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Yorodumi- PDB-9r9p: Yeast 80S with nascent chain in complex with Ssb1-ADP in the S2 state -
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Open data
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Basic information
| Entry | Database: PDB / ID: 9r9p | ||||||||||||||||||||||||||||||
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| Title | Yeast 80S with nascent chain in complex with Ssb1-ADP in the S2 state | ||||||||||||||||||||||||||||||
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Keywords | RIBOSOME / Hsp70 / nascent chain / 80S / Ssb | ||||||||||||||||||||||||||||||
| Function / homology | Function and homology informationMitochondrial unfolded protein response (UPRmt) / translational frameshifting / Gluconeogenesis / Glycolysis / 'de novo' cotranslational protein folding / phosphoglycerate kinase / phosphoglycerate kinase activity / HSF1-dependent transactivation / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / Regulation of HSF1-mediated heat shock response ...Mitochondrial unfolded protein response (UPRmt) / translational frameshifting / Gluconeogenesis / Glycolysis / 'de novo' cotranslational protein folding / phosphoglycerate kinase / phosphoglycerate kinase activity / HSF1-dependent transactivation / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / Regulation of HSF1-mediated heat shock response / regulation of amino acid metabolic process / negative regulation of glucose mediated signaling pathway / positive regulation of translational fidelity / : / RMTs methylate histone arginines / Protein methylation / mTORC1-mediated signalling / Protein hydroxylation / ribosome-associated ubiquitin-dependent protein catabolic process / pre-mRNA 5'-splice site binding / GDP-dissociation inhibitor activity / positive regulation of nuclear-transcribed mRNA catabolic process, deadenylation-dependent decay / nonfunctional rRNA decay / Formation of the ternary complex, and subsequently, the 43S complex / Translation initiation complex formation / response to cycloheximide / Ribosomal scanning and start codon recognition / cleavage in ITS2 between 5.8S rRNA and LSU-rRNA of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / preribosome, small subunit precursor / Major pathway of rRNA processing in the nucleolus and cytosol / mRNA destabilization / : / SRP-dependent cotranslational protein targeting to membrane / GTP hydrolysis and joining of the 60S ribosomal subunit / non-chaperonin molecular chaperone ATPase / negative regulation of mRNA splicing, via spliceosome / preribosome, large subunit precursor / positive regulation of protein kinase activity / Formation of a pool of free 40S subunits / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / negative regulation of translational frameshifting / L13a-mediated translational silencing of Ceruloplasmin expression / translational elongation / G-protein alpha-subunit binding / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / 90S preribosome / Ub-specific processing proteases / translational termination / ribosomal subunit export from nucleus / regulation of translational fidelity / protein-RNA complex assembly / maturation of LSU-rRNA / heat shock 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) / translation regulator activity / ribosomal small subunit export from nucleus / Neutrophil degranulation / DNA-(apurinic or apyrimidinic site) endonuclease activity / protein folding chaperone / rescue of stalled cytosolic ribosome / cellular response to amino acid starvation / protein kinase C binding / ribosome assembly / glycolytic process / ribosomal large subunit biogenesis / maturation of LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / gluconeogenesis / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / macroautophagy / maturation of SSU-rRNA / ATP-dependent protein folding chaperone / translational initiation / small-subunit processome / ADP binding / maintenance of translational fidelity / cytoplasmic stress granule / rRNA processing / unfolded protein binding / ribosome biogenesis / ribosome binding / protein refolding / ribosomal small subunit biogenesis / ribosomal small subunit assembly / 5S rRNA binding / ribosomal large subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / large ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / cytosolic large ribosomal subunit / cytoplasmic translation / calmodulin binding / negative regulation of translation / rRNA binding / structural constituent of ribosome / ribosome / translation / G protein-coupled receptor signaling pathway / negative regulation of gene expression Similarity search - Function | ||||||||||||||||||||||||||||||
| Biological species | ![]() | ||||||||||||||||||||||||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å | ||||||||||||||||||||||||||||||
Authors | Grundmann, L. / Zhang, Y. / Grishkovskaya, I. / Rospert, S. / Haselbach, D. | ||||||||||||||||||||||||||||||
| Funding support | Germany, 5items
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Citation | Journal: Nat Commun / Year: 2026Title: The cotranslational cycle of the ribosome-bound Hsp70 homolog Ssb. Authors: Ying Zhang / Lorenz Grundmann / Leonie Vollmar / Julia Schimpf / Volker Hübscher / Mohd Areeb / Irina Grishkovskaya / Anna Moddemann / Kerstin Werner / Thorsten Hugel / David Haselbach / Sabine Rospert / ![]() Abstract: Coupling of ribosomal translation with cotranslational protein folding is essential for cellular homeostasis. In eukaryotes, Hsp70 and its J-domain cochaperone, the heterodimeric ribosome-associated ...Coupling of ribosomal translation with cotranslational protein folding is essential for cellular homeostasis. In eukaryotes, Hsp70 and its J-domain cochaperone, the heterodimeric ribosome-associated complex (RAC), are central to this process; however, mechanistic insights into the coordination of Hsp70 function with translation remain limited. Here, we present two cryo-EM structures of the ribosome-bound yeast Hsp70 Ssb, identifying Rpl25/uL23 as the ribosomal binding site and revealing its interaction with a model nascent chain. Together with detailed biochemical and mutational analyses, these structures enable us to delineate the intricate RAC-dependent cycle, which positions the substrate binding domain of Ssb-ATP close to the tunnel exit to receive nascent chains. This arrangement allows Ssb to undergo substantial conformational changes upon ATP hydrolysis without steric clashes with the ribosome, while the substrate binding domain of Ssb, now anchored by the tightly bound nascent chain, remains close to the tunnel exit. | ||||||||||||||||||||||||||||||
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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 | 9r9p.cif.gz | 9.7 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb9r9p.ent.gz | Display | PDB format | |
| PDBx/mmJSON format | 9r9p.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/r9/9r9p ftp://data.pdbj.org/pub/pdb/validation_reports/r9/9r9p | HTTPS FTP |
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-Related structure data
| Related structure data | ![]() 53861MC 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 |
| Experimental dataset #1 | Data reference: 10.6019/EMPIAR-12933 / Data set type: EMPIAR / Metadata reference: 10.6019/EMPIAR-12933 |
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Links
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Assembly
| Deposited unit | ![]()
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Components
-RNA chain , 6 types, 6 molecules 56C1C2C3C4
| #1: RNA chain | Mass: 75091.320 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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| #2: RNA chain | Mass: 24445.562 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
| #5: RNA chain | Mass: 1097493.875 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
| #6: RNA chain | Mass: 579761.938 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
| #7: RNA chain | Mass: 50682.922 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
| #8: RNA chain | Mass: 38951.105 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Protein , 3 types, 3 molecules ABSg
| #3: Protein | Mass: 66682.406 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Gene: SSB1, YG101, YDL229W / Production host: ![]() References: UniProt: P11484, non-chaperonin molecular chaperone ATPase |
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| #4: Protein | Mass: 9061.538 Da / Num. of mol.: 1 / Source method: obtained synthetically / Details: Flag-Pgk1_1-70 / Source: (synth.) ![]() |
| #79: Protein | Mass: 34841.219 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
+60S ribosomal protein ... , 38 types, 38 molecules LALBLCLDLELFLGLHLILJLLLMLNLOLPLQLRLSLTLULVLXLYLZLaLbLcLdLeLf...
-Large ribosomal subunit protein ... , 2 types, 2 molecules LWLn
| #30: Protein | Mass: 17595.660 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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| #46: Protein/peptide | Mass: 3354.243 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
+40S ribosomal protein ... , 25 types, 25 molecules SASBSCSESFSGSHSISJSKSLSNSOSPSQSRSSSTSVSWSXSYSZSbSe
-Small ribosomal subunit protein ... , 5 types, 5 molecules SDSUSaScSd
| #52: Protein | Mass: 26542.789 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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| #68: Protein | Mass: 13929.044 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
| #74: Protein | Mass: 13538.922 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
| #76: Protein | Mass: 7578.822 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
| #77: Protein | Mass: 6675.723 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Details
| Has protein modification | Y |
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-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: S. cerevisiae 80S ribosome in a non-rotated, post-translocation state with a P-site tRNA-Met-elongation, a nacent chain (Pgk 1-70), and Ssb1 in the ADP state adapting the S2 conformation Type: RIBOSOME / Entity ID: all / Source: NATURAL |
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| Molecular weight | Experimental value: NO |
| Source (natural) | Organism: ![]() |
| Source (recombinant) | Organism: ![]() |
| Buffer solution | pH: 7.4 |
| Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
| Specimen support | Grid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R3.5/1 |
| 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 magnification: 130000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm / Alignment procedure: COMA FREE |
| Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
| Image recording | Electron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 3 / Num. of real images: 54286 |
| EM imaging optics | Energyfilter name: TFS Selectris X / Energyfilter slit width: 10 eV |
| Image scans | Width: 4096 / Height: 4096 |
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Processing
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| CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
| Particle selection | Num. of particles selected: 3512138 | ||||||||||||||||||||||||
| Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||
| 3D reconstruction | Resolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 14049 / Algorithm: FOURIER SPACE / Symmetry type: POINT | ||||||||||||||||||||||||
| Refinement | Cross valid method: NONE Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||
| Displacement parameters | Biso mean: 70.69 Å2 | ||||||||||||||||||||||||
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