 -156.43 67.57 0.1500000 0.1500000 2.5 5.0 4916 1 3.0 2.5 5.0 111 1390 43 0 1236 0.014 3.59 model building X-PLOR refinement X-PLOR phasing X-PLOR HEMOGLOBIN (SEA CUCUMBER) Structural analysis of monomeric hemichrome and dimeric cyanomet hemoglobins from Caudina arenicola 1 N N 2 N N 3 N N A THR 13 A THR 14 HELX_P A MET 28 A MET 29 1 A 16 A SER 33 A SER 34 HELX_P A TYR 45 A TYR 46 1 B 13 A ASP 46 A ASP 47 HELX_P A LYS 52 A LYS 53 1 C 7 A SER 60 A SER 61 HELX_P A SER 66 A SER 67 1 D 7 A SER 67 A SER 68 HELX_P DISTAL HIS 73 A GLU 86 A GLU 87 1 E 20 A ASP 91 A ASP 92 HELX_P KINK AT PRO 93, PROX. HIS 104 A LEU 106 A LEU 107 1 F 16 A GLY 110 A GLY 111 HELX_P A GLU 128 A GLU 129 1 G 19 A ASN 134 A ASN 135 HELX_P A ALA 150 A ALA 151 1 H 17 covale 1.339 A ACE 0 A C ACE 1 1_555 A GLY 1 A N GLY 2 1_555 metalc 2.074 A HEM 158 B FE HEM 1_555 A HIS 73 A NE2 HIS 74 1_555 metalc 2.065 A HEM 158 B FE HEM 1_555 A HIS 104 A NE2 HIS 105 1_555 OXYGEN TRANSPORT OXYGEN TRANSPORT GLBC_CAUAR UNP 1 1 P80018 GGTLAIQAQGDLTLAQKKIVRKTWHQLMRNKTSFVTDVFIRIFAYDPSAQNKFPQMAGMSASQLRSSRQMQAHAIRVSSI MSEYVEELDSDILPELLATLARTHDLNKVGADHYNLFAKVLMEALQAELGSDFNEKTRDAWAKAFSVVQAVLLVKHGN 1 157 1HLB 1 157 P80018 A 1 2 158 BINDING SITE FOR RESIDUE HEM A 158 Software 16 A PHE 39 A PHE 40 16 1_555 A ALA 49 A ALA 50 16 1_555 A LYS 52 A LYS 53 16 1_555 A PHE 53 A PHE 54 16 1_555 A HIS 73 A HIS 74 16 1_555 A ARG 76 A ARG 77 16 1_555 A THR 99 A THR 100 16 1_555 A THR 103 A THR 104 16 1_555 A HIS 104 A HIS 105 16 1_555 A ASN 107 A ASN 108 16 1_555 A VAL 109 A VAL 110 16 1_555 A HIS 113 A HIS 114 16 1_555 A PHE 117 A PHE 118 16 1_555 A HOH 183 C HOH 16 1_555 A HOH 211 C HOH 16 1_555 A HOH 261 C HOH 16 1_555 4 P 1 21 1