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Open data
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Basic information
| Entry | Database: PDB / ID: 9g33 | ||||||
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| Title | Stalled 90S - Utp23-Krr1-deltaC3 | ||||||
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Keywords | RIBOSOME / 90S / pre-ribosome / snoRNA / snR30 / snoRNP / ribosome biogenesis / H/ACA / 18S rRNA | ||||||
| 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 / tRNA acetylation / RNA fragment catabolic process / rRNA small subunit pseudouridine methyltransferase Nep1 / rRNA 2'-O-methylation / Noc4p-Nop14p complex / t-UTP complex ...tRNA wobble cytosine modification / tRNA cytidine N4-acetyltransferase activity / rRNA acetylation involved in maturation of SSU-rRNA / 18S rRNA cytidine N-acetyltransferase activity / tRNA acetylation / RNA fragment catabolic process / rRNA small subunit pseudouridine methyltransferase Nep1 / rRNA 2'-O-methylation / Noc4p-Nop14p complex / t-UTP complex / Pwp2p-containing subcomplex of 90S preribosome / snoRNA guided rRNA 2'-O-methylation / nuclear microtubule / Mpp10 complex / rRNA (pseudouridine) methyltransferase activity / 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 / sno(s)RNA-containing ribonucleoprotein complex / small nuclear ribonucleoprotein complex / rRNA base methylation / U4 snRNA binding / O-methyltransferase activity / SUMOylation of RNA binding proteins / protein localization to nucleolus / mTORC1-mediated signalling / mRNA modification / rRNA methylation / Protein hydroxylation / 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 / 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 / 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 / proteasome assembly / ribosomal subunit export from nucleus / RNA processing / regulation of translational fidelity / 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) / U4/U6 x U5 tri-snRNP complex / ribosomal small subunit export from nucleus / vesicle-mediated transport / Transferases; Acyltransferases; Transferring groups other than aminoacyl groups / RNA endonuclease activity / nuclear periphery / Transferases; Transferring one-carbon groups; Methyltransferases / ribosome assembly / 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 / unfolded protein binding / protein transport / ribosome biogenesis / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / cytosolic small ribosomal subunit / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / cytoplasmic translation / tRNA binding Similarity search - Function | ||||||
| Biological species | ![]() | ||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.05 Å | ||||||
Authors | Thoms, M. / Berninghausen, O. / Beckmann, R. | ||||||
| Funding support | European Union, 1items
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Citation | Journal: Nat Commun / Year: 2025Title: H/ACA snR30 snoRNP guides independent 18S rRNA subdomain formation. Authors: Paulina Fischer / Matthias Thoms / Benjamin Lau / Timo Denk / Maria Kuvshinova / Otto Berninghausen / Dirk Flemming / Ed Hurt / Roland Beckmann / ![]() Abstract: Ribosome biogenesis follows a cascade of pre-rRNA folding and processing steps, coordinated with ribosomal protein incorporation. Nucleolar 90S pre-ribosomes are well-described stable intermediates, ...Ribosome biogenesis follows a cascade of pre-rRNA folding and processing steps, coordinated with ribosomal protein incorporation. Nucleolar 90S pre-ribosomes are well-described stable intermediates, composed of pre-18S rRNA, ribosomal S-proteins, U3 snoRNA, and ~70 assembly factors. However, how numerous snoRNAs control pre-rRNA modification and folding during early maturation events remains unclear. We identify snR30 (human U17), the only essential H/ACA snoRNA in yeast, which binds with Cbf5-Gar1-Nop10-Nhp2 to a pre-18S rRNA subdomain containing platform helices and ES6 of the 40S central domain. Integration into the 90S is blocked by RNA hybridization with snR30. The snoRNP complex coordinates the recruitment of early assembly factors Krr1-Utp23-Kri1 and ribosomal proteins uS11-uS15, enabling isolated subdomain assembly. Krr1-dependent release of snR30 culminates in integration of the platform into the 90S. Our study reveals the essential role of snR30 in chaperoning central domain formation as a discrete assembly unit externalized from the pre-ribosomal core. #1: Journal: Acta Crystallogr., Sect. D: Biol. Crystallogr. / Year: 2018Title: Real-space refinement in PHENIX for cryo-EM and crystallography Authors: Adams, P.D. | ||||||
| History |
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Structure visualization
| Structure viewer | Molecule: Molmil Jmol/JSmol |
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Downloads & links
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Download
| PDBx/mmCIF format | 9g33.cif.gz | 4.7 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb9g33.ent.gz | Display | PDB format | |
| PDBx/mmJSON format | 9g33.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Summary document | 9g33_validation.pdf.gz | 1.5 MB | Display | wwPDB validaton report |
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| Full document | 9g33_full_validation.pdf.gz | 1.6 MB | Display | |
| Data in XML | 9g33_validation.xml.gz | 496.9 KB | Display | |
| Data in CIF | 9g33_validation.cif.gz | 871.3 KB | Display | |
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/g3/9g33 ftp://data.pdbj.org/pub/pdb/validation_reports/g3/9g33 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 50991MC ![]() 9g25C ![]() 9g28C C: citing same article ( M: map data used to model this data |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
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Assembly
| Deposited unit | ![]()
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Components
+RNA chain , 3 types, 3 molecules D3D2D4
+U3 small nucleolar ribonucleoprotein protein ... , 3 types, 3 molecules CJCIJE
+U3 small nucleolar RNA-associated protein ... , 17 types, 17 molecules CKUEUHUKULUMUOUPUNUFUGURUUUDUIUJUT
+Ribosome biogenesis protein ... , 3 types, 3 molecules CLJCUZ
+40S ribosomal protein ... , 13 types, 13 molecules DYDFDIDJDSDEDXDWDGDLDcDQDH
+RRNA-processing protein ... , 2 types, 2 molecules UXJM
+Protein , 16 types, 20 molecules JGJFCACBUCCFCGJHJJJKJQCHJNJOCMJPUQUAJAJB
+Nucleolar complex protein ... , 2 types, 2 molecules UBUS
+Nucleolar protein ... , 2 types, 2 molecules CECD
+Non-polymers , 2 types, 2 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: Utp23-FTpA, Krr1-deltaC3 / Type: RIBOSOME / Entity ID: #1-#61 / Source: NATURAL |
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| Source (natural) | Organism: ![]() |
| Buffer solution | pH: 7.5 |
| Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
| Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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| Microscopy | Model: TFS KRIOS |
| Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
| Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 3500 nm / Nominal defocus min: 500 nm |
| Image recording | Electron dose: 46.4 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
| EM software | Name: PHENIX / Version: 1.19.2_4158: / Category: model refinement | ||||||||||||||||||||||||
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| CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
| 3D reconstruction | Resolution: 3.05 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 32278 / Symmetry type: POINT | ||||||||||||||||||||||||
| Refine LS restraints |
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FIELD EMISSION GUN