0.019231 0.011103 0.000000 0.000000 0.022206 0.000000 0.000000 0.000000 0.012953 0.00000 0.00000 0.00000 Dauter, Z. Wilson, K.S. Sieker, L.C. Moulis, J.M. http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic 6 90.00 90.00 120.00 52.000 52.000 77.200 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 C5 H11 N O2 S 149.211 y METHIONINE 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 Fe4 S4 351.640 IRON/SULFUR CLUSTER non-polymer C4 H9 N O3 119.119 y THREONINE 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 Protein Sci. PRCIEI 0795 0961-8368 5 1765 1775 8880900 Crystal structure of the 2[4Fe-4S] ferredoxin from Chromatium vinosum: evolutionary and mechanistic inferences for [3/4Fe-4S] ferredoxins. 1996 10.2210/pdb1blu/pdb pdb_00001blu 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 IMAGE PLATE 1993-10 MARRESEARCH M x-ray 1 0.92 1.0 X11 EMBL/DESY, HAMBURG 0.92 SYNCHROTRON EMBL/DESY, HAMBURG BEAMLINE X11 9064.004 FERREDOXIN 1 nat polymer 351.640 IRON/SULFUR CLUSTER 2 syn non-polymer 18.015 water 85 nat water no no ALMITDECINCDVCEPECPNGAISQGDETYVIEPSLCTECVGHYETSQCVEVCPVDCIIKDPSHEETEDELRAKYERITG EG ALMITDECINCDVCEPECPNGAISQGDETYVIEPSLCTECVGHYETSQCVEVCPVDCIIKDPSHEETEDELRAKYERITG EG 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 Allochromatium sample 1049 Allochromatium vinosum 3.32 63. 6.5 CRYSTALS WERE GROWN AT ROOM TEMPERATURE IN 0.1M TRIS-MALEATE BUFFER, PH 6.5 CONTAINING 2.9 M AMMONIUM SULPHATE AND 0.1 M NACL room temp database_2 diffrn_source pdbx_initial_refinement_model pdbx_struct_conn_angle struct_conn struct_site repository Initial release Version format compliance Version format compliance Data collection Database references Derived calculations Refinement description 1 0 1996-11-08 1 1 2008-03-24 1 2 2011-07-13 1 3 2023-08-02 _database_2.pdbx_DOI _database_2.pdbx_database_accession _diffrn_source.pdbx_synchrotron_site _pdbx_struct_conn_angle.ptnr1_auth_seq_id _pdbx_struct_conn_angle.ptnr1_label_asym_id _pdbx_struct_conn_angle.ptnr1_label_atom_id _pdbx_struct_conn_angle.ptnr1_label_seq_id _pdbx_struct_conn_angle.ptnr2_auth_seq_id _pdbx_struct_conn_angle.ptnr2_label_asym_id _pdbx_struct_conn_angle.ptnr2_label_atom_id _pdbx_struct_conn_angle.ptnr3_auth_seq_id _pdbx_struct_conn_angle.ptnr3_label_asym_id _pdbx_struct_conn_angle.ptnr3_label_atom_id _pdbx_struct_conn_angle.value _struct_conn.pdbx_dist_value _struct_conn.ptnr1_auth_comp_id _struct_conn.ptnr1_auth_seq_id _struct_conn.ptnr1_label_asym_id _struct_conn.ptnr1_label_atom_id _struct_conn.ptnr1_label_comp_id _struct_conn.ptnr1_label_seq_id _struct_conn.ptnr2_auth_comp_id _struct_conn.ptnr2_auth_seq_id _struct_conn.ptnr2_label_asym_id _struct_conn.ptnr2_label_atom_id _struct_conn.ptnr2_label_comp_id _struct_conn.ptnr2_label_seq_id _struct_site.pdbx_auth_asym_id _struct_site.pdbx_auth_comp_id _struct_site.pdbx_auth_seq_id Y BNL 1996-04-16 REL REL SF4 IRON/SULFUR CLUSTER HOH water 1FDX PDB experimental model FS4 101 2 SF4 SF4 101 A FS4 102 2 SF4 SF4 102 A HOH 1 3 HOH HOH 103 A HOH 2 3 HOH HOH 104 A HOH 3 3 HOH HOH 105 A HOH 4 3 HOH HOH 106 A HOH 5 3 HOH HOH 107 A HOH 6 3 HOH HOH 108 A HOH 7 3 HOH HOH 109 A HOH 8 3 HOH HOH 110 A HOH 9 3 HOH HOH 111 A HOH 10 3 HOH HOH 112 A HOH 11 3 HOH HOH 113 A HOH 12 3 HOH HOH 114 A HOH 13 3 HOH HOH 115 A HOH 14 3 HOH HOH 116 A HOH 15 3 HOH HOH 117 A HOH 16 3 HOH HOH 118 A HOH 17 3 HOH HOH 119 A HOH 18 3 HOH HOH 120 A HOH 19 3 HOH HOH 121 A HOH 20 3 HOH HOH 122 A HOH 21 3 HOH HOH 123 A HOH 22 3 HOH HOH 124 A HOH 23 3 HOH HOH 125 A HOH 24 3 HOH HOH 126 A HOH 25 3 HOH HOH 127 A HOH 26 3 HOH HOH 128 A HOH 27 3 HOH HOH 129 A HOH 28 3 HOH HOH 130 A HOH 29 3 HOH HOH 131 A HOH 30 3 HOH HOH 132 A HOH 31 3 HOH HOH 133 A HOH 32 3 HOH HOH 134 A HOH 33 3 HOH HOH 135 A HOH 34 3 HOH HOH 136 A HOH 35 3 HOH HOH 137 A HOH 36 3 HOH HOH 138 A HOH 37 3 HOH HOH 139 A HOH 38 3 HOH HOH 140 A HOH 39 3 HOH HOH 141 A HOH 40 3 HOH HOH 142 A HOH 41 3 HOH HOH 143 A HOH 42 3 HOH HOH 144 A HOH 43 3 HOH HOH 145 A HOH 44 3 HOH HOH 146 A HOH 45 3 HOH HOH 147 A HOH 46 3 HOH HOH 148 A HOH 47 3 HOH HOH 149 A HOH 48 3 HOH HOH 150 A HOH 49 3 HOH HOH 151 A HOH 50 3 HOH HOH 152 A HOH 51 3 HOH HOH 153 A HOH 52 3 HOH HOH 154 A HOH 53 3 HOH HOH 155 A HOH 54 3 HOH HOH 156 A HOH 55 3 HOH HOH 157 A HOH 56 3 HOH HOH 158 A HOH 57 3 HOH HOH 159 A HOH 58 3 HOH HOH 160 A HOH 59 3 HOH HOH 161 A HOH 60 3 HOH HOH 162 A HOH 61 3 HOH HOH 163 A HOH 62 3 HOH HOH 164 A HOH 63 3 HOH HOH 165 A HOH 64 3 HOH HOH 166 A HOH 65 3 HOH HOH 167 A HOH 66 3 HOH HOH 168 A HOH 67 3 HOH HOH 169 A HOH 68 3 HOH HOH 170 A HOH 69 3 HOH HOH 171 A HOH 70 3 HOH HOH 172 A HOH 71 3 HOH HOH 173 A HOH 72 3 HOH HOH 174 A HOH 73 3 HOH HOH 175 A HOH 74 3 HOH HOH 176 A HOH 75 3 HOH HOH 177 A HOH 76 3 HOH HOH 178 A HOH 77 3 HOH HOH 179 A HOH 78 3 HOH HOH 180 A HOH 79 3 HOH HOH 181 A HOH 80 3 HOH HOH 182 A HOH 81 3 HOH HOH 183 A HOH 82 3 HOH HOH 184 A HOH 83 3 HOH HOH 185 A HOH 84 3 HOH HOH 186 A HOH 85 3 HOH HOH 187 A ALA 1 n 1 ALA 1 A LEU 2 n 2 LEU 2 A MET 3 n 3 MET 3 A ILE 4 n 4 ILE 4 A THR 5 n 5 THR 5 A ASP 6 n 6 ASP 6 A GLU 7 n 7 GLU 7 A CYS 8 n 8 CYS 8 A ILE 9 n 9 ILE 9 A ASN 10 n 10 ASN 10 A CYS 11 n 11 CYS 11 A ASP 12 n 12 ASP 12 A VAL 13 n 13 VAL 13 A CYS 14 n 14 CYS 14 A GLU 15 n 15 GLU 15 A PRO 16 n 16 PRO 16 A GLU 17 n 17 GLU 17 A CYS 18 n 18 CYS 18 A PRO 19 n 19 PRO 19 A ASN 20 n 20 ASN 20 A GLY 21 n 21 GLY 21 A ALA 22 n 22 ALA 22 A ILE 23 n 23 ILE 23 A SER 24 n 24 SER 24 A GLN 25 n 25 GLN 25 A GLY 26 n 26 GLY 26 A ASP 27 n 27 ASP 27 A GLU 28 n 28 GLU 28 A THR 29 n 29 THR 29 A TYR 30 n 30 TYR 30 A VAL 31 n 31 VAL 31 A ILE 32 n 32 ILE 32 A GLU 33 n 33 GLU 33 A PRO 34 n 34 PRO 34 A SER 35 n 35 SER 35 A LEU 36 n 36 LEU 36 A CYS 37 n 37 CYS 37 A THR 38 n 38 THR 38 A GLU 39 n 39 GLU 39 A CYS 40 n 40 CYS 40 A VAL 41 n 41 VAL 41 A GLY 42 n 42 GLY 42 A HIS 43 n 43 HIS 43 A TYR 44 n 44 TYR 44 A GLU 45 n 45 GLU 45 A THR 46 n 46 THR 46 A SER 47 n 47 SER 47 A GLN 48 n 48 GLN 48 A CYS 49 n 49 CYS 49 A VAL 50 n 50 VAL 50 A GLU 51 n 51 GLU 51 A VAL 52 n 52 VAL 52 A CYS 53 n 53 CYS 53 A PRO 54 n 54 PRO 54 A VAL 55 n 55 VAL 55 A ASP 56 n 56 ASP 56 A CYS 57 n 57 CYS 57 A ILE 58 n 58 ILE 58 A ILE 59 n 59 ILE 59 A LYS 60 n 60 LYS 60 A ASP 61 n 61 ASP 61 A PRO 62 n 62 PRO 62 A SER 63 n 63 SER 63 A HIS 64 n 64 HIS 64 A GLU 65 n 65 GLU 65 A GLU 66 n 66 GLU 66 A THR 67 n 67 THR 67 A GLU 68 n 68 GLU 68 A ASP 69 n 69 ASP 69 A GLU 70 n 70 GLU 70 A LEU 71 n 71 LEU 71 A ARG 72 n 72 ARG 72 A ALA 73 n 73 ALA 73 A LYS 74 n 74 LYS 74 A TYR 75 n 75 TYR 75 A GLU 76 n 76 GLU 76 A ARG 77 n 77 ARG 77 A ILE 78 n 78 ILE 78 A THR 79 n 79 THR 79 A GLY 80 n 80 GLY 80 A n 81 81 A n 82 82 A 0.192 author_defined_assembly 1 monomeric A CYS 8 A SG CYS 8 1_555 A SF4 101 B FE3 SF4 1_555 A SF4 101 B S1 SF4 1_555 99.8 A CYS 8 A SG CYS 8 1_555 A SF4 101 B FE3 SF4 1_555 A SF4 101 B S2 SF4 1_555 124.6 A SF4 101 B S1 SF4 1_555 A SF4 101 B FE3 SF4 1_555 A SF4 101 B S2 SF4 1_555 100.4 A CYS 8 A SG CYS 8 1_555 A SF4 101 B FE3 SF4 1_555 A SF4 101 B S4 SF4 1_555 119.9 A SF4 101 B S1 SF4 1_555 A SF4 101 B FE3 SF4 1_555 A SF4 101 B S4 SF4 1_555 100.6 A SF4 101 B S2 SF4 1_555 A SF4 101 B FE3 SF4 1_555 A SF4 101 B S4 SF4 1_555 106.0 A CYS 11 A SG CYS 11 1_555 A SF4 101 B FE4 SF4 1_555 A SF4 101 B S1 SF4 1_555 121.2 A CYS 11 A SG CYS 11 1_555 A SF4 101 B FE4 SF4 1_555 A SF4 101 B S2 SF4 1_555 113.1 A SF4 101 B S1 SF4 1_555 A SF4 101 B FE4 SF4 1_555 A SF4 101 B S2 SF4 1_555 103.8 A CYS 11 A SG CYS 11 1_555 A SF4 101 B FE4 SF4 1_555 A SF4 101 B S3 SF4 1_555 108.9 A SF4 101 B S1 SF4 1_555 A SF4 101 B FE4 SF4 1_555 A SF4 101 B S3 SF4 1_555 104.1 A SF4 101 B S2 SF4 1_555 A SF4 101 B FE4 SF4 1_555 A SF4 101 B S3 SF4 1_555 104.3 A CYS 14 A SG CYS 14 1_555 A SF4 101 B FE2 SF4 1_555 A SF4 101 B S1 SF4 1_555 117.8 A CYS 14 A SG CYS 14 1_555 A SF4 101 B FE2 SF4 1_555 A SF4 101 B S3 SF4 1_555 112.3 A SF4 101 B S1 SF4 1_555 A SF4 101 B FE2 SF4 1_555 A SF4 101 B S3 SF4 1_555 105.3 A CYS 14 A SG CYS 14 1_555 A SF4 101 B FE2 SF4 1_555 A SF4 101 B S4 SF4 1_555 117.7 A SF4 101 B S1 SF4 1_555 A SF4 101 B FE2 SF4 1_555 A SF4 101 B S4 SF4 1_555 102.9 A SF4 101 B S3 SF4 1_555 A SF4 101 B FE2 SF4 1_555 A SF4 101 B S4 SF4 1_555 98.5 A CYS 18 A SG CYS 18 1_555 A SF4 102 C FE1 SF4 1_555 A SF4 102 C S2 SF4 1_555 109.5 A CYS 18 A SG CYS 18 1_555 A SF4 102 C FE1 SF4 1_555 A SF4 102 C S3 SF4 1_555 112.8 A SF4 102 C S2 SF4 1_555 A SF4 102 C FE1 SF4 1_555 A SF4 102 C S3 SF4 1_555 106.7 A CYS 18 A SG CYS 18 1_555 A SF4 102 C FE1 SF4 1_555 A SF4 102 C S4 SF4 1_555 117.3 A SF4 102 C S2 SF4 1_555 A SF4 102 C FE1 SF4 1_555 A SF4 102 C S4 SF4 1_555 107.7 A SF4 102 C S3 SF4 1_555 A SF4 102 C FE1 SF4 1_555 A SF4 102 C S4 SF4 1_555 102.1 A CYS 37 A SG CYS 37 1_555 A SF4 102 C FE3 SF4 1_555 A SF4 102 C S1 SF4 1_555 110.3 A CYS 37 A SG CYS 37 1_555 A SF4 102 C FE3 SF4 1_555 A SF4 102 C S2 SF4 1_555 114.7 A SF4 102 C S1 SF4 1_555 A SF4 102 C FE3 SF4 1_555 A SF4 102 C S2 SF4 1_555 101.9 A CYS 37 A SG CYS 37 1_555 A SF4 102 C FE3 SF4 1_555 A SF4 102 C S4 SF4 1_555 117.4 A SF4 102 C S1 SF4 1_555 A SF4 102 C FE3 SF4 1_555 A SF4 102 C S4 SF4 1_555 106.1 A SF4 102 C S2 SF4 1_555 A SF4 102 C FE3 SF4 1_555 A SF4 102 C S4 SF4 1_555 105.0 A CYS 40 A SG CYS 40 1_555 A SF4 102 C FE4 SF4 1_555 A SF4 102 C S1 SF4 1_555 121.6 A CYS 40 A SG CYS 40 1_555 A SF4 102 C FE4 SF4 1_555 A SF4 102 C S2 SF4 1_555 124.8 A SF4 102 C S1 SF4 1_555 A SF4 102 C FE4 SF4 1_555 A SF4 102 C S2 SF4 1_555 103.4 A CYS 40 A SG CYS 40 1_555 A SF4 102 C FE4 SF4 1_555 A SF4 102 C S3 SF4 1_555 97.5 A SF4 102 C S1 SF4 1_555 A SF4 102 C FE4 SF4 1_555 A SF4 102 C S3 SF4 1_555 100.5 A SF4 102 C S2 SF4 1_555 A SF4 102 C FE4 SF4 1_555 A SF4 102 C S3 SF4 1_555 104.2 A CYS 49 A SG CYS 49 1_555 A SF4 102 C FE2 SF4 1_555 A SF4 102 C S1 SF4 1_555 108.9 A CYS 49 A SG CYS 49 1_555 A SF4 102 C FE2 SF4 1_555 A SF4 102 C S3 SF4 1_555 115.4 A SF4 102 C S1 SF4 1_555 A SF4 102 C FE2 SF4 1_555 A SF4 102 C S3 SF4 1_555 101.5 A CYS 49 A SG CYS 49 1_555 A SF4 102 C FE2 SF4 1_555 A SF4 102 C S4 SF4 1_555 119.0 A SF4 102 C S1 SF4 1_555 A SF4 102 C FE2 SF4 1_555 A SF4 102 C S4 SF4 1_555 108.1 A SF4 102 C S3 SF4 1_555 A SF4 102 C FE2 SF4 1_555 A SF4 102 C S4 SF4 1_555 102.4 A CYS 53 A SG CYS 53 1_555 A SF4 101 B FE1 SF4 1_555 A SF4 101 B S2 SF4 1_555 115.9 A CYS 53 A SG CYS 53 1_555 A SF4 101 B FE1 SF4 1_555 A SF4 101 B S3 SF4 1_555 108.4 A SF4 101 B S2 SF4 1_555 A SF4 101 B FE1 SF4 1_555 A SF4 101 B S3 SF4 1_555 104.9 A CYS 53 A SG CYS 53 1_555 A SF4 101 B FE1 SF4 1_555 A SF4 101 B S4 SF4 1_555 118.8 A SF4 101 B S2 SF4 1_555 A SF4 101 B FE1 SF4 1_555 A SF4 101 B S4 SF4 1_555 106.9 A SF4 101 B S3 SF4 1_555 A SF4 101 B FE1 SF4 1_555 A SF4 101 B S4 SF4 1_555 100.0 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 O MET 3 A O MET 3 A N ASP 61 A N ASP 61 A O ALA 22 A O ALA 22 A N GLU 33 A N GLU 33 1 A GLU 81 A GLU 81 1 Y 1 A GLY 82 A GLY 82 1 Y 1 6.54 0.90 118.30 124.84 A A A CB CG OD1 ASP ASP ASP 12 12 12 N 1 13.79 2.00 110.40 124.19 A A A CB CA C ASP ASP ASP 27 27 27 N 1 7.80 1.10 114.20 122.00 A A A CA CB SG CYS CYS CYS 40 40 40 N 1 5.56 0.90 118.30 123.86 A A A CB CG OD2 ASP ASP ASP 56 56 56 N 1 7.75 1.10 114.20 121.95 A A A CA CB SG CYS CYS CYS 57 57 57 N 1 -5.99 0.50 120.30 114.31 A A A NE CZ NH1 ARG ARG ARG 72 72 72 N 1 3.86 0.50 120.30 124.16 A A A NE CZ NH2 ARG ARG ARG 72 72 72 N 1 -4.02 0.50 120.30 116.28 A A A NE CZ NH2 ARG ARG ARG 77 77 77 N 1 A ASP 12 76.51 -11.69 2.1 20.0 7178 97.0 1 0. MR 1FDX 0.25 2.1 20.0 85 713 16 0 612 0.021 0.020 0.043 0.030 0.050 0.050 3.4 3.0 5.2 5.0 5.9 4.0 9.5 6.0 0.016 0.020 0.211 0.150 0.210 0.300 0.272 0.300 0.212 0.300 3.0 5.0 19.6 15.0 12.0 20.0 2.1 20. 1BLU 7178 0.0 0.081 1 5.0 97.0 phasing AMoRE refinement PROLSQ data reduction DENZO data scaling SCALEPACK STRUCTURE OF THE 2[4FE-4S] FERREDOXIN FROM CHROMATIUM VINOSUM 1 N N 2 N N 2 N N 3 N N A SER 47 A SER 47 HELX_P A VAL 52 A VAL 52 5 H1 6 A ASP 69 A ASP 69 HELX_P A GLY 80 A GLY 80 1 H2 12 metalc 2.285 A CYS 8 A SG CYS 8 1_555 A SF4 101 B FE3 SF4 1_555 metalc 2.195 A CYS 11 A SG CYS 11 1_555 A SF4 101 B FE4 SF4 1_555 metalc 2.297 A CYS 14 A SG CYS 14 1_555 A SF4 101 B FE2 SF4 1_555 metalc 2.220 A CYS 18 A SG CYS 18 1_555 A SF4 102 C FE1 SF4 1_555 metalc 2.360 A CYS 37 A SG CYS 37 1_555 A SF4 102 C FE3 SF4 1_555 metalc 2.335 A CYS 40 A SG CYS 40 1_555 A SF4 102 C FE4 SF4 1_555 metalc 2.221 A CYS 49 A SG CYS 49 1_555 A SF4 102 C FE2 SF4 1_555 metalc 2.189 A CYS 53 A SG CYS 53 1_555 A SF4 101 B FE1 SF4 1_555 ELECTRON TRANSPORT ELECTRON TRANSPORT, FERREDOXIN FER_CHRVI UNP 1 1 P00208 ALMITDECINCDVCEPECPNGAISQGDETYVIEPSLCTECVGHYETSQCVEVCPVDCIIKDPSHEETEDELRAKYERITG EG 1 82 1BLU 1 82 P00208 A 1 1 82 2 2 anti-parallel anti-parallel A ALA 1 A ALA 1 A MET 3 A MET 3 A ILE 59 A ILE 59 A ASP 61 A ASP 61 A ALA 22 A ALA 22 A GLY 26 A GLY 26 A THR 29 A THR 29 A GLU 33 A GLU 33 BINDING SITE FOR RESIDUE SF4 A 101 A SF4 101 Software 10 BINDING SITE FOR RESIDUE SF4 A 102 A SF4 102 Software 6 A CYS 8 A CYS 8 10 1_555 A ILE 9 A ILE 9 10 1_555 A CYS 11 A CYS 11 10 1_555 A ASP 12 A ASP 12 10 1_555 A CYS 14 A CYS 14 10 1_555 A TYR 30 A TYR 30 10 1_555 A CYS 53 A CYS 53 10 1_555 A PRO 54 A PRO 54 10 1_555 A CYS 57 A CYS 57 10 1_555 A ILE 58 A ILE 58 10 1_555 A CYS 18 A CYS 18 6 1_555 A ILE 23 A ILE 23 6 1_555 A CYS 37 A CYS 37 6 1_555 A CYS 40 A CYS 40 6 1_555 A SER 47 A SER 47 6 1_555 A CYS 49 A CYS 49 6 1_555 152 P 31 2 1