HEADER MEMBRANE PROTEIN 06-DEC-24 9MEK TITLE STRUCTURE OF THE HUMAN TWIK-2 POTASSIUM CHANNEL COMPND MOL_ID: 1; COMPND 2 MOLECULE: POTASSIUM CHANNEL SUBFAMILY K MEMBER 6; COMPND 3 CHAIN: A, B; COMPND 4 SYNONYM: INWARD RECTIFYING POTASSIUM CHANNEL PROTEIN TWIK-2,TWIK- COMPND 5 ORIGINATED SIMILARITY SEQUENCE; COMPND 6 ENGINEERED: YES SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: HOMO SAPIENS; SOURCE 3 ORGANISM_COMMON: HUMAN; SOURCE 4 ORGANISM_TAXID: 9606; SOURCE 5 GENE: KCNK6, TOSS, TWIK2; SOURCE 6 EXPRESSION_SYSTEM: HOMO SAPIENS; SOURCE 7 EXPRESSION_SYSTEM_TAXID: 9606 KEYWDS TWO-PORE POTASSIUM CHANNEL K2P6 TWIK2 K2P CHANNEL, MEMBRANE PROTEIN EXPDTA ELECTRON MICROSCOPY AUTHOR N.K.KHANRA,S.B.LONG REVDAT 2 05-NOV-25 9MEK 1 JRNL REVDAT 1 23-APR-25 9MEK 0 JRNL AUTH N.K.KHANRA,C.WANG,B.D.DELGADO,S.B.LONG JRNL TITL STRUCTURE OF THE HUMAN TWIK-2 POTASSIUM CHANNEL AND ITS JRNL TITL 2 INHIBITION BY PIMOZIDE. JRNL REF PROC.NATL.ACAD.SCI.USA V. 122 09122 2025 JRNL REFN ESSN 1091-6490 JRNL PMID 40343992 JRNL DOI 10.1073/PNAS.2425709122 REMARK 2 REMARK 2 RESOLUTION. 2.85 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 SOFTWARE PACKAGES : EPU, CRYOSPARC REMARK 3 RECONSTRUCTION SCHEMA : NULL REMARK 3 REMARK 3 EM MAP-MODEL FITTING AND REFINEMENT REMARK 3 PDB ENTRY : NULL REMARK 3 REFINEMENT SPACE : NULL REMARK 3 REFINEMENT PROTOCOL : NULL REMARK 3 REFINEMENT TARGET : NULL REMARK 3 OVERALL ANISOTROPIC B VALUE : 89.300 REMARK 3 REMARK 3 FITTING PROCEDURE : NULL REMARK 3 REMARK 3 EM IMAGE RECONSTRUCTION STATISTICS REMARK 3 NOMINAL PIXEL SIZE (ANGSTROMS) : NULL REMARK 3 ACTUAL PIXEL SIZE (ANGSTROMS) : NULL REMARK 3 EFFECTIVE RESOLUTION (ANGSTROMS) : 2.850 REMARK 3 NUMBER OF PARTICLES : 131053 REMARK 3 CTF CORRECTION METHOD : PHASE FLIPPING AND AMPLITUDE REMARK 3 CORRECTION REMARK 3 REMARK 3 EM RECONSTRUCTION MAGNIFICATION CALIBRATION: NULL REMARK 3 REMARK 3 OTHER DETAILS: NULL REMARK 4 REMARK 4 9MEK COMPLIES WITH FORMAT V. 3.30, 13-JUL-11 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 09-DEC-24. REMARK 100 THE DEPOSITION ID IS D_1000289038. REMARK 245 REMARK 245 EXPERIMENTAL DETAILS REMARK 245 RECONSTRUCTION METHOD : SINGLE PARTICLE REMARK 245 SPECIMEN TYPE : NULL REMARK 245 REMARK 245 ELECTRON MICROSCOPE SAMPLE REMARK 245 SAMPLE TYPE : PARTICLE REMARK 245 PARTICLE TYPE : POINT REMARK 245 NAME OF SAMPLE : TWIK-2 REMARK 245 SAMPLE CONCENTRATION (MG ML-1) : 6.00 REMARK 245 SAMPLE SUPPORT DETAILS : NULL REMARK 245 SAMPLE VITRIFICATION DETAILS : 3.5 UL SAMPLE, BLOT TIME = 3.0 REMARK 245 SEC, BLOT FORCE = 0 REMARK 245 SAMPLE BUFFER : NULL REMARK 245 PH : 7.50 REMARK 245 SAMPLE DETAILS : HUMAN TWIK-2 POTASSIUM CHANNEL REMARK 245 REMARK 245 DATA ACQUISITION REMARK 245 DATE OF EXPERIMENT : NULL REMARK 245 NUMBER OF MICROGRAPHS-IMAGES : NULL REMARK 245 TEMPERATURE (KELVIN) : NULL REMARK 245 MICROSCOPE MODEL : TFS KRIOS REMARK 245 DETECTOR TYPE : TFS FALCON 4I (4K X 4K) REMARK 245 MINIMUM DEFOCUS (NM) : 1000.00 REMARK 245 MAXIMUM DEFOCUS (NM) : 2000.00 REMARK 245 MINIMUM TILT ANGLE (DEGREES) : NULL REMARK 245 MAXIMUM TILT ANGLE (DEGREES) : NULL REMARK 245 NOMINAL CS : 2.70 REMARK 245 IMAGING MODE : BRIGHT FIELD REMARK 245 ELECTRON DOSE (ELECTRONS NM**-2) : 6076.00 REMARK 245 ILLUMINATION MODE : FLOOD BEAM REMARK 245 NOMINAL MAGNIFICATION : 165000 REMARK 245 CALIBRATED MAGNIFICATION : NULL REMARK 245 SOURCE : FIELD EMISSION GUN REMARK 245 ACCELERATION VOLTAGE (KV) : 300 REMARK 245 IMAGING DETAILS : NULL REMARK 247 REMARK 247 ELECTRON MICROSCOPY REMARK 247 THE COORDINATES IN THIS ENTRY WERE GENERATED FROM ELECTRON REMARK 247 MICROSCOPY DATA. PROTEIN DATA BANK CONVENTIONS REQUIRE REMARK 247 THAT CRYST1 AND SCALE RECORDS BE INCLUDED, BUT THE VALUES REMARK 247 ON THESE RECORDS ARE MEANINGLESS EXCEPT FOR THE CALCULATION REMARK 247 OF THE STRUCTURE FACTORS. REMARK 300 REMARK 300 BIOMOLECULE: 1 REMARK 300 SEE REMARK 350 FOR THE AUTHOR PROVIDED AND/OR PROGRAM REMARK 300 GENERATED ASSEMBLY INFORMATION FOR THE STRUCTURE IN REMARK 300 THIS ENTRY. THE REMARK MAY ALSO PROVIDE INFORMATION ON REMARK 300 BURIED SURFACE AREA. REMARK 350 REMARK 350 COORDINATES FOR A COMPLETE MULTIMER REPRESENTING THE KNOWN REMARK 350 BIOLOGICALLY SIGNIFICANT OLIGOMERIZATION STATE OF THE REMARK 350 MOLECULE CAN BE GENERATED BY APPLYING BIOMT TRANSFORMATIONS REMARK 350 GIVEN BELOW. BOTH NON-CRYSTALLOGRAPHIC AND REMARK 350 CRYSTALLOGRAPHIC OPERATIONS ARE GIVEN. REMARK 350 REMARK 350 BIOMOLECULE: 1 REMARK 350 AUTHOR DETERMINED BIOLOGICAL UNIT: DIMERIC REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: DIMERIC REMARK 350 SOFTWARE USED: PISA REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B REMARK 350 BIOMT1 1 1.000000 0.000000 0.000000 0.00000 REMARK 350 BIOMT2 1 0.000000 1.000000 0.000000 0.00000 REMARK 350 BIOMT3 1 0.000000 0.000000 1.000000 0.00000 REMARK 465 REMARK 465 MISSING RESIDUES REMARK 465 THE FOLLOWING RESIDUES WERE NOT LOCATED IN THE REMARK 465 EXPERIMENT. (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN REMARK 465 IDENTIFIER; SSSEQ=SEQUENCE NUMBER; I=INSERTION CODE.) REMARK 465 REMARK 465 M RES C SSSEQI REMARK 465 MET A 1 REMARK 465 ARG A 2 REMARK 465 ARG A 3 REMARK 465 GLY A 4 REMARK 465 ALA A 5 REMARK 465 LEU A 6 REMARK 465 ASN A 79 REMARK 465 ALA A 80 REMARK 465 SER A 81 REMARK 465 GLY A 82 REMARK 465 SER A 83 REMARK 465 ALA A 84 REMARK 465 ASN A 85 REMARK 465 ALA A 86 REMARK 465 SER A 87 REMARK 465 ASP A 88 REMARK 465 PRO A 89 REMARK 465 ALA A 90 REMARK 465 VAL A 152 REMARK 465 PRO A 153 REMARK 465 LEU A 154 REMARK 465 SER A 155 REMARK 465 TRP A 156 REMARK 465 LEU A 157 REMARK 465 SER A 158 REMARK 465 MET A 159 REMARK 465 ARG A 160 REMARK 465 TRP A 161 REMARK 465 GLY A 162 REMARK 465 TRP A 163 REMARK 465 ASP A 164 REMARK 465 PRO A 165 REMARK 465 PRO A 272 REMARK 465 PRO A 273 REMARK 465 PRO A 274 REMARK 465 CYS A 275 REMARK 465 PRO A 276 REMARK 465 ALA A 277 REMARK 465 SER A 278 REMARK 465 PHE A 279 REMARK 465 ASN A 280 REMARK 465 ALA A 281 REMARK 465 ASP A 282 REMARK 465 GLU A 283 REMARK 465 ASP A 284 REMARK 465 ASP A 285 REMARK 465 ARG A 286 REMARK 465 VAL A 287 REMARK 465 ASP A 288 REMARK 465 ILE A 289 REMARK 465 LEU A 290 REMARK 465 GLY A 291 REMARK 465 PRO A 292 REMARK 465 GLN A 293 REMARK 465 PRO A 294 REMARK 465 GLU A 295 REMARK 465 SER A 296 REMARK 465 HIS A 297 REMARK 465 GLN A 298 REMARK 465 GLN A 299 REMARK 465 LEU A 300 REMARK 465 SER A 301 REMARK 465 ALA A 302 REMARK 465 SER A 303 REMARK 465 SER A 304 REMARK 465 HIS A 305 REMARK 465 THR A 306 REMARK 465 ASP A 307 REMARK 465 TYR A 308 REMARK 465 ALA A 309 REMARK 465 SER A 310 REMARK 465 ILE A 311 REMARK 465 PRO A 312 REMARK 465 ARG A 313 REMARK 465 MET B 1 REMARK 465 ARG B 2 REMARK 465 ARG B 3 REMARK 465 GLY B 4 REMARK 465 ALA B 5 REMARK 465 LEU B 6 REMARK 465 ASN B 79 REMARK 465 ALA B 80 REMARK 465 SER B 81 REMARK 465 GLY B 82 REMARK 465 SER B 83 REMARK 465 ALA B 84 REMARK 465 ASN B 85 REMARK 465 ALA B 86 REMARK 465 SER B 87 REMARK 465 ASP B 88 REMARK 465 PRO B 89 REMARK 465 ALA B 90 REMARK 465 VAL B 152 REMARK 465 PRO B 153 REMARK 465 LEU B 154 REMARK 465 SER B 155 REMARK 465 TRP B 156 REMARK 465 LEU B 157 REMARK 465 SER B 158 REMARK 465 MET B 159 REMARK 465 ARG B 160 REMARK 465 TRP B 161 REMARK 465 GLY B 162 REMARK 465 TRP B 163 REMARK 465 ASP B 164 REMARK 465 PRO B 165 REMARK 465 PRO B 272 REMARK 465 PRO B 273 REMARK 465 PRO B 274 REMARK 465 CYS B 275 REMARK 465 PRO B 276 REMARK 465 ALA B 277 REMARK 465 SER B 278 REMARK 465 PHE B 279 REMARK 465 ASN B 280 REMARK 465 ALA B 281 REMARK 465 ASP B 282 REMARK 465 GLU B 283 REMARK 465 ASP B 284 REMARK 465 ASP B 285 REMARK 465 ARG B 286 REMARK 465 VAL B 287 REMARK 465 ASP B 288 REMARK 465 ILE B 289 REMARK 465 LEU B 290 REMARK 465 GLY B 291 REMARK 465 PRO B 292 REMARK 465 GLN B 293 REMARK 465 PRO B 294 REMARK 465 GLU B 295 REMARK 465 SER B 296 REMARK 465 HIS B 297 REMARK 465 GLN B 298 REMARK 465 GLN B 299 REMARK 465 LEU B 300 REMARK 465 SER B 301 REMARK 465 ALA B 302 REMARK 465 SER B 303 REMARK 465 SER B 304 REMARK 465 HIS B 305 REMARK 465 THR B 306 REMARK 465 ASP B 307 REMARK 465 TYR B 308 REMARK 465 ALA B 309 REMARK 465 SER B 310 REMARK 465 ILE B 311 REMARK 465 PRO B 312 REMARK 465 ARG B 313 REMARK 470 REMARK 470 MISSING ATOM REMARK 470 THE FOLLOWING RESIDUES HAVE MISSING ATOMS (M=MODEL NUMBER; REMARK 470 RES=RESIDUE NAME; C=CHAIN IDENTIFIER; SSEQ=SEQUENCE NUMBER; REMARK 470 I=INSERTION CODE): REMARK 470 M RES CSSEQI ATOMS REMARK 470 GLU A 39 CG CD OE1 OE2 REMARK 470 ARG A 71 CG CD NE CZ NH1 NH2 REMARK 470 ARG A 74 CG CD NE CZ NH1 NH2 REMARK 470 ARG A 167 CG CD NE CZ NH1 NH2 REMARK 470 ARG A 231 CG CD NE CZ NH1 NH2 REMARK 470 ASP A 261 CG OD1 OD2 REMARK 470 GLU A 267 CG CD OE1 OE2 REMARK 470 GLU B 39 CG CD OE1 OE2 REMARK 470 ARG B 71 CG CD NE CZ NH1 NH2 REMARK 470 ARG B 74 CG CD NE CZ NH1 NH2 REMARK 470 ARG B 167 CG CD NE CZ NH1 NH2 REMARK 470 ARG B 231 CG CD NE CZ NH1 NH2 REMARK 470 ASP B 261 CG OD1 OD2 REMARK 470 GLU B 267 CG CD OE1 OE2 REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: TORSION ANGLES REMARK 500 REMARK 500 TORSION ANGLES OUTSIDE THE EXPECTED RAMACHANDRAN REGIONS: REMARK 500 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER; REMARK 500 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE). REMARK 500 REMARK 500 STANDARD TABLE: REMARK 500 FORMAT:(10X,I3,1X,A3,1X,A1,I4,A1,4X,F7.2,3X,F7.2) REMARK 500 REMARK 500 EXPECTED VALUES: GJ KLEYWEGT AND TA JONES (1996). PHI/PSI- REMARK 500 CHOLOGY: RAMACHANDRAN REVISITED. STRUCTURE 4, 1395 - 1400 REMARK 500 REMARK 500 M RES CSSEQI PSI PHI REMARK 500 ARG A 71 -2.66 67.96 REMARK 500 ALA A 198 49.60 -91.61 REMARK 500 THR A 266 -2.76 67.60 REMARK 500 ARG B 71 -2.66 67.96 REMARK 500 ALA B 198 49.60 -91.61 REMARK 500 THR B 266 -2.76 67.60 REMARK 500 REMARK 500 REMARK: NULL REMARK 620 REMARK 620 METAL COORDINATION REMARK 620 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER; REMARK 620 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE): REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 K A 403 K REMARK 620 N RES CSSEQI ATOM REMARK 620 1 THR A 106 O REMARK 620 2 VAL A 107 O 76.8 REMARK 620 3 THR A 214 O 68.2 97.5 REMARK 620 4 ILE A 215 O 128.3 65.8 82.3 REMARK 620 5 THR B 106 O 105.6 160.5 66.5 99.7 REMARK 620 6 VAL B 107 O 158.0 107.0 131.0 70.7 78.4 REMARK 620 7 THR B 214 O 65.2 127.7 100.0 165.3 68.5 97.5 REMARK 620 8 ILE B 215 O 96.9 69.4 162.6 101.6 128.4 65.6 80.6 REMARK 620 N 1 2 3 4 5 6 7 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 K A 404 K REMARK 620 N RES CSSEQI ATOM REMARK 620 1 THR A 106 O REMARK 620 2 THR A 106 OG1 62.3 REMARK 620 3 THR A 214 O 62.2 108.1 REMARK 620 4 THR A 214 OG1 99.9 84.5 64.3 REMARK 620 5 THR B 106 O 90.8 151.8 60.9 109.6 REMARK 620 6 THR B 106 OG1 154.5 143.2 98.2 84.2 64.4 REMARK 620 7 THR B 214 O 59.3 94.5 93.4 155.9 62.5 109.5 REMARK 620 8 THR B 214 OG1 105.9 81.4 155.4 140.2 99.9 85.2 62.7 REMARK 620 N 1 2 3 4 5 6 7 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 K A 402 K REMARK 620 N RES CSSEQI ATOM REMARK 620 1 VAL A 107 O REMARK 620 2 GLY A 108 O 69.2 REMARK 620 3 ILE A 215 O 67.6 124.0 REMARK 620 4 GLY A 216 O 85.9 71.5 71.6 REMARK 620 5 VAL B 107 O 107.4 155.7 72.5 132.8 REMARK 620 6 GLY B 108 O 157.9 122.2 91.4 81.0 70.2 REMARK 620 7 ILE B 215 O 71.4 89.3 108.4 154.6 67.3 124.1 REMARK 620 8 GLY B 216 O 130.3 79.6 156.3 120.0 85.9 71.8 70.5 REMARK 620 N 1 2 3 4 5 6 7 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 K A 401 K REMARK 620 N RES CSSEQI ATOM REMARK 620 1 GLY A 108 O REMARK 620 2 TYR A 109 O 72.0 REMARK 620 3 GLY A 216 O 55.7 87.1 REMARK 620 4 LEU A 217 O 123.1 82.1 73.7 REMARK 620 5 GLY B 108 O 86.5 149.4 62.5 92.2 REMARK 620 6 TYR B 109 O 146.4 135.8 128.7 84.8 72.9 REMARK 620 7 GLY B 216 O 61.0 125.0 88.9 147.6 55.4 85.4 REMARK 620 8 LEU B 217 O 88.9 81.9 144.6 137.0 120.2 79.5 70.7 REMARK 620 N 1 2 3 4 5 6 7 REMARK 900 REMARK 900 RELATED ENTRIES REMARK 900 RELATED ID: EMD-48216 RELATED DB: EMDB REMARK 900 STRUCTURE OF THE HUMAN TWIK-2 POTASSIUM CHANNEL DBREF 9MEK A 1 313 UNP Q9Y257 KCNK6_HUMAN 1 313 DBREF 9MEK B 1 313 UNP Q9Y257 KCNK6_HUMAN 1 313 SEQRES 1 A 313 MET ARG ARG GLY ALA LEU LEU ALA GLY ALA LEU ALA ALA SEQRES 2 A 313 TYR ALA ALA TYR LEU VAL LEU GLY ALA LEU LEU VAL ALA SEQRES 3 A 313 ARG LEU GLU GLY PRO HIS GLU ALA ARG LEU ARG ALA GLU SEQRES 4 A 313 LEU GLU THR LEU ARG ALA GLN LEU LEU GLN ARG SER PRO SEQRES 5 A 313 CYS VAL ALA ALA PRO ALA LEU ASP ALA PHE VAL GLU ARG SEQRES 6 A 313 VAL LEU ALA ALA GLY ARG LEU GLY ARG VAL VAL LEU ALA SEQRES 7 A 313 ASN ALA SER GLY SER ALA ASN ALA SER ASP PRO ALA TRP SEQRES 8 A 313 ASP PHE ALA SER ALA LEU PHE PHE ALA SER THR LEU ILE SEQRES 9 A 313 THR THR VAL GLY TYR GLY TYR THR THR PRO LEU THR ASP SEQRES 10 A 313 ALA GLY LYS ALA PHE SER ILE ALA PHE ALA LEU LEU GLY SEQRES 11 A 313 VAL PRO THR THR MET LEU LEU LEU THR ALA SER ALA GLN SEQRES 12 A 313 ARG LEU SER LEU LEU LEU THR HIS VAL PRO LEU SER TRP SEQRES 13 A 313 LEU SER MET ARG TRP GLY TRP ASP PRO ARG ARG ALA ALA SEQRES 14 A 313 CYS TRP HIS LEU VAL ALA LEU LEU GLY VAL VAL VAL THR SEQRES 15 A 313 VAL CYS PHE LEU VAL PRO ALA VAL ILE PHE ALA HIS LEU SEQRES 16 A 313 GLU GLU ALA TRP SER PHE LEU ASP ALA PHE TYR PHE CYS SEQRES 17 A 313 PHE ILE SER LEU SER THR ILE GLY LEU GLY ASP TYR VAL SEQRES 18 A 313 PRO GLY GLU ALA PRO GLY GLN PRO TYR ARG ALA LEU TYR SEQRES 19 A 313 LYS VAL LEU VAL THR VAL TYR LEU PHE LEU GLY LEU VAL SEQRES 20 A 313 ALA MET VAL LEU VAL LEU GLN THR PHE ARG HIS VAL SER SEQRES 21 A 313 ASP LEU HIS GLY LEU THR GLU LEU ILE LEU LEU PRO PRO SEQRES 22 A 313 PRO CYS PRO ALA SER PHE ASN ALA ASP GLU ASP ASP ARG SEQRES 23 A 313 VAL ASP ILE LEU GLY PRO GLN PRO GLU SER HIS GLN GLN SEQRES 24 A 313 LEU SER ALA SER SER HIS THR ASP TYR ALA SER ILE PRO SEQRES 25 A 313 ARG SEQRES 1 B 313 MET ARG ARG GLY ALA LEU LEU ALA GLY ALA LEU ALA ALA SEQRES 2 B 313 TYR ALA ALA TYR LEU VAL LEU GLY ALA LEU LEU VAL ALA SEQRES 3 B 313 ARG LEU GLU GLY PRO HIS GLU ALA ARG LEU ARG ALA GLU SEQRES 4 B 313 LEU GLU THR LEU ARG ALA GLN LEU LEU GLN ARG SER PRO SEQRES 5 B 313 CYS VAL ALA ALA PRO ALA LEU ASP ALA PHE VAL GLU ARG SEQRES 6 B 313 VAL LEU ALA ALA GLY ARG LEU GLY ARG VAL VAL LEU ALA SEQRES 7 B 313 ASN ALA SER GLY SER ALA ASN ALA SER ASP PRO ALA TRP SEQRES 8 B 313 ASP PHE ALA SER ALA LEU PHE PHE ALA SER THR LEU ILE SEQRES 9 B 313 THR THR VAL GLY TYR GLY TYR THR THR PRO LEU THR ASP SEQRES 10 B 313 ALA GLY LYS ALA PHE SER ILE ALA PHE ALA LEU LEU GLY SEQRES 11 B 313 VAL PRO THR THR MET LEU LEU LEU THR ALA SER ALA GLN SEQRES 12 B 313 ARG LEU SER LEU LEU LEU THR HIS VAL PRO LEU SER TRP SEQRES 13 B 313 LEU SER MET ARG TRP GLY TRP ASP PRO ARG ARG ALA ALA SEQRES 14 B 313 CYS TRP HIS LEU VAL ALA LEU LEU GLY VAL VAL VAL THR SEQRES 15 B 313 VAL CYS PHE LEU VAL PRO ALA VAL ILE PHE ALA HIS LEU SEQRES 16 B 313 GLU GLU ALA TRP SER PHE LEU ASP ALA PHE TYR PHE CYS SEQRES 17 B 313 PHE ILE SER LEU SER THR ILE GLY LEU GLY ASP TYR VAL SEQRES 18 B 313 PRO GLY GLU ALA PRO GLY GLN PRO TYR ARG ALA LEU TYR SEQRES 19 B 313 LYS VAL LEU VAL THR VAL TYR LEU PHE LEU GLY LEU VAL SEQRES 20 B 313 ALA MET VAL LEU VAL LEU GLN THR PHE ARG HIS VAL SER SEQRES 21 B 313 ASP LEU HIS GLY LEU THR GLU LEU ILE LEU LEU PRO PRO SEQRES 22 B 313 PRO CYS PRO ALA SER PHE ASN ALA ASP GLU ASP ASP ARG SEQRES 23 B 313 VAL ASP ILE LEU GLY PRO GLN PRO GLU SER HIS GLN GLN SEQRES 24 B 313 LEU SER ALA SER SER HIS THR ASP TYR ALA SER ILE PRO SEQRES 25 B 313 ARG HET K A 401 1 HET K A 402 1 HET K A 403 1 HET K A 404 1 HET HP6 A 405 7 HET HP6 B 401 7 HETNAM K POTASSIUM ION HETNAM HP6 HEPTANE FORMUL 3 K 4(K 1+) FORMUL 7 HP6 2(C7 H16) HELIX 1 AA1 LEU A 7 SER A 51 1 45 HELIX 2 AA2 ALA A 55 ALA A 69 1 15 HELIX 3 AA3 LEU A 72 ALA A 78 1 7 HELIX 4 AA4 ASP A 92 THR A 105 1 14 HELIX 5 AA5 THR A 116 HIS A 151 1 36 HELIX 6 AA6 ARG A 167 LEU A 195 1 29 HELIX 7 AA8 SER A 200 SER A 213 1 14 HELIX 8 AA9 TYR A 230 GLY A 264 1 35 HELIX 9 A10 GLU A 267 LEU A 271 1 5 HELIX 10 AB1 ALA B 8 SER B 51 1 44 HELIX 11 AB2 ALA B 55 ALA B 69 1 15 HELIX 12 AB3 LEU B 72 ALA B 78 1 7 HELIX 13 AB4 ASP B 92 THR B 105 1 14 HELIX 14 AB5 THR B 116 HIS B 151 1 36 HELIX 15 AB8 SER B 200 SER B 213 1 14 HELIX 16 AB9 TYR B 230 GLY B 264 1 35 HELIX 17 B10 GLU B 267 LEU B 271 1 5 SSBOND 1 CYS A 53 CYS B 53 1555 1555 2.03 LINK O THR A 106 K K A 403 1555 1555 2.63 LINK O THR A 106 K K A 404 1555 1555 2.95 LINK OG1 THR A 106 K K A 404 1555 1555 3.45 LINK O VAL A 107 K K A 402 1555 1555 2.82 LINK O VAL A 107 K K A 403 1555 1555 2.83 LINK O GLY A 108 K K A 401 1555 1555 3.20 LINK O GLY A 108 K K A 402 1555 1555 2.51 LINK O TYR A 109 K K A 401 1555 1555 2.52 LINK O THR A 214 K K A 403 1555 1555 2.63 LINK O THR A 214 K K A 404 1555 1555 2.76 LINK OG1 THR A 214 K K A 404 1555 1555 3.25 LINK O ILE A 215 K K A 402 1555 1555 2.65 LINK O ILE A 215 K K A 403 1555 1555 2.77 LINK O GLY A 216 K K A 401 1555 1555 3.10 LINK O GLY A 216 K K A 402 1555 1555 2.53 LINK O LEU A 217 K K A 401 1555 1555 2.93 LINK K K A 401 O GLY B 108 1555 1555 3.15 LINK K K A 401 O TYR B 109 1555 1555 2.51 LINK K K A 401 O GLY B 216 1555 1555 3.19 LINK K K A 401 O LEU B 217 1555 1555 3.06 LINK K K A 402 O VAL B 107 1555 1555 2.79 LINK K K A 402 O GLY B 108 1555 1555 2.46 LINK K K A 402 O ILE B 215 1555 1555 2.70 LINK K K A 402 O GLY B 216 1555 1555 2.56 LINK K K A 403 O THR B 106 1555 1555 2.57 LINK K K A 403 O VAL B 107 1555 1555 2.80 LINK K K A 403 O THR B 214 1555 1555 2.67 LINK K K A 403 O ILE B 215 1555 1555 2.83 LINK K K A 404 O THR B 106 1555 1555 2.87 LINK K K A 404 OG1 THR B 106 1555 1555 3.34 LINK K K A 404 O THR B 214 1555 1555 2.82 LINK K K A 404 OG1 THR B 214 1555 1555 3.32 CRYST1 1.000 1.000 1.000 90.00 90.00 90.00 P 1 ORIGX1 1.000000 0.000000 0.000000 0.00000 ORIGX2 0.000000 1.000000 0.000000 0.00000 ORIGX3 0.000000 0.000000 1.000000 0.00000 SCALE1 1.000000 0.000000 0.000000 0.00000 SCALE2 0.000000 1.000000 0.000000 0.00000 SCALE3 0.000000 0.000000 1.000000 0.00000 TER 1789 LEU A 271 TER 3578 LEU B 271 HETATM 3579 K K A 401 139.219 139.130 137.288 1.00 38.16 K HETATM 3580 K K A 402 139.192 139.168 133.777 1.00 30.24 K HETATM 3581 K K A 403 139.188 139.158 130.442 1.00 17.04 K HETATM 3582 K K A 404 139.189 139.133 126.826 1.00 25.90 K HETATM 3583 C20 HP6 A 405 143.352 136.350 121.846 1.00 33.54 C HETATM 3584 C21 HP6 A 405 142.954 135.036 122.507 1.00 36.99 C HETATM 3585 C22 HP6 A 405 143.547 133.819 121.810 1.00 45.05 C HETATM 3586 C23 HP6 A 405 143.423 132.531 122.614 1.00 38.82 C HETATM 3587 C24 HP6 A 405 142.007 131.972 122.648 1.00 48.95 C HETATM 3588 C25 HP6 A 405 141.907 130.618 123.343 1.00 52.32 C HETATM 3589 C26 HP6 A 405 142.643 129.514 122.596 1.00 46.95 C HETATM 3590 C20 HP6 B 401 135.048 142.050 121.846 1.00 33.54 C HETATM 3591 C21 HP6 B 401 135.446 143.364 122.507 1.00 36.99 C HETATM 3592 C22 HP6 B 401 134.853 144.581 121.810 1.00 45.05 C HETATM 3593 C23 HP6 B 401 134.977 145.869 122.614 1.00 38.82 C HETATM 3594 C24 HP6 B 401 136.393 146.428 122.648 1.00 48.95 C HETATM 3595 C25 HP6 B 401 136.493 147.782 123.343 1.00 52.32 C HETATM 3596 C26 HP6 B 401 135.757 148.886 122.596 1.00 46.95 C CONECT 349 2138 CONECT 639 3581 3582 CONECT 641 3582 CONECT 646 3580 3581 CONECT 653 3579 3580 CONECT 657 3579 CONECT 1354 3581 3582 CONECT 1356 3582 CONECT 1361 3580 3581 CONECT 1369 3579 3580 CONECT 1373 3579 CONECT 2138 349 CONECT 2428 3581 3582 CONECT 2430 3582 CONECT 2435 3580 3581 CONECT 2442 3579 3580 CONECT 2446 3579 CONECT 3143 3581 3582 CONECT 3145 3582 CONECT 3150 3580 3581 CONECT 3158 3579 3580 CONECT 3162 3579 CONECT 3579 653 657 1369 1373 CONECT 3579 2442 2446 3158 3162 CONECT 3580 646 653 1361 1369 CONECT 3580 2435 2442 3150 3158 CONECT 3581 639 646 1354 1361 CONECT 3581 2428 2435 3143 3150 CONECT 3582 639 641 1354 1356 CONECT 3582 2428 2430 3143 3145 CONECT 3583 3584 CONECT 3584 3583 3585 CONECT 3585 3584 3586 CONECT 3586 3585 3587 CONECT 3587 3586 3588 CONECT 3588 3587 3589 CONECT 3589 3588 CONECT 3590 3591 CONECT 3591 3590 3592 CONECT 3592 3591 3593 CONECT 3593 3592 3594 CONECT 3594 3593 3595 CONECT 3595 3594 3596 CONECT 3596 3595 MASTER 354 0 6 17 0 0 0 6 3594 2 44 50 END