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Yorodumi- PDB-8zdd: Cryo-EM structure of the human ubiquitylated pre-40S ribosome wit... -
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Open data
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Basic information
| Entry | Database: PDB / ID: 8zdd | ||||||||||||||||||||||||||||||||||||||||||
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| Title | Cryo-EM structure of the human ubiquitylated pre-40S ribosome with RIOK3 (without NOB1) | ||||||||||||||||||||||||||||||||||||||||||
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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 / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / cellular response to dsRNA / positive regulation of innate immune response / negative regulation of endoplasmic reticulum unfolded protein response / oxidized pyrimidine DNA binding / response to TNF agonist / positive regulation of base-excision repair ...cellular response to dsDNA / negative regulation of MDA-5 signaling pathway / caspase binding / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / cellular response to dsRNA / positive regulation of innate immune response / 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 gastrulation / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage / protein tyrosine kinase inhibitor activity / positive regulation of ubiquitin-protein transferase activity / IRE1-RACK1-PP2A complex / positive regulation of Golgi to plasma membrane protein transport / nucleolus organization / positive regulation of DNA-templated transcription initiation / TNFR1-mediated ceramide production / negative regulation of RNA splicing / U3 snoRNA binding / supercoiled DNA binding / negative regulation of DNA repair / neural crest cell differentiation / NF-kappaB complex / cytoplasmic translational initiation / oxidized purine DNA binding / cysteine-type endopeptidase activator activity involved in apoptotic process / negative regulation of intrinsic apoptotic signaling pathway in response to hydrogen peroxide / negative regulation of bicellular tight junction assembly / preribosome, small subunit precursor / regulation of establishment of cell polarity / ubiquitin-like protein conjugating enzyme binding / rRNA modification in the nucleus and cytosol / negative regulation of phagocytosis / erythrocyte homeostasis / Formation of the ternary complex, and subsequently, the 43S complex / cytoplasmic side of rough endoplasmic reticulum membrane / protein kinase A binding / ion channel inhibitor activity / laminin receptor activity / Ribosomal scanning and start codon recognition / pigmentation / Translation initiation complex formation / positive regulation of mitochondrial depolarization / negative regulation of Wnt signaling pathway / fibroblast growth factor binding / negative regulation of translational frameshifting / TOR signaling / monocyte chemotaxis / BH3 domain binding / Protein hydroxylation / SARS-CoV-1 modulates host translation machinery / regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / iron-sulfur cluster binding / mTORC1-mediated signalling / positive regulation of GTPase activity / Peptide chain elongation / regulation of cell division / cellular response to ethanol / Selenocysteine synthesis / Formation of a pool of free 40S subunits / positive regulation of intrinsic apoptotic signaling pathway by p53 class mediator / Eukaryotic Translation Termination / protein serine/threonine kinase inhibitor activity / SRP-dependent cotranslational protein targeting to membrane / Response of EIF2AK4 (GCN2) to amino acid deficiency / Viral mRNA Translation / negative regulation of protein binding / ubiquitin ligase inhibitor activity / negative regulation of respiratory burst involved in inflammatory response / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / positive regulation of signal transduction by p53 class mediator / negative regulation of ubiquitin-dependent protein catabolic process / 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 / negative regulation of protein-containing complex assembly / positive regulation of microtubule polymerization / regulation of translational fidelity / phagocytic cup / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / positive regulation of intrinsic apoptotic signaling pathway / spindle assembly / Protein methylation / Nuclear events stimulated by ALK signaling in cancer / 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) / translation regulator activity / rough endoplasmic reticulum / laminin binding / positive regulation of cell cycle / ribosomal small subunit export from nucleus / translation initiation factor binding / gastrulation / Maturation of protein E / Amplification of signal from unattached kinetochores via a MAD2 inhibitory signal / DNA-(apurinic or apyrimidinic site) endonuclease activity / Maturation of protein E Similarity search - Function | ||||||||||||||||||||||||||||||||||||||||||
| Biological species | Homo sapiens (human) | ||||||||||||||||||||||||||||||||||||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.7 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 | 8zdd.cif.gz | 1.8 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb8zdd.ent.gz | 1.4 MB | Display | PDB format |
| PDBx/mmJSON format | 8zdd.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/zd/8zdd ftp://data.pdbj.org/pub/pdb/validation_reports/zd/8zdd | HTTPS FTP |
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-Related structure data
| Related structure data | ![]() 39958MC ![]() 8zdbC ![]() 8zdcC 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 ... , 30 types, 30 molecules RABCEGHIJLNOVWXYbdDFKMPQSTUZcg
-Protein , 5 types, 6 molecules xutpij
| #19: Protein | Mass: 27970.355 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q9NRX1 |
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| #20: Protein | Mass: 91951.188 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q2NL82 |
| #21: Protein | Mass: 54935.891 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q96GA3 |
| #35: 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 |
| #36: Protein | Mass: 8576.831 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62979 |
-RNA chain / Non-polymers , 2 types, 2 molecules 2

| #1: RNA chain | Mass: 604100.750 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) |
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| #37: Chemical | ChemComp-ZN / |
-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 pre-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: 58 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k 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: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 34363 / Symmetry type: POINT |
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