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Yorodumi- PDB-7ajt: Cryo-EM structure of the 90S-exosome super-complex (state Pre-A1-... -
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Basic information
| Entry | Database: PDB / ID: 7ajt | ||||||
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| Title | Cryo-EM structure of the 90S-exosome super-complex (state Pre-A1-exosome) | ||||||
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Keywords | RIBOSOME / Ribosome biogenesis / Exosome / 90S pre-ribosome / A1 cleavage / Mtr4 | ||||||
| Function / homology | Function and homology informationmRNA decay by 3' to 5' exoribonuclease / Butyrate Response Factor 1 (BRF1) binds and destabilizes mRNA / Tristetraprolin (TTP, ZFP36) binds and destabilizes mRNA / TRAMP complex / nuclear polyadenylation-dependent mRNA catabolic process / tRNA wobble cytosine modification / nuclear mRNA surveillance of mRNA 3'-end processing / regulatory ncRNA 3'-end processing / regulation of ribosomal protein gene transcription by RNA polymerase II / tRNA cytidine N4-acetyltransferase activity ...mRNA decay by 3' to 5' exoribonuclease / Butyrate Response Factor 1 (BRF1) binds and destabilizes mRNA / Tristetraprolin (TTP, ZFP36) binds and destabilizes mRNA / TRAMP complex / nuclear polyadenylation-dependent mRNA catabolic process / tRNA wobble cytosine modification / nuclear mRNA surveillance of mRNA 3'-end processing / regulatory ncRNA 3'-end processing / regulation of ribosomal protein gene transcription by RNA polymerase II / tRNA cytidine N4-acetyltransferase activity / rRNA acetylation involved in maturation of SSU-rRNA / 18S rRNA cytidine N-acetyltransferase activity / U1 snRNA 3'-end processing / rRNA small subunit pseudouridine methyltransferase Nep1 / Noc4p-Nop14p complex / box H/ACA snoRNA binding / nuclear polyadenylation-dependent CUT catabolic process / RNA fragment catabolic process / U5 snRNA 3'-end processing / tRNA acetylation / rRNA 2'-O-methylation / TRAMP-dependent tRNA surveillance pathway / exosome (RNase complex) / CURI complex / UTP-C complex / CUT catabolic process / U4 snRNA 3'-end processing / cytoplasmic exosome (RNase complex) / endonucleolytic cleavage in ITS1 upstream of 5.8S rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / t-UTP complex / nuclear microtubule / nuclear polyadenylation-dependent rRNA catabolic process / poly(A)-dependent snoRNA 3'-end processing / Mpp10 complex / snoRNA guided rRNA 2'-O-methylation / Pwp2p-containing subcomplex of 90S preribosome / nuclear exosome (RNase complex) / rRNA (pseudouridine) methyltransferase activity / nuclear-transcribed mRNA catabolic process, non-stop decay / rRNA modification / exonucleolytic trimming to generate mature 3'-end of 5.8S rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / histone H2AQ104 methyltransferase activity / nuclear-transcribed mRNA catabolic process, 3'-5' exonucleolytic nonsense-mediated decay / box C/D sno(s)RNA binding / regulation of rRNA processing / septum digestion after cytokinesis / tRNA re-export from nucleus / snRNA binding / RNA folding chaperone / box C/D sno(s)RNA 3'-end processing / 3'-5' RNA helicase activity / endonucleolytic cleavage in 5'-ETS of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / rRNA methyltransferase activity / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / rDNA heterochromatin / nuclear mRNA surveillance / rRNA catabolic process / 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 / poly(A) binding / rRNA primary transcript binding / mRNA 3'-UTR AU-rich region binding / 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 / protein localization to nucleolus / 90S preribosome assembly / mTORC1-mediated signalling / rRNA methylation / Protein hydroxylation / RNA catabolic process / Hydrolases; Acting on ester bonds; Endoribonucleases producing 5'-phosphomonoesters / mRNA modification / U4 snRNP / U3 snoRNA binding / poly(U) RNA binding / positive regulation of nuclear-transcribed mRNA catabolic process, deadenylation-dependent decay / poly(A)+ mRNA export from nucleus / Formation of the ternary complex, and subsequently, the 43S complex / Translation initiation complex formation / Ribosomal scanning and start codon recognition / snoRNA binding / preribosome, small subunit precursor / precatalytic spliceosome / maturation of 5.8S rRNA / nonfunctional rRNA decay / Major pathway of rRNA processing in the nucleolus and cytosol / rRNA metabolic process / establishment of cell polarity / spliceosomal complex assembly / positive regulation of transcription by RNA polymerase I / SRP-dependent cotranslational protein targeting to membrane Similarity search - Function | ||||||
| Biological species | ![]() ![]() | ||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.6 Å | ||||||
Authors | Cheng, J. / Lau, B. / Flemming, D. / Venuta, G.L. / Berninghausen, O. / Beckmann, R. / Hurt, E. | ||||||
Citation | Journal: Mol Cell / Year: 2021Title: Structure of the Maturing 90S Pre-ribosome in Association with the RNA Exosome. Authors: Benjamin Lau / Jingdong Cheng / Dirk Flemming / Giuseppe La Venuta / Otto Berninghausen / Roland Beckmann / Ed Hurt / ![]() Abstract: Ribosome assembly is catalyzed by numerous trans-acting factors and coupled with irreversible pre-rRNA processing, driving the pathway toward mature ribosomal subunits. One decisive step early in ...Ribosome assembly is catalyzed by numerous trans-acting factors and coupled with irreversible pre-rRNA processing, driving the pathway toward mature ribosomal subunits. One decisive step early in this progression is removal of the 5' external transcribed spacer (5'-ETS), an RNA extension at the 18S rRNA that is integrated into the huge 90S pre-ribosome structure. Upon endo-nucleolytic cleavage at an internal site, A, the 5'-ETS is separated from the 18S rRNA and degraded. Here we present biochemical and cryo-electron microscopy analyses that depict the RNA exosome, a major 3'-5' exoribonuclease complex, in a super-complex with the 90S pre-ribosome. The exosome is docked to the 90S through its co-factor Mtr4 helicase, a processive RNA duplex-dismantling helicase, which strategically positions the exosome at the base of 5'-ETS helices H9-H9', which are dislodged in our 90S-exosome structures. These findings suggest a direct role of the exosome in structural remodeling of the 90S pre-ribosome to drive eukaryotic ribosome synthesis. | ||||||
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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 | 7ajt.cif.gz | 6 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb7ajt.ent.gz | Display | PDB format | |
| PDBx/mmJSON format | 7ajt.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Summary document | 7ajt_validation.pdf.gz | 1.9 MB | Display | wwPDB validaton report |
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| Full document | 7ajt_full_validation.pdf.gz | 2.8 MB | Display | |
| Data in XML | 7ajt_validation.xml.gz | 789.9 KB | Display | |
| Data in CIF | 7ajt_validation.cif.gz | 1.3 MB | Display | |
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/aj/7ajt ftp://data.pdbj.org/pub/pdb/validation_reports/aj/7ajt | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 11807MC ![]() 7ajuC 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
+Protein , 19 types, 23 molecules CACBJAJBUAUCUPUQCFCGCMJFJGJHJIJJJKJNJOJPJQEKEN
+40S ribosomal protein ... , 17 types, 17 molecules DADEDFDGDHDIDJDLDNDODQDSDWDXDYDbDc
+Nucleolar complex protein ... , 2 types, 2 molecules UBUS
+U3 small nucleolar RNA-associated protein ... , 17 types, 17 molecules UDUEUFUGUHUIUJUKULUMUNUOURUTUUUVCK
+RRNA-processing protein ... , 2 types, 2 molecules UXJM
+Ribosome biogenesis protein ... , 3 types, 3 molecules UZCLJC
+Nucleolar protein ... , 2 types, 2 molecules CDCE
+Ribosomal RNA-processing protein ... , 2 types, 2 molecules CHCN
+U3 small nucleolar ribonucleoprotein protein ... , 2 types, 2 molecules CICJ
+RNA chain , 4 types, 4 molecules D2D3D4EA
+Exosome complex component ... , 9 types, 9 molecules EBECEDEEEFEGEHEIEJ
+Non-polymers , 3 types, 7 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-exosome super-complex in state Pre-A1-exosome / Type: RIBOSOME / Entity ID: #1-#79 / Source: NATURAL |
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| Source (natural) | Organism: ![]() |
| Buffer solution | pH: 7.4 |
| 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: FEI TITAN KRIOS |
| Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
| Electron lens | Mode: BRIGHT FIELD |
| Image recording | Electron dose: 44 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
| EM software | Name: CTFFIND / Category: CTF correction |
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| CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
| 3D reconstruction | Resolution: 4.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 6024 / Symmetry type: POINT |
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