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- EMDB-23880: Vascular KATP channel: Kir6.1 SUR2B quatrefoil-like conformation 1 -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-23880 | |||||||||
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Title | Vascular KATP channel: Kir6.1 SUR2B quatrefoil-like conformation 1 | |||||||||
![]() | sharpened-Q1-S4-Final2021 | |||||||||
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![]() | KATP / potassium channel / vascular / TRANSPORT PROTEIN | |||||||||
Function / homology | ![]() cardiac pacemaker cell differentiation / atrioventricular node cell differentiation / vascular process in circulatory system / substrate-dependent cell migration, cell contraction / reactive oxygen species biosynthetic process / oxygen metabolic process / reactive gliosis / ATP sensitive Potassium channels / response to decreased oxygen levels / potassium channel activator activity ...cardiac pacemaker cell differentiation / atrioventricular node cell differentiation / vascular process in circulatory system / substrate-dependent cell migration, cell contraction / reactive oxygen species biosynthetic process / oxygen metabolic process / reactive gliosis / ATP sensitive Potassium channels / response to decreased oxygen levels / potassium channel activator activity / ABC-family proteins mediated transport / response to peptide / response to resveratrol / ATP-activated inward rectifier potassium channel activity / membrane repolarization during ventricular cardiac muscle cell action potential / glutamate secretion, neurotransmission / inward rectifying potassium channel / sulfonylurea receptor activity / ventricular cardiac muscle tissue development / NLRP3 inflammasome complex assembly / voltage-gated potassium channel activity involved in ventricular cardiac muscle cell action potential repolarization / response to potassium ion / CAMKK-AMPK signaling cascade / circulatory system development / cardiac conduction / response to oxygen levels / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / cellular response to potassium ion / response to hydrogen sulfide / cellular respiration / cellular response to chemical stress / ATPase-coupled monoatomic cation transmembrane transporter activity / regulation of monoatomic ion transmembrane transport / coronary vasculature development / vasculature development / cardiac muscle cell contraction / regulation of potassium ion transmembrane transport / synaptic assembly at neuromuscular junction / nervous system process / syntaxin binding / inorganic cation transmembrane transport / blood circulation / Ion homeostasis / cellular response to ATP / neuromuscular process / sulfonylurea receptor binding / response to ATP / heterocyclic compound binding / response to stress / establishment of cell polarity / myofibril / blood vessel development / transmission of nerve impulse / fat cell differentiation / potassium ion import across plasma membrane / p38MAPK cascade / response to exogenous dsRNA / fatty acid oxidation / monoatomic cation transmembrane transport / protein secretion / potassium channel activity / action potential / ATPase-coupled transmembrane transporter activity / ABC-type transporter activity / potassium channel regulator activity / fatty acid transport / ATP metabolic process / heart morphogenesis / skeletal muscle tissue development / negative regulation of blood pressure / presynaptic active zone membrane / T-tubule / potassium ion transmembrane transport / response to endoplasmic reticulum stress / cellular response to calcium ion / regulation of heart rate / response to cytokine / sarcomere / blood vessel diameter maintenance / acrosomal vesicle / regulation of membrane potential / response to ischemia / kidney development / response to activity / mitochondrion organization / determination of adult lifespan / response to insulin / microglial cell activation / potassium ion transport / sarcolemma / response to hydrogen peroxide / regulation of blood pressure / calcium ion transmembrane transport / transmembrane transport / response to estrogen / vasodilation / MAPK cascade / cellular response to xenobiotic stimulus / presynapse / heart development Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 4.0 Å | |||||||||
![]() | Sung MW / Shyng SL | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Vascular K channel structural dynamics reveal regulatory mechanism by Mg-nucleotides. Authors: Min Woo Sung / Zhongying Yang / Camden M Driggers / Bruce L Patton / Barmak Mostofian / John D Russo / Daniel M Zuckerman / Show-Ling Shyng / ![]() Abstract: Vascular tone is dependent on smooth muscle K channels comprising pore-forming Kir6.1 and regulatory SUR2B subunits, in which mutations cause Cantú syndrome. Unique among K isoforms, they lack ...Vascular tone is dependent on smooth muscle K channels comprising pore-forming Kir6.1 and regulatory SUR2B subunits, in which mutations cause Cantú syndrome. Unique among K isoforms, they lack spontaneous activity and require Mg-nucleotides for activation. Structural mechanisms underlying these properties are unknown. Here, we determined cryogenic electron microscopy structures of vascular K channels bound to inhibitory ATP and glibenclamide, which differ informatively from similarly determined pancreatic K channel isoform (Kir6.2/SUR1). Unlike SUR1, SUR2B subunits adopt distinct rotational "propeller" and "quatrefoil" geometries surrounding their Kir6.1 core. The glutamate/aspartate-rich linker connecting the two halves of the SUR-ABC core is observed in a quatrefoil-like conformation. Molecular dynamics simulations reveal MgADP-dependent dynamic tripartite interactions between this linker, SUR2B, and Kir6.1. The structures captured implicate a progression of intermediate states between MgADP-free inactivated, and MgADP-bound activated conformations wherein the glutamate/aspartate-rich linker participates as mobile autoinhibitory domain, suggesting a conformational pathway toward K channel activation. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 2.4 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 15.4 KB 15.4 KB | Display Display | ![]() |
Images | ![]() | 103.5 KB | ||
Filedesc metadata | ![]() | 7.2 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 486 KB | Display | ![]() |
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Full document | ![]() | 485.6 KB | Display | |
Data in XML | ![]() | 4.5 KB | Display | |
Data in CIF | ![]() | 5.1 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7mjoMC ![]() 7mitC ![]() 7mjpC ![]() 7mjqC C: citing same article ( M: atomic model generated by this map |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | sharpened-Q1-S4-Final2021 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. generated in cubic-lattice coordinate | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.653 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Vascular KATP channel: Kir6.1 SUR2B quatrefoil-like conformation 2
Entire | Name: Vascular KATP channel: Kir6.1 SUR2B quatrefoil-like conformation 2 |
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Components |
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-Supramolecule #1: Vascular KATP channel: Kir6.1 SUR2B quatrefoil-like conformation 2
Supramolecule | Name: Vascular KATP channel: Kir6.1 SUR2B quatrefoil-like conformation 2 type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2 |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 889 KDa |
-Macromolecule #1: ATP-sensitive inward rectifier potassium channel 8
Macromolecule | Name: ATP-sensitive inward rectifier potassium channel 8 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 48.023871 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MLARKSIIPE EYVLARIAAE NLRKPRIRDR LPKARFIAKS GACNLAHKNI REQGRFLQDI FTTLVDLKWR HTLVIFTMSF LCSWLLFAI MWWLVAFAHG DIYAYMEKGI TEKSGLESAV CVTNVRSFTS AFLFSIEVQV TIGFGGRMMT EECPLAITVL I LQNIVGLI ...String: MLARKSIIPE EYVLARIAAE NLRKPRIRDR LPKARFIAKS GACNLAHKNI REQGRFLQDI FTTLVDLKWR HTLVIFTMSF LCSWLLFAI MWWLVAFAHG DIYAYMEKGI TEKSGLESAV CVTNVRSFTS AFLFSIEVQV TIGFGGRMMT EECPLAITVL I LQNIVGLI INAVMLGCIF MKTAQAHRRA ETLIFSRHAV IAVRNGKLCF MFRVGDLRKS MIISASVRIQ VVKKTTTPEG EV VPIHQQD IPVDNPIESN NIFLVAPLII CHVIDKRSPL YDISATDLVN QDLEVIVILE GVVETTGITT QARTSYIAEE IQW GHRFVS IVTEEEGVYS VDYSKFGNTV RVAAPRCSAR ELDEKPSILI QTLQKSELSH QNSLRKRNSM RRNNSMRRSN SIRR NNSSL MVPKVQFMTP EGNQCPSES UniProtKB: ATP-sensitive inward rectifier potassium channel 8 |
-Macromolecule #2: Isoform SUR2B of ATP-binding cassette sub-family C member 9
Macromolecule | Name: Isoform SUR2B of ATP-binding cassette sub-family C member 9 type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 174.488562 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MSLSFCGNNI SSYNIYHGVL QNPCFVDALN LVPHVFLLFI TFPILFIGWG SQSSKVQIHH NTWLHFPGHN LRWILTFALL FVHVCEIAE GIVSDSQRAS RHLHLFMPAV MGFVATTTSI VYYHNIETSN FPKLLLALFL YWVMAFITKT IKLVKYWQLG W GMSDLRFC ...String: MSLSFCGNNI SSYNIYHGVL QNPCFVDALN LVPHVFLLFI TFPILFIGWG SQSSKVQIHH NTWLHFPGHN LRWILTFALL FVHVCEIAE GIVSDSQRAS RHLHLFMPAV MGFVATTTSI VYYHNIETSN FPKLLLALFL YWVMAFITKT IKLVKYWQLG W GMSDLRFC ITGVMVILNG LLMAVEINVI RVRRYVFFMN PQKVKPPEDL QDLGVRFLQP FVNLLSKATY WWMNTLIISA HR KPIDLKA IGKLPIAMRA VTNYVCLKEA YEEQKKKAAD HPNRTPSIWL AMYRAFGRPI LLSSTFRYLA DLLGFAGPLC ISG IVQRVN EPKNNTTRFS ETLSSKEFLE NAHVLAVLLF LALILQRTFL QASYYVTIET GINLRGALLA MIYNKILRLS TSNL SMGEM TLGQINNLVA IETNQLMWFL FLCPNLWAMP VQIIMGVILL YNLLGSSALV GAAVIVLLAP IQYFIATKLA EAQKS TLDY STERLKKTNE ILKGIKLLKL YAWEHIFCKS VEETRMKELS SLKTFALYTS LSIFMNAAIP IAAVLATFVT HAYASG NNL KPAEAFASLS LFHILVTPLF LLSTVVRFAV KAIISVQKLN EFLLSDEIGE DSWRTGEGTL PFESCKKHTG VQSKPIN RK QPGRYHLDNY EQARRLRPAE TEDVAIKVTN GYFSWGSGLA TLSNIDIRIP TGQLTMIVGQ VGCGKSSLLL AILGEMQT L EGKVYWNNVN ESEPSFEATR SRSRYSVAYA AQKPWLLNAT VEENITFGSS FNRQRYKAVT DACSLQPDID LLPFGDQTE IGERGINLSG GQRQRICVAR ALYQNTNIVF LDDPFSALDI HLSDHLMQEG ILKFLQDDKR TVVLVTHKLQ YLTHADWIIA MKDGSVLRE GTLKDIQTKD VELYEHWKTL MNRQDQELEK DMEADQTTLE RKTLRRAMYS REAKAQMEDE DEEEEEEEDE D DNMSTVMR LRTKMPWKTC WWYLTSGGFF LLFLMIFSKL LKHSVIVAID YWLATWTSEY SINDPGKADQ TFYVAGFSIL CG AGIFLCL VTSLTVEWMG LTAAKNLHHN LLNKIILGPI RFFDTTPLGL ILNRFSADTN IIDQHIPPTL ESLTRSTLLC LSA IGMISY ATPVFLIALA PLGVAFYFIQ KYFRVASKDL QELDDSTQLP LLCHFSETAE GLTTIRAFRH ETRFKQRMLE LTDT NNIAY LFLSAANRWL EVRTDYLGAC IVLTASIASI SGSSNSGLVG LGLLYALTIT NYLNWVVRNL ADLEVQMGAV KKVNS FLTM ESENYEGTMD PSQVPEHWPQ EGEIKIHDLC VRYENNLKPV LKHVKAYIKP GQKVGICGRT GSGKSSLSLA FFRMVD IFD GKIVIDGIDI SKLPLHTLRS RLSIILQDPI LFSGSIRFNL DPECKCTDDR LWEALEIAQL KNMVKSLPGG LDATVTE GG ENFSVGQRQL FCLARAFVRK SSILIMDEAT ASIDMATENI LQKVVMTAFA DRTVVTIAHR VHTILTADLV IVMKRGNI L EYDTPESLLA QEDGVFASFV RADM UniProtKB: ATP-binding cassette sub-family C member 9 |
-Macromolecule #4: POTASSIUM ION
Macromolecule | Name: POTASSIUM ION / type: ligand / ID: 4 / Number of copies: 2 / Formula: K |
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Molecular weight | Theoretical: 39.098 Da |
-Macromolecule #5: ADENOSINE-5'-TRIPHOSPHATE
Macromolecule | Name: ADENOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 5 / Number of copies: 5 / Formula: ATP |
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Molecular weight | Theoretical: 507.181 Da |
Chemical component information | ![]() ChemComp-ATP: |
-Macromolecule #6: PHOSPHATIDYLETHANOLAMINE
Macromolecule | Name: PHOSPHATIDYLETHANOLAMINE / type: ligand / ID: 6 / Number of copies: 10 / Formula: PTY |
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Molecular weight | Theoretical: 734.039 Da |
Chemical component information | ![]() ChemComp-PTY: |
-Macromolecule #7: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(tri...
Macromolecule | Name: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate type: ligand / ID: 7 / Number of copies: 3 / Formula: POV |
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Molecular weight | Theoretical: 760.076 Da |
Chemical component information | ![]() ChemComp-POV: |
-Macromolecule #8: 5-chloro-N-(2-{4-[(cyclohexylcarbamoyl)sulfamoyl]phenyl}ethyl)-2-...
Macromolecule | Name: 5-chloro-N-(2-{4-[(cyclohexylcarbamoyl)sulfamoyl]phenyl}ethyl)-2-methoxybenzamide type: ligand / ID: 8 / Number of copies: 1 / Formula: GBM |
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Molecular weight | Theoretical: 494.004 Da |
Chemical component information | ![]() ChemComp-GBM: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 |
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Grid | Model: Quantifoil R2/1 / Support film - Material: GRAPHENE OXIDE |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 40.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: INSILICO MODEL |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 4.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 71880 |
Initial angle assignment | Type: COMMON LINE |
Final angle assignment | Type: ANGULAR RECONSTITUTION |