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- PDB-6lqv: 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: 6lqv | |||||||||
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Title | Cryo-EM structure of 90S small subunit preribosomes in transition states (State C1) | |||||||||
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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 / rRNA cytidine N-acetyltransferase activity / tRNA N-acetyltransferase activity / tRNA acetylation / rRNA small subunit pseudouridine methyltransferase Nep1 / Noc4p-Nop14p complex / RNA fragment catabolic process / rRNA 2'-O-methylation / nuclear microtubule / t-UTP complex ...rRNA acetylation involved in maturation of SSU-rRNA / rRNA cytidine N-acetyltransferase activity / tRNA N-acetyltransferase activity / tRNA acetylation / rRNA small subunit pseudouridine methyltransferase Nep1 / Noc4p-Nop14p complex / RNA fragment catabolic process / rRNA 2'-O-methylation / nuclear microtubule / t-UTP complex / Mpp10 complex / snoRNA guided rRNA 2'-O-methylation / Pwp2p-containing subcomplex of 90S preribosome / rRNA (pseudouridine) methyltransferase activity / rRNA modification / regulation of rRNA processing / histone H2AQ104 methyltransferase activity / snRNA binding / mRNA modification / tRNA re-export from nucleus / endonucleolytic cleavage in 5'-ETS of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / septum digestion after cytokinesis / regulation of transcription by RNA polymerase I / box C/D sno(s)RNA 3'-end processing / rDNA heterochromatin / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / rRNA methyltransferase activity / endonucleolytic cleavage to generate mature 5'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / positive regulation of rRNA processing / single-stranded telomeric DNA binding / U4/U6 snRNP / tRNA export from nucleus / rRNA base methylation / rRNA primary transcript binding / SUMOylation of RNA binding proteins / O-methyltransferase activity / protein localization to nucleolus / small nuclear ribonucleoprotein complex / U4 snRNA binding / sno(s)RNA-containing ribonucleoprotein complex / box C/D methylation guide snoRNP complex / mTORC1-mediated signalling / Protein hydroxylation / rRNA methylation / 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 / Translation initiation complex formation / Ribosomal scanning and start codon recognition / poly(A)+ mRNA export from nucleus / preribosome, small subunit precursor / establishment of cell polarity / snoRNA binding / precatalytic spliceosome / positive regulation of transcription by RNA polymerase I / Major pathway of rRNA processing in the nucleolus and cytosol / spliceosomal complex assembly / SRP-dependent cotranslational protein targeting to membrane / 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 / 90S preribosome / regulation of translational fidelity / ribosomal subunit export from nucleus / RNA processing / 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) / vesicle-mediated transport / U4/U6 x U5 tri-snRNP complex / enzyme activator activity / Transferases; Acyltransferases; Transferring groups other than aminoacyl groups / RNA endonuclease activity / Transferases; Transferring one-carbon groups; Methyltransferases / nuclear periphery / 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 / ribosomal small subunit biogenesis / ribosomal small subunit assembly / cytosolic small ribosomal subunit / cytoplasmic translation / tRNA binding / rRNA binding / ribosome / structural constituent of ribosome / translation / GTPase activity / mRNA binding / nucleolus / GTP binding / ATP hydrolysis activity Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.8 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 | ![]() | 4.2 MB | Display | ![]() |
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PDB format | ![]() | Display | ![]() | |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 0955MC ![]() 0949C ![]() 0950C ![]() 0951C ![]() 0952C ![]() 0953C ![]() 0954C ![]() 6lqpC ![]() 6lqqC ![]() 6lqrC ![]() 6lqsC ![]() 6lqtC ![]() 6lquC 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 ... , 10 types, 10 molecules SFSGSHSJSKSMSRSYSZSd
+Protein , 14 types, 18 molecules 3B3C3F3G3HAGB15B5H5IRGRHRKRLRMRSRYX1
+Nucleolar protein ... , 2 types, 2 molecules 3D3E
+U3 small nucleolar RNA-associated protein ... , 16 types, 16 molecules A4A5A8A9AEAFB2B3B8BEB65C5D5ERPRQ
+U3 small nucleolar ribonucleoprotein protein ... , 3 types, 3 molecules 5F5GRB
+RRNA-processing protein ... , 2 types, 2 molecules 5J5K
+Ribosome biogenesis protein ... , 2 types, 2 molecules RARJ
+Nucleolar complex protein ... , 2 types, 2 molecules RNRO
+Non-polymers , 3 types, 3 molecules ![](data/chem/img/ZN.gif)
![](data/chem/img/GTP.gif)
![](data/chem/img/MG.gif)
![](data/chem/img/GTP.gif)
![](data/chem/img/MG.gif)
+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 C1) / Type: COMPLEX / Entity ID: #1-#54 / Source: NATURAL | |||||||||||||||
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Molecular weight | Value: 5 MDa / Experimental value: NO | |||||||||||||||
Source (natural) | Organism: ![]() ![]() Strain: ATCC 204508 / S288c | |||||||||||||||
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 | ||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 4.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 9421 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||
Atomic model building | PDB-ID: 6LQR Accession code: 6LQR / Source name: PDB / Type: experimental model |