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- PDB-6baa: Cryo-EM structure of the pancreatic beta-cell KATP channel bound ... -

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Basic information

Entry
Database: PDB / ID: 6baa
TitleCryo-EM structure of the pancreatic beta-cell KATP channel bound to ATP and glibenclamide
Components
  • ATP-binding cassette sub-family C member 8
  • ATP-sensitive inward rectifier potassium channel 11
KeywordsMETAL TRANSPORT / KATP / SUR1 / Kir6.2 / sulfonylurea receptor
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
G protein-activated inward rectifier potassium channel 1 / 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 ...G protein-activated inward rectifier potassium channel 1 / 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 / : / Helix Hairpins - #70 / 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. / Helix Hairpins / Immunoglobulin E-set / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / Immunoglobulin-like / Sandwich / P-loop containing nucleoside triphosphate hydrolase / Orthogonal Bundle / Mainly Beta / Mainly Alpha
Similarity search - Domain/homology
ADENOSINE-5'-TRIPHOSPHATE / Chem-GBM / ATP-sensitive inward rectifier potassium channel 11 / ATP-binding cassette sub-family C member 8
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
Cricetus cricetus (black-bellied hamster)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.63 Å
AuthorsMartin, G.M. / Yoshioka, C. / Shyng, S.L.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK) United States
CitationJournal: Elife / Year: 2017
Title: Anti-diabetic drug binding site in a mammalian K channel revealed by Cryo-EM.
Authors: Gregory M Martin / Balamurugan Kandasamy / Frank DiMaio / Craig Yoshioka / Show-Ling Shyng /
Abstract: Sulfonylureas are anti-diabetic medications that act by inhibiting pancreatic K channels composed of SUR1 and Kir6.2. The mechanism by which these drugs interact with and inhibit the channel has been ...Sulfonylureas are anti-diabetic medications that act by inhibiting pancreatic K channels composed of SUR1 and Kir6.2. The mechanism by which these drugs interact with and inhibit the channel has been extensively investigated, yet it remains unclear where the drug binding pocket resides. Here, we present a cryo-EM structure of a hamster SUR1/rat Kir6.2 channel bound to a high-affinity sulfonylurea drug glibenclamide and ATP at 3.63 Å resolution, which reveals unprecedented details of the ATP and glibenclamide binding sites. Importantly, the structure shows for the first time that glibenclamide is lodged in the transmembrane bundle of the SUR1-ABC core connected to the first nucleotide binding domain near the inner leaflet of the lipid bilayer. Mutation of residues predicted to interact with glibenclamide in our model led to reduced sensitivity to glibenclamide. Our structure provides novel mechanistic insights of how sulfonylureas and ATP interact with the K channel complex to inhibit channel activity.
History
DepositionOct 12, 2017Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 1, 2017Provider: repository / Type: Initial release
Revision 1.1Feb 28, 2018Group: Database references / Category: citation / Item: _citation.title
Revision 1.2Mar 28, 2018Group: Data collection / Database references / Category: citation / Item: _citation.title
Revision 1.3Dec 25, 2019Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization

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Structure visualization

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Assembly

Deposited unit
A: ATP-sensitive inward rectifier potassium channel 11
B: ATP-sensitive inward rectifier potassium channel 11
C: ATP-sensitive inward rectifier potassium channel 11
D: ATP-sensitive inward rectifier potassium channel 11
E: ATP-binding cassette sub-family C member 8
F: ATP-binding cassette sub-family C member 8
G: ATP-binding cassette sub-family C member 8
H: ATP-binding cassette sub-family C member 8
hetero molecules


Theoretical massNumber of molelcules
Total (without water)887,92216
Polymers883,9178
Non-polymers4,0058
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: native gel electrophoresis
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area41760 Å2
ΔGint-312 kcal/mol
Surface area299500 Å2

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Components

#1: Protein
ATP-sensitive inward rectifier potassium channel 11 / BIR / Inward rectifier K(+) channel Kir6.2 / Potassium channel / inwardly rectifying subfamily J member 11


Mass: 43645.719 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Kcnj11 / Cell line (production host): INS-1 / Production host: Rattus norvegicus (Norway rat) / References: UniProt: P70673
#2: Protein
ATP-binding cassette sub-family C member 8 / Sulfonylurea receptor 1


Mass: 177333.578 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Cricetus cricetus (black-bellied hamster)
Gene: ABCC8, SUR / Production host: Rattus norvegicus (Norway rat) / References: UniProt: Q09427
#3: Chemical
ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP, energy-carrying molecule*YM
#4: Chemical
ChemComp-GBM / 5-chloro-N-(2-{4-[(cyclohexylcarbamoyl)sulfamoyl]phenyl}ethyl)-2-methoxybenzamide / Glibenclamide, Glyburide


Mass: 494.004 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C23H28ClN3O5S / Feature type: SUBJECT OF INVESTIGATION / Comment: medication*YM

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1Pancreatic beta-cell ATP-sensitive K+ channel (KATP)COMPLEX#1-#20RECOMBINANT
2ATP-sensitive K+ channel subunit Kir6.2COMPLEX#11RECOMBINANT
3ATP-binding cassette sub-family C member 8COMPLEX#21RECOMBINANT
Molecular weightValue: 0.95 MDa / Experimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
11Rattus norvegicus (Norway rat)10116
21Cricetus cricetus (black-bellied hamster)10034
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
11Rattus norvegicus (Norway rat)10116
21Rattus norvegicus (Norway rat)10116
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C4 (4 fold cyclic)
3D reconstructionResolution: 3.63 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 59417 / Symmetry type: POINT

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