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Yorodumi- PDB-6lqq: 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: 6lqq | |||||||||
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| Title | Cryo-EM structure of 90S small subunit preribosomes in transition states (State B) | |||||||||
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Keywords | RIBOSOME / ribosome assembly / 90S to pre-40S transition / cryo-EM / Dhr1 | |||||||||
| Function / homology | Function and homology informationtRNA wobble cytosine modification / tRNA cytidine N4-acetyltransferase activity / rRNA acetylation involved in maturation of SSU-rRNA / 18S rRNA cytidine N-acetyltransferase activity / regulation of ribosomal protein gene transcription by RNA polymerase II / tRNA acetylation / box H/ACA snoRNA binding / RNA fragment catabolic process / rRNA small subunit pseudouridine methyltransferase Nep1 / CURI complex ...tRNA wobble cytosine modification / tRNA cytidine N4-acetyltransferase activity / rRNA acetylation involved in maturation of SSU-rRNA / 18S rRNA cytidine N-acetyltransferase activity / regulation of ribosomal protein gene transcription by RNA polymerase II / tRNA acetylation / box H/ACA snoRNA binding / RNA fragment catabolic process / rRNA small subunit pseudouridine methyltransferase Nep1 / CURI complex / UTP-C complex / rRNA 2'-O-methylation / Noc4p-Nop14p complex / endonucleolytic cleavage in ITS1 upstream of 5.8S rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / t-UTP complex / Pwp2p-containing subcomplex of 90S preribosome / nuclear microtubule / Mpp10 complex / rRNA (pseudouridine) methyltransferase activity / box C/D sno(s)RNA binding / snoRNA guided rRNA 2'-O-methylation / rRNA modification / histone H2AQ104 methyltransferase activity / septum digestion after cytokinesis / regulation of rRNA processing / tRNA re-export from nucleus / snRNA binding / RNA folding chaperone / box C/D sno(s)RNA 3'-end processing / rRNA methyltransferase activity / rDNA heterochromatin / endonucleolytic cleavage in 5'-ETS of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / regulation of transcription by RNA polymerase I / endonucleolytic cleavage to generate mature 5'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / box C/D methylation guide snoRNP complex / U4/U6 snRNP / positive regulation of rRNA processing / tRNA export from nucleus / single-stranded telomeric DNA binding / rRNA primary transcript binding / small nuclear ribonucleoprotein complex / sno(s)RNA-containing ribonucleoprotein complex / Negative regulators of DDX58/IFIH1 signaling / rRNA base methylation / U4 snRNA binding / O-methyltransferase activity / SUMOylation of RNA binding proteins / 90S preribosome assembly / protein localization to nucleolus / mTORC1-mediated signalling / mRNA modification / rRNA methylation / Protein hydroxylation / U4 snRNP / poly(U) RNA binding / 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 / Ribosomal scanning and start codon recognition / snoRNA binding / precatalytic spliceosome / preribosome, small subunit precursor / Major pathway of rRNA processing in the nucleolus and cytosol / establishment of cell polarity / spliceosomal complex assembly / positive regulation of transcription by RNA polymerase I / SRP-dependent cotranslational protein targeting to membrane / GTP hydrolysis and joining of the 60S ribosomal subunit / nucleolar large rRNA transcription by RNA polymerase I / 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 / RNA processing / regulation of translational fidelity / ribosomal subunit export from nucleus / U4/U6 x U5 tri-snRNP complex / 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 / Transferases; Acyltransferases; Transferring groups other than aminoacyl groups / RNA endonuclease 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 / spliceosomal complex / small-subunit processome / translational initiation / enzyme activator activity / mRNA splicing, via spliceosome / maintenance of translational fidelity / rRNA processing / peroxisome / protein transport / ribosome biogenesis Similarity search - Function | |||||||||
| Biological species | ![]() ![]() | |||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.1 Å | |||||||||
Authors | Du, Y. / Ye, K. | |||||||||
| Funding support | China, 2items
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Citation | Journal: Science / Year: 2020Title: 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. | |||||||||
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Structure visualization
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| Structure viewer | Molecule: Molmil Jmol/JSmol |
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Downloads & links
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Download
| PDBx/mmCIF format | 6lqq.cif.gz | 5.2 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb6lqq.ent.gz | Display | PDB format | |
| PDBx/mmJSON format | 6lqq.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Summary document | 6lqq_validation.pdf.gz | 1.8 MB | Display | wwPDB validaton report |
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| Full document | 6lqq_full_validation.pdf.gz | 1.9 MB | Display | |
| Data in XML | 6lqq_validation.xml.gz | 552.8 KB | Display | |
| Data in CIF | 6lqq_validation.cif.gz | 938.1 KB | Display | |
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/lq/6lqq ftp://data.pdbj.org/pub/pdb/validation_reports/lq/6lqq | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 0950MC ![]() 0949C ![]() 0951C ![]() 0952C ![]() 0953C ![]() 0954C ![]() 0955C ![]() 6lqpC ![]() 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 ... , 16 types, 16 molecules SCSFSGSHSISJSKSMSOSPSRSXSYSZScSd
+Protein , 17 types, 21 molecules 3B3C3G3HAGB15B5H5IRCRDRGRHRKRLRMRSRTRVRYX1
+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 ... , 2 types, 2 molecules RARJ
+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 B) / Type: COMPLEX / Entity ID: #1-#66 / 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 | |||||||||||||||
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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: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
| 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: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 17924 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||||||
| Atomic model building | PDB-ID: 6LQP Accession code: 6LQP / Source name: PDB / Type: experimental model |
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China, 2items
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