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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-8911 | |||||||||
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Title | Cryo-EM structure of a mitochondrial calcium uniporter | |||||||||
![]() | Single-particle cryo-EM reconstruction of the N. crassa mitochondrial calcium uniporter | |||||||||
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![]() | mitochondrial calcium uniporter / calcium-selective ion channel / calcium uptake / uniporter / TRANSPORT PROTEIN | |||||||||
Function / homology | ![]() : / uniporter activity / uniplex complex / mitochondrial calcium ion homeostasis / calcium import into the mitochondrion / calcium channel activity / identical protein binding Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.7 Å | |||||||||
![]() | Yoo J / Wu M | |||||||||
![]() | ![]() Title: Cryo-EM structure of a mitochondrial calcium uniporter. Authors: Jiho Yoo / Mengyu Wu / Ying Yin / Mark A Herzik / Gabriel C Lander / Seok-Yong Lee / ![]() Abstract: Calcium transport plays an important role in regulating mitochondrial physiology and pathophysiology. The mitochondrial calcium uniporter (MCU) is a calcium-selective ion channel that is the primary ...Calcium transport plays an important role in regulating mitochondrial physiology and pathophysiology. The mitochondrial calcium uniporter (MCU) is a calcium-selective ion channel that is the primary mediator for calcium uptake into the mitochondrial matrix. Here, we present the cryo-electron microscopy structure of the full-length MCU from to an overall resolution of ~3.7 angstroms. Our structure reveals a tetrameric architecture, with the soluble and transmembrane domains adopting different symmetric arrangements within the channel. The conserved W-D-Φ-Φ-E-P-V-T-Y sequence motif of MCU pore forms a selectivity filter comprising two acidic rings separated by one helical turn along the central axis of the channel pore. The structure combined with mutagenesis gives insight into the basis of calcium recognition. | |||||||||
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 | ![]() | 59.6 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 16.8 KB 16.8 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 9.1 KB | Display | ![]() |
Images | ![]() | 155.8 KB | ||
Filedesc metadata | ![]() | 5.7 KB | ||
Others | ![]() ![]() | 48.3 MB 48.3 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6dt0MC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Map
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Annotation | Single-particle cryo-EM reconstruction of the N. crassa mitochondrial calcium uniporter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.15 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Half map: N. crassa mitochondrial calcium uniporter, half map 1
File | emd_8911_half_map_1.map | ||||||||||||
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Annotation | N. crassa mitochondrial calcium uniporter, half map 1 | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: N. crassa mitochondrial calcium uniporter, half map 2
File | emd_8911_half_map_2.map | ||||||||||||
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Annotation | N. crassa mitochondrial calcium uniporter, half map 2 | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Mitochondrial Calcium Uniporter
Entire | Name: Mitochondrial Calcium Uniporter |
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Components |
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-Supramolecule #1: Mitochondrial Calcium Uniporter
Supramolecule | Name: Mitochondrial Calcium Uniporter / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: Mitochondrial calcium uniporter
Macromolecule | Name: Mitochondrial calcium uniporter / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 52.948117 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MASTSVSPKT RETEAEAKAK KLDQKRLDEH EEEVRAREQQ VRRPWHREGA DKPPVEGNAD PIAKGKLLTT PTRLLKLILP LPLRVEKDQ KNNGRNNEYG RSISLNSDIQ PLALLIHPQQ PLSYVERLIQ AELPPVVENG QEKIPNVYFR AEDSEQGDQK P TSRAEARS ...String: MASTSVSPKT RETEAEAKAK KLDQKRLDEH EEEVRAREQQ VRRPWHREGA DKPPVEGNAD PIAKGKLLTT PTRLLKLILP LPLRVEKDQ KNNGRNNEYG RSISLNSDIQ PLALLIHPQQ PLSYVERLIQ AELPPVVENG QEKIPNVYFR AEDSEQGDQK P TSRAEARS KDDGGEPSEY NTNLSHVASA SGLGHRGPKR SSQDKRWVRW SSSTEMGDFI RDAARGREFA IEIEGYNIEM RV SVPSFGD RTYYMRQRLR KMSSEIDGLA KIKHECDLLA HRSAHRLAKG GFGLLAGWWG VVYYVTFHTE FGWDLVEPVT YLA GLTTIM GGYLWFLYIN KDLSYKAAMN VTVSRRQHAL YEMKGFDIER WEQLVQDANA LRREIRVIAV EYDVDWDETR DVGE DVKDV LDEERSRRDD EHRSIEKEKD EKFTEDEKRK RKKDKESKET SGDSTNSHHH HHH UniProtKB: Calcium uniporter protein |
-Macromolecule #2: CALCIUM ION
Macromolecule | Name: CALCIUM ION / type: ligand / ID: 2 / Number of copies: 1 / Formula: CA |
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Molecular weight | Theoretical: 40.078 Da |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 3.2 mg/mL |
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Buffer | pH: 8 |
Grid | Model: Quantifoil, UltrAuFoil, R1.2/1.3 / Material: GOLD / Mesh: 300 / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Time: 7 sec. |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: HOMEMADE PLUNGER / Details: 4 second blot time. |
Details | Final reconstruction comprises ~80% of MCU in nanodisc (crosslinked using BS3) and ~20% MCU in amphipol. |
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Electron microscopy
Microscope | FEI TALOS ARCTICA |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 3710 pixel / Digitization - Dimensions - Height: 3838 pixel / Average electron dose: 65.0 e/Å2 |
Electron beam | Acceleration voltage: 200 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 36000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Refinement | Overall B value: 100 |
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Output model | ![]() PDB-6dt0: |