0.017895 0.000000 0.000000 0.000000 0.017895 0.000000 0.000000 0.000000 0.010373 0.00000 0.00000 0.00000 Gao-Sheridan, H.S. Kemper, M.A. Khayat, R. Armstrong, F.A. Prasad, G.S. Sridhar, V. Stout, C.D. Burgess, B.K. http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic 8 90.00 90.00 90.00 55.880 55.880 96.400 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 Fe3 S4 295.795 FE3-S4 CLUSTER non-polymer 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 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 Fe4 S4 351.640 IRON/SULFUR CLUSTER non-polymer 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 J.Biol.Chem. JBCHA3 0071 0021-9258 273 33692 33701 10.1074/jbc.273.50.33692 9837955 A T14C variant of Azotobacter vinelandii ferredoxin I undergoes facile [3Fe-4S]0 to [4Fe-4S]2+ conversion in vitro but not in vivo. 1998 10.2210/pdb1a6l/pdb pdb_00001a6l 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 0.00000 0.00000 0.00000 291 1 MONOCHROMATOR AREA DETECTOR 1998-01 SIEMENS GRAPHITE(002) M x-ray 1 1.5418 1.0 1.5418 ROTATING ANODE RIGAKU RUH2R 12061.569 FERREDOXIN T14C 1 man polymer 351.640 IRON/SULFUR CLUSTER 1 syn non-polymer 295.795 FE3-S4 CLUSTER 1 syn non-polymer 18.015 water 48 nat water no no AFVVTDNCIKCKYCDCVEVCPVDCFYEGPNFLVIHPDECIDCALCEPECPAQAIFSEDEVPEDMQEFIQLNAELAEVWPN ITEKKDPLPDAEDWDGVKGKLQHLER AFVVTDNCIKCKYCDCVEVCPVDCFYEGPNFLVIHPDECIDCALCEPECPAQAIFSEDEVPEDMQEFIQLNAELAEVWPN ITEKKDPLPDAEDWDGVKGKLQHLER 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 Azotobacter JG100 Azotobacter sample JG100 354 Azotobacter vinelandii JG100 354 Azotobacter vinelandii DJ138/PBS3A1 1 2.9 55. 7.8 pH 7.8 database_2 pdbx_database_status pdbx_struct_conn_angle struct_conn struct_ref_seq_dif struct_site pdbx_initial_refinement_model repository Initial release Version format compliance Version format compliance Database references Derived calculations Other Refinement description 1 0 1998-05-27 1 1 2008-03-28 1 2 2011-07-13 1 3 2021-11-03 1 4 2023-08-02 _database_2.pdbx_DOI _database_2.pdbx_database_accession _pdbx_database_status.process_site _pdbx_struct_conn_angle.ptnr1_auth_comp_id _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_comp_id _pdbx_struct_conn_angle.ptnr1_label_seq_id _pdbx_struct_conn_angle.ptnr2_auth_comp_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.ptnr2_label_comp_id _pdbx_struct_conn_angle.ptnr3_auth_comp_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.ptnr3_label_comp_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_ref_seq_dif.details _struct_site.pdbx_auth_asym_id _struct_site.pdbx_auth_comp_id _struct_site.pdbx_auth_seq_id Y BNL 1998-02-26 REL SF4 IRON/SULFUR CLUSTER F3S FE3-S4 CLUSTER HOH water 6FD1 PDB ENTRY 6FD1 PDB experimental model FS4 107 2 SF4 SF4 107 A FS3 108 3 F3S F3S 108 A HOH 109 4 HOH HOH 109 A HOH 110 4 HOH HOH 110 A HOH 111 4 HOH HOH 111 A HOH 112 4 HOH HOH 112 A HOH 113 4 HOH HOH 113 A HOH 114 4 HOH HOH 114 A HOH 115 4 HOH HOH 115 A HOH 116 4 HOH HOH 116 A HOH 117 4 HOH HOH 117 A HOH 118 4 HOH HOH 118 A HOH 119 4 HOH HOH 119 A HOH 120 4 HOH HOH 120 A HOH 121 4 HOH HOH 121 A HOH 122 4 HOH HOH 122 A HOH 123 4 HOH HOH 123 A HOH 124 4 HOH HOH 124 A HOH 125 4 HOH HOH 125 A HOH 126 4 HOH HOH 126 A HOH 127 4 HOH HOH 127 A HOH 128 4 HOH HOH 128 A HOH 129 4 HOH HOH 129 A HOH 130 4 HOH HOH 130 A HOH 131 4 HOH HOH 131 A HOH 132 4 HOH HOH 132 A HOH 133 4 HOH HOH 133 A HOH 134 4 HOH HOH 134 A HOH 135 4 HOH HOH 135 A HOH 136 4 HOH HOH 136 A HOH 137 4 HOH HOH 137 A HOH 138 4 HOH HOH 138 A HOH 139 4 HOH HOH 139 A HOH 140 4 HOH HOH 140 A HOH 141 4 HOH HOH 141 A HOH 142 4 HOH HOH 142 A HOH 143 4 HOH HOH 143 A HOH 144 4 HOH HOH 144 A HOH 145 4 HOH HOH 145 A HOH 146 4 HOH HOH 146 A HOH 147 4 HOH HOH 147 A HOH 148 4 HOH HOH 148 A HOH 149 4 HOH HOH 149 A HOH 150 4 HOH HOH 150 A HOH 151 4 HOH HOH 151 A HOH 152 4 HOH HOH 152 A HOH 153 4 HOH HOH 153 A HOH 154 4 HOH HOH 154 A HOH 155 4 HOH HOH 155 A HOH 156 4 HOH HOH 156 A ALA 1 n 1 ALA 1 A PHE 2 n 2 PHE 2 A VAL 3 n 3 VAL 3 A VAL 4 n 4 VAL 4 A THR 5 n 5 THR 5 A ASP 6 n 6 ASP 6 A ASN 7 n 7 ASN 7 A CYS 8 n 8 CYS 8 A ILE 9 n 9 ILE 9 A LYS 10 n 10 LYS 10 A CYS 11 n 11 CYS 11 A LYS 12 n 12 LYS 12 A TYR 13 n 13 TYR 13 A CYS 14 n 14 CYS 14 A ASP 15 n 15 ASP 15 A CYS 16 n 16 CYS 16 A VAL 17 n 17 VAL 17 A GLU 18 n 18 GLU 18 A VAL 19 n 19 VAL 19 A CYS 20 n 20 CYS 20 A PRO 21 n 21 PRO 21 A VAL 22 n 22 VAL 22 A ASP 23 n 23 ASP 23 A CYS 24 n 24 CYS 24 A PHE 25 n 25 PHE 25 A TYR 26 n 26 TYR 26 A GLU 27 n 27 GLU 27 A GLY 28 n 28 GLY 28 A PRO 29 n 29 PRO 29 A ASN 30 n 30 ASN 30 A PHE 31 n 31 PHE 31 A LEU 32 n 32 LEU 32 A VAL 33 n 33 VAL 33 A ILE 34 n 34 ILE 34 A HIS 35 n 35 HIS 35 A PRO 36 n 36 PRO 36 A ASP 37 n 37 ASP 37 A GLU 38 n 38 GLU 38 A CYS 39 n 39 CYS 39 A ILE 40 n 40 ILE 40 A ASP 41 n 41 ASP 41 A CYS 42 n 42 CYS 42 A ALA 43 n 43 ALA 43 A LEU 44 n 44 LEU 44 A CYS 45 n 45 CYS 45 A GLU 46 n 46 GLU 46 A PRO 47 n 47 PRO 47 A GLU 48 n 48 GLU 48 A CYS 49 n 49 CYS 49 A PRO 50 n 50 PRO 50 A ALA 51 n 51 ALA 51 A GLN 52 n 52 GLN 52 A ALA 53 n 53 ALA 53 A ILE 54 n 54 ILE 54 A PHE 55 n 55 PHE 55 A SER 56 n 56 SER 56 A GLU 57 n 57 GLU 57 A ASP 58 n 58 ASP 58 A GLU 59 n 59 GLU 59 A VAL 60 n 60 VAL 60 A PRO 61 n 61 PRO 61 A GLU 62 n 62 GLU 62 A ASP 63 n 63 ASP 63 A MET 64 n 64 MET 64 A GLN 65 n 65 GLN 65 A GLU 66 n 66 GLU 66 A PHE 67 n 67 PHE 67 A ILE 68 n 68 ILE 68 A GLN 69 n 69 GLN 69 A LEU 70 n 70 LEU 70 A ASN 71 n 71 ASN 71 A ALA 72 n 72 ALA 72 A GLU 73 n 73 GLU 73 A LEU 74 n 74 LEU 74 A ALA 75 n 75 ALA 75 A GLU 76 n 76 GLU 76 A VAL 77 n 77 VAL 77 A TRP 78 n 78 TRP 78 A PRO 79 n 79 PRO 79 A ASN 80 n 80 ASN 80 A ILE 81 n 81 ILE 81 A THR 82 n 82 THR 82 A GLU 83 n 83 GLU 83 A LYS 84 n 84 LYS 84 A LYS 85 n 85 LYS 85 A ASP 86 n 86 ASP 86 A PRO 87 n 87 PRO 87 A LEU 88 n 88 LEU 88 A PRO 89 n 89 PRO 89 A ASP 90 n 90 ASP 90 A ALA 91 n 91 ALA 91 A GLU 92 n 92 GLU 92 A ASP 93 n 93 ASP 93 A TRP 94 n 94 TRP 94 A ASP 95 n 95 ASP 95 A GLY 96 n 96 GLY 96 A VAL 97 n 97 VAL 97 A LYS 98 n 98 LYS 98 A GLY 99 n 99 GLY 99 A LYS 100 n 100 LYS 100 A LEU 101 n 101 LEU 101 A GLN 102 n 102 GLN 102 A HIS 103 n 103 HIS 103 A LEU 104 n 104 LEU 104 A GLU 105 n 105 GLU 105 A ARG 106 n 106 ARG 106 A author_defined_assembly 1 monomeric A CYS 8 A SG CYS 8 1_555 A F3S 108 C FE3 F3S 1_555 A F3S 108 C S1 F3S 1_555 111.4 A CYS 8 A SG CYS 8 1_555 A F3S 108 C FE3 F3S 1_555 A F3S 108 C S3 F3S 1_555 115.3 A F3S 108 C S1 F3S 1_555 A F3S 108 C FE3 F3S 1_555 A F3S 108 C S3 F3S 1_555 106.0 A CYS 8 A SG CYS 8 1_555 A F3S 108 C FE3 F3S 1_555 A F3S 108 C S4 F3S 1_555 107.0 A F3S 108 C S1 F3S 1_555 A F3S 108 C FE3 F3S 1_555 A F3S 108 C S4 F3S 1_555 111.2 A F3S 108 C S3 F3S 1_555 A F3S 108 C FE3 F3S 1_555 A F3S 108 C S4 F3S 1_555 105.8 A CYS 16 A SG CYS 16 1_555 A F3S 108 C FE1 F3S 1_555 A F3S 108 C S1 F3S 1_555 113.5 A CYS 16 A SG CYS 16 1_555 A F3S 108 C FE1 F3S 1_555 A F3S 108 C S2 F3S 1_555 105.5 A F3S 108 C S1 F3S 1_555 A F3S 108 C FE1 F3S 1_555 A F3S 108 C S2 F3S 1_555 108.2 A CYS 16 A SG CYS 16 1_555 A F3S 108 C FE1 F3S 1_555 A F3S 108 C S3 F3S 1_555 117.5 A F3S 108 C S1 F3S 1_555 A F3S 108 C FE1 F3S 1_555 A F3S 108 C S3 F3S 1_555 105.3 A F3S 108 C S2 F3S 1_555 A F3S 108 C FE1 F3S 1_555 A F3S 108 C S3 F3S 1_555 106.5 A CYS 20 A SG CYS 20 1_555 A SF4 107 B FE4 SF4 1_555 A SF4 107 B S1 SF4 1_555 110.2 A CYS 20 A SG CYS 20 1_555 A SF4 107 B FE4 SF4 1_555 A SF4 107 B S2 SF4 1_555 116.7 A SF4 107 B S1 SF4 1_555 A SF4 107 B FE4 SF4 1_555 A SF4 107 B S2 SF4 1_555 106.3 A CYS 20 A SG CYS 20 1_555 A SF4 107 B FE4 SF4 1_555 A SF4 107 B S3 SF4 1_555 110.4 A SF4 107 B S1 SF4 1_555 A SF4 107 B FE4 SF4 1_555 A SF4 107 B S3 SF4 1_555 106.2 A SF4 107 B S2 SF4 1_555 A SF4 107 B FE4 SF4 1_555 A SF4 107 B S3 SF4 1_555 106.5 A CYS 39 A SG CYS 39 1_555 A SF4 107 B FE1 SF4 1_555 A SF4 107 B S2 SF4 1_555 118.8 A CYS 39 A SG CYS 39 1_555 A SF4 107 B FE1 SF4 1_555 A SF4 107 B S3 SF4 1_555 114.9 A SF4 107 B S2 SF4 1_555 A SF4 107 B FE1 SF4 1_555 A SF4 107 B S3 SF4 1_555 105.9 A CYS 39 A SG CYS 39 1_555 A SF4 107 B FE1 SF4 1_555 A SF4 107 B S4 SF4 1_555 103.5 A SF4 107 B S2 SF4 1_555 A SF4 107 B FE1 SF4 1_555 A SF4 107 B S4 SF4 1_555 107.4 A SF4 107 B S3 SF4 1_555 A SF4 107 B FE1 SF4 1_555 A SF4 107 B S4 SF4 1_555 105.2 A CYS 42 A SG CYS 42 1_555 A SF4 107 B FE2 SF4 1_555 A SF4 107 B S1 SF4 1_555 97.7 A CYS 42 A SG CYS 42 1_555 A SF4 107 B FE2 SF4 1_555 A SF4 107 B S3 SF4 1_555 119.3 A SF4 107 B S1 SF4 1_555 A SF4 107 B FE2 SF4 1_555 A SF4 107 B S3 SF4 1_555 107.8 A CYS 42 A SG CYS 42 1_555 A SF4 107 B FE2 SF4 1_555 A SF4 107 B S4 SF4 1_555 117.1 A SF4 107 B S1 SF4 1_555 A SF4 107 B FE2 SF4 1_555 A SF4 107 B S4 SF4 1_555 106.1 A SF4 107 B S3 SF4 1_555 A SF4 107 B FE2 SF4 1_555 A SF4 107 B S4 SF4 1_555 107.3 A CYS 45 A SG CYS 45 1_555 A SF4 107 B FE3 SF4 1_555 A SF4 107 B S1 SF4 1_555 109.1 A CYS 45 A SG CYS 45 1_555 A SF4 107 B FE3 SF4 1_555 A SF4 107 B S2 SF4 1_555 118.6 A SF4 107 B S1 SF4 1_555 A SF4 107 B FE3 SF4 1_555 A SF4 107 B S2 SF4 1_555 106.4 A CYS 45 A SG CYS 45 1_555 A SF4 107 B FE3 SF4 1_555 A SF4 107 B S4 SF4 1_555 108.9 A SF4 107 B S1 SF4 1_555 A SF4 107 B FE3 SF4 1_555 A SF4 107 B S4 SF4 1_555 105.0 A SF4 107 B S2 SF4 1_555 A SF4 107 B FE3 SF4 1_555 A SF4 107 B S4 SF4 1_555 108.0 A CYS 49 A SG CYS 49 1_555 A F3S 108 C FE4 F3S 1_555 A F3S 108 C S2 F3S 1_555 116.9 A CYS 49 A SG CYS 49 1_555 A F3S 108 C FE4 F3S 1_555 A F3S 108 C S3 F3S 1_555 110.1 A F3S 108 C S2 F3S 1_555 A F3S 108 C FE4 F3S 1_555 A F3S 108 C S3 F3S 1_555 105.9 A CYS 49 A SG CYS 49 1_555 A F3S 108 C FE4 F3S 1_555 A F3S 108 C S4 F3S 1_555 109.1 A F3S 108 C S2 F3S 1_555 A F3S 108 C FE4 F3S 1_555 A F3S 108 C S4 F3S 1_555 108.8 A F3S 108 C S3 F3S 1_555 A F3S 108 C FE4 F3S 1_555 A F3S 108 C S4 F3S 1_555 105.3 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 VAL 3 A O VAL 3 A N PHE 55 A N PHE 55 A O TYR 26 A O TYR 26 A N VAL 33 A N VAL 33 1 5.39 0.80 106.30 111.69 A A A CD1 CG CD2 TRP TRP TRP 78 78 78 N 1 -5.37 0.80 107.30 101.93 A A A CE2 CD2 CG TRP TRP TRP 78 78 78 N 1 6.57 0.80 106.30 112.87 A A A CD1 CG CD2 TRP TRP TRP 94 94 94 N 1 -5.60 0.80 107.30 101.70 A A A CE2 CD2 CG TRP TRP TRP 94 94 94 N 1 A A NE2 CD2 HIS HIS 103 103 -0.072 0.011 1.373 1.301 N 1 A THR 5 -111.36 -169.47 1 A CYS 14 58.88 15.48 1 A GLN 52 38.88 49.04 PARAM19X.PRO TOPH19X.PRO 21.0 0.206 0.206 2.10 8.0 8225 92.0 1 RESTRAINED 0.0 MOLECULAR REPLACEMENT PDB ENTRY 6FD1 2.10 8.0 48 903 15 0 840 0.014 3.09 1.48 2.10 20.0 1A6L 8686 0.0 0.061 0.061 1 18.8 3.9 92.0 0.218 2.10 2.24 2.7 0.218 2.33 60.0 model building X-PLOR 3.8 refinement X-PLOR 3.8 data reduction XENGEN data scaling XENGEN phasing X-PLOR 3.8 T14C MUTANT OF AZOTOBACTER VINELANDII FDI 1 N N 2 N N 3 N N 4 N N A ASP 6 A ASP 6 HELX_P A CYS 8 A CYS 8 5 1 3 A ASP 15 A ASP 15 HELX_P A VAL 19 A VAL 19 5 2 5 A LEU 44 A LEU 44 HELX_P A GLU 48 A GLU 48 1 3 5 A GLU 57 A GLU 57 HELX_P A GLU 59 A GLU 59 5 4 3 A GLU 62 A GLU 62 HELX_P A VAL 77 A VAL 77 5 5 16 A ALA 91 A ALA 91 HELX_P A TRP 94 A TRP 94 1 6 4 A LYS 100 A LYS 100 HELX_P A HIS 103 A HIS 103 5 7 4 metalc 2.290 A CYS 8 A SG CYS 8 1_555 A F3S 108 C FE3 F3S 1_555 metalc 2.289 A CYS 16 A SG CYS 16 1_555 A F3S 108 C FE1 F3S 1_555 metalc 2.310 A CYS 20 A SG CYS 20 1_555 A SF4 107 B FE4 SF4 1_555 metalc 2.260 A CYS 39 A SG CYS 39 1_555 A SF4 107 B FE1 SF4 1_555 metalc 2.286 A CYS 42 A SG CYS 42 1_555 A SF4 107 B FE2 SF4 1_555 metalc 2.292 A CYS 45 A SG CYS 45 1_555 A SF4 107 B FE3 SF4 1_555 metalc 2.256 A CYS 49 A SG CYS 49 1_555 A F3S 108 C FE4 F3S 1_555 ELECTRON TRANSPORT ELECTRON TRANSPORT, IRON-SULFUR FER1_AZOVI UNP 1 1 P00214 AFVVTDNCIKCKYTDCVEVCPVDCFYEGPNFLVIHPDECIDCALCEPECPAQAIFSEDEVPEDMQEFIQLNAELAEVWPN ITEKKDPLPDAEDWDGVKGKLQHLER 1 106 1A6L 1 106 P00214 A 1 1 106 1 THR engineered mutation CYS 14 1A6L A P00214 UNP 14 14 2 2 anti-parallel anti-parallel A PHE 2 A PHE 2 A VAL 4 A VAL 4 A ILE 54 A ILE 54 A SER 56 A SER 56 A PHE 25 A PHE 25 A GLU 27 A GLU 27 A LEU 32 A LEU 32 A ILE 34 A ILE 34 BINDING SITE FOR RESIDUE SF4 A 107 A SF4 107 Software 11 BINDING SITE FOR RESIDUE F3S A 108 A F3S 108 Software 10 A PHE 2 A PHE 2 11 1_555 A CYS 20 A CYS 20 11 1_555 A VAL 22 A VAL 22 11 1_555 A CYS 24 A CYS 24 11 1_555 A PHE 25 A PHE 25 11 1_555 A ILE 34 A ILE 34 11 1_555 A CYS 39 A CYS 39 11 1_555 A ILE 40 A ILE 40 11 1_555 A CYS 42 A CYS 42 11 1_555 A ALA 43 A ALA 43 11 1_555 A CYS 45 A CYS 45 11 1_555 A VAL 4 A VAL 4 10 1_555 A CYS 8 A CYS 8 10 1_555 A LYS 12 A LYS 12 10 1_555 A TYR 13 A TYR 13 10 1_555 A CYS 14 A CYS 14 10 1_555 A ASP 15 A ASP 15 10 1_555 A CYS 16 A CYS 16 10 1_555 A LEU 32 A LEU 32 10 1_555 A CYS 49 A CYS 49 10 1_555 A ILE 54 A ILE 54 10 1_555 92 P 41 21 2