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Yorodumi- EMDB-51911: Late-stage 48S Initiation Complex with eIF3 (LS48S-eIF3 IC) guide... -
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Open data
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Basic information
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| Title | Late-stage 48S Initiation Complex with eIF3 (LS48S-eIF3 IC) guided by the trans-RNA | ||||||||||||
Map data | Main map of the mammalian late-stage 48S initiation complex with eIF3 (LS48S-eIF3 IC) | ||||||||||||
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Keywords | 48S late-stage initiation complex / Programmable mRNA translation initiation / trans-RNA / activation of mRNA translation / TRANSLATION | ||||||||||||
| Function / homology | Function and homology informationregulation of macromolecule metabolic process / Translation initiation complex formation / Formation of the ternary complex, and subsequently, the 43S complex / Ribosomal scanning and start codon recognition / eukaryotic initiation factor eIF2 binding / Major pathway of rRNA processing in the nucleolus and cytosol / GTP hydrolysis and joining of the 60S ribosomal subunit / viral translational termination-reinitiation / L13a-mediated translational silencing of Ceruloplasmin expression / SRP-dependent cotranslational protein targeting to membrane ...regulation of macromolecule metabolic process / Translation initiation complex formation / Formation of the ternary complex, and subsequently, the 43S complex / Ribosomal scanning and start codon recognition / eukaryotic initiation factor eIF2 binding / Major pathway of rRNA processing in the nucleolus and cytosol / GTP hydrolysis and joining of the 60S ribosomal subunit / viral translational termination-reinitiation / L13a-mediated translational silencing of Ceruloplasmin expression / SRP-dependent cotranslational protein targeting to membrane / Formation of a pool of free 40S subunits / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / eukaryotic translation initiation factor 3 complex, eIF3e / cap-dependent translational initiation / eukaryotic translation initiation factor 3 complex, eIF3m / IRES-dependent viral translational initiation / translation reinitiation / eukaryotic translation initiation factor 2 complex / formation of cytoplasmic translation initiation complex / eukaryotic translation initiation factor 3 complex / multi-eIF complex / translation factor activity, RNA binding / eukaryotic 43S preinitiation complex / formation of translation preinitiation complex / mRNA cap binding / eukaryotic 48S preinitiation complex / cellular response to chemical stress / protein-synthesizing GTPase / metal-dependent deubiquitinase activity / nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / regulation of translational initiation / GDP-dissociation inhibitor activity / Formation of the ternary complex, and subsequently, the 43S complex / laminin receptor activity / Ribosomal scanning and start codon recognition / Translation initiation complex formation / Formation of a pool of free 40S subunits / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / ubiquitin ligase inhibitor activity / positive regulation of signal transduction by p53 class mediator / GTP hydrolysis and joining of the 60S ribosomal subunit / 90S preribosome / L13a-mediated translational silencing of Ceruloplasmin expression / phagocytic cup / laminin binding / endonucleolytic cleavage in ITS1 to separate SSU-rRNA from 5.8S rRNA and LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / rough endoplasmic reticulum / translation regulator activity / ribosomal small subunit export from nucleus / gastrulation / translation initiation factor binding / MDM2/MDM4 family protein binding / translation initiation factor activity / cytosolic ribosome / class I DNA-(apurinic or apyrimidinic site) endonuclease activity / DNA-(apurinic or apyrimidinic site) lyase / GTPase activator activity / response to endoplasmic reticulum stress / positive regulation of translation / ribosome assembly / positive regulation of apoptotic signaling pathway / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / maturation of SSU-rRNA / small-subunit processome / translational initiation / PML body / spindle / fibrillar center / cytoplasmic stress granule / rRNA processing / rhythmic process / positive regulation of canonical Wnt signaling pathway / regulation of translation / ribosome binding / virus receptor activity / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / perikaryon / cytoplasmic translation / cysteine-type deubiquitinase activity / cell differentiation / tRNA binding / mitochondrial inner membrane / rRNA binding / postsynaptic density / structural constituent of ribosome / ribosome / translation / ribonucleoprotein complex / cell division / DNA repair / mRNA binding / GTPase activity / apoptotic process / synapse / dendrite Similarity search - Function | ||||||||||||
| Biological species | ![]() | ||||||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 2.9 Å | ||||||||||||
Authors | Nguyen TT / Hashem Y / Rocha REO / Boissier F / Qian SB / Jia L / Uematsu S / Gu Y / Shi S | ||||||||||||
| Funding support | United States, European Union, 3 items
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Citation | Journal: Nat Biotechnol / Year: 2025Title: Programmable initiation of mRNA translation by trans-RNA. Authors: Longfei Jia / Tan-Trung Nguyen / Saori Uematsu / Yifei Gu / Shengcho Shi / Yaser Hashem / Shu-Bing Qian / ![]() Abstract: Several approaches exist to silence genes, but few tools are available to activate individual mRNAs for translation inside cells. Guiding ribosomes to specific start codons without altering the ...Several approaches exist to silence genes, but few tools are available to activate individual mRNAs for translation inside cells. Guiding ribosomes to specific start codons without altering the original sequence remains a formidable task. Here we design capped trans-RNAs capable of directing ribosomes to specific initiation sites on individual mRNAs when the trans-cap is positioned near the target start codon. Structural and biochemical data suggest that the capped trans-RNA facilitates ribosome loading and scanning on the target mRNA through a synergistic mechanism involving alternative cap recognition. The trans-RNA also acts independently of the cap on the target mRNA, enabling translation of circular RNAs lacking internal ribosome entry sites. We apply trans-RNAs in vivo to achieve programmable alternative translation of endogenous genes in mouse liver. Finally, we provide the evidence for the existence of natural transcripts that, similarly to exogenous trans-RNAs, activate translation of endogenous mRNAs. | ||||||||||||
| History |
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_51911.map.gz | 450.6 MB | EMDB map data format | |
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| Header (meta data) | emd-51911-v30.xml emd-51911.xml | 84.7 KB 84.7 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_51911_fsc.xml | 16.5 KB | Display | FSC data file |
| Images | emd_51911.png | 63.1 KB | ||
| Filedesc metadata | emd-51911.cif.gz | 19.3 KB | ||
| Others | emd_51911_additional_1.map.gz emd_51911_half_map_1.map.gz emd_51911_half_map_2.map.gz | 398.6 MB 443.1 MB 443.1 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-51911 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-51911 | HTTPS FTP |
-Validation report
| Summary document | emd_51911_validation.pdf.gz | 1.2 MB | Display | EMDB validaton report |
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| Full document | emd_51911_full_validation.pdf.gz | 1.2 MB | Display | |
| Data in XML | emd_51911_validation.xml.gz | 25.8 KB | Display | |
| Data in CIF | emd_51911_validation.cif.gz | 34 KB | Display | |
| Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-51911 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-51911 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9h74MC ![]() 9h6yC M: atomic model generated by this map C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_51911.map.gz / Format: CCP4 / Size: 476.8 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Annotation | Main map of the mammalian late-stage 48S initiation complex with eIF3 (LS48S-eIF3 IC) | ||||||||||||||||||||||||||||||||||||
| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 0.93 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Additional map: EMhanced map of the mammalian late-stage 48S initiation...
| File | emd_51911_additional_1.map | ||||||||||||
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| Annotation | EMhanced map of the mammalian late-stage 48S initiation complex with eIF3 (LS48S-eIF3 IC) | ||||||||||||
| Projections & Slices |
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| Density Histograms |
-Half map: Half map A of the mammalian late-stage 48S...
| File | emd_51911_half_map_1.map | ||||||||||||
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| Annotation | Half map A of the mammalian late-stage 48S initiation complex with eIF3 (LS48S-eIF3 IC) | ||||||||||||
| Projections & Slices |
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| Density Histograms |
-Half map: Half map B of the mammalian late-stage 48S...
| File | emd_51911_half_map_2.map | ||||||||||||
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| Annotation | Half map B of the mammalian late-stage 48S initiation complex with eIF3 (LS48S-eIF3 IC) | ||||||||||||
| Projections & Slices |
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| Density Histograms |
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Sample components
+Entire : Late-stage 48S Initiation Complex with eIF3 (LS48S-eIF3 IC) guide...
+Supramolecule #1: Late-stage 48S Initiation Complex with eIF3 (LS48S-eIF3 IC) guide...
+Macromolecule #1: Initiator methionylated tRNA
+Macromolecule #2: 18S ribosomal RNA
+Macromolecule #3: Linear mRNA
+Macromolecule #4: Eukaryotic translation initiation factor 2 subunit 1
+Macromolecule #5: protein-synthesizing GTPase
+Macromolecule #6: 40S ribosomal protein SA
+Macromolecule #7: 40S ribosomal protein S3a
+Macromolecule #8: Small ribosomal subunit protein uS5
+Macromolecule #9: Ribosomal protein S3
+Macromolecule #10: 40S ribosomal protein S4
+Macromolecule #11: Ribosomal protein S5
+Macromolecule #12: Small ribosomal subunit protein eS6
+Macromolecule #13: 40S ribosomal protein S7
+Macromolecule #14: Small ribosomal subunit protein eS8
+Macromolecule #15: 40S ribosomal protein S9
+Macromolecule #16: Small ribosomal subunit protein eS10
+Macromolecule #17: 40S ribosomal protein S11
+Macromolecule #18: 40S ribosomal protein S12
+Macromolecule #19: 40S ribosomal protein S13
+Macromolecule #20: 40S ribosomal protein uS11
+Macromolecule #21: 40S ribosomal protein uS19
+Macromolecule #22: Ribosomal protein S16
+Macromolecule #23: 40S ribosomal protein eS17
+Macromolecule #24: 40S ribosomal protein uS13
+Macromolecule #25: 40S ribosomal protein eS19
+Macromolecule #26: 40S ribosomal protein uS10
+Macromolecule #27: 40S ribosomal protein S21
+Macromolecule #28: Ribosomal protein S15a
+Macromolecule #29: 40S ribosomal protein S23
+Macromolecule #30: 40S ribosomal protein S24
+Macromolecule #31: 40S ribosomal protein S26
+Macromolecule #32: 40S ribosomal protein S27
+Macromolecule #33: 40S ribosomal protein S28
+Macromolecule #34: 40S ribosomal protein S29
+Macromolecule #35: Ribosomal protein S27a
+Macromolecule #36: Small ribosomal subunit protein RACK1
+Macromolecule #37: 40S ribosomal protein S30
+Macromolecule #38: Eukaryotic translation initiation factor 1A, X-chromosomal
+Macromolecule #39: ATP binding cassette subfamily E member 1
+Macromolecule #40: 60S ribosomal protein L41
+Macromolecule #41: Eukaryotic translation initiation factor 3 subunit D
+Macromolecule #42: 40S ribosomal protein S25
+Macromolecule #43: Eukaryotic translation initiation factor 5
+Macromolecule #44: Eukaryotic translation initiation factor 3 subunit F
+Macromolecule #45: Eukaryotic translation initiation factor 3 subunit H
+Macromolecule #46: Eukaryotic translation initiation factor 3 subunit K
+Macromolecule #47: Eukaryotic translation initiation factor 3 subunit L
+Macromolecule #48: Eukaryotic translation initiation factor 3 subunit M
+Macromolecule #49: Eukaryotic translation initiation factor 3 subunit C
+Macromolecule #50: Eukaryotic translation initiation factor 3 subunit E
+Macromolecule #51: Eukaryotic translation initiation factor 3 subunit A
+Macromolecule #52: IRON/SULFUR CLUSTER
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Concentration | 0.4 mg/mL | ||||||||||||||||||
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| Buffer | pH: 7.4 Component:
Details: 10 mM HEPES-KOH pH 7.4, 5 mM Mg(OAc)2, 50 mM KOAc, 10 mM NH4Cl, 2 mM DTT and Roche cOmplete protease inhibitor cocktail | ||||||||||||||||||
| Grid | Model: Quantifoil R2/2 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Support film - Film thickness: 2 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 20 sec. / Details: glow-discharged at 2.5 mA for 20 s | ||||||||||||||||||
| Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV Details: The sample was incubated on the grid for 30 s and then blotted with filter paper from both sides for 1.5 s with the blot force 5. | ||||||||||||||||||
| Details | late-stage 48S initiation translation complex with eIF3 (LS48S-eIF3 IC) was dissolved in 20 microlitre buffer containing 10 mM HEPES-KOH pH 7.4, 5 mM Mg(OAc)2, 50 mM KOAc, 10 mM NH4Cl, 2 mM DTT and Roche cOmplete protease inhibitor cocktail |
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Electron microscopy
| Microscope | FEI TALOS ARCTICA |
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| Temperature | Min: 90.0 K / Max: 95.0 K |
| Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Digitization - Frames/image: 1-40 / Number grids imaged: 1 / Number real images: 9524 / Average exposure time: 6.0 sec. / Average electron dose: 50.0 e/Å2 |
| Electron beam | Acceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | C2 aperture diameter: 30.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 59000 |
| 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
| Initial model |
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| Details | The atomic model of LS48S IC complex (PDB: 8P09) was initially rigid body fitted in density using ChimeraX and further model building was done for mRNA, eIF5 N-terminal domain, eIF2gamma, eIF3d and eIF3 octamer in ChimeraX. Densities for eIF5 N-terminal domain, eIF2gamma, eIF3d and eIF3 octamer were observed in the map and therefore were included in the model. The 3D structure of the eIF5-N terminal domain was generated by Alphafold2 (PDB: G1TGW1). It was then accommodated into the model by aligning structurally to its counterparts in the yeast atomic model of the py48S-eIF5N pre-initiation complex (PDB: 6FYX). IF3d and eIF3 octamer were taken from the atomic model of LS48S IC complex with eIF3 proteins (PDB: 6YAM) and placed into density by rigid-body fitting. The atomic models with and without eIF3 proteins were inspected visually and performed stereochemical, torsional, angle refinement and optimization by using ISOLDE v1.6. Figures featuring cryo-EM densities and atomic models were visualized by using ChimeraX. | |||||||||||||||
| Refinement | Protocol: RIGID BODY FIT | |||||||||||||||
| Output model | ![]() PDB-9h74: |
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Keywords
Authors
United States, European Union, 3 items
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FIELD EMISSION GUN





