HEADER MEMBRANE PROTEIN 29-MAY-25 9OVE TITLE STRUCTURE OF HTWIK2RM-R257A (K2P6.1RM-R257A) ION CHANNEL WITHOUT LIPID TITLE 2 PLUG IN DDM DETERGENT COMPND MOL_ID: 1; COMPND 2 MOLECULE: POTASSIUM CHANNEL SUBFAMILY K MEMBER 6; COMPND 3 CHAIN: B, A; 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_COMMON: HUMAN; SOURCE 8 EXPRESSION_SYSTEM_TAXID: 9606 KEYWDS ION CHANNEL, K2P, TWIK2, TWO PORE CHANNEL, POTASSIUM CHANNEL, KEYWDS 2 MEMBRANE PROTEIN, K2P6.1, LIPID PLUG, TWIK2RM-R257A EXPDTA ELECTRON MICROSCOPY AUTHOR A.MONDAL,D.L.MINOR REVDAT 1 27-MAY-26 9OVE 0 JRNL AUTH A.MONDAL,D.MINOR JRNL TITL STRUCTURE OF HTWIK2RM-R257A (K2P6.1RM-R257A) ION CHANNEL JRNL TITL 2 WITHOUT LIPID PLUG IN DDM DETERGENT JRNL REF TO BE PUBLISHED JRNL REFN REMARK 2 REMARK 2 RESOLUTION. 4.10 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 SOFTWARE PACKAGES : CRYOSPARC, PHENIX, 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 : NULL 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) : 4.100 REMARK 3 NUMBER OF PARTICLES : 187094 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 9OVE COMPLIES WITH FORMAT V. 3.30, 13-JUL-11 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 30-MAY-25. REMARK 100 THE DEPOSITION ID IS D_1000296490. 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 : HUMAN TWIK2RM-R257A (K2P6.1RM REMARK 245 -R257A) REMARK 245 SAMPLE CONCENTRATION (MG ML-1) : NULL REMARK 245 SAMPLE SUPPORT DETAILS : NULL REMARK 245 SAMPLE VITRIFICATION DETAILS : NULL REMARK 245 SAMPLE BUFFER : NULL REMARK 245 PH : 8.00 REMARK 245 SAMPLE DETAILS : MUTATION IN ER RETENTION SIGNAL REMARK 245 AND R257A MUTANT 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 : GATAN K3 (6K X 4K) REMARK 245 MINIMUM DEFOCUS (NM) : 1100.00 REMARK 245 MAXIMUM DEFOCUS (NM) : 2500.00 REMARK 245 MINIMUM TILT ANGLE (DEGREES) : NULL REMARK 245 MAXIMUM TILT ANGLE (DEGREES) : NULL REMARK 245 NOMINAL CS : NULL REMARK 245 IMAGING MODE : BRIGHT FIELD REMARK 245 ELECTRON DOSE (ELECTRONS NM**-2) : 4770.00 REMARK 245 ILLUMINATION MODE : FLOOD BEAM REMARK 245 NOMINAL MAGNIFICATION : NULL 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 APPLY THE FOLLOWING TO CHAINS: B, A 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 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 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 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 ALA B 56 -54.51 -175.41 REMARK 500 VAL B 107 -60.67 -100.04 REMARK 500 PRO B 165 47.79 -78.56 REMARK 500 GLU B 197 43.95 -84.62 REMARK 500 PHE B 201 -7.67 72.55 REMARK 500 ILE B 215 -60.99 -98.42 REMARK 500 GLU A 29 40.65 -100.44 REMARK 500 GLU A 197 45.42 -89.47 REMARK 500 ILE A 215 -61.11 -96.46 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 B 301 K REMARK 620 N RES CSSEQI ATOM REMARK 620 1 THR B 106 O REMARK 620 2 VAL B 107 O 88.5 REMARK 620 3 THR B 214 O 68.5 107.3 REMARK 620 4 ILE B 215 O 125.7 62.5 77.5 REMARK 620 5 VAL A 107 O 173.3 96.8 113.4 60.7 REMARK 620 6 THR A 214 O 65.5 124.2 107.0 168.5 108.0 REMARK 620 7 ILE A 215 O 111.8 61.1 168.1 93.7 67.7 83.2 REMARK 620 N 1 2 3 4 5 6 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 K A 301 K REMARK 620 N RES CSSEQI ATOM REMARK 620 1 THR B 106 O REMARK 620 2 THR B 214 O 73.5 REMARK 620 3 THR B 214 OG1 90.8 50.8 REMARK 620 4 THR A 106 O 141.0 91.3 107.3 REMARK 620 5 THR A 214 O 65.2 116.2 155.9 91.9 REMARK 620 6 THR A 214 OG1 96.4 169.3 134.5 94.7 54.9 REMARK 620 N 1 2 3 4 5 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 K A 302 K REMARK 620 N RES CSSEQI ATOM REMARK 620 1 VAL B 107 O REMARK 620 2 GLY B 108 O 74.5 REMARK 620 3 ILE B 215 O 67.8 123.6 REMARK 620 4 GLY B 216 O 97.4 66.7 78.0 REMARK 620 5 VAL A 107 O 99.7 163.7 65.6 129.6 REMARK 620 6 GLY A 108 O 162.5 108.1 97.7 69.0 82.1 REMARK 620 7 ILE A 215 O 65.8 91.0 108.9 155.7 72.8 130.5 REMARK 620 8 GLY A 216 O 128.2 67.7 163.9 98.7 106.7 66.7 80.6 REMARK 620 N 1 2 3 4 5 6 7 REMARK 900 REMARK 900 RELATED ENTRIES REMARK 900 RELATED ID: EMD-70828 RELATED DB: EMDB REMARK 900 RELATED ID: EMD-70837 RELATED DB: EMDB REMARK 900 RELATED ID: EMD-70885 RELATED DB: EMDB REMARK 900 RELATED ID: EMD-70894 RELATED DB: EMDB REMARK 900 RELATED ID: EMD-70898 RELATED DB: EMDB REMARK 900 RELATED ID: 9OTA RELATED DB: PDB REMARK 900 RELATED ID: 9OTK RELATED DB: PDB REMARK 900 RELATED ID: 9OV0 RELATED DB: PDB REMARK 900 RELATED ID: 9OV9 RELATED DB: PDB REMARK 900 RELATED ID: 9OVD RELATED DB: PDB REMARK 900 RELATED ID: EMD-70899 RELATED DB: EMDB REMARK 900 STRUCTURE OF HTWIK2RM-R257A (K2P6.1RM-R257A) ION CHANNEL WITHOUT REMARK 900 LIPID PLUG IN DDM DETERGENT DBREF 9OVE B 4 275 UNP Q9Y257 KCNK6_HUMAN 4 275 DBREF 9OVE A 4 275 UNP Q9Y257 KCNK6_HUMAN 4 275 SEQADV 9OVE ALA B 257 UNP Q9Y257 ARG 257 ENGINEERED MUTATION SEQADV 9OVE ALA A 257 UNP Q9Y257 ARG 257 ENGINEERED MUTATION SEQRES 1 B 272 GLY ALA LEU LEU ALA GLY ALA LEU ALA ALA TYR ALA ALA SEQRES 2 B 272 TYR LEU VAL LEU GLY ALA LEU LEU VAL ALA ARG LEU GLU SEQRES 3 B 272 GLY PRO HIS GLU ALA ARG LEU ARG ALA GLU LEU GLU THR SEQRES 4 B 272 LEU ARG ALA GLN LEU LEU GLN ARG SER PRO CYS VAL ALA SEQRES 5 B 272 ALA PRO ALA LEU ASP ALA PHE VAL GLU ARG VAL LEU ALA SEQRES 6 B 272 ALA GLY ARG LEU GLY ARG VAL VAL LEU ALA ASN ALA SER SEQRES 7 B 272 GLY SER ALA ASN ALA SER ASP PRO ALA TRP ASP PHE ALA SEQRES 8 B 272 SER ALA LEU PHE PHE ALA SER THR LEU ILE THR THR VAL SEQRES 9 B 272 GLY TYR GLY TYR THR THR PRO LEU THR ASP ALA GLY LYS SEQRES 10 B 272 ALA PHE SER ILE ALA PHE ALA LEU LEU GLY VAL PRO THR SEQRES 11 B 272 THR MET LEU LEU LEU THR ALA SER ALA GLN ARG LEU SER SEQRES 12 B 272 LEU LEU LEU THR HIS VAL PRO LEU SER TRP LEU SER MET SEQRES 13 B 272 ARG TRP GLY TRP ASP PRO ARG ARG ALA ALA CYS TRP HIS SEQRES 14 B 272 LEU VAL ALA LEU LEU GLY VAL VAL VAL THR VAL CYS PHE SEQRES 15 B 272 LEU VAL PRO ALA VAL ILE PHE ALA HIS LEU GLU GLU ALA SEQRES 16 B 272 TRP SER PHE LEU ASP ALA PHE TYR PHE CYS PHE ILE SER SEQRES 17 B 272 LEU SER THR ILE GLY LEU GLY ASP TYR VAL PRO GLY GLU SEQRES 18 B 272 ALA PRO GLY GLN PRO TYR ARG ALA LEU TYR LYS VAL LEU SEQRES 19 B 272 VAL THR VAL TYR LEU PHE LEU GLY LEU VAL ALA MET VAL SEQRES 20 B 272 LEU VAL LEU GLN THR PHE ALA HIS VAL SER ASP LEU HIS SEQRES 21 B 272 GLY LEU THR GLU LEU ILE LEU LEU PRO PRO PRO CYS SEQRES 1 A 272 GLY ALA LEU LEU ALA GLY ALA LEU ALA ALA TYR ALA ALA SEQRES 2 A 272 TYR LEU VAL LEU GLY ALA LEU LEU VAL ALA ARG LEU GLU SEQRES 3 A 272 GLY PRO HIS GLU ALA ARG LEU ARG ALA GLU LEU GLU THR SEQRES 4 A 272 LEU ARG ALA GLN LEU LEU GLN ARG SER PRO CYS VAL ALA SEQRES 5 A 272 ALA PRO ALA LEU ASP ALA PHE VAL GLU ARG VAL LEU ALA SEQRES 6 A 272 ALA GLY ARG LEU GLY ARG VAL VAL LEU ALA ASN ALA SER SEQRES 7 A 272 GLY SER ALA ASN ALA SER ASP PRO ALA TRP ASP PHE ALA SEQRES 8 A 272 SER ALA LEU PHE PHE ALA SER THR LEU ILE THR THR VAL SEQRES 9 A 272 GLY TYR GLY TYR THR THR PRO LEU THR ASP ALA GLY LYS SEQRES 10 A 272 ALA PHE SER ILE ALA PHE ALA LEU LEU GLY VAL PRO THR SEQRES 11 A 272 THR MET LEU LEU LEU THR ALA SER ALA GLN ARG LEU SER SEQRES 12 A 272 LEU LEU LEU THR HIS VAL PRO LEU SER TRP LEU SER MET SEQRES 13 A 272 ARG TRP GLY TRP ASP PRO ARG ARG ALA ALA CYS TRP HIS SEQRES 14 A 272 LEU VAL ALA LEU LEU GLY VAL VAL VAL THR VAL CYS PHE SEQRES 15 A 272 LEU VAL PRO ALA VAL ILE PHE ALA HIS LEU GLU GLU ALA SEQRES 16 A 272 TRP SER PHE LEU ASP ALA PHE TYR PHE CYS PHE ILE SER SEQRES 17 A 272 LEU SER THR ILE GLY LEU GLY ASP TYR VAL PRO GLY GLU SEQRES 18 A 272 ALA PRO GLY GLN PRO TYR ARG ALA LEU TYR LYS VAL LEU SEQRES 19 A 272 VAL THR VAL TYR LEU PHE LEU GLY LEU VAL ALA MET VAL SEQRES 20 A 272 LEU VAL LEU GLN THR PHE ALA HIS VAL SER ASP LEU HIS SEQRES 21 A 272 GLY LEU THR GLU LEU ILE LEU LEU PRO PRO PRO CYS HET K B 301 1 HET K A 301 1 HET K A 302 1 HETNAM K POTASSIUM ION FORMUL 3 K 3(K 1+) HELIX 1 AA1 GLY B 4 SER B 51 1 48 HELIX 2 AA2 ALA B 56 ALA B 68 1 13 HELIX 3 AA3 GLY B 70 ASN B 79 1 10 HELIX 4 AA4 ASP B 92 ILE B 104 1 13 HELIX 5 AA5 THR B 116 VAL B 152 1 37 HELIX 6 AA6 PRO B 165 PHE B 185 1 21 HELIX 7 AA7 PHE B 185 HIS B 194 1 10 HELIX 8 AA8 LEU B 202 SER B 213 1 12 HELIX 9 AA9 TYR B 230 GLY B 264 1 35 HELIX 10 AB1 GLY B 264 LEU B 270 1 7 HELIX 11 AB2 LEU A 6 GLU A 29 1 24 HELIX 12 AB3 GLY A 30 SER A 51 1 22 HELIX 13 AB4 ALA A 55 GLY A 70 1 16 HELIX 14 AB5 ARG A 71 SER A 81 1 11 HELIX 15 AB6 ASP A 92 THR A 105 1 14 HELIX 16 AB7 THR A 116 HIS A 151 1 36 HELIX 17 AB8 ARG A 167 GLU A 196 1 30 HELIX 18 AB9 SER A 200 SER A 213 1 14 HELIX 19 AC1 TYR A 230 HIS A 263 1 34 HELIX 20 AC2 LEU A 265 LEU A 270 1 6 SSBOND 1 CYS B 53 CYS A 53 1555 1555 2.03 LINK O THR B 106 K K B 301 1555 1555 2.78 LINK O THR B 106 K K A 301 1555 1555 2.77 LINK O VAL B 107 K K B 301 1555 1555 2.72 LINK O VAL B 107 K K A 302 1555 1555 2.65 LINK O GLY B 108 K K A 302 1555 1555 2.65 LINK O THR B 214 K K B 301 1555 1555 3.06 LINK O THR B 214 K K A 301 1555 1555 2.73 LINK OG1 THR B 214 K K A 301 1555 1555 3.41 LINK O ILE B 215 K K B 301 1555 1555 2.94 LINK O ILE B 215 K K A 302 1555 1555 2.62 LINK O GLY B 216 K K A 302 1555 1555 2.62 LINK K K B 301 O VAL A 107 1555 1555 2.71 LINK K K B 301 O THR A 214 1555 1555 2.72 LINK K K B 301 O ILE A 215 1555 1555 2.88 LINK O THR A 106 K K A 301 1555 1555 2.81 LINK O VAL A 107 K K A 302 1555 1555 2.66 LINK O GLY A 108 K K A 302 1555 1555 2.63 LINK O THR A 214 K K A 301 1555 1555 2.75 LINK OG1 THR A 214 K K A 301 1555 1555 3.10 LINK O ILE A 215 K K A 302 1555 1555 2.60 LINK O GLY A 216 K K A 302 1555 1555 2.63 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 CONECT 370 2385 CONECT 703 4039 4040 CONECT 710 4039 4041 CONECT 717 4041 CONECT 1546 4039 4040 CONECT 1548 4040 CONECT 1553 4039 4041 CONECT 1561 4041 CONECT 2385 370 CONECT 2726 4040 CONECT 2733 4039 4041 CONECT 2740 4041 CONECT 3569 4039 4040 CONECT 3571 4040 CONECT 3576 4039 4041 CONECT 3584 4041 CONECT 4039 703 710 1546 1553 CONECT 4039 2733 3569 3576 CONECT 4040 703 1546 1548 2726 CONECT 4040 3569 3571 CONECT 4041 710 717 1553 1561 CONECT 4041 2733 2740 3576 3584 MASTER 196 0 3 20 0 0 0 6 4039 2 22 42 END