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- EMDB-26321: Cryo-EM structure of the pancreatic ATP-sensitive potassium chann... -

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Basic information

Entry
Database: EMDB / ID: EMD-26321
TitleCryo-EM structure of the pancreatic ATP-sensitive potassium channel in the presence of carbamazepine and ATP with Kir6.2-CTD in the down conformation
Map data
Sample
  • Complex: KATP-GBC-ATP-CTDup
    • Complex: Kir6.2
      • Protein or peptide: ATP-sensitive inward rectifier potassium channel 11
    • Complex: SUR1
      • Protein or peptide: ATP-binding cassette sub-family C member 8
  • Ligand: PHOSPHATIDYLETHANOLAMINE
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
  • Ligand: O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-L-serine
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
KeywordsKATP channel / SUR1 / Kir6.2 / glibenclamide / GBC / GBM / sulfonylurea receptor / potassium transport / metabolic sensor / MEMBRANE PROTEIN
Function / homology
Function and homology information


Regulation of insulin secretion / ATP sensitive Potassium channels / ABC-family proteins mediated transport / response to resveratrol / ATP-activated inward rectifier potassium channel activity / inward rectifying potassium channel / sulfonylurea receptor activity / cell body fiber / ventricular cardiac muscle tissue development / CAMKK-AMPK signaling cascade ...Regulation of insulin secretion / ATP sensitive Potassium channels / ABC-family proteins mediated transport / response to resveratrol / ATP-activated inward rectifier potassium channel activity / inward rectifying potassium channel / sulfonylurea receptor activity / cell body fiber / ventricular cardiac muscle tissue development / CAMKK-AMPK signaling cascade / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / ATPase-coupled monoatomic cation transmembrane transporter activity / inward rectifier potassium channel activity / regulation of monoatomic ion transmembrane transport / nervous system process / inorganic cation transmembrane transport / response to stress / ankyrin binding / Ion homeostasis / response to ATP / action potential / potassium ion import across plasma membrane / response to testosterone / voltage-gated potassium channel activity / intercalated disc / potassium channel activity / axolemma / ABC-type transporter activity / negative regulation of insulin secretion / cellular response to nutrient levels / heat shock protein binding / T-tubule / potassium ion transmembrane transport / regulation of insulin secretion / acrosomal vesicle / regulation of membrane potential / determination of adult lifespan / response to ischemia / positive regulation of protein localization to plasma membrane / cellular response to glucose stimulus / potassium ion transport / sarcolemma / cellular response to nicotine / glucose metabolic process / cellular response to tumor necrosis factor / nuclear envelope / response to estradiol / presynaptic membrane / transmembrane transporter binding / response to hypoxia / endosome / response to xenobiotic stimulus / neuronal cell body / glutamatergic synapse / apoptotic process / ATP hydrolysis activity / protein-containing complex / ATP binding / plasma membrane / cytoplasm
Similarity search - Function
Potassium channel, inwardly rectifying, Kir6.2 / ATP-binding cassette subfamily C member 8 / Sulphonylurea receptor / Potassium channel, inwardly rectifying, transmembrane domain / Inward rectifier potassium channel transmembrane domain / Potassium channel, inwardly rectifying, Kir, cytoplasmic / Potassium channel, inwardly rectifying, Kir / Inward rectifier potassium channel, C-terminal / Inward rectifier potassium channel C-terminal domain / : ...Potassium channel, inwardly rectifying, Kir6.2 / ATP-binding cassette subfamily C member 8 / Sulphonylurea receptor / Potassium channel, inwardly rectifying, transmembrane domain / Inward rectifier potassium channel transmembrane domain / Potassium channel, inwardly rectifying, Kir, cytoplasmic / Potassium channel, inwardly rectifying, Kir / Inward rectifier potassium channel, C-terminal / Inward rectifier potassium channel C-terminal domain / : / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / Immunoglobulin E-set / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ATP-sensitive inward rectifier potassium channel 11 / ATP-binding cassette sub-family C member 8
Similarity search - Component
Biological speciesCricetus cricetus (black-bellied hamster) / Rattus norvegicus (Norway rat)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.1 Å
AuthorsShyng SL / Sung MW
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)R01 DK066485-13 United States
CitationJournal: Elife / Year: 2019
Title: Mechanism of pharmacochaperoning in a mammalian K channel revealed by cryo-EM.
Authors: Gregory M Martin / Min Woo Sung / Zhongying Yang / Laura M Innes / Balamurugan Kandasamy / Larry L David / Craig Yoshioka / Show-Ling Shyng /
Abstract: ATP-sensitive potassium (K) channels composed of a pore-forming Kir6.2 potassium channel and a regulatory ABC transporter sulfonylurea receptor 1 (SUR1) regulate insulin secretion in pancreatic β- ...ATP-sensitive potassium (K) channels composed of a pore-forming Kir6.2 potassium channel and a regulatory ABC transporter sulfonylurea receptor 1 (SUR1) regulate insulin secretion in pancreatic β-cells to maintain glucose homeostasis. Mutations that impair channel folding or assembly prevent cell surface expression and cause congenital hyperinsulinism. Structurally diverse K inhibitors are known to act as pharmacochaperones to correct mutant channel expression, but the mechanism is unknown. Here, we compare cryoEM structures of a mammalian K channel bound to pharmacochaperones glibenclamide, repaglinide, and carbamazepine. We found all three drugs bind within a common pocket in SUR1. Further, we found the N-terminus of Kir6.2 inserted within the central cavity of the SUR1 ABC core, adjacent the drug binding pocket. The findings reveal a common mechanism by which diverse compounds stabilize the Kir6.2 N-terminus within SUR1's ABC core, allowing it to act as a firm 'handle' for the assembly of metastable mutant SUR1-Kir6.2 complexes.
History
DepositionFeb 25, 2022-
Header (metadata) releaseAug 31, 2022-
Map releaseAug 31, 2022-
UpdateNov 6, 2024-
Current statusNov 6, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_26321.png

Downloads & links

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Map

FileDownload / File: emd_26321.map.gz / Format: CCP4 / Size: 3.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesX (Sec.)Y (Row.)Z (Col.)
1.71 Å/pix.
x 115 pix.
= 196.65 Å		1.71 Å/pix.
x 75 pix.
= 128.25 Å		1.71 Å/pix.
x 94 pix.
= 160.74 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

generated in cubic-lattice coordinate

Voxel sizeX=Y=Z: 1.71 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 1.0
Minimum - Maximum-12.322386 - 14.347358
Average (Standard dev.)0.000000000006538 (±1.0)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin452944
Dimensions7594115
Spacing1157594
CellA: 196.65001 Å / B: 128.25 Å / C: 160.74 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : KATP-GBC-ATP-CTDup

EntireName: KATP-GBC-ATP-CTDup
Components
  • Complex: KATP-GBC-ATP-CTDup
    • Complex: Kir6.2
      • Protein or peptide: ATP-sensitive inward rectifier potassium channel 11
    • Complex: SUR1
      • Protein or peptide: ATP-binding cassette sub-family C member 8
  • Ligand: PHOSPHATIDYLETHANOLAMINE
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
  • Ligand: O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-L-serine
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose

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Supramolecule #1: KATP-GBC-ATP-CTDup

SupramoleculeName: KATP-GBC-ATP-CTDup / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Cricetus cricetus (black-bellied hamster)

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Supramolecule #2: Kir6.2

SupramoleculeName: Kir6.2 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1 / Details: Adenovirus-based infection of INS-1 cells
Source (natural)Organism: Cricetus cricetus (black-bellied hamster)

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Supramolecule #3: SUR1

SupramoleculeName: SUR1 / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2 / Details: Adenovirus-based infection of INS-1 cells
Source (natural)Organism: Rattus norvegicus (Norway rat)

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Macromolecule #1: ATP-sensitive inward rectifier potassium channel 11

MacromoleculeName: ATP-sensitive inward rectifier potassium channel 11 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Molecular weightTheoretical: 43.661762 KDa
Recombinant expressionOrganism: Rattus norvegicus (Norway rat)
SequenceString: MLSRKGIIPE EYVLTRLAED PTEPRYRTRE RRARFVSKKG NCNVAHKNIR EQGRFLQDVF TTLVDLKWPH TLLIFTMSFL CSWLLFAMV WWLIAFAHGD LAPGEGTNVP CVTSIHSFSS AFLFSIEVQV TIGFGGRMVT EECPLAILIL IVQNIVGLMI N AIMLGCIF ...String:
MLSRKGIIPE EYVLTRLAED PTEPRYRTRE RRARFVSKKG NCNVAHKNIR EQGRFLQDVF TTLVDLKWPH TLLIFTMSFL CSWLLFAMV WWLIAFAHGD LAPGEGTNVP CVTSIHSFSS AFLFSIEVQV TIGFGGRMVT EECPLAILIL IVQNIVGLMI N AIMLGCIF MKTAQAHRRA ETLIFSKHAV ITLRHGRLCF MLRVGDLRKS MIISATIHMQ VVRKTTSPEG EVVPLHQVDI PM ENGVGGN SIFLVAPLII YHVIDSNSPL YDLAPSDLHH HQDLEIIVIL EGVVETTGIT TQARTSYLAD EILWGQRFVP IVA EEDGRY SVDYSKFGNT VKVPTPLCTA RQLDEDRSLL DALTLASSRG PLRKRSVAVA KAKPKFSISP DSLS

UniProtKB: ATP-sensitive inward rectifier potassium channel 11

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Macromolecule #2: ATP-binding cassette sub-family C member 8

MacromoleculeName: ATP-binding cassette sub-family C member 8 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Cricetus cricetus (black-bellied hamster)
Molecular weightTheoretical: 177.333578 KDa
Recombinant expressionOrganism: Rattus norvegicus (Norway rat)
SequenceString: MPLAFCGTEN HSAAYRVDQG VLNNGCFVDA LNVVPHVFLL FITFPILFIG WGSQSSKVHI HHSTWLHFPG HNLRWILTFI LLFVLVCEI AEGILSDGVT ESRHLHLYMP AGMAFMAAIT SVVYYHNIET SNFPKLLIAL LIYWTLAFIT KTIKFVKFYD H AIGFSQLR ...String:
MPLAFCGTEN HSAAYRVDQG VLNNGCFVDA LNVVPHVFLL FITFPILFIG WGSQSSKVHI HHSTWLHFPG HNLRWILTFI LLFVLVCEI AEGILSDGVT ESRHLHLYMP AGMAFMAAIT SVVYYHNIET SNFPKLLIAL LIYWTLAFIT KTIKFVKFYD H AIGFSQLR FCLTGLLVIL YGMLLLVEVN VIRVRRYIFF KTPREVKPPE DLQDLGVRFL QPFVNLLSKG TYWWMNAFIK TA HKKPIDL RAIAKLPIAM RALTNYQRLC VAFDAQARKD TQSPQGARAI WRALCHAFGR RLILSSTFRI LADLLGFAGP LCI FGIVDH LGKENHVFQP KTQFLGVYFV SSQEFLGNAY VLAVLLFLAL LLQRTFLQAS YYVAIETGIN LRGAIQTKIY NKIM HMSTS NLSMGEMTAG QICNLVAIDT NQLMWFFFLC PNLWTMPVQI IVGVILLYYI LGVSALIGAA VIILLAPVQY FVATK LSQA QRTTLEHSNE RLKQTNEMLR GMKLLKLYAW ESIFCSRVEV TRRKEMTSLR AFAVYTSISI FMNTAIPIAA VLITFV GHV SFFKESDLSP SVAFASLSLF HILVTPLFLL SSVVRSTVKA LVSVQKLSEF LSSAEIREEQ CAPREPAPQG QAGKYQA VP LKVVNRKRPA REEVRDLLGP LQRLAPSMDG DADNFCVQII GGFFTWTPDG IPTLSNITIR IPRGQLTMIV GQVGCGKS S LLLATLGEMQ KVSGAVFWNS NLPDSEGEDP SSPERETAAG SDIRSRGPVA YASQKPWLLN ATVEENITFE SPFNKQRYK MVIEACSLQP DIDILPHGDQ TQIGERGINL SGGQRQRISV ARALYQQTNV VFLDDPFSAL DVHLSDHLMQ AGILELLRDD KRTVVLVTH KLQYLPHADW IIAMKDGTIQ REGTLKDFQR SECQLFEHWK TLMNRQDQEL EKETVMERKA SEPSQGLPRA M SSRDGLLL DEEEEEEEAA ESEEDDNLSS VLHQRAKIPW RACTKYLSSA GILLLSLLVF SQLLKHMVLV AIDYWLAKWT DS ALVLSPA ARNCSLSQEC DLDQSVYAMV FTLLCSLGIV LCLVTSVTVE WTGLKVAKRL HRSLLNRIIL APMRFFETTP LGS ILNRFS SDCNTIDQHI PSTLECLSRS TLLCVSALTV ISYVTPVFLV ALLPLAVVCY FIQKYFRVAS RDLQQLDDTT QLPL VSHFA ETVEGLTTIR AFRYEARFQQ KLLEYTDSNN IASLFLTAAN RWLEVCMEYI GACVVLIAAA TSISNSLHRE LSAGL VGLG LTYALMVSNY LNWMVRNLAD MEIQLGAVKR IHALLKTEAE SYEGLLAPSL IPKNWPDQGK IQIQNLSVRY DSSLKP VLK HVNTLISPGQ KIGICGRTGS GKSSFSLAFF RMVDMFEGRI IIDGIDIAKL PLHTLRSRLS IILQDPVLFS GTIRFNL DP EKKCSDSTLW EALEIAQLKL VVKALPGGLD AIITEGGENF SQGQRQLFCL ARAFVRKTSI FIMDEATASI DMATENIL Q KVVMTAFADR TVVTIAHRVH TILSADLVMV LKRGAILEFD KPETLLSQKD SVFASFVRAD K

UniProtKB: ATP-binding cassette sub-family C member 8

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Macromolecule #3: PHOSPHATIDYLETHANOLAMINE

MacromoleculeName: PHOSPHATIDYLETHANOLAMINE / type: ligand / ID: 3 / Number of copies: 8 / Formula: PTY
Molecular weightTheoretical: 734.039 Da
Chemical component information

ChemComp-PTY:
PHOSPHATIDYLETHANOLAMINE / phospholipid*YM

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Macromolecule #4: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(tri...

MacromoleculeName: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
type: ligand / ID: 4 / Number of copies: 5 / Formula: POV
Molecular weightTheoretical: 760.076 Da
Chemical component information

ChemComp-POV:
(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / phospholipid*YM

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Macromolecule #5: O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phospho...

MacromoleculeName: O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-L-serine
type: ligand / ID: 5 / Number of copies: 1 / Formula: P5S
Molecular weightTheoretical: 792.075 Da
Chemical component information

ChemComp-P5S:
O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-L-serine

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Macromolecule #6: ADENOSINE-5'-TRIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 6 / Number of copies: 1 / Formula: ATP
Molecular weightTheoretical: 507.181 Da
Chemical component information

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM

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Macromolecule #7: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 7 / Number of copies: 1 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.6 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: EMDB MAP
EMDB ID:

7073

Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 180000
Initial angle assignmentType: COMMON LINE
Final angle assignmentType: ANGULAR RECONSTITUTION

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Atomic model buiding 1

Initial model
PDB IDChain

6baa

chain_id: A, source_name: PDB, initial_model_type: experimental model

6baa

chain_id: B, source_name: PDB, initial_model_type: experimental model

6baa

chain_id: C, source_name: PDB, initial_model_type: experimental model

6baa

chain_id: D, source_name: PDB, initial_model_type: experimental model

6pz9

chain_id: E, source_name: PDB, initial_model_type: experimental model
Output model

PDB-7u2x:
Cryo-EM structure of the pancreatic ATP-sensitive potassium channel in the presence of carbamazepine and ATP with Kir6.2-CTD in the down conformation

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