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- PDB-6lqp: Cryo-EM structure of 90S small subunit preribosomes in transition... -
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Open data
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Basic information
Entry | Database: PDB / ID: 6lqp | ||||||||||||||||||
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Title | Cryo-EM structure of 90S small subunit preribosomes in transition states (State A) | ||||||||||||||||||
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![]() | RIBOSOME / ribosome assembly / 90S to pre-40S transition / cryo-EM / Dhr1 | ||||||||||||||||||
Function / homology | ![]() rRNA acetylation involved in maturation of SSU-rRNA / 18S rRNA cytidine N-acetyltransferase activity / tRNA N4-acetyltransferase activity / regulation of ribosomal protein gene transcription by RNA polymerase II / rRNA small subunit pseudouridine methyltransferase Nep1 / tRNA acetylation / Noc4p-Nop14p complex / RNA fragment catabolic process / rRNA 2'-O-methylation / CURI complex ...rRNA acetylation involved in maturation of SSU-rRNA / 18S rRNA cytidine N-acetyltransferase activity / tRNA N4-acetyltransferase activity / regulation of ribosomal protein gene transcription by RNA polymerase II / rRNA small subunit pseudouridine methyltransferase Nep1 / tRNA acetylation / Noc4p-Nop14p complex / RNA fragment catabolic process / rRNA 2'-O-methylation / CURI complex / UTP-C complex / t-UTP complex / nuclear microtubule / Mpp10 complex / snoRNA guided rRNA 2'-O-methylation / Pwp2p-containing subcomplex of 90S preribosome / rRNA modification / rRNA (pseudouridine) methyltransferase activity / regulation of rRNA processing / septum digestion after cytokinesis / endonucleolytic cleavage in 5'-ETS of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / snRNA binding / tRNA re-export from nucleus / box C/D sno(s)RNA 3'-end processing / regulation of transcription by RNA polymerase I / rDNA heterochromatin / rRNA methyltransferase activity / endonucleolytic cleavage to generate mature 5'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / box C/D methylation guide snoRNP complex / positive regulation of rRNA processing / single-stranded telomeric DNA binding / U4/U6 snRNP / tRNA export from nucleus / rRNA primary transcript binding / rRNA base methylation / Negative regulators of DDX58/IFIH1 signaling / sno(s)RNA-containing ribonucleoprotein complex / SUMOylation of RNA binding proteins / protein localization to nucleolus / U4 snRNA binding / O-methyltransferase activity / small nuclear ribonucleoprotein complex / rRNA methylation / histone H2A Q104 methyltransferase activity / mTORC1-mediated signalling / Protein hydroxylation / mRNA modification / U4 snRNP / U3 snoRNA binding / positive regulation of nuclear-transcribed mRNA catabolic process, deadenylation-dependent decay / Formation of the ternary complex, and subsequently, the 43S complex / poly(A)+ mRNA export from nucleus / Translation initiation complex formation / preribosome, small subunit precursor / Ribosomal scanning and start codon recognition / snoRNA binding / precatalytic spliceosome / establishment of cell polarity / Major pathway of rRNA processing in the nucleolus and cytosol / positive regulation of transcription by RNA polymerase I / spliceosomal complex assembly / nucleolar large rRNA transcription by RNA polymerase I / SRP-dependent cotranslational protein targeting to membrane / GTP hydrolysis and joining of the 60S ribosomal subunit / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / Formation of a pool of free 40S subunits / L13a-mediated translational silencing of Ceruloplasmin expression / 90S preribosome / Ub-specific processing proteases / 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 / ribosomal subunit export from nucleus / U4/U6 x U5 tri-snRNP complex / vesicle-mediated transport / Transferases; Acyltransferases; Transferring groups other than aminoacyl groups / RNA endonuclease activity / enzyme activator activity / nuclear periphery / Transferases; Transferring one-carbon groups; Methyltransferases / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / maturation of SSU-rRNA / small-subunit processome / translational initiation / spliceosomal complex / maintenance of translational fidelity / mRNA splicing, via spliceosome / rRNA processing / protein transport / peroxisome / ribosome biogenesis / ribosomal small subunit assembly / ribosomal small subunit biogenesis / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / cytoplasmic translation / tRNA binding Similarity search - Function | ||||||||||||||||||
Biological species | ![]() ![]() ![]() ![]() | ||||||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å | ||||||||||||||||||
![]() | Du, Y. / Ye, K. | ||||||||||||||||||
Funding support | ![]()
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![]() | ![]() 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 |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 5.3 MB | Display | ![]() |
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PDB format | ![]() | Display | ![]() | |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.6 MB | Display | ![]() |
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Full document | ![]() | 1.7 MB | Display | |
Data in XML | ![]() | 563.8 KB | Display | |
Data in CIF | ![]() | 964.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 0949MC ![]() 0950C ![]() 0951C ![]() 0952C ![]() 0953C ![]() 0954C ![]() 0955C ![]() 6lqqC ![]() 6lqrC ![]() 6lqsC ![]() 6lqtC ![]() 6lquC ![]() 6lqvC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
+RNA chain , 3 types, 3 molecules 3A5ASA
+40S ribosomal protein ... , 18 types, 18 molecules SCSFSGSHSISJSKSMSNSOSPSRSTSXSYSZScSd
+Protein , 17 types, 21 molecules 3B3C3G3HAGB15B5H5IRCRGRHRKRLRMRSRTRVRWRYX1
+Nucleolar protein ... , 2 types, 2 molecules 3D3E
+Ribosomal RNA-processing protein ... , 2 types, 2 molecules 3FRF
+U3 small nucleolar RNA-associated protein ... , 17 types, 17 molecules A4A5A8A9AEAFB2B3B8BEB65C5D5ERERPRQ
+U3 small nucleolar ribonucleoprotein protein ... , 3 types, 3 molecules 5F5GRB
+RRNA-processing protein ... , 2 types, 2 molecules 5J5K
+Ribosome biogenesis protein ... , 3 types, 3 molecules RARIRJ
+Nucleolar complex protein ... , 2 types, 2 molecules RNRO
+Non-polymers , 3 types, 4 molecules 




+Details
-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
Component | Name: 90S pre-ribosome (Dhr1-depleted, state A) / Type: COMPLEX / Entity ID: #1-#69 / Source: NATURAL | |||||||||||||||
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Molecular weight | Value: 5 MDa / Experimental value: NO | |||||||||||||||
Source (natural) | Organism: ![]() ![]() | |||||||||||||||
Buffer solution | pH: 7.4 | |||||||||||||||
Buffer component |
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Specimen | Conc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | |||||||||||||||
Specimen support | Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3 | |||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 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 |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 1500 nm / Cs: 2.7 mm |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 50 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 10 / Num. of real images: 18028 |
Image scans | Movie frames/image: 32 / Used frames/image: 1-32 |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 382298 | ||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 71230 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||
Atomic model building | PDB-ID: 6KE6 Accession code: 6KE6 / Source name: PDB / Type: experimental model |