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- PDB-6jb1: Structure of pancreatic ATP-sensitive potassium channel bound wit... -

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Basic information

Entry
Database: PDB / ID: 6jb1
TitleStructure of pancreatic ATP-sensitive potassium channel bound with repaglinide and ATPgammaS at 3.3A resolution
Components
  • ATP-binding cassette sub-family C member 8 isoform X2
  • ATP-sensitive inward rectifier potassium channel 11
KeywordsMEMBRANE PROTEIN / KATP / channel / repaglinide / Kir / ABC transporter / SUR / diabetes / insulin secretagogue
Function / homology
Function and homology information


ATP sensitive Potassium channels / response to resveratrol / ventricular cardiac muscle tissue development / ATP-activated inward rectifier potassium channel activity / glutamate secretion, neurotransmission / cell body fiber / inward rectifying potassium channel / Regulation of insulin secretion / sulfonylurea receptor activity / CAMKK-AMPK signaling cascade ...ATP sensitive Potassium channels / response to resveratrol / ventricular cardiac muscle tissue development / ATP-activated inward rectifier potassium channel activity / glutamate secretion, neurotransmission / cell body fiber / inward rectifying potassium channel / Regulation of insulin secretion / sulfonylurea receptor activity / CAMKK-AMPK signaling cascade / ABC-family proteins mediated transport / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / Ion homeostasis / inward rectifier potassium channel activity / ATPase-coupled monoatomic cation transmembrane transporter activity / nervous system process / regulation of monoatomic ion transmembrane transport / inorganic cation transmembrane transport / neuromuscular process / action potential / ankyrin binding / response to ATP / response to testosterone / potassium ion import across plasma membrane / positive regulation of insulin secretion involved in cellular response to glucose stimulus / voltage-gated potassium channel activity / potassium ion binding / potassium channel activity / regulation of insulin secretion / axolemma / intercalated disc / negative regulation of insulin secretion / ABC-type transporter activity / potassium ion transmembrane transport / T-tubule / heat shock protein binding / regulation of membrane potential / acrosomal vesicle / response to ischemia / determination of adult lifespan / ADP binding / cellular response to glucose stimulus / positive regulation of protein localization to plasma membrane / sarcolemma / potassium ion transport / cellular response to nicotine / glucose metabolic process / presynapse / response to estradiol / presynaptic membrane / nuclear envelope / cellular response to tumor necrosis factor / transmembrane transporter binding / response to hypoxia / endosome / response to xenobiotic stimulus / neuronal cell body / glutamatergic synapse / apoptotic process / ATP hydrolysis activity / ATP binding / plasma membrane
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
PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / Repaglinide / Chem-POV / PHOSPHATIDYLETHANOLAMINE / ATP-binding cassette sub-family C member 8 isoform X2 / ATP-sensitive inward rectifier potassium channel 11
Similarity search - Component
Biological speciesMus musculus (house mouse)
Mesocricetus auratus (golden hamster)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsChen, L. / Ding, D. / Wang, M. / Wu, J.-X. / Kang, Y.
Funding support China, 4items
OrganizationGrant numberCountry
Ministry of Science and Technology (China)2016YFA0502004 China
National Natural Science Foundation of China31622021 China
National Natural Science Foundation of China31821091 China
National Natural Science Foundation of China31870833 China
CitationJournal: Cell Rep / Year: 2019
Title: The Structural Basis for the Binding of Repaglinide to the Pancreatic K Channel.
Authors: Dian Ding / Mengmeng Wang / Jing-Xiang Wu / Yunlu Kang / Lei Chen /
Abstract: Repaglinide (RPG) is a short-acting insulin secretagogue widely prescribed for the treatment of type 2 diabetes. It boosts insulin secretion by inhibiting the pancreatic ATP-sensitive potassium ...Repaglinide (RPG) is a short-acting insulin secretagogue widely prescribed for the treatment of type 2 diabetes. It boosts insulin secretion by inhibiting the pancreatic ATP-sensitive potassium channel (K). However, the mechanisms by which RPG binds to the K channel are poorly understood. Here, we describe two cryo-EM structures: the pancreatic K channel in complex with inhibitory RPG and adenosine-5'-(γ-thio)-triphosphate (ATPγS) at 3.3 Å and a medium-resolution structure of a RPG-bound mini SUR1 protein in which the N terminus of the inward-rectifying potassium channel 6.1 (Kir6.1) is fused to the ABC transporter module of the sulfonylurea receptor 1 (SUR1). These structures reveal the binding site of RPG in the SUR1 subunit. Furthermore, the high-resolution structure reveals the complex architecture of the ATP binding site, which is formed by both Kir6.2 and SUR1 subunits, and the domain-domain interaction interfaces.
History
DepositionJan 25, 2019Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0May 22, 2019Provider: repository / Type: Initial release
Revision 1.1Nov 6, 2019Group: Data collection / Other / Category: atom_sites / cell
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] ..._atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][3] / _cell.Z_PDB
Revision 2.0Sep 29, 2021Group: Advisory / Atomic model ...Advisory / Atomic model / Data collection / Database references
Category: atom_site / database_2 ...atom_site / database_2 / database_PDB_caveat / pdbx_unobs_or_zero_occ_atoms / pdbx_validate_chiral
Item: _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ..._atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_atom_id / _atom_site.label_atom_id / _atom_site.type_symbol / _database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_unobs_or_zero_occ_atoms.auth_atom_id / _pdbx_unobs_or_zero_occ_atoms.label_atom_id

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Structure visualization

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Assembly

Deposited unit
A: ATP-sensitive inward rectifier potassium channel 11
B: ATP-binding cassette sub-family C member 8 isoform X2
C: ATP-sensitive inward rectifier potassium channel 11
D: ATP-binding cassette sub-family C member 8 isoform X2
E: ATP-sensitive inward rectifier potassium channel 11
F: ATP-binding cassette sub-family C member 8 isoform X2
G: ATP-sensitive inward rectifier potassium channel 11
H: ATP-binding cassette sub-family C member 8 isoform X2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)933,66676
Polymers883,6458
Non-polymers50,02168
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 2 types, 8 molecules ACEGBDFH

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


Mass: 43615.734 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: Kcnj11 / Production host: Homo sapiens (human) / References: UniProt: Q61743
#2: Protein
ATP-binding cassette sub-family C member 8 isoform X2 / SUR1


Mass: 177295.516 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mesocricetus auratus (golden hamster) / Gene: Abcc8 / Production host: Homo sapiens (human) / References: UniProt: A0A1U7R319

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Non-polymers , 5 types, 68 molecules

#3: Chemical...
ChemComp-POV / (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / POPC / POPC


Mass: 760.076 Da / Num. of mol.: 36 / Source method: obtained synthetically / Formula: C42H82NO8P / Comment: phospholipid*YM
#4: Chemical
ChemComp-AGS / PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / ATP-GAMMA-S / ADENOSINE 5'-(3-THIOTRIPHOSPHATE) / ADENOSINE 5'-(GAMMA-THIOTRIPHOSPHATE) / ADENOSINE-5'-DIPHOSPHATE MONOTHIOPHOSPHATE


Mass: 523.247 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: C10H16N5O12P3S / Comment: ATP-gamma-S, energy-carrying molecule analogue*YM
#5: Chemical
ChemComp-AJP / Digitonin / Digitonin


Mass: 1229.312 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C56H92O29 / Comment: detergent*YM
#6: Chemical
ChemComp-BJX / Repaglinide / 2-ethoxy-4-[2-({(1S)-3-methyl-1-[2-(piperidin-1-yl)phenyl]butyl}amino)-2-oxoethyl]benzoic acid / Repaglinide


Mass: 452.586 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C27H36N2O4 / Comment: medication*YM
#7: Chemical
ChemComp-PTY / PHOSPHATIDYLETHANOLAMINE / Phosphatidylethanolamine


Mass: 734.039 Da / Num. of mol.: 16 / Source method: obtained synthetically / Formula: C40H80NO8P / Comment: phospholipid*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

ComponentName: KATPATP-sensitive potassium channel / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Source (natural)Organism: Mus musculus (house mouse)
Source (recombinant)Organism: Homo sapiens (human)
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 FIELDBright-field microscopy
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K2 QUANTUM (4k x 4k)

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Processing

EM softwareName: RELION / Version: 2 / Category: 3D reconstruction
CTF correctionType: NONE
SymmetryPoint symmetry: C4 (4 fold cyclic)
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 277548 / Symmetry type: POINT

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