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- EMDB-2981: Cryo-EM reveals the conformation of a substrate analogue in the h... -
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Basic information
Entry | Database: EMDB / ID: EMD-2981 | |||||||||
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Title | Cryo-EM reveals the conformation of a substrate analogue in the human 20S proteasome core | |||||||||
![]() | reconstruction of the human 20S proteasome core, as determined by the 3D reconstitution algorithm, without further masking, sharpening or Fourier filtering | |||||||||
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![]() | proteasome / 20S / human / AdaAhx3L3VS / ligand / inhibitor / drug design | |||||||||
Function / homology | ![]() purine ribonucleoside triphosphate binding / regulation of endopeptidase activity / Regulation of ornithine decarboxylase (ODC) / Proteasome assembly / Cross-presentation of soluble exogenous antigens (endosomes) / proteasome core complex / Somitogenesis / myofibril / immune system process / NF-kappaB binding ...purine ribonucleoside triphosphate binding / regulation of endopeptidase activity / Regulation of ornithine decarboxylase (ODC) / Proteasome assembly / Cross-presentation of soluble exogenous antigens (endosomes) / proteasome core complex / Somitogenesis / myofibril / immune system process / NF-kappaB binding / proteasome endopeptidase complex / proteasome core complex, beta-subunit complex / threonine-type endopeptidase activity / proteasome core complex, alpha-subunit complex / proteasome complex / sarcomere / proteolysis involved in protein catabolic process / ciliary basal body / Regulation of activated PAK-2p34 by proteasome mediated degradation / Autodegradation of Cdh1 by Cdh1:APC/C / APC/C:Cdc20 mediated degradation of Securin / Asymmetric localization of PCP proteins / Ubiquitin-dependent degradation of Cyclin D / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / TNFR2 non-canonical NF-kB pathway / AUF1 (hnRNP D0) binds and destabilizes mRNA / Vpu mediated degradation of CD4 / Assembly of the pre-replicative complex / Ubiquitin Mediated Degradation of Phosphorylated Cdc25A / Degradation of DVL / Cdc20:Phospho-APC/C mediated degradation of Cyclin A / Dectin-1 mediated noncanonical NF-kB signaling / Degradation of AXIN / Hh mutants are degraded by ERAD / lipopolysaccharide binding / Activation of NF-kappaB in B cells / negative regulation of inflammatory response to antigenic stimulus / Degradation of GLI1 by the proteasome / G2/M Checkpoints / P-body / Hedgehog ligand biogenesis / Defective CFTR causes cystic fibrosis / Autodegradation of the E3 ubiquitin ligase COP1 / Negative regulation of NOTCH4 signaling / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Vif-mediated degradation of APOBEC3G / Regulation of RUNX3 expression and activity / Hedgehog 'on' state / Degradation of GLI2 by the proteasome / GLI3 is processed to GLI3R by the proteasome / FBXL7 down-regulates AURKA during mitotic entry and in early mitosis / MAPK6/MAPK4 signaling / APC/C:Cdh1 mediated degradation of Cdc20 and other APC/C:Cdh1 targeted proteins in late mitosis/early G1 / Degradation of beta-catenin by the destruction complex / Oxygen-dependent proline hydroxylation of Hypoxia-inducible Factor Alpha / : / response to virus / ABC-family proteins mediated transport / CDK-mediated phosphorylation and removal of Cdc6 / CLEC7A (Dectin-1) signaling / SCF(Skp2)-mediated degradation of p27/p21 / Regulation of expression of SLITs and ROBOs / FCERI mediated NF-kB activation / nuclear matrix / Regulation of PTEN stability and activity / Interleukin-1 signaling / Orc1 removal from chromatin / Regulation of RAS by GAPs / Regulation of RUNX2 expression and activity / Separation of Sister Chromatids / The role of GTSE1 in G2/M progression after G2 checkpoint / UCH proteinases / KEAP1-NFE2L2 pathway / Antigen processing: Ubiquitination & Proteasome degradation / Downstream TCR signaling / peptidase activity / positive regulation of NF-kappaB transcription factor activity / RUNX1 regulates transcription of genes involved in differentiation of HSCs / Neddylation / ER-Phagosome pathway / regulation of inflammatory response / secretory granule lumen / endopeptidase activity / proteasome-mediated ubiquitin-dependent protein catabolic process / response to oxidative stress / ficolin-1-rich granule lumen / nuclear body / Ub-specific processing proteases / ribosome / cadherin binding / intracellular membrane-bounded organelle / centrosome / ubiquitin protein ligase binding / synapse / Neutrophil degranulation / mitochondrion / proteolysis / RNA binding / extracellular exosome Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.5 Å | |||||||||
![]() | da Fonseca PCA / Morris EP | |||||||||
![]() | ![]() Title: Cryo-EM reveals the conformation of a substrate analogue in the human 20S proteasome core. Authors: Paula C A da Fonseca / Edward P Morris / ![]() Abstract: The proteasome is a highly regulated protease complex fundamental for cell homeostasis and controlled cell cycle progression. It functions by removing a wide range of specifically tagged proteins, ...The proteasome is a highly regulated protease complex fundamental for cell homeostasis and controlled cell cycle progression. It functions by removing a wide range of specifically tagged proteins, including key cellular regulators. Here we present the structure of the human 20S proteasome core bound to a substrate analogue inhibitor molecule, determined by electron cryo-microscopy (cryo-EM) and single-particle analysis at a resolution of around 3.5 Å. Our map allows the building of protein coordinates as well as defining the location and conformation of the inhibitor at the different active sites. These results open new prospects to tackle the proteasome functional mechanisms. Moreover, they also further demonstrate that cryo-EM is emerging as a realistic approach for general structural studies of protein-ligand interactions. | |||||||||
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 | ![]() | 58.3 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 24.6 KB 24.6 KB | Display Display | ![]() |
Images | ![]() | 152.2 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 314.1 KB | Display | ![]() |
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Full document | ![]() | 313.2 KB | Display | |
Data in XML | ![]() | 6.3 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 5a0qMC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data size: 579.1 Data #1: raw micrographs of the human 20S proteasome core complex bound to the ligand AdaAhx3L3VS [micrographs - multiframe]) |
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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 | reconstruction of the human 20S proteasome core, as determined by the 3D reconstitution algorithm, without further masking, sharpening or Fourier filtering | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.04 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 : human 20S proteasome core
+Supramolecule #1000: human 20S proteasome core
+Macromolecule #1: Proteasome subunit alpha type-6
+Macromolecule #2: Proteasome subunit alpha type-2
+Macromolecule #3: Proteasome subunit alpha type-4
+Macromolecule #4: Proteasome subunit alpha type-7
+Macromolecule #5: Proteasome subunit alpha type-5
+Macromolecule #6: Proteasome subunit alpha type-1
+Macromolecule #7: Proteasome subunit alpha type-3
+Macromolecule #8: Proteasome subunit beta type-6
+Macromolecule #9: Proteasome subunit beta type-7
+Macromolecule #10: Proteasome subunit beta type-3
+Macromolecule #11: Proteasome subunit beta type-2
+Macromolecule #12: Proteasome subunit beta type-5
+Macromolecule #13: Proteasome subunit beta type-1
+Macromolecule #14: Proteasome subunit beta type-4
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.1 mg/mL |
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Buffer | pH: 7.5 / Details: 50 mM Tris-HCl, 5 mM MgCl2 and 1mM dithiotreitol |
Grid | Details: 1.2/1.3 Quantifoil coated with freshly floated thin layer of carbon, glow discharged in amylamine atmosphere |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 120 K / Instrument: FEI VITROBOT MARK III / Method: blot 2.5 seconds before plunging |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Temperature | Average: 85 K |
Alignment procedure | Legacy - Astigmatism: objective lens astigmatism was corrected at the recording magnification |
Details | Each exposure was recorded as 17 individual frames captured at a rate of 0.056 second/frame, with an electron dose of 2.8 electrons/square angstrom. Data-set recorded using EPU software. |
Date | Feb 4, 2014 |
Image recording | Category: CCD / Film or detector model: FEI FALCON II (4k x 4k) / Digitization - Sampling interval: 14 µm / Number real images: 960 / Average electron dose: 48 e/Å2 Details: each image is the sum of 17 frames recorded by the direct electron detector |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Calibrated magnification: 134461 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.7 µm / Nominal magnification: 75000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Details | automatic particle picking followed by careful manual removal of false positives and addition of false negatives; high resolution analysis was done using the sum of frames 3-10 |
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CTF correction | Details: full recorded image |
Final reconstruction | Applied symmetry - Point group: C2 (2 fold cyclic) / Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 3.5 Å / Resolution method: OTHER / Software - Name: Spider, Tigris, Imagic Details: the analysis was done using a data-set recorded during a single EM session Number images used: 76500 |
Final angle assignment | Details: Beta 0 degrees, gamma 90 degrees (IMAGIC) |
-Atomic model buiding 1
Initial model | PDB ID: Chain - #0 - Chain ID: A / Chain - #1 - Chain ID: B / Chain - #2 - Chain ID: C / Chain - #3 - Chain ID: D / Chain - #4 - Chain ID: E / Chain - #5 - Chain ID: F / Chain - #6 - Chain ID: G / Chain - #7 - Chain ID: H / Chain - #8 - Chain ID: I / Chain - #9 - Chain ID: J / Chain - #10 - Chain ID: K / Chain - #11 - Chain ID: L / Chain - #12 - Chain ID: M / Chain - #13 - Chain ID: N / Chain - #14 - Chain ID: O / Chain - #15 - Chain ID: P / Chain - #16 - Chain ID: Q / Chain - #17 - Chain ID: R / Chain - #18 - Chain ID: S / Chain - #19 - Chain ID: T / Chain - #20 - Chain ID: U / Chain - #21 - Chain ID: V / Chain - #22 - Chain ID: W / Chain - #23 - Chain ID: X / Chain - #24 - Chain ID: Y / Chain - #25 - Chain ID: Z / Chain - #26 - Chain ID: a / Chain - #27 - Chain ID: b |
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Software | Name: Coot, Phenix |
Details | The model of the human 20S proteasome core was built based on the X-ray crystal structure of the mouse constitutive apo 20S proteasome core (3UNE) using real space refinement in Coot and Phenix |
Refinement | Space: REAL / Protocol: FLEXIBLE FIT |
Output model | ![]() PDB-5a0q: |