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- EMDB-20528: Cryo-EM structure of the pancreatic beta-cell SUR1 bound to ATP a... -

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Basic information

Entry
Database: EMDB / ID: EMD-20528
TitleCryo-EM structure of the pancreatic beta-cell SUR1 bound to ATP and repaglinide
Map datapancreatic beta-cell SUR1 bound to ATP and repaglinide
Sample
  • Complex: KATP-RPG-ATP
    • Complex: SUR1
      • Protein or peptide: ATP-binding cassette sub-family C member 8
    • Complex: KATP
      • Protein or peptide: ATP-sensitive inward rectifier potassium channel 11
  • Ligand: Repaglinide
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
KeywordsKATP / SUR1 / RPG / MEMBRANE PROTEIN
Function / homology
Function and homology information


Regulation of insulin secretion / ATP sensitive Potassium channels / ABC-family proteins mediated transport / ATP-activated inward rectifier potassium channel activity / response to resveratrol / inward rectifying potassium channel / sulfonylurea receptor activity / ventricular cardiac muscle tissue development / cell body fiber / CAMKK-AMPK signaling cascade ...Regulation of insulin secretion / ATP sensitive Potassium channels / ABC-family proteins mediated transport / ATP-activated inward rectifier potassium channel activity / response to resveratrol / inward rectifying potassium channel / sulfonylurea receptor activity / ventricular cardiac muscle tissue development / cell body fiber / CAMKK-AMPK signaling cascade / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / regulation of monoatomic ion transmembrane transport / ATPase-coupled monoatomic cation transmembrane transporter activity / inward rectifier potassium channel activity / nervous system process / : / ankyrin binding / Ion homeostasis / response to ATP / response to stress / response to testosterone / potassium ion import across plasma membrane / action potential / intercalated disc / axolemma / voltage-gated potassium channel activity / potassium channel activity / ABC-type transporter activity / cellular response to nutrient levels / heat shock protein binding / potassium ion transmembrane transport / T-tubule / regulation of insulin secretion / acrosomal vesicle / response to ischemia / determination of adult lifespan / regulation of membrane potential / positive regulation of protein localization to plasma membrane / cellular response to glucose stimulus / negative regulation of insulin secretion / sarcolemma / potassium ion transport / 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 / apoptotic process / glutamatergic synapse / protein-containing complex / ATP hydrolysis activity / ATP binding / metal ion 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: 3.65 Å
AuthorsShyng SL / Yoshioka C
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK) 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
DepositionJul 31, 2019-
Header (metadata) releaseAug 14, 2019-
Map releaseAug 14, 2019-
UpdateMar 20, 2024-
Current statusMar 20, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0245
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.0245
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6pz9
  • Surface level: 0.0245
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_20528.png

Downloads & links

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Map

FileDownload / File: emd_20528.map.gz / Format: CCP4 / Size: 10.3 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationpancreatic beta-cell SUR1 bound to ATP and repaglinide
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.05 Å/pix.
x 171 pix.
= 178.695 Å		1.05 Å/pix.
x 121 pix.
= 126.445 Å		1.05 Å/pix.
x 131 pix.
= 136.895 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: 1.045 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0245 / Movie #1: 0.0245
Minimum - Maximum-0.10843204 - 0.1606396
Average (Standard dev.)0.0012538403 (±0.008765997)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin70140100
Dimensions121131171
Spacing131121171
CellA: 136.89499 Å / B: 126.44499 Å / C: 178.69499 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0451.0451.045
M x/y/z131121171
origin x/y/z0.0000.0000.000
length x/y/z136.895126.445178.695
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ162182277
MAP C/R/S123
start NC/NR/NS14070100
NC/NR/NS131121171
D min/max/mean-0.1080.1610.001

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Supplemental data

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Sample components

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Entire : KATP-RPG-ATP

EntireName: KATP-RPG-ATP
Components
  • Complex: KATP-RPG-ATP
    • Complex: SUR1
      • Protein or peptide: ATP-binding cassette sub-family C member 8
    • Complex: KATP
      • Protein or peptide: ATP-sensitive inward rectifier potassium channel 11
  • Ligand: Repaglinide
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE

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Supramolecule #1: KATP-RPG-ATP

SupramoleculeName: KATP-RPG-ATP / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2

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Supramolecule #2: SUR1

SupramoleculeName: SUR1 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: Cricetus cricetus (black-bellied hamster)

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Supramolecule #3: KATP

SupramoleculeName: KATP / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2
Source (natural)Organism: Rattus norvegicus (Norway rat)

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Macromolecule #1: ATP-binding cassette sub-family C member 8

MacromoleculeName: ATP-binding cassette sub-family C member 8 / type: protein_or_peptide / ID: 1 / 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 #2: ATP-sensitive inward rectifier potassium channel 11

MacromoleculeName: ATP-sensitive inward rectifier potassium channel 11 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Molecular weightTheoretical: 43.645719 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 ITPRHGRLCF 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 #3: Repaglinide

MacromoleculeName: Repaglinide / type: ligand / ID: 3 / Number of copies: 1 / Formula: BJX
Molecular weightTheoretical: 452.586 Da
Chemical component information

ChemComp-BJX:
Repaglinide

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Macromolecule #4: ADENOSINE-5'-TRIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 4 / 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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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
GridMaterial: GOLD
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: FEI FALCON III (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
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 reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.65 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 312000
Initial angle assignmentType: COMMON LINE
Final angle assignmentType: ANGULAR RECONSTITUTION

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Atomic model buiding 1

Initial modelPDB ID:

6baa


Chain - Source name: PDB / Chain - Initial model type: experimental model
Output model

PDB-6pz9:
Cryo-EM structure of the pancreatic beta-cell SUR1 bound to ATP and repaglinide

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