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- EMDB-6689: Structure of a Pancreatic ATP-sensitive Potassium Channel -

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Basic information

Entry
Database: EMDB / ID: EMD-6689
TitleStructure of a Pancreatic ATP-sensitive Potassium Channel
Map dataB factor sharpend map
Sample
  • Complex: ATP sensitive potassium
    • Complex: ATP-sensitive inward rectifier potassium channel 11
      • Protein or peptide: ATP-sensitive inward rectifier potassium channel 11,superfolder GFP
    • Complex: SUR1ABCC8
      • Protein or peptide: SUR1ABCC8
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 / cell body fiber / inward rectifying potassium channel / Regulation of insulin secretion / sulfonylurea receptor activity / CAMKK-AMPK signaling cascade / ABC-family proteins mediated transport ...ATP sensitive Potassium channels / response to resveratrol / ventricular cardiac muscle tissue development / ATP-activated inward rectifier potassium channel activity / 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 / action potential / ankyrin binding / response to ATP / response to testosterone / potassium ion import across plasma membrane / voltage-gated potassium channel activity / potassium ion binding / 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 / cellular response to glucose stimulus / positive regulation of protein localization to plasma membrane / sarcolemma / potassium ion transport / cellular response to nicotine / glucose metabolic process / 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
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 ...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
SUR1 / ATP-sensitive inward rectifier potassium channel 11
Similarity search - Component
Biological speciesMus musculus (house mouse) / synthetic construct (others) / Mesocricetus auratus (golden hamster)
Methodsingle particle reconstruction / cryo EM / Resolution: 5.6 Å
AuthorsLi N / Wu J-X / Chen L / Gao N
CitationJournal: Cell / Year: 2017
Title: Structure of a Pancreatic ATP-Sensitive Potassium Channel.
Authors: Ningning Li / Jing-Xiang Wu / Dian Ding / Jiaxuan Cheng / Ning Gao / Lei Chen /
Abstract: ATP-sensitive potassium channels (K) couple intracellular ATP levels with membrane excitability. These channels play crucial roles in many essential physiological processes and have been implicated ...ATP-sensitive potassium channels (K) couple intracellular ATP levels with membrane excitability. These channels play crucial roles in many essential physiological processes and have been implicated extensively in a spectrum of metabolic diseases and disorders. To gain insight into the mechanism of K, we elucidated the structure of a hetero-octameric pancreatic K channel in complex with a non-competitive inhibitor glibenclamide by single-particle cryoelectron microscopy to 5.6-Å resolution. The structure shows that four SUR1 regulatory subunits locate peripherally and dock onto the central Kir6.2 channel tetramer through the SUR1 TMD0-L0 fragment. Glibenclamide-bound SUR1 uses TMD0-L0 fragment to stabilize Kir6.2 channel in a closed conformation. In another structural population, a putative co-purified phosphatidylinositol 4,5-bisphosphate (PIP) molecule uncouples Kir6.2 from glibenclamide-bound SUR1. These structural observations suggest a molecular mechanism for K regulation by anti-diabetic sulfonylurea drugs, intracellular adenosine nucleotide concentrations, and PIP lipid.
History
DepositionDec 16, 2016-
Header (metadata) releaseJan 25, 2017-
Map releaseJan 25, 2017-
UpdateJan 25, 2017-
Current statusJan 25, 2017Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.09
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.09
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-5wua
  • Surface level: 0.09
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_6689.png

Downloads & links

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Map

FileDownload / File: emd_6689.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationB factor sharpend map
Voxel sizeX=Y=Z: 1.08 Å
Density
Contour LevelBy AUTHOR: 0.09 / Movie #1: 0.09
Minimum - Maximum-0.2745838 - 0.39600915
Average (Standard dev.)0.0019237909 (±0.015809448)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 324.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.081.081.08
M x/y/z300300300
origin x/y/z0.0000.0000.000
length x/y/z324.000324.000324.000
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS300300300
D min/max/mean-0.2750.3960.002

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Supplemental data

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Half map: #1

Fileemd_6689_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_6689_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : ATP sensitive potassium

EntireName: ATP sensitive potassium
Components
  • Complex: ATP sensitive potassium
    • Complex: ATP-sensitive inward rectifier potassium channel 11
      • Protein or peptide: ATP-sensitive inward rectifier potassium channel 11,superfolder GFP
    • Complex: SUR1ABCC8
      • Protein or peptide: SUR1ABCC8

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Supramolecule #1: ATP sensitive potassium

SupramoleculeName: ATP sensitive potassium / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Mus musculus (house mouse)
Recombinant expressionOrganism: Homo sapiens (human) / Recombinant cell: HEK / Recombinant plasmid: BacMam
Recombinant expressionOrganism: Homo sapiens (human) / Recombinant cell: HEK
Molecular weightTheoretical: 880 kDa/nm

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Supramolecule #2: ATP-sensitive inward rectifier potassium channel 11

SupramoleculeName: ATP-sensitive inward rectifier potassium channel 11 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1

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Supramolecule #3: SUR1

SupramoleculeName: SUR1 / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2

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

MacromoleculeName: ATP-sensitive inward rectifier potassium channel 11,superfolder GFP
type: protein_or_peptide / ID: 1
Details: ATP-sensitive inward rectifier potassium channel 11 with C-terminal synthetic superfolder GFP and affinity tags added
Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 76.339242 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MLSRKGIIPE EYVLTRLAED PAEPRYRTRE RRARFVSKKG NCNVAHKNIR EQGRFLQDVF TTLVDLKWPH TLLIFTMSFL CSWLLFAMV WWLIAFAHGD LAPGEGTNVP CVTSIHSFSS AFLFSIEVQV TIGFGGRMVT EECPLAILIL IVQNIVGLMI N AIMLGCIF ...String:
MLSRKGIIPE EYVLTRLAED PAEPRYRTRE RRARFVSKKG NCNVAHKNIR EQGRFLQDVF TTLVDLKWPH TLLIFTMSFL CSWLLFAMV WWLIAFAHGD LAPGEGTNVP CVTSIHSFSS AFLFSIEVQV TIGFGGRMVT EECPLAILIL IVQNIVGLMI N AIMLGCIF MKTAQAHRRA ETLIFSKHAV ITLRHGRLCF MLRVGDLRKS MIISATIHMQ VVRKTTSPEG EVVPLHQVDI PM ENGVGGN GIFLVAPLII YHVIDSNSPL YDLAPSDLHH HQDLEIIVIL EGVVETTGIT TQARTSYLAD EILWGQRFVP IVA EEDGRY SVDYSKFGNT IKVPTPLCTA RQLDEDRSLL DALTLASSRG PLRKRSVAVA KAKPKFSISP DSLSLELEVL FQGP GGKMS KGEELFTGVV PILVELDGDV NGHKFSVRGE GEGDATIGKL TLKFICTTGK LPVPWPTLVT TLTYGVQCFS RYPDH MKRH DFFKSAMPEG YVQERTISFK DDGKYKTRAV VKFEGDTLVN RIELKGTDFK EDGNILGHKL EYNFNSHNVY ITADKQ KNG IKANFTVRHN VEDGSVQLAD HYQQNTPIGD GPVLLPDNHY LSTQTKLSKD PNEKRDHMVL HEYVNAAGIT HHHHHHH HS SGLVPRGSGW SHPQFEKGSG DYKDDDDKGS GWSHPQFEK

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Macromolecule #2: SUR1

MacromoleculeName: SUR1 / type: protein_or_peptide / ID: 2 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Mesocricetus auratus (golden hamster)
Molecular weightTheoretical: 177.296578 KDa
Recombinant expressionOrganism: Homo sapiens (human)
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 RAIGKLPIAM RALTNYQRLC VAFDAQARKD TQSPQGARAI WRALCHAFGR RLILSSTFRI LADLLGFAGP LCI FGIVDH LGKENHVFQP KTQFLGVYFV SSQEFLGNAY VLAVLLFLAL LLQRTFLQAS YYVAIETGIN LRGAIQTKIY NKIM HLSTS NLSMGEMTAG QICNLVAIDT NQLMWFFFLC PNLWAMPVQI IVGVILLYYI LGVSALIGAA VIILLAPVQY FVATK LSQA QRSTLEHSNE RLKQTNEMLR GMKLLKLYAW ESIFCSRVEV TRRKEMTSLR AFAVYTSISI FMNTAIPIAA VLITFV GHV SFFKESDLSP SVAFASLSLF HILVTPLFLL SSVVRSTVKA LVSVKKLSEF 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 LSHFA ETVEGLTTIR AFRYEARFQQ KLLEYTDSNN IASLFLTAAN RWLEVRMEYI GACVVLIAAA TSISNSLHRE LSAGL VGLG LTYALMVSNY LNWMVRNLAD MEIQLGAVKR IHALLKTEAE SYEGLLAPSL IPKNWPDQGK IQIQNLSVRY DSSLKP VLK HVNALISPGQ KIGICGRTGS GKSSFSLAFF RMVDMFEGRI IIDGIDIAKL PLHTLRSRLS IILQDPVLFS GTIRFNL DP EKKCSDSTLW EALEIAQLKL VVKALPGGLD AIITEGGENF SQGQRQLFCL ARAFVRKTSI FIMDEATASI DMATENIL Q KVVMTAFADR TVVTIAHRVH TILSADLVMV LKRGAILEFD KPETLLSQKD SVFASFVRAD K

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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
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Image recordingFilm or detector model: FEI FALCON II (4k x 4k) / Detector mode: INTEGRATING / Average electron dose: 40.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Initial angle assignmentType: OTHER
Final angle assignmentType: OTHER
Final reconstructionApplied symmetry - Point group: C4 (4 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 5.6 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: relion (ver. 2.0) / Number images used: 34500
FSC plot (resolution estimation)

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