0.018235 0.000000 0.000000 0.000000 0.017062 0.000000 0.000000 0.000000 0.014821 0.00000 0.00000 0.00000 SEE REMARK 4. AN OCCUPANCY OF 0.0 INDICATES THAT NO SIGNIFICANT ELECTRON DENSITY WAS FOUND IN THE FINAL FOURIER MAP. Kossiakoff, A.A. http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic 4 90.00 90.00 90.00 54.840 58.610 67.470 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 C3 H9 O4 P 140.075 PHOSPHORYLISOPROPANE non-polymer 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 US Basic Life Sci. BLFSBY 0658 0090-5542 27 281 304 6712567 Use of the neutron diffraction--H/D exchange technique to determine the conformational dynamics of trypsin 1984 UK Nature NATUAS 0006 0028-0836 296 713 Protein Dynamics Investigated by the Neutron Diffraction-Hydrogen Exchange Technique 1982 US Biochemistry BICHAW 0033 0006-2960 20 6462 Direct Determination of the Protonation States of Aspartic Acid-102 and Histidine-57 in the Tetrahedral Intermediate of the Serine Proteases. Neutron Structure of Trypsin 1981 UK Nature NATUAS 0006 0028-0836 288 414 Neutron Diffraction Identifies His 57 as the Catalytic Base in Trypsin 1980 DK Acta Crystallogr.,Sect.B ASBSDK 0622 0108-7681 35 1861 The Accuracy of Refined Protein Structures, Comparison of Two Independently Refined Models of Bovine Trypsin 1979 DK Acta Crystallogr.,Sect.B ASBSDK 0622 0108-7681 33 1824 Difference-Fourier Refinement of the Structure of Dip-Trypsin at 1.5 Angstroms Using a Minicomputer Technique 1977 Cold Spring Harbor Lab.,Cold Spring Harbor,N.Y. Proteases and Biological Control 0988 0-87969-144-X 13 Structure-Function Relationships in the Serine Proteases 1975 US Biochem.Biophys.Res.Commun. BBRCA9 0146 0006-291X 59 70 Silver Ion Inhibition of Serine Proteases, Crystallographic Study of Silver-Trypsin 1974 UK J.Mol.Biol. JMOBAK 0070 0022-2836 83 185 The Structure of Bovine Trypsin,Electron Density Maps of the Inhibited Enzyme at 5 Angstroms and at 2.7 Angstroms Resolution 1974 UK J.Mol.Biol. JMOBAK 0070 0022-2836 83 209 Structure and Specific Binding of Trypsin, Comparison of Inhibited Derivatives and a Model for Substrate Binding 1974 US Cold Spring Harbor Symp.Quant.Biol. CSHSAZ 0421 0091-7451 36 125 The Crystal and Molecular Structure of Dip-Inhibited Bovine Trypsin at 2.7 Angstroms Resolution 1972 1 2 3 0.018235 0.000000 0.000000 0.000000 0.017062 0.000000 0.000000 0.000000 0.014821 0.00000 0.00000 0.00000 1 neutron 1 1.0 23327.242 BETA-TRYPSIN 3.4.21.4 1 man polymer 140.075 PHOSPHORYLISOPROPANE 1 syn non-polymer no no IVGGYTCGANTVPYQVSLNSGYHFCGGSLIDSQWVVSAAHCYKSGIQVRLGEDNINVVEGNEQFISASKSIVHPSYDSNT LNNDIMLIKLKSAASLDSRVASISLPTSCASAGTQCLISGWGNTKSSGTSYPDVLKCLKAPILSDSSCKSAYPGQITSNM FCAGYLEGGKDSCQGDSGGPVVCSGKLQGIVSWGSGCAQKNKPGVYTKVCNYVSWIKQTIASN IVGGYTCGANTVPYQVSLNSGYHFCGGSLIDSQWVVSAAHCYKSGIQVRLGEDNINVVEGNEQFISASKSIVHPSYDSNT LNNDIMLIKLKSAASLDSRVASISLPTSCASAGTQCLISGWGNTKSSGTSYPDVLKCLKAPILSDSSCKSAYPGQITSNM FCAGYLEGGKDSCQGDSGGPVVCSGKLQGIVSWGSGCAQKNKPGVYTKVCNYVSWIKQTIASN 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 n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n cattle Bos sample 9913 Bos taurus pdbx_database_status struct_conf struct_conf_type repository Initial release Version format compliance Version format compliance Derived calculations Other 1 0 1988-01-16 1 1 2008-03-03 1 2 2011-07-13 1 3 2017-11-29 _pdbx_database_status.process_site Y BNL 1987-09-16 REL ISP PHOSPHORYLISOPROPANE THE ENZYME IS INHIBITED BY A MONOISOPROPYLPHOSPHORYL DERIVATIVE. THE REFINED STRUCTURE IN THIS REGION LOOKS VERY MUCH LIKE THAT EXPECTED FOR THE TETRAHEDRAL INTERMEDIATE IN THE REACTION SEQUENCE. THE NE2 OF HIS 57 IS HYDROGEN-BONDED TO O1A OF THE ISP GROUP, WHICH CORRESPONDS TO THE LEAVING GROUP NITROGEN OF A SPECIFIC SUBSTRATE. ISP 1 2 ISP ISP 1 A ILE 16 n 1 ILE 16 A VAL 17 n 2 VAL 17 A GLY 18 n 3 GLY 18 A GLY 19 n 4 GLY 19 A TYR 20 n 5 TYR 20 A THR 21 n 6 THR 21 A CYS 22 n 7 CYS 22 A GLY 23 n 8 GLY 23 A ALA 24 n 9 ALA 24 A ASN 25 n 10 ASN 25 A THR 26 n 11 THR 26 A VAL 27 n 12 VAL 27 A PRO 28 n 13 PRO 28 A TYR 29 n 14 TYR 29 A GLN 30 n 15 GLN 30 A VAL 31 n 16 VAL 31 A SER 32 n 17 SER 32 A LEU 33 n 18 LEU 33 A ASN 34 n 19 ASN 34 A SER 37 n 20 SER 37 A GLY 38 n 21 GLY 38 A TYR 39 n 22 TYR 39 A HIS 40 n 23 HIS 40 A PHE 41 n 24 PHE 41 A CYS 42 n 25 CYS 42 A GLY 43 n 26 GLY 43 A GLY 44 n 27 GLY 44 A SER 45 n 28 SER 45 A LEU 46 n 29 LEU 46 A ILE 47 n 30 ILE 47 A ASP 48 n 31 ASP 48 A SER 49 n 32 SER 49 A GLN 50 n 33 GLN 50 A TRP 51 n 34 TRP 51 A VAL 52 n 35 VAL 52 A VAL 53 n 36 VAL 53 A SER 54 n 37 SER 54 A ALA 55 n 38 ALA 55 A ALA 56 n 39 ALA 56 A HIS 57 n 40 HIS 57 A CYS 58 n 41 CYS 58 A TYR 59 n 42 TYR 59 A LYS 60 n 43 LYS 60 A SER 61 n 44 SER 61 A GLY 62 n 45 GLY 62 A ILE 63 n 46 ILE 63 A GLN 64 n 47 GLN 64 A VAL 65 n 48 VAL 65 A ARG 65 n 49 A ARG 65 A LEU 66 n 50 LEU 66 A GLY 69 n 51 GLY 69 A GLU 70 n 52 GLU 70 A ASP 71 n 53 ASP 71 A ASN 72 n 54 ASN 72 A ILE 73 n 55 ILE 73 A ASN 74 n 56 ASN 74 A VAL 75 n 57 VAL 75 A VAL 76 n 58 VAL 76 A GLU 77 n 59 GLU 77 A GLY 78 n 60 GLY 78 A ASN 79 n 61 ASN 79 A GLU 80 n 62 GLU 80 A GLN 81 n 63 GLN 81 A PHE 82 n 64 PHE 82 A ILE 83 n 65 ILE 83 A SER 84 n 66 SER 84 A ALA 85 n 67 ALA 85 A SER 86 n 68 SER 86 A LYS 87 n 69 LYS 87 A SER 88 n 70 SER 88 A ILE 89 n 71 ILE 89 A VAL 90 n 72 VAL 90 A HIS 91 n 73 HIS 91 A PRO 92 n 74 PRO 92 A SER 93 n 75 SER 93 A TYR 94 n 76 TYR 94 A ASP 95 n 77 ASP 95 A SER 96 n 78 SER 96 A ASN 97 n 79 ASN 97 A THR 98 n 80 THR 98 A LEU 99 n 81 LEU 99 A ASN 100 n 82 ASN 100 A ASN 101 n 83 ASN 101 A ASP 102 n 84 ASP 102 A ILE 103 n 85 ILE 103 A MET 104 n 86 MET 104 A LEU 105 n 87 LEU 105 A ILE 106 n 88 ILE 106 A LYS 107 n 89 LYS 107 A LEU 108 n 90 LEU 108 A LYS 109 n 91 LYS 109 A SER 110 n 92 SER 110 A ALA 111 n 93 ALA 111 A ALA 112 n 94 ALA 112 A SER 113 n 95 SER 113 A LEU 114 n 96 LEU 114 A ASP 115 n 97 ASP 115 A SER 116 n 98 SER 116 A ARG 117 n 99 ARG 117 A VAL 118 n 100 VAL 118 A ALA 119 n 101 ALA 119 A SER 120 n 102 SER 120 A ILE 121 n 103 ILE 121 A SER 122 n 104 SER 122 A LEU 123 n 105 LEU 123 A PRO 124 n 106 PRO 124 A THR 125 n 107 THR 125 A SER 127 n 108 SER 127 A CYS 128 n 109 CYS 128 A ALA 129 n 110 ALA 129 A SER 130 n 111 SER 130 A ALA 132 n 112 ALA 132 A GLY 133 n 113 GLY 133 A THR 134 n 114 THR 134 A GLN 135 n 115 GLN 135 A CYS 136 n 116 CYS 136 A LEU 137 n 117 LEU 137 A ILE 138 n 118 ILE 138 A SER 139 n 119 SER 139 A GLY 140 n 120 GLY 140 A TRP 141 n 121 TRP 141 A GLY 142 n 122 GLY 142 A ASN 143 n 123 ASN 143 A THR 144 n 124 THR 144 A LYS 145 n 125 LYS 145 A SER 146 n 126 SER 146 A SER 147 n 127 SER 147 A GLY 148 n 128 GLY 148 A THR 149 n 129 THR 149 A SER 150 n 130 SER 150 A TYR 151 n 131 TYR 151 A PRO 152 n 132 PRO 152 A ASP 153 n 133 ASP 153 A VAL 154 n 134 VAL 154 A LEU 155 n 135 LEU 155 A LYS 156 n 136 LYS 156 A CYS 157 n 137 CYS 157 A LEU 158 n 138 LEU 158 A LYS 159 n 139 LYS 159 A ALA 160 n 140 ALA 160 A PRO 161 n 141 PRO 161 A ILE 162 n 142 ILE 162 A LEU 163 n 143 LEU 163 A SER 164 n 144 SER 164 A ASP 165 n 145 ASP 165 A SER 166 n 146 SER 166 A SER 167 n 147 SER 167 A CYS 168 n 148 CYS 168 A LYS 169 n 149 LYS 169 A SER 170 n 150 SER 170 A ALA 171 n 151 ALA 171 A TYR 172 n 152 TYR 172 A PRO 173 n 153 PRO 173 A GLY 174 n 154 GLY 174 A GLN 175 n 155 GLN 175 A ILE 176 n 156 ILE 176 A THR 177 n 157 THR 177 A SER 178 n 158 SER 178 A ASN 179 n 159 ASN 179 A MET 180 n 160 MET 180 A PHE 181 n 161 PHE 181 A CYS 182 n 162 CYS 182 A ALA 183 n 163 ALA 183 A GLY 184 n 164 GLY 184 A TYR 184 n 165 A TYR 184 A LEU 185 n 166 LEU 185 A GLU 186 n 167 GLU 186 A GLY 187 n 168 GLY 187 A GLY 188 n 169 GLY 188 A LYS 188 n 170 A LYS 188 A ASP 189 n 171 ASP 189 A SER 190 n 172 SER 190 A CYS 191 n 173 CYS 191 A GLN 192 n 174 GLN 192 A GLY 193 n 175 GLY 193 A ASP 194 n 176 ASP 194 A SER 195 n 177 SER 195 A GLY 196 n 178 GLY 196 A GLY 197 n 179 GLY 197 A PRO 198 n 180 PRO 198 A VAL 199 n 181 VAL 199 A VAL 200 n 182 VAL 200 A CYS 201 n 183 CYS 201 A SER 202 n 184 SER 202 A GLY 203 n 185 GLY 203 A LYS 204 n 186 LYS 204 A LEU 209 n 187 LEU 209 A GLN 210 n 188 GLN 210 A GLY 211 n 189 GLY 211 A ILE 212 n 190 ILE 212 A VAL 213 n 191 VAL 213 A SER 214 n 192 SER 214 A TRP 215 n 193 TRP 215 A GLY 216 n 194 GLY 216 A SER 217 n 195 SER 217 A GLY 219 n 196 GLY 219 A CYS 220 n 197 CYS 220 A ALA 221 n 198 ALA 221 A GLN 221 n 199 A GLN 221 A LYS 222 n 200 LYS 222 A ASN 223 n 201 ASN 223 A LYS 224 n 202 LYS 224 A PRO 225 n 203 PRO 225 A GLY 226 n 204 GLY 226 A VAL 227 n 205 VAL 227 A TYR 228 n 206 TYR 228 A THR 229 n 207 THR 229 A LYS 230 n 208 LYS 230 A VAL 231 n 209 VAL 231 A CYS 232 n 210 CYS 232 A ASN 233 n 211 ASN 233 A TYR 234 n 212 TYR 234 A VAL 235 n 213 VAL 235 A SER 236 n 214 SER 236 A TRP 237 n 215 TRP 237 A ILE 238 n 216 ILE 238 A LYS 239 n 217 LYS 239 A GLN 240 n 218 GLN 240 A THR 241 n 219 THR 241 A ILE 242 n 220 ILE 242 A ALA 243 n 221 ALA 243 A SER 244 n 222 SER 244 A ASN 245 n 223 ASN 245 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 A N TYR 20 A N TYR 5 A O CYS 157 A O CYS 137 A N LEU 158 A N LEU 138 A O ILE 138 A O ILE 118 A O LEU 137 A O LEU 117 A N VAL 200 A N VAL 182 A O GLY 197 A O GLY 179 A N VAL 213 A N VAL 191 A O ILE 212 A O ILE 190 A N THR 229 A N THR 207 A O TYR 228 A O TYR 206 A N PHE 181 A N PHE 161 A O SER 45 A O SER 28 A N VAL 53 A N VAL 36 A N SER 54 A N SER 37 A O MET 104 A O MET 86 A O ILE 103 A O ILE 85 A N HIS 91 A N HIS 73 A O LEU 66 A O LEU 50 A N GLN 81 A N GLN 63 1 A O2P ISP 1 B O2P ISP 1 1 N 1 A A OG P SER ISP 195 1 1.52 1 A A DZ1 OD1 LYS ASN 87 245 1.56 A 1 A A OE1 DZ3 GLN LYS 221 222 1.59 1 A A OD1 DH22 ASN ARG 25 117 1.59 1 A TYR 39 0.122 SIDE CHAIN 1 A TYR 59 0.071 SIDE CHAIN 1 6.69 1.10 114.20 120.89 A A A CA CB SG CYS CYS CYS 22 22 22 N 1 -14.94 2.00 110.40 95.46 A A A CB CA C GLN GLN GLN 50 50 50 N 1 8.98 1.10 117.90 126.88 A A A CD1 CG CD2 TYR TYR TYR 59 59 59 N 1 -9.12 0.60 121.00 111.88 A A A CB CG CD1 TYR TYR TYR 59 59 59 N 1 -6.72 0.80 121.30 114.58 A A A CG CD1 CE1 TYR TYR TYR 59 59 59 N 1 -6.46 0.80 121.30 114.84 A A A CG CD2 CE2 TYR TYR TYR 59 59 59 N 1 -10.42 1.70 123.20 112.78 A A A O C N SER SER GLY 61 61 62 Y A A A 1 -3.07 0.50 120.30 117.23 A A A NE CZ NH1 ARG ARG ARG 65 65 65 N 1 -13.05 1.20 123.30 110.25 A A A OE1 CD OE2 GLU GLU GLU 80 80 80 N 1 6.92 1.10 117.90 124.82 A A A CD1 CG CD2 TYR TYR TYR 94 94 94 N 1 -3.94 0.60 121.00 117.06 A A A CB CG CD1 TYR TYR TYR 94 94 94 N 1 -16.67 1.90 123.30 106.63 A A A OD1 CG OD2 ASP ASP ASP 102 102 102 N 1 9.24 0.90 118.30 127.54 A A A CB CG OD1 ASP ASP ASP 102 102 102 N 1 7.51 0.90 118.30 125.81 A A A CB CG OD2 ASP ASP ASP 102 102 102 N 1 -14.98 1.10 119.40 104.42 A A A NH1 CZ NH2 ARG ARG ARG 117 117 117 N 1 3.97 0.50 120.30 124.27 A A A NE CZ NH1 ARG ARG ARG 117 117 117 N 1 11.00 0.50 120.30 131.30 A A A NE CZ NH2 ARG ARG ARG 117 117 117 N 1 9.72 1.60 122.70 132.42 A A A O C N THR THR SER 125 125 127 Y 1 -4.11 0.60 121.00 116.89 A A A CB CG CD1 TYR TYR TYR 151 151 151 N 1 -14.09 2.20 117.20 103.11 A A A CA C N SER SER ASP 164 164 165 Y 1 12.27 1.60 122.70 134.97 A A A O C N SER SER ASP 164 164 165 Y 1 -11.50 1.80 110.60 99.10 A A A N CA CB ASP ASP ASP 165 165 165 N 1 15.68 2.20 113.40 129.08 A A A CA CB CG ASP ASP ASP 165 165 165 N 1 -13.41 1.90 123.30 109.89 A A A OD1 CG OD2 ASP ASP ASP 165 165 165 N 1 9.44 0.90 118.30 127.74 A A A CB CG OD2 ASP ASP ASP 165 165 165 N 1 10.27 1.50 110.50 120.77 A A A N CA CB SER SER SER 170 170 170 N 1 -6.30 0.60 121.00 114.70 A A A CB CG CD2 TYR TYR TYR 172 172 172 N 1 6.86 1.10 117.90 124.76 A A A CD1 CG CD2 TYR TYR TYR 172 172 172 N 1 -6.05 0.80 121.30 115.25 A A A CG CD1 CE1 TYR TYR TYR 172 172 172 N 1 -5.59 0.80 121.30 115.71 A A A CG CD2 CE2 TYR TYR TYR 172 172 172 N 1 9.94 1.60 100.20 110.14 A A A CG SD CE MET MET MET 180 180 180 N A A A 1 7.81 0.90 119.80 127.61 A A A CD1 CE1 CZ TYR TYR TYR 184 184 184 N 1 -11.56 1.70 123.20 111.64 A A A O C N GLU GLU GLY 186 186 187 Y 1 -5.42 0.90 118.30 112.88 A A A CB CG OD1 ASP ASP ASP 189 189 189 N 1 19.36 2.60 111.60 130.96 A A A CB CG CD GLN GLN GLN 192 192 192 N 1 -11.72 1.90 123.30 111.58 A A A OD1 CG OD2 ASP ASP ASP 194 194 194 N 1 5.54 0.90 118.30 123.84 A A A CB CG OD1 ASP ASP ASP 194 194 194 N 1 6.25 0.90 118.30 124.55 A A A CB CG OD2 ASP ASP ASP 194 194 194 N 1 9.82 1.60 122.70 132.52 A A A O C N LYS LYS LEU 204 204 209 Y 1 10.71 1.60 122.70 133.41 A A A O C N GLY GLY ILE 211 211 212 Y 1 -14.22 1.80 110.60 96.38 A A A N CA CB LYS LYS LYS 222 222 222 N 1 A A NE1 CE2 TRP TRP 51 51 -0.078 0.013 1.371 1.293 N 1 A A CA CB SER SER 61 61 0.094 0.015 1.525 1.619 N 1 A A CD OE1 GLU GLU 70 70 0.091 0.011 1.252 1.343 N 1 A A NE1 CE2 TRP TRP 237 237 -0.093 0.013 1.371 1.278 N 1 A A DZ1 DG LYS SER 107 130 1.29 1_555 2_565 1 A SER 54 -143.26 -158.60 1 A ASP 71 -122.09 -83.10 1 A SER 150 -162.37 114.91 1 A LYS 222 -36.96 129.33 1 A ASN 223 72.81 -7.86 0.187 1.8 1 1.8 0 3230 14 0 3216 0.013 2.3 MODIFIED BETA TRYPSIN (MONOISOPROPYLPHOSPHORYL INHIBITED) (E.C.3.4.21.4) (NEUTRON DATA) USE OF THE NEUTRON DIFFRACTION H/D EXCHANGE TECHNIQUE TO DETERMINE THE CONFORMATIONAL DYNAMICS OF TRYPSIN 1 N N 2 N N A SER 164 A SER 144 HELX_P IRREGULAR AFTER CYS 168 A TYR 172 A TYR 152 1 SHO 9 A LYS 230 A LYS 208 HELX_P LEADS INTO TERMINAL ALPHA-HLX A VAL 235 A VAL 213 5 310 6 A TYR 234 A TYR 212 HELX_P C-TERMINAL HELIX A ASN 245 A ASN 223 1 TER 12 disulf 1.874 A CYS 22 A SG CYS 7 1_555 A CYS 157 A SG CYS 137 1_555 disulf 1.944 A CYS 42 A SG CYS 25 1_555 A CYS 58 A SG CYS 41 1_555 disulf 2.174 A CYS 128 A SG CYS 109 1_555 A CYS 232 A SG CYS 210 1_555 disulf 2.073 A CYS 136 A SG CYS 116 1_555 A CYS 201 A SG CYS 183 1_555 disulf 1.778 A CYS 168 A SG CYS 148 1_555 A CYS 182 A SG CYS 162 1_555 disulf 2.188 A CYS 191 A SG CYS 173 1_555 A CYS 220 A SG CYS 197 1_555 HYDROLASE (SERINE PROTEINASE) HYDROLASE (SERINE PROTEINASE) TRY1_BOVIN UNP 1 1 P00760 FIFLALLGAAVAFPVDDDDKIVGGYTCGANTVPYQVSLNSGYHFCGGSLINSQWVVSAAHCYKSGIQVRLGEDNINVVEG NEQFISASKSIVHPSYNSNTLNNDIMLIKLKSAASLNSRVASISLPTSCASAGTQCLISGWGNTKSSGTSYPDVLKCLKA PILSDSSCKSAYPGQITSNMFCAGYLEGGKDSCQGDSGGPVVCSGKLQGIVSWGSGCAQKNKPGVYTKVCNYVSWIKQTI ASN 21 243 1NTP 16 245 P00760 A 1 1 223 1 ASN CONFLICT ASP 48 1NTP A P00760 UNP 51 31 1 ASN CONFLICT ASP 95 1NTP A P00760 UNP 97 77 1 ASN CONFLICT ASP 115 1NTP A P00760 UNP 117 97 7 4 2 anti-parallel anti-parallel anti-parallel anti-parallel anti-parallel anti-parallel anti-parallel anti-parallel anti-parallel anti-parallel A TYR 20 A TYR 5 A TYR 20 A TYR 5 A LYS 156 A LYS 136 A PRO 161 A PRO 141 A CYS 136 A CYS 116 A GLY 140 A GLY 120 A GLY 197 A GLY 179 A CYS 201 A CYS 183 A LYS 204 A LYS 186 A SER 214 A SER 192 A GLY 226 A GLY 204 A VAL 231 A VAL 209 A ASN 179 A ASN 159 A ALA 183 A ALA 163 A GLY 43 A GLY 26 A SER 45 A SER 28 A VAL 52 A VAL 35 A ALA 55 A ALA 38 A ILE 103 A ILE 85 A LYS 107 A LYS 89 A LYS 87 A LYS 69 A HIS 91 A HIS 73 A ILE 63 A ILE 46 A LEU 66 A LEU 50 A GLN 81 A GLN 63 A ALA 85 A ALA 67 CATALYTIC SITE: THE OG ATOM OF SER-195 NUCLEOPHILICALLY ATTACKS THE SUBSTRATE CARBONYL CARBON ATOM. ASP-102 AND HIS-57 TOGETHER PROVIDE GENERAL BASE CATALYSIS. THE N-H GROUPS OF GLY-193 AND SER-195 STABILIZE REACTION INTERMEDIATES THROUGH H-BONDS TO THE SUBSTRATE CARBONYL OXYGEN ATOM. Author 4 SPECIFIC BINDING POCKET: ASP-189 AT THE BOTTOM OF THIS POCKET FORMS AN H-BOND TO THE POSITIVELY CHARGED SIDE CHAIN OF A SPECIFIC SUBSTRATE, GIVING TRYPSIN ITS SPECIFICITY FOR THIS TYPE OF SIDE CHAIN. THE BACKBONE IN THE REGION FROM SER-214 TO CYS-220 IS INVOLVED IN HYDROGEN BONDING TO A PEPTIDE SUBSTRATE Author 10 CONTAINS A TIGHTLY BOUND POSITIVE ION WHICH IS PROBABLY A CA2+ IN THIS STRUCTURE. THE ION IS COORDINATED IN A ROUGHLY OCTAHEDRAL FASHION BY GLU 70, ASN 72, VAL 75, GLU 80, HOH 53 AND HOH 54. THIS REGION WAS FIRST IDENTIFIED AS THE PRIMARY CA2+ BINDING SITE OF TRYPSIN BY BODE AND SCHWAGER, F.E.B.S. LETT., VOL. 56, P139 (1975) Author 11 A HIS 57 A HIS 40 4 1_555 A ASP 102 A ASP 84 4 1_555 A GLY 193 A GLY 175 4 1_555 A SER 195 A SER 177 4 1_555 A ASP 189 A ASP 171 10 1_555 A SER 190 A SER 172 10 1_555 A CYS 191 A CYS 173 10 1_555 A GLN 192 A GLN 174 10 1_555 A SER 214 A SER 192 10 1_555 A TRP 215 A TRP 193 10 1_555 A GLY 216 A GLY 194 10 1_555 A SER 217 A SER 195 10 1_555 A GLY 219 A GLY 196 10 1_555 A CYS 220 A CYS 197 10 1_555 A GLU 70 A GLU 52 11 1_555 A ASP 71 A ASP 53 11 1_555 A ASN 72 A ASN 54 11 1_555 A ILE 73 A ILE 55 11 1_555 A ASN 74 A ASN 56 11 1_555 A VAL 75 A VAL 57 11 1_555 A VAL 76 A VAL 58 11 1_555 A GLU 77 A GLU 59 11 1_555 A GLY 78 A GLY 60 11 1_555 A ASN 79 A ASN 61 11 1_555 A GLU 80 A GLU 62 11 1_555 19 P 21 21 21