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- PDB-6g18: Cryo-EM structure of a late human pre-40S ribosomal subunit - State C -
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Open data
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Basic information
Entry | Database: PDB / ID: 6g18 | |||||||||||||||
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Title | Cryo-EM structure of a late human pre-40S ribosomal subunit - State C | |||||||||||||||
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![]() | RIBOSOME / 40S / pre-40S / ribosome biogenesis | |||||||||||||||
Function / homology | ![]() positive regulation of ribosomal small subunit export from nucleus / regulation of protein localization to nucleolus / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / trophectodermal cell differentiation / positive regulation of rRNA processing / negative regulation of endoplasmic reticulum unfolded protein response / positive regulation of respiratory burst involved in inflammatory response / positive regulation of gastrulation / protein tyrosine kinase inhibitor activity / IRE1-RACK1-PP2A complex ...positive regulation of ribosomal small subunit export from nucleus / regulation of protein localization to nucleolus / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / trophectodermal cell differentiation / positive regulation of rRNA processing / negative regulation of endoplasmic reticulum unfolded protein response / positive regulation of respiratory burst involved in inflammatory response / positive regulation of gastrulation / protein tyrosine kinase inhibitor activity / IRE1-RACK1-PP2A complex / nucleolus organization / positive regulation of Golgi to plasma membrane protein transport / TNFR1-mediated ceramide production / negative regulation of RNA splicing / positive regulation of intrinsic apoptotic signaling pathway by p53 class mediator / regulation of mitotic metaphase/anaphase transition / neural crest cell differentiation / positive regulation of ubiquitin-protein transferase activity / cysteine-type endopeptidase activator activity involved in apoptotic process / negative regulation of intrinsic apoptotic signaling pathway in response to hydrogen peroxide / U3 snoRNA binding / negative regulation of bicellular tight junction assembly / regulation of establishment of cell polarity / 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 / snoRNA binding / preribosome, small subunit precursor / laminin receptor activity / negative regulation of ubiquitin protein ligase activity / ion channel inhibitor activity / pigmentation / Ribosomal scanning and start codon recognition / Translation initiation complex formation / positive regulation of mitochondrial depolarization / fibroblast growth factor binding / negative regulation of Wnt signaling pathway / monocyte chemotaxis / negative regulation of translational frameshifting / Protein hydroxylation / TOR signaling / BH3 domain binding / SARS-CoV-1 modulates host translation machinery / regulation of cell division / mTORC1-mediated signalling / cellular response to ethanol / regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / Peptide chain elongation / Selenocysteine synthesis / Formation of a pool of free 40S subunits / 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 / positive regulation of signal transduction by p53 class mediator / SRP-dependent cotranslational protein targeting to membrane / negative regulation of ubiquitin-dependent protein catabolic process / protein serine/threonine kinase inhibitor activity / Viral mRNA Translation / negative regulation of respiratory burst involved in inflammatory response / Maturation of protein E / Maturation of protein E / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / GTP hydrolysis and joining of the 60S ribosomal subunit / ER Quality Control Compartment (ERQC) / Myoclonic epilepsy of Lafora / FLT3 signaling by CBL mutants / Prevention of phagosomal-lysosomal fusion / L13a-mediated translational silencing of Ceruloplasmin expression / IRAK2 mediated activation of TAK1 complex / Alpha-protein kinase 1 signaling pathway / Glycogen synthesis / IRAK1 recruits IKK complex / IRAK1 recruits IKK complex upon TLR7/8 or 9 stimulation / Membrane binding and targetting of GAG proteins / Endosomal Sorting Complex Required For Transport (ESCRT) / Regulation of TBK1, IKKε (IKBKE)-mediated activation of IRF3, IRF7 / Negative regulation of FLT3 / PTK6 Regulates RTKs and Their Effectors AKT1 and DOK1 / Regulation of TBK1, IKKε-mediated activation of IRF3, IRF7 upon TLR3 ligation / Constitutive Signaling by NOTCH1 HD Domain Mutants / IRAK2 mediated activation of TAK1 complex upon TLR7/8 or 9 stimulation / NOTCH2 Activation and Transmission of Signal to the Nucleus / Major pathway of rRNA processing in the nucleolus and cytosol / TICAM1,TRAF6-dependent induction of TAK1 complex / phagocytic cup / TICAM1-dependent activation of IRF3/IRF7 / APC/C:Cdc20 mediated degradation of Cyclin B / regulation of translational fidelity / Regulation of FZD by ubiquitination / Downregulation of ERBB4 signaling / p75NTR recruits signalling complexes / APC-Cdc20 mediated degradation of Nek2A / 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) / negative regulation of protein binding / InlA-mediated entry of Listeria monocytogenes into host cells / Regulation of pyruvate metabolism Similarity search - Function | |||||||||||||||
Biological species | ![]() | |||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å | |||||||||||||||
![]() | Ameismeier, M. / Cheng, J. / Berninghausen, O. / Beckmann, R. | |||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Visualizing late states of human 40S ribosomal subunit maturation. Authors: Michael Ameismeier / Jingdong Cheng / Otto Berninghausen / Roland Beckmann / ![]() Abstract: The formation of eukaryotic ribosomal subunits extends from the nucleolus to the cytoplasm and entails hundreds of assembly factors. Despite differences in the pathways of ribosome formation, high- ...The formation of eukaryotic ribosomal subunits extends from the nucleolus to the cytoplasm and entails hundreds of assembly factors. Despite differences in the pathways of ribosome formation, high-resolution structural information has been available only from fungi. Here we present cryo-electron microscopy structures of late-stage human 40S assembly intermediates, representing one state reconstituted in vitro and five native states that range from nuclear to late cytoplasmic. The earliest particles reveal the position of the biogenesis factor RRP12 and distinct immature rRNA conformations that accompany the formation of the 40S subunit head. Molecular models of the late-acting assembly factors TSR1, RIOK1, RIOK2, ENP1, LTV1, PNO1 and NOB1 provide mechanistic details that underlie their contribution to a sequential 40S subunit assembly. The NOB1 architecture displays an inactive nuclease conformation that requires rearrangement of the PNO1-bound 3' rRNA, thereby coordinating the final rRNA folding steps with site 3 cleavage. | |||||||||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 2.1 MB | Display | ![]() |
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PDB format | ![]() | 1.6 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.3 MB | Display | |
Data in XML | ![]() | 182.6 KB | Display | |
Data in CIF | ![]() | 300 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 4337MC ![]() 4348C ![]() 4349C ![]() 4350C ![]() 4351C ![]() 4352C ![]() 4353C ![]() 6g4sC ![]() 6g4wC ![]() 6g51C ![]() 6g53C ![]() 6g5hC ![]() 6g5iC 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
+40S ribosomal protein ... , 26 types, 26 molecules FMPQRSTZcABCEGHIJLNOVWXYbe
-Protein , 6 types, 6 molecules fguwvt
#11: Protein | Mass: 18004.041 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#12: Protein | Mass: 35115.652 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#32: Protein | Mass: 91951.188 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#33: Protein | Mass: 49673.258 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#34: Protein | Mass: 63372.992 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: Q9BVS4, non-specific serine/threonine protein kinase |
#35: Protein | Mass: 54935.891 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-RNA-binding protein ... , 2 types, 2 molecules xy
#30: Protein | Mass: 27970.355 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#31: Protein | Mass: 46743.914 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-RNA chain / Non-polymers , 2 types, 3 molecules 2

#1: RNA chain | Mass: 604102.750 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#36: Chemical |
-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: Cryo-EM structure of a human pre-40S ribosomal subunit with bound PNO1, NOB1, TSR1, BYST, RIOK2 and LTV1 Type: RIBOSOME Details: Cytoplasmic precursor of the human small ribosomal subunit (pre-40S) purified by affinity chromatography using the StFLAG-tagged ribosomal biogenesis factor PNO1 Entity ID: #1-#35 / Source: NATURAL |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() |
Buffer solution | pH: 7.6 |
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: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 2.5 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k) |
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Processing
Software | Name: REFMAC / Version: 5.8.0158 / Classification: refinement | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 287847 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement | Resolution: 3.6→260.16 Å / Cor.coef. Fo:Fc: 0.919 / ESU R: 0.622 Stereochemistry target values: MAXIMUM LIKELIHOOD WITH PHASES Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
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Solvent computation | Ion probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.2 Å / Solvent model: MASK | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 104.814 Å2
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Refinement step | Cycle: 1 / Total: 83825 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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