1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 0.00000 0.00000 0.00000 Wang, X. http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic 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 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 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 51 8353 8362 10.1021/bi3007093 22985470 Solution structure of decorin-binding protein A from Borrelia burgdorferi. 2012 10.2210/pdb2lqu/pdb pdb_00002lqu 18555.178 Decorin-binding protein A UNP residues 26-191 C25A 1 man polymer no no SAGLTGATKIRLERSAKDITDEIDAIKKDAALKGVNFDAFKDKKTGSGVSENPFILEAKVRATTVAEKFVIAIEEEATKL KETGSSGEFSAMYDLMFEVSKPLQKLGIQEMTKTVSDAAEENPPTTAQGVLEIAKKMREKLQRVHTKNYCTLKKKENSTF TDEKCKNN SAGLTGATKIRLERSAKDITDEIDAIKKDAALKGVNFDAFKDKKTGSGVSENPFILEAKVRATTVAEKFVIAIEEEATKL KETGSSGEFSAMYDLMFEVSKPLQKLGIQEMTKTVSDAAEENPPTTAQGVLEIAKKMREKLQRVHTKNYCTLKKKENSTF TDEKCKNN 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 n n n n n n n n n n Lyme disease spirochete B31 sample BB_A24, dbpA 139 Borrelia burgdorferi 469008 Escherichia coli B21 DE3 pHUE database_2 pdbx_database_status pdbx_nmr_software struct_ref_seq_dif repository Initial release Data collection Database references Other 1 0 2013-01-16 1 1 2023-06-14 _database_2.pdbx_DOI _database_2.pdbx_database_accession _pdbx_database_status.status_code_nmr_data _pdbx_nmr_software.name _struct_ref_seq_dif.details BMRB Y RCSB 2012-03-14 REL REL REL REL 1288 198 452 396 242 105 105 0.3 structures with the least restraint violations 100 10 10 0.49 0.05 2D 1H-15N HSQC 3D HNCACB 3D CBCA(CO)NH 3D 1H-15N NOESY 3D 1H-13C NOESY aliphatic 3D HCCH-TOCSY J-modulated 15N HSQC JNC-modulated 15N HSQC 0.8 mM [U-100% 13C; U-100% 15N] 50 mM 10 % 0.8 mM [U-100% 13C; U-100% 15N] 50 mM 10 % 5 % 0.05 6.5 ambient 298 K XPLOR-NIH refinement with RDCs torsion angle dynamics 1 fewest violations 0.8 mM [U-100% 13C; U-100% 15N] DBPA, 50 mM sodium phosphate, 10 % D2O, 90% H2O/10% D2O 90% H2O/10% D2O 0.8 mM [U-100% 13C; U-100% 15N] DBPA, 50 mM sodium phosphate, 10 % D2O, 5 % polyacrylamide, 90% H2O/10% D2O 90% H2O/10% D2O Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax processing NMRPipe Johnson, One Moon Scientific data analysis NMRView Schwieters, Kuszewski, Tjandra and Clore refinement X-PLOR NIH 800 Agilent Inova 800 Agilent Inova 800 SER 24 n 1 SER 24 A ALA 25 n 2 ALA 25 A GLY 26 n 3 GLY 26 A LEU 27 n 4 LEU 27 A THR 28 n 5 THR 28 A GLY 29 n 6 GLY 29 A ALA 30 n 7 ALA 30 A THR 31 n 8 THR 31 A LYS 32 n 9 LYS 32 A ILE 33 n 10 ILE 33 A ARG 34 n 11 ARG 34 A LEU 35 n 12 LEU 35 A GLU 36 n 13 GLU 36 A ARG 37 n 14 ARG 37 A SER 38 n 15 SER 38 A ALA 39 n 16 ALA 39 A LYS 40 n 17 LYS 40 A ASP 41 n 18 ASP 41 A ILE 42 n 19 ILE 42 A THR 43 n 20 THR 43 A ASP 44 n 21 ASP 44 A GLU 45 n 22 GLU 45 A ILE 46 n 23 ILE 46 A ASP 47 n 24 ASP 47 A ALA 48 n 25 ALA 48 A ILE 49 n 26 ILE 49 A LYS 50 n 27 LYS 50 A LYS 51 n 28 LYS 51 A ASP 52 n 29 ASP 52 A ALA 53 n 30 ALA 53 A ALA 54 n 31 ALA 54 A LEU 55 n 32 LEU 55 A LYS 56 n 33 LYS 56 A GLY 57 n 34 GLY 57 A VAL 58 n 35 VAL 58 A ASN 59 n 36 ASN 59 A PHE 60 n 37 PHE 60 A ASP 61 n 38 ASP 61 A ALA 62 n 39 ALA 62 A PHE 63 n 40 PHE 63 A LYS 64 n 41 LYS 64 A ASP 65 n 42 ASP 65 A LYS 66 n 43 LYS 66 A LYS 67 n 44 LYS 67 A THR 68 n 45 THR 68 A GLY 69 n 46 GLY 69 A SER 70 n 47 SER 70 A GLY 71 n 48 GLY 71 A VAL 72 n 49 VAL 72 A SER 73 n 50 SER 73 A GLU 74 n 51 GLU 74 A ASN 75 n 52 ASN 75 A PRO 76 n 53 PRO 76 A PHE 77 n 54 PHE 77 A ILE 78 n 55 ILE 78 A LEU 79 n 56 LEU 79 A GLU 80 n 57 GLU 80 A ALA 81 n 58 ALA 81 A LYS 82 n 59 LYS 82 A VAL 83 n 60 VAL 83 A ARG 84 n 61 ARG 84 A ALA 85 n 62 ALA 85 A THR 86 n 63 THR 86 A THR 87 n 64 THR 87 A VAL 88 n 65 VAL 88 A ALA 89 n 66 ALA 89 A GLU 90 n 67 GLU 90 A LYS 91 n 68 LYS 91 A PHE 92 n 69 PHE 92 A VAL 93 n 70 VAL 93 A ILE 94 n 71 ILE 94 A ALA 95 n 72 ALA 95 A ILE 96 n 73 ILE 96 A GLU 97 n 74 GLU 97 A GLU 98 n 75 GLU 98 A GLU 99 n 76 GLU 99 A ALA 100 n 77 ALA 100 A THR 101 n 78 THR 101 A LYS 102 n 79 LYS 102 A LEU 103 n 80 LEU 103 A LYS 104 n 81 LYS 104 A GLU 105 n 82 GLU 105 A THR 106 n 83 THR 106 A GLY 107 n 84 GLY 107 A SER 108 n 85 SER 108 A SER 109 n 86 SER 109 A GLY 110 n 87 GLY 110 A GLU 111 n 88 GLU 111 A PHE 112 n 89 PHE 112 A SER 113 n 90 SER 113 A ALA 114 n 91 ALA 114 A MET 115 n 92 MET 115 A TYR 116 n 93 TYR 116 A ASP 117 n 94 ASP 117 A LEU 118 n 95 LEU 118 A MET 119 n 96 MET 119 A PHE 120 n 97 PHE 120 A GLU 121 n 98 GLU 121 A VAL 122 n 99 VAL 122 A SER 123 n 100 SER 123 A LYS 124 n 101 LYS 124 A PRO 125 n 102 PRO 125 A LEU 126 n 103 LEU 126 A GLN 127 n 104 GLN 127 A LYS 128 n 105 LYS 128 A LEU 129 n 106 LEU 129 A GLY 130 n 107 GLY 130 A ILE 131 n 108 ILE 131 A GLN 132 n 109 GLN 132 A GLU 133 n 110 GLU 133 A MET 134 n 111 MET 134 A THR 135 n 112 THR 135 A LYS 136 n 113 LYS 136 A THR 137 n 114 THR 137 A VAL 138 n 115 VAL 138 A SER 139 n 116 SER 139 A ASP 140 n 117 ASP 140 A ALA 141 n 118 ALA 141 A ALA 142 n 119 ALA 142 A GLU 143 n 120 GLU 143 A GLU 144 n 121 GLU 144 A ASN 145 n 122 ASN 145 A PRO 146 n 123 PRO 146 A PRO 147 n 124 PRO 147 A THR 148 n 125 THR 148 A THR 149 n 126 THR 149 A ALA 150 n 127 ALA 150 A GLN 151 n 128 GLN 151 A GLY 152 n 129 GLY 152 A VAL 153 n 130 VAL 153 A LEU 154 n 131 LEU 154 A GLU 155 n 132 GLU 155 A ILE 156 n 133 ILE 156 A ALA 157 n 134 ALA 157 A LYS 158 n 135 LYS 158 A LYS 159 n 136 LYS 159 A MET 160 n 137 MET 160 A ARG 161 n 138 ARG 161 A GLU 162 n 139 GLU 162 A LYS 163 n 140 LYS 163 A LEU 164 n 141 LEU 164 A GLN 165 n 142 GLN 165 A ARG 166 n 143 ARG 166 A VAL 167 n 144 VAL 167 A HIS 168 n 145 HIS 168 A THR 169 n 146 THR 169 A LYS 170 n 147 LYS 170 A ASN 171 n 148 ASN 171 A TYR 172 n 149 TYR 172 A CYS 173 n 150 CYS 173 A THR 174 n 151 THR 174 A LEU 175 n 152 LEU 175 A LYS 176 n 153 LYS 176 A LYS 177 n 154 LYS 177 A LYS 178 n 155 LYS 178 A GLU 179 n 156 GLU 179 A ASN 180 n 157 ASN 180 A SER 181 n 158 SER 181 A THR 182 n 159 THR 182 A PHE 183 n 160 PHE 183 A THR 184 n 161 THR 184 A ASP 185 n 162 ASP 185 A GLU 186 n 163 GLU 186 A LYS 187 n 164 LYS 187 A CYS 188 n 165 CYS 188 A LYS 189 n 166 LYS 189 A ASN 190 n 167 ASN 190 A ASN 191 n 168 ASN 191 A 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 2 A A O H PHE ALA 60 62 1.38 2 A A O H THR SER 135 139 1.49 2 A A O H GLY ILE 29 33 1.60 3 A A O H PRO THR 146 148 1.48 3 A A O H LYS GLN 124 127 1.57 5 A A HG HZ1 SER LYS 70 177 1.21 5 A A O O LEU LYS 103 104 1.57 6 A A HE HZ2 ARG LYS 166 170 1.34 7 A A HG1 HZ2 THR LYS 137 163 1.28 8 A A O H LYS ASP 136 140 1.58 9 A A O H LEU ALA 35 39 1.60 10 A A O H LEU LEU 126 129 1.56 10 A A O H GLU THR 133 137 1.56 10 A A O H LEU GLU 103 105 1.58 1 A ALA 25 -68.21 82.29 1 A LEU 27 -141.20 -44.90 1 A THR 28 40.37 -149.10 1 A PHE 60 52.88 72.93 1 A ASP 61 172.23 -99.00 1 A ASP 65 49.79 -94.79 1 A SER 70 53.43 80.70 1 A SER 73 70.61 -59.24 1 A GLU 74 -68.75 91.92 1 A ASN 75 -18.82 98.33 1 A PRO 76 -51.05 0.03 1 A LYS 104 -25.52 -50.31 1 A GLU 105 -47.72 165.34 1 A THR 106 55.29 -75.90 1 A SER 108 70.31 138.06 1 A ILE 131 -105.81 -71.56 1 A GLU 133 -88.09 44.44 1 A PRO 146 -42.79 105.41 1 A PRO 147 -45.26 101.66 1 A SER 181 51.07 -97.08 1 A THR 182 -72.04 -115.85 1 A PHE 183 41.75 83.69 1 A THR 184 -80.08 35.72 1 A ASP 185 -157.32 79.89 1 A CYS 188 60.38 69.53 2 A LEU 27 -88.67 38.79 2 A THR 28 -35.80 -32.83 2 A ASP 61 60.99 -51.21 2 A ALA 62 60.99 81.88 2 A LYS 64 -149.84 -60.18 2 A ASP 65 -159.73 -23.64 2 A THR 68 -105.19 -85.88 2 A SER 70 -174.68 135.02 2 A VAL 72 -116.77 -88.10 2 A GLU 74 168.00 -175.11 2 A LYS 104 -23.31 -47.00 2 A GLU 105 -53.96 -154.27 2 A ILE 131 21.79 81.78 2 A GLN 132 -106.51 74.88 2 A GLU 133 174.81 -6.81 2 A GLU 143 -60.48 -119.47 2 A GLU 144 18.54 -82.98 2 A THR 148 -77.88 22.05 2 A THR 182 -60.44 96.12 2 A GLU 186 -136.63 -49.18 2 A LYS 187 54.84 105.24 2 A LYS 189 46.63 -104.16 2 A ASN 190 -125.23 -69.41 3 A LEU 27 -17.95 136.09 3 A THR 28 -152.03 45.33 3 A ALA 30 77.93 -20.77 3 A LEU 55 -12.98 80.96 3 A LYS 56 8.77 67.50 3 A PHE 60 50.96 176.54 3 A ALA 62 -155.94 80.95 3 A SER 70 -169.51 -133.86 3 A VAL 72 -39.03 157.77 3 A SER 73 56.01 -95.84 3 A GLU 74 -49.98 96.47 3 A ASN 75 -22.32 111.03 3 A PRO 76 -51.14 -1.22 3 A LYS 104 4.40 -124.71 3 A GLU 105 -56.98 -162.31 3 A THR 106 32.21 31.23 3 A LYS 128 -55.01 -6.11 3 A ILE 131 85.70 -20.91 3 A GLN 132 -8.19 -145.58 3 A GLU 133 51.53 4.44 3 A GLU 144 -179.45 -21.76 3 A ASN 145 -173.04 68.31 3 A PRO 146 -37.39 118.27 3 A PRO 147 -59.98 39.86 3 A THR 148 -65.61 0.39 3 A ASN 180 -108.48 64.39 3 A ASP 185 57.82 108.60 3 A LYS 189 60.47 151.12 4 A LEU 27 55.71 106.79 4 A THR 28 -171.84 -119.27 4 A ALA 30 73.16 -30.22 4 A VAL 58 -90.43 55.68 4 A ASN 59 47.38 -175.50 4 A PHE 60 -172.20 -53.68 4 A ALA 62 -69.08 68.19 4 A ASP 65 61.98 -73.07 4 A LYS 66 -68.03 98.90 4 A THR 68 44.75 95.71 4 A SER 70 -156.05 -136.30 4 A VAL 72 61.56 -69.53 4 A GLU 74 -92.01 -65.86 4 A ASN 75 -176.86 118.19 4 A GLU 105 -170.20 -61.02 4 A SER 108 -172.16 -150.01 4 A SER 109 -163.43 -77.34 4 A LEU 129 -93.72 -65.65 4 A ILE 131 52.01 -114.58 4 A GLN 132 97.15 55.40 4 A GLU 133 -170.42 -21.38 4 A GLU 143 -59.39 -123.49 4 A GLU 144 26.05 -81.09 4 A PRO 146 -43.67 106.73 4 A PRO 147 -48.48 81.78 4 A SER 181 74.55 -49.07 4 A PHE 183 -135.72 -50.99 4 A LYS 187 -171.69 149.52 4 A CYS 188 -75.94 -138.66 4 A LYS 189 30.39 55.63 4 A ASN 190 -153.88 81.59 5 A ALA 25 -170.91 -28.13 5 A THR 28 44.15 70.97 5 A ALA 30 76.42 -69.36 5 A ASP 61 -57.74 -161.00 5 A ALA 62 70.93 -45.85 5 A LYS 64 -151.46 -70.71 5 A ASP 65 -161.69 -67.72 5 A LYS 66 -60.10 90.40 5 A SER 70 55.35 165.30 5 A SER 73 58.96 148.85 5 A GLU 74 39.81 105.41 5 A ASN 75 -31.01 140.50 5 A LYS 104 -5.58 -148.85 5 A THR 106 -164.27 8.97 5 A SER 108 156.32 -103.90 5 A SER 109 -172.19 -56.40 5 A ILE 131 21.83 94.23 5 A GLU 133 79.57 -12.17 5 A ASN 145 -159.75 83.92 5 A PRO 146 -47.13 106.36 5 A SER 181 44.91 -152.19 5 A THR 182 52.11 176.52 5 A ASP 185 -142.80 21.40 5 A CYS 188 -77.48 39.94 6 A ALA 25 -161.12 67.89 6 A LEU 27 35.41 31.77 6 A THR 28 -45.95 -119.93 6 A ALA 30 -57.49 -4.69 6 A LYS 56 -177.13 -17.93 6 A VAL 58 57.40 155.72 6 A ASP 61 61.36 -118.00 6 A ALA 62 61.20 -121.51 6 A PHE 63 58.15 91.18 6 A LYS 64 -113.03 -149.01 6 A THR 68 -174.61 2.35 6 A SER 70 62.23 141.00 6 A GLU 74 69.96 -67.78 6 A LEU 103 -81.29 -92.39 6 A LYS 104 78.92 -38.58 6 A SER 109 70.88 -49.50 6 A LEU 129 -57.52 -110.37 6 A GLU 133 75.48 -21.91 6 A GLU 144 175.78 -37.93 6 A PRO 146 -38.70 106.47 6 A PRO 147 -55.17 10.27 6 A THR 148 -55.38 -2.65 6 A SER 181 49.99 -82.74 6 A PHE 183 -174.20 -81.62 6 A THR 184 53.16 -173.69 6 A ASN 190 -44.77 92.54 7 A ALA 25 -171.32 -58.38 7 A LEU 27 47.86 -162.25 7 A THR 28 -169.53 -129.47 7 A ALA 30 -169.23 -13.24 7 A ASN 59 -69.29 78.19 7 A PHE 63 -163.91 102.80 7 A ASP 65 -45.67 -19.54 7 A SER 70 -164.82 -149.67 7 A VAL 72 -79.03 -101.18 7 A SER 73 63.48 -65.97 7 A ASN 75 89.52 137.54 7 A LYS 104 -68.15 73.83 7 A GLU 105 -172.31 48.16 7 A SER 108 -172.51 -166.82 7 A SER 109 -147.07 -57.88 7 A ILE 131 54.26 -150.38 7 A GLN 132 179.99 138.15 7 A PRO 146 -48.72 109.59 7 A ASN 180 -90.47 51.28 7 A ASP 185 -96.62 -123.05 7 A LYS 187 -66.27 -76.15 7 A CYS 188 -177.10 -62.24 7 A LYS 189 -164.57 116.39 8 A ALA 25 51.64 -177.40 8 A THR 28 -176.26 -31.60 8 A PHE 60 -142.44 -59.11 8 A ALA 62 -132.77 -95.14 8 A PHE 63 52.35 99.09 8 A LYS 66 57.27 114.28 8 A SER 73 50.90 101.90 8 A GLU 74 152.34 -22.28 8 A ASN 75 88.03 85.39 8 A PRO 76 -59.30 18.62 8 A LYS 104 -24.33 -44.13 8 A GLU 105 -56.75 -148.11 8 A SER 108 72.89 129.83 8 A ILE 131 -3.46 88.46 8 A GLU 133 106.22 -19.40 8 A GLU 144 -177.64 -61.23 8 A PRO 146 -34.24 98.78 8 A PRO 147 -51.48 74.20 8 A THR 148 -73.17 21.43 8 A ASN 180 -96.09 -90.10 8 A SER 181 166.16 -67.05 8 A THR 184 -145.40 45.49 8 A ASP 185 -163.46 42.05 9 A ALA 25 52.27 -104.31 9 A THR 28 -59.88 98.64 9 A ALA 30 164.50 -69.65 9 A ALA 62 -143.42 -82.19 9 A LYS 67 -119.85 -84.44 9 A THR 68 66.39 -15.42 9 A SER 70 64.25 88.06 9 A VAL 72 -130.82 -31.94 9 A GLU 74 -135.29 -145.05 9 A THR 106 178.00 31.32 9 A SER 108 70.50 -171.48 9 A LEU 129 -97.86 -67.62 9 A ILE 131 53.28 -158.41 9 A GLN 132 177.43 139.52 9 A ASN 180 -147.16 -13.13 9 A SER 181 70.35 -16.39 9 A PHE 183 -167.41 -16.57 9 A THR 184 -49.91 -16.63 9 A CYS 188 -171.13 -5.34 9 A ASN 190 53.86 -108.31 10 A THR 28 -174.34 -173.33 10 A ALA 30 68.48 -20.30 10 A ALA 62 -150.37 -15.07 10 A PHE 63 -18.99 95.05 10 A LYS 64 -65.55 -81.84 10 A ASP 65 -156.05 -99.38 10 A THR 68 28.11 58.86 10 A SER 70 -160.05 90.01 10 A SER 73 172.88 -57.32 10 A ASN 75 163.54 98.38 10 A PRO 76 -43.79 -19.94 10 A LYS 104 -66.25 62.70 10 A GLU 105 -113.12 -70.12 10 A SER 108 -56.63 -109.07 10 A SER 109 -171.39 -60.06 10 A GLN 132 -25.84 122.90 10 A GLU 133 148.22 -21.95 10 A PRO 147 -45.79 87.61 10 A ASN 180 -99.18 -84.64 10 A SER 181 171.90 -101.55 10 A THR 182 -150.03 39.43 10 A ASP 185 -159.21 -66.21 10 A LYS 187 -144.91 11.62 fewest violations, model 1 Structure of decorbin-binding protein A from Borrelia burgdorferi 1 N N A ALA 30 A ALA 7 HELX_P A LYS 56 A LYS 33 1 1 27 A ASN 75 A ASN 52 HELX_P A LYS 104 A LYS 81 1 2 30 A GLY 107 A GLY 84 HELX_P A GLY 130 A GLY 107 1 3 24 A GLU 133 A GLU 110 HELX_P A ASN 145 A ASN 122 1 4 13 A THR 149 A THR 126 HELX_P A LYS 176 A LYS 153 1 5 28 A LYS 176 A LYS 153 HELX_P A SER 181 A SER 158 1 6 6 disulf 2.021 A CYS 173 A SG CYS 150 1_555 A CYS 188 A SG CYS 165 1_555 CELL ADHESION GAG-binding protein, helical bundle protein, Lyme disease, bacterial adhesin, CELL ADHESION DBPA_BORBU UNP 1 24 O50917 SCGLTGATKIRLERSAKDITDEIDAIKKDAALKGVNFDAFKDKKTGSGVSENPFILEAKVRATTVAEKFVIAIEEEATKL KETGSSGEFSAMYDLMFEVSKPLQKLGIQEMTKTVSDAAEENPPTTAQGVLEIAKKMREKLQRVHTKNYCTLKKKENSTF TDEKCKNN 24 191 2LQU 24 191 O50917 A 1 1 168 1 CYS engineered mutation ALA 25 2LQU A O50917 UNP 25 2