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Yorodumi- EMDB-0955: Cryo-EM structure of 90S small subunit preribosomes in transition... -
+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-0955 | |||||||||
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Title | Cryo-EM structure of 90S small subunit preribosomes in transition states (State C1) | |||||||||
Map data | ||||||||||
Sample |
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Keywords | ribosome assembly / 90S to pre-40S transition / cryo-EM / Dhr1 / RIBOSOME | |||||||||
Function / homology | Function and homology information rRNA acetylation involved in maturation of SSU-rRNA / rRNA cytidine N-acetyltransferase activity / mRNA modification / Noc4p-Nop14p complex / tRNA acetylation / rRNA small subunit pseudouridine methyltransferase Nep1 / t-UTP complex / RNA fragment catabolic process / rRNA 2'-O-methylation / Pwp2p-containing subcomplex of 90S preribosome ...rRNA acetylation involved in maturation of SSU-rRNA / rRNA cytidine N-acetyltransferase activity / mRNA modification / Noc4p-Nop14p complex / tRNA acetylation / rRNA small subunit pseudouridine methyltransferase Nep1 / t-UTP complex / RNA fragment catabolic process / rRNA 2'-O-methylation / Pwp2p-containing subcomplex of 90S preribosome / histone H2AQ104 methyltransferase activity / nuclear microtubule / Mpp10 complex / snoRNA guided rRNA 2'-O-methylation / rRNA (pseudouridine) methyltransferase activity / regulation of rRNA processing / rRNA modification / endonucleolytic cleavage in 5'-ETS of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / septum digestion after cytokinesis / snRNA binding / SUMOylation of RNA binding proteins / box C/D sno(s)RNA 3'-end processing / positive regulation of RNA binding / regulation of transcription by RNA polymerase I / tRNA export from nucleus / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / rDNA heterochromatin / endonucleolytic cleavage to generate mature 5'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / rRNA methyltransferase activity / positive regulation of rRNA processing / box C/D methylation guide snoRNP complex / U4/U6 snRNP / single-stranded telomeric DNA binding / rRNA base methylation / rRNA primary transcript binding / small nuclear ribonucleoprotein complex / sno(s)RNA-containing ribonucleoprotein complex / U4 snRNA binding / O-methyltransferase activity / protein localization to nucleolus / mTORC1-mediated signalling / Protein hydroxylation / U4 snRNP / rRNA methylation / : / U3 snoRNA binding / poly(A)+ mRNA export from nucleus / positive regulation of nuclear-transcribed mRNA catabolic process, deadenylation-dependent decay / Formation of the ternary complex, and subsequently, the 43S complex / Translation initiation complex formation / Ribosomal scanning and start codon recognition / precatalytic spliceosome / preribosome, small subunit precursor / snoRNA binding / establishment of cell polarity / spliceosomal complex assembly / positive regulation of transcription by RNA polymerase I / Major pathway of rRNA processing in the nucleolus and cytosol / SRP-dependent cotranslational protein targeting to membrane / 90S preribosome / GTP hydrolysis and joining of the 60S ribosomal subunit / 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) / L13a-mediated translational silencing of Ceruloplasmin expression / enzyme activator activity / 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) / regulation of translational fidelity / RNA processing / maturation of SSU-rRNA / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / U4/U6 x U5 tri-snRNP complex / maturation of LSU-rRNA / RNA endonuclease activity / Transferases; Acyltransferases; Transferring groups other than aminoacyl groups / vesicle-mediated transport / Transferases; Transferring one-carbon groups; Methyltransferases / small-subunit processome / nuclear periphery / maintenance of translational fidelity / spliceosomal complex / ribosomal small subunit biogenesis / ribosomal small subunit assembly / mRNA splicing, via spliceosome / rRNA processing / cytosolic small ribosomal subunit / protein transport / small ribosomal subunit / cytoplasmic translation / cytosolic large ribosomal subunit / tRNA binding / rRNA binding / ribosome / structural constituent of ribosome / cell cycle / translation / mRNA binding / GTPase activity / GTP binding / nucleolus Similarity search - Function | |||||||||
Biological species | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast) / Saccharomyces cerevisiae S288C (yeast) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 4.8 Å | |||||||||
Authors | Du Y / Ye K | |||||||||
Funding support | China, 2 items
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Citation | Journal: Science / Year: 2020 Title: Cryo-EM structure of 90 small ribosomal subunit precursors in transition states. Authors: Yifei Du / Weidong An / Xing Zhu / Qi Sun / Jia Qi / Keqiong Ye / Abstract: The 90 preribosome is a large, early assembly intermediate of small ribosomal subunits that undergoes structural changes to give a pre-40 ribosome. Here, we gained insight into this transition by ...The 90 preribosome is a large, early assembly intermediate of small ribosomal subunits that undergoes structural changes to give a pre-40 ribosome. Here, we gained insight into this transition by determining cryo-electron microscopy structures of intermediates in the path from the 90 to the pre-40 The full transition is blocked by deletion of RNA helicase Dhr1. A series of structural snapshots revealed that the excised 5' external transcribed spacer (5' ETS) is degraded within 90, driving stepwise disassembly of assembly factors and ribosome maturation. The nuclear exosome, an RNA degradation machine, docks on the 90 through helicase Mtr4 and is primed to digest the 3' end of the 5' ETS. The structures resolved between 3.2- and 8.6-angstrom resolution reveal key intermediates and the critical role of 5' ETS degradation in 90 progression. | |||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_0955.map.gz | 16.5 MB | EMDB map data format | |
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Header (meta data) | emd-0955-v30.xml emd-0955.xml | 97.2 KB 97.2 KB | Display Display | EMDB header |
Images | emd_0955.png | 68.8 KB | ||
Filedesc metadata | emd-0955.cif.gz | 26.7 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-0955 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-0955 | HTTPS FTP |
-Related structure data
Related structure data | 6lqvMC 0949C 0950C 0951C 0952C 0953C 0954C 6lqpC 6lqqC 6lqrC 6lqsC 6lqtC 6lquC C: citing same article (ref.) M: atomic model generated by this map |
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Similar structure data |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_0955.map.gz / Format: CCP4 / Size: 343 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Voxel size | X=Y=Z: 1.334 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Sample components
+Entire : 90S pre-ribosome (Dhr1-depleted, state C1)
+Supramolecule #1: 90S pre-ribosome (Dhr1-depleted, state C1)
+Macromolecule #1: U3 snoRNA
+Macromolecule #2: 5' ETS
+Macromolecule #3: 18S pre-rRNA
+Macromolecule #4: 40S ribosomal protein S4-A
+Macromolecule #5: 40S ribosomal protein S5
+Macromolecule #6: 40S ribosomal protein S6-A
+Macromolecule #7: 40S ribosomal protein S8-A
+Macromolecule #8: 40S ribosomal protein S9-A
+Macromolecule #9: 40S ribosomal protein S11-A
+Macromolecule #10: 40S ribosomal protein S16-A
+Macromolecule #11: 40S ribosomal protein S23-A
+Macromolecule #12: 40S ribosomal protein S24-A
+Macromolecule #13: 40S ribosomal protein S28-A
+Macromolecule #14: rRNA 2'-O-methyltransferase fibrillarin
+Macromolecule #15: Nucleolar protein 56
+Macromolecule #16: Nucleolar protein 58
+Macromolecule #17: Ribosomal RNA-processing protein 9
+Macromolecule #18: 13 kDa ribonucleoprotein-associated protein
+Macromolecule #19: U3 small nucleolar RNA-associated protein 4
+Macromolecule #20: U3 small nucleolar RNA-associated protein 5
+Macromolecule #21: U3 small nucleolar RNA-associated protein 8
+Macromolecule #22: U3 small nucleolar RNA-associated protein 9
+Macromolecule #23: U3 small nucleolar RNA-associated protein 10
+Macromolecule #24: U3 small nucleolar RNA-associated protein 15
+Macromolecule #25: NET1-associated nuclear protein 1
+Macromolecule #26: Periodic tryptophan protein 2
+Macromolecule #27: U3 small nucleolar RNA-associated protein 12
+Macromolecule #28: U3 small nucleolar RNA-associated protein 13
+Macromolecule #29: U3 small nucleolar RNA-associated protein 18
+Macromolecule #30: U3 small nucleolar RNA-associated protein 21
+Macromolecule #31: U3 small nucleolar RNA-associated protein 6
+Macromolecule #32: Bud site selection protein 21
+Macromolecule #33: U3 small nucleolar RNA-associated protein 7
+Macromolecule #34: U3 small nucleolar RNA-associated protein 11
+Macromolecule #35: U3 small nucleolar RNA-associated protein MPP10
+Macromolecule #36: U3 small nucleolar ribonucleoprotein protein IMP3
+Macromolecule #37: U3 small nucleolar ribonucleoprotein protein IMP4
+Macromolecule #38: Something about silencing protein 10
+Macromolecule #39: Protein SOF1
+Macromolecule #40: rRNA-processing protein FCF2
+Macromolecule #41: rRNA-processing protein FCF1
+Macromolecule #42: Ribosome biogenesis protein ENP2
+Macromolecule #43: U3 small nucleolar ribonucleoprotein protein LCP5
+Macromolecule #44: Ribosomal RNA small subunit methyltransferase NEP1
+Macromolecule #45: Ribosome biogenesis protein BMS1
+Macromolecule #46: RNA 3'-terminal phosphate cyclase-like protein
+Macromolecule #47: RNA cytidine acetyltransferase
+Macromolecule #48: Nucleolar complex protein 14
+Macromolecule #49: Nucleolar complex protein 4
+Macromolecule #50: U3 small nucleolar RNA-associated protein 20
+Macromolecule #51: U3 small nucleolar RNA-associated protein 14
+Macromolecule #52: Essential nuclear protein 1
+Macromolecule #53: Protein BFR2
+Macromolecule #54: Unassigned helices
+Macromolecule #55: ZINC ION
+Macromolecule #56: GUANOSINE-5'-TRIPHOSPHATE
+Macromolecule #57: MAGNESIUM ION
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Concentration | 2.0 mg/mL | |||||||||
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Buffer | pH: 7.4 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Support film - Film thickness: 10 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 45 sec. / Pretreatment - Atmosphere: OTHER | |||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.5 µm |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Frames/image: 1-32 / Number grids imaged: 10 / Number real images: 18028 / Average electron dose: 50.0 e/Å2 |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
-Image processing
Particle selection | Number selected: 382298 |
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Startup model | Type of model: EMDB MAP EMDB ID: |
Initial angle assignment | Type: RANDOM ASSIGNMENT / Software - Name: RELION |
Final 3D classification | Number classes: 8 / Software - Name: RELION |
Final angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: RELION |
Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 4.8 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 9421 |