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- PDB-5zal: Cryo-EM structure of human Dicer and its complexes with a pre-miR... -
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Basic information
Entry | Database: PDB / ID: 5zal | ||||||
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Title | Cryo-EM structure of human Dicer and its complexes with a pre-miRNA substrate | ||||||
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![]() | HYDROLASE/PROTEIN BINDING/RNA / Dicer / TRBP / Cryo-EM / RNA interference / PROTEIN BINDING / HYDROLASE-PROTEIN BINDING-RNA complex | ||||||
Function / homology | ![]() regulation of siRNA processing / regulation of miRNA processing / regulation of viral transcription / negative regulation of cytoplasmic pattern recognition receptor signaling pathway / regulation of regulatory ncRNA processing / peripheral nervous system myelin formation / negative regulation of defense response to virus by host / pre-miRNA binding / tRNA-derived small RNA (tsRNA or tRNA-related fragment, tRF) biogenesis / Small interfering RNA (siRNA) biogenesis ...regulation of siRNA processing / regulation of miRNA processing / regulation of viral transcription / negative regulation of cytoplasmic pattern recognition receptor signaling pathway / regulation of regulatory ncRNA processing / peripheral nervous system myelin formation / negative regulation of defense response to virus by host / pre-miRNA binding / tRNA-derived small RNA (tsRNA or tRNA-related fragment, tRF) biogenesis / Small interfering RNA (siRNA) biogenesis / tRNA decay / global gene silencing by mRNA cleavage / negative regulation of Schwann cell proliferation / ribonuclease III / positive regulation of myelination / apoptotic DNA fragmentation / nerve development / positive regulation of Schwann cell differentiation / RISC-loading complex / miRNA metabolic process / deoxyribonuclease I activity / RISC complex assembly / ribonuclease III activity / miRNA processing / siRNA binding / pre-miRNA processing / M-decay: degradation of maternal mRNAs by maternally stored factors / pre-mRNA binding / siRNA processing / RISC complex / MicroRNA (miRNA) biogenesis / miRNA binding / negative regulation of tumor necrosis factor production / negative regulation of tumor necrosis factor-mediated signaling pathway / positive regulation of viral genome replication / protein sequestering activity / RNA endonuclease activity / helicase activity / neuron projection morphogenesis / negative regulation of protein kinase activity / PKR-mediated signaling / double-stranded RNA binding / regulation of translation / nuclear body / protein domain specific binding / negative regulation of gene expression / perinuclear region of cytoplasm / enzyme binding / negative regulation of transcription by RNA polymerase II / protein homodimerization activity / DNA binding / RNA binding / extracellular exosome / nucleoplasm / ATP binding / identical protein binding / nucleus / metal ion binding / cytoplasm / cytosol Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.7 Å | ||||||
![]() | Liu, Z. / Wang, J. / Cheng, H. / Ke, X. / Sun, L. / Zhang, Q.C. / Wang, H.-W. | ||||||
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![]() | ![]() Title: Cryo-EM Structure of Human Dicer and Its Complexes with a Pre-miRNA Substrate. Authors: Zhongmin Liu / Jia Wang / Hang Cheng / Xin Ke / Lei Sun / Qiangfeng Cliff Zhang / Hong-Wei Wang / ![]() Abstract: Human Dicer (hDicer) is a multi-domain protein belonging to the RNase III family. It plays pivotal roles in small RNA biogenesis during the RNA interference (RNAi) pathway by processing a diverse ...Human Dicer (hDicer) is a multi-domain protein belonging to the RNase III family. It plays pivotal roles in small RNA biogenesis during the RNA interference (RNAi) pathway by processing a diverse range of double-stranded RNA (dsRNA) precursors to generate ∼22 nt microRNA (miRNA) or small interfering RNA (siRNA) products for sequence-directed gene silencing. In this work, we solved the cryoelectron microscopy (cryo-EM) structure of hDicer in complex with its cofactor protein TRBP and revealed the precise spatial arrangement of hDicer's multiple domains. We further solved structures of the hDicer-TRBP complex bound with pre-let-7 RNA in two distinct conformations. In combination with biochemical analysis, these structures reveal a property of the hDicer-TRBP complex to promote the stability of pre-miRNA's stem duplex in a pre-dicing state. These results provide insights into the mechanism of RNA processing by hDicer and illustrate the regulatory role of hDicer's N-terminal helicase domain. | ||||||
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 302.7 KB | Display | ![]() |
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PDB format | ![]() | 234.9 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 742.6 KB | Display | ![]() |
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Full document | ![]() | 783.5 KB | Display | |
Data in XML | ![]() | 47.5 KB | Display | |
Data in CIF | ![]() | 72 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6905MC ![]() 6904C ![]() 6906C ![]() 5zakC ![]() 5zamC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 218947.328 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
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#2: Protein | Mass: 39085.277 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
#3: RNA chain | Mass: 23375.830 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
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Buffer solution | pH: 8 Details: 50 mM Tris-HCl (pH 8.0), 100 mM NaCl, 1 mM DTT, 2 mM CaCl2 | ||||||||||||||||||
Specimen | Conc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: This sample was mono-disperse. | ||||||||||||||||||
Specimen support | Details: The grid was glow-discharged prior to use. / Grid material: GOLD / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3 | ||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 293 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS / Details: no |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 89000 X / Calibrated magnification: 36496 X / Nominal defocus max: 3500 nm / Nominal defocus min: 2500 nm / Calibrated defocus min: 2500 nm / Calibrated defocus max: 3500 nm / Cs: 0.01 mm / C2 aperture diameter: 70 µm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 80 K / Temperature (min): 80 K |
Image recording | Average exposure time: 5.44 sec. / Electron dose: 50 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 2849 / Details: no |
EM imaging optics | Phase plate: OTHER |
Image scans | Width: 3838 / Height: 3710 / Movie frames/image: 32 / Used frames/image: 1-32 |
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Processing
Software | Name: PHENIX / Version: 1.12_2829: / Classification: refinement | ||||||||||||||||||||||||||||||||
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EM software |
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Image processing | Details: no | ||||||||||||||||||||||||||||||||
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 4.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 130000 / Algorithm: BACK PROJECTION / Num. of class averages: 1 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||
Atomic model building | B value: 100 / Protocol: FLEXIBLE FIT / Space: REAL / Target criteria: CC | ||||||||||||||||||||||||||||||||
Atomic model building | PDB-ID: 5ZAK Pdb chain-ID: A / Pdb chain residue range: 1-1922 | ||||||||||||||||||||||||||||||||
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