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Yorodumi- PDB-8zdb: Cryo-EM structure of the human ubiquitylated 40S ribosome with RIOK3 -
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Open data
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Basic information
| Entry | Database: PDB / ID: 8zdb | |||||||||||||||||||||||||||||||||||||||
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| Title | Cryo-EM structure of the human ubiquitylated 40S ribosome with RIOK3 | |||||||||||||||||||||||||||||||||||||||
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Keywords | RIBOSOME / ubiquitylation / RIOK3 | |||||||||||||||||||||||||||||||||||||||
| Function / homology | Function and homology informationcellular response to dsDNA / negative regulation of MDA-5 signaling pathway / caspase binding / negative regulation of endoplasmic reticulum unfolded protein response / oxidized pyrimidine DNA binding / response to TNF agonist / positive regulation of base-excision repair / positive regulation of respiratory burst involved in inflammatory response / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage / positive regulation of gastrulation ...cellular response to dsDNA / negative regulation of MDA-5 signaling pathway / caspase binding / negative regulation of endoplasmic reticulum unfolded protein response / oxidized pyrimidine DNA binding / response to TNF agonist / positive regulation of base-excision repair / positive regulation of respiratory burst involved in inflammatory response / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage / positive regulation of gastrulation / protein tyrosine kinase inhibitor activity / positive regulation of endodeoxyribonuclease activity / IRE1-RACK1-PP2A complex / nucleolus organization / positive regulation of Golgi to plasma membrane protein transport / cellular response to dsRNA / positive regulation of innate immune response / TNFR1-mediated ceramide production / negative regulation of DNA repair / negative regulation of RNA splicing / supercoiled DNA binding / neural crest cell differentiation / NF-kappaB complex / cysteine-type endopeptidase activator activity involved in apoptotic process / oxidized purine DNA binding / positive regulation of ubiquitin-protein transferase activity / negative regulation of intrinsic apoptotic signaling pathway in response to hydrogen peroxide / regulation of establishment of cell polarity / negative regulation of bicellular tight junction assembly / ubiquitin-like protein conjugating enzyme binding / negative regulation of phagocytosis / rRNA modification in the nucleus and cytosol / Formation of the ternary complex, and subsequently, the 43S complex / erythrocyte homeostasis / cytoplasmic side of rough endoplasmic reticulum membrane / laminin receptor activity / negative regulation of ubiquitin protein ligase activity / protein kinase A binding / preribosome, small subunit precursor / ion channel inhibitor activity / Ribosomal scanning and start codon recognition / pigmentation / Translation initiation complex formation / positive regulation of mitochondrial depolarization / positive regulation of T cell receptor signaling pathway / negative regulation of Wnt signaling pathway / fibroblast growth factor binding / monocyte chemotaxis / positive regulation of activated T cell proliferation / negative regulation of translational frameshifting / TOR signaling / Protein hydroxylation / BH3 domain binding / SARS-CoV-1 modulates host translation machinery / regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / iron-sulfur cluster binding / regulation of cell division / cellular response to ethanol / mTORC1-mediated signalling / Peptide chain elongation / Selenocysteine synthesis / Formation of a pool of free 40S subunits / positive regulation of intrinsic apoptotic signaling pathway by p53 class mediator / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / Eukaryotic Translation Termination / ubiquitin ligase inhibitor activity / positive regulation of GTPase activity / Response of EIF2AK4 (GCN2) to amino acid deficiency / SRP-dependent cotranslational protein targeting to membrane / negative regulation of ubiquitin-dependent protein catabolic process / protein serine/threonine kinase inhibitor activity / positive regulation of signal transduction by p53 class mediator / Viral mRNA Translation / negative regulation of respiratory burst involved in inflammatory response / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / GTP hydrolysis and joining of the 60S ribosomal subunit / L13a-mediated translational silencing of Ceruloplasmin expression / Major pathway of rRNA processing in the nucleolus and cytosol / phagocytic cup / negative regulation of protein-containing complex assembly / regulation of translational fidelity / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / negative regulation of protein binding / 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) / Protein methylation / Nuclear events stimulated by ALK signaling in cancer / positive regulation of intrinsic apoptotic signaling pathway / spindle assembly / laminin binding / rough endoplasmic reticulum / ribosomal small subunit export from nucleus / positive regulation of cell cycle / translation regulator activity / translation initiation factor binding / gastrulation / Amplification of signal from unattached kinetochores via a MAD2 inhibitory signal / DNA-(apurinic or apyrimidinic site) endonuclease activity / Maturation of protein E / signaling adaptor activity / Maturation of protein E Similarity search - Function | |||||||||||||||||||||||||||||||||||||||
| Biological species | Homo sapiens (human) | |||||||||||||||||||||||||||||||||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å | |||||||||||||||||||||||||||||||||||||||
Authors | Huang, Z. / Wang, M. / Li, Y. / Beckmann, R. / Cheng, J. | |||||||||||||||||||||||||||||||||||||||
| Funding support | 1items
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Citation | Journal: Mol Cell / Year: 2025Title: RIOK3 mediates the degradation of 40S ribosomes. Authors: Zixuan Huang / Frances F Diehl / Mengjiao Wang / Yi Li / Aixia Song / Fei Xavier Chen / Nicolle A Rosa-Mercado / Roland Beckmann / Rachel Green / Jingdong Cheng / ![]() Abstract: Cells tightly regulate ribosome homeostasis to adapt to changing environments. Ribosomes are degraded during stress, but the mechanisms responsible remain unclear. Here, we show that starvation ...Cells tightly regulate ribosome homeostasis to adapt to changing environments. Ribosomes are degraded during stress, but the mechanisms responsible remain unclear. Here, we show that starvation induces the selective depletion of 40S ribosomes following their ubiquitylation by the E3 ligase RNF10. The atypical kinase RIOK3 specifically recognizes these ubiquitylated 40S ribosomes through a unique ubiquitin-interacting motif, visualized by cryoelectron microscopy (cryo-EM). RIOK3 binding and ubiquitin recognition are essential for 40S ribosome degradation during starvation. RIOK3 induces the degradation of ubiquitylated 40S ribosomes through progressive decay of their 18S rRNA beginning at the 3' end, as revealed by cryo-EM structures of degradation intermediates. Together, these data define a pathway and mechanism for stress-induced degradation of 40S ribosomes, directly connecting ubiquitylation to regulation of ribosome homeostasis. | |||||||||||||||||||||||||||||||||||||||
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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 | 8zdb.cif.gz | 1.7 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb8zdb.ent.gz | 1.3 MB | Display | PDB format |
| PDBx/mmJSON format | 8zdb.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Summary document | 8zdb_validation.pdf.gz | 560 KB | Display | wwPDB validaton report |
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| Full document | 8zdb_full_validation.pdf.gz | 597.7 KB | Display | |
| Data in XML | 8zdb_validation.xml.gz | 106.3 KB | Display | |
| Data in CIF | 8zdb_validation.cif.gz | 181.7 KB | Display | |
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/zd/8zdb ftp://data.pdbj.org/pub/pdb/validation_reports/zd/8zdb | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 39956MC ![]() 8zdcC ![]() 8zddC M: map data used to model this data C: citing same article ( |
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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
+Small ribosomal subunit protein ... , 33 types, 33 molecules ABCEGHIJLNOVWXYabdehDFKMPQRSTU...
-Protein , 2 types, 4 molecules fijp
| #34: Protein | Mass: 18004.041 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62979#36: Protein | | Mass: 59178.945 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human)References: UniProt: O14730, non-specific serine/threonine protein kinase |
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-RNA chain / Non-polymers , 2 types, 3 molecules 2

| #1: RNA chain | Mass: 602776.875 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: GenBank: 36162 |
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| #37: Chemical |
-Details
| Has ligand of interest | N |
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| Has protein modification | N |
-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: ubiquitylated 40S ribosome with RIOK3 / Type: RIBOSOME / Entity ID: #1-#36 / Source: NATURAL |
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| Source (natural) | Organism: Homo sapiens (human) |
| 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 / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm |
| 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: RELION / Category: CTF correction |
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| CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
| 3D reconstruction | Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 20179 / Symmetry type: POINT |
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