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- EMDB-3886: Cryo-EM structure of a late pre-40S ribosomal subunit from Saccha... -

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Basic information

Entry
Database: EMDB / ID: EMD-3886
TitleCryo-EM structure of a late pre-40S ribosomal subunit from Saccharomyces cerevisiae
Map dataCryo-EM structure of a late pre-40S ribosomal subunit from Saccharomyces cerevisiae
Sample
  • Complex: pre-40S ribosomal subunit from Saccharomyces cerevisiae
Function / homology
Function and homology information


positive regulation of RNA import into nucleus / endonucleolytic cleavage to generate mature 5'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, LSU-rRNA,5S) / Protein methylation / RMTs methylate histone arginines / positive regulation of translational fidelity / mTORC1-mediated signalling / Protein hydroxylation / U3 snoRNA binding ...positive regulation of RNA import into nucleus / endonucleolytic cleavage to generate mature 5'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, LSU-rRNA,5S) / Protein methylation / RMTs methylate histone arginines / positive regulation of translational fidelity / mTORC1-mediated signalling / Protein hydroxylation / U3 snoRNA binding / : / poly(A)+ mRNA export from nucleus / positive regulation of nuclear-transcribed mRNA catabolic process, deadenylation-dependent decay / Formation of the ternary complex, and subsequently, the 43S complex / Translation initiation complex formation / Ribosomal scanning and start codon recognition / preribosome, small subunit precursor / snoRNA binding / Major pathway of rRNA processing in the nucleolus and cytosol / SRP-dependent cotranslational protein targeting to membrane / 90S preribosome / GTP hydrolysis and joining of the 60S ribosomal subunit / 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) / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / L13a-mediated translational silencing of Ceruloplasmin expression / proteasome assembly / 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) / regulation of translational fidelity / ribonucleoprotein complex binding / maturation of SSU-rRNA / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / small-subunit processome / maintenance of translational fidelity / modification-dependent protein catabolic process / ribosomal small subunit biogenesis / small ribosomal subunit rRNA binding / protein tag activity / ribosomal small subunit assembly / rRNA processing / cytoplasmic stress granule / cytosolic small ribosomal subunit / unfolded protein binding / ribosome biogenesis / cytoplasmic translation / small ribosomal subunit / rRNA binding / protein ubiquitination / non-specific serine/threonine protein kinase / ribosome / protein kinase activity / structural constituent of ribosome / translation / phosphorylation / protein serine kinase activity / mRNA binding / GTPase activity / protein serine/threonine kinase activity / ubiquitin protein ligase binding / GTP binding / nucleolus / mitochondrion / RNA binding / nucleoplasm / ATP binding / metal ion binding / nucleus / cytosol / cytoplasm
Similarity search - Function
Serine/threonine-protein kinase Rio2 / RIO2 kinase winged helix domain, N-terminal / Rio2, N-terminal / RIO kinase / RIO-like kinase / RIO1 family / Krr1, KH1 domain / Krr1 KH1 domain / Bystin / Bystin ...Serine/threonine-protein kinase Rio2 / RIO2 kinase winged helix domain, N-terminal / Rio2, N-terminal / RIO kinase / RIO-like kinase / RIO1 family / Krr1, KH1 domain / Krr1 KH1 domain / Bystin / Bystin / Ribosome biogenesis protein BMS1/TSR1, C-terminal / AARP2CN / Bms1/Tsr1-type G domain / Ribosome biogenesis protein Bms1/Tsr1 / 40S ribosome biogenesis protein Tsr1 and BMS1 C-terminal / AARP2CN (NUC121) domain / Bms1-type guanine nucleotide-binding (G) domain profile. / AARP2CN (NUC121) domain / Protein of unknown function (DUF663) / K Homology domain, type 1 superfamily / : / Ribosomal protein S12e / Ribosomal protein S21e, conserved site / Ribosomal protein S19e, conserved site / S27a-like superfamily / Ribosomal protein S25 / Ribosomal protein S17e, conserved site / : / Ribosomal protein S2, eukaryotic / Ribosomal protein S30 / Ribosomal protein S27a / Ribosomal protein S27a / Ribosomal protein S21e / Ribosomal protein S21e superfamily / Ribosomal protein S21e / Ribosomal protein S8e subdomain, eukaryotes / S25 ribosomal protein / Ribosomal protein S19A/S15e / Ribosomal protein S21e signature. / Ribosomal protein S30 / Ribosomal protein S3Ae, conserved site / Ribosomal protein S12e signature. / Ribosomal protein S17e / Ribosomal protein S17e-like superfamily / Ribosomal protein S27a / Ribosomal protein S2, eukaryotic/archaeal / Ribosomal protein S19e / Ribosomal_S19e / Ribosomal protein S5, eukaryotic/archaeal / Ribosomal protein S8e, conserved site / 40S ribosomal protein S11, N-terminal / 40S ribosomal protein S1/3, eukaryotes / Ribosomal protein S6, eukaryotic / Ribosomal protein S7e / 40S ribosomal protein S4, C-terminal domain / Ribosomal protein S4e, N-terminal, conserved site / Ribosomal S17 / Ribosomal protein S19e signature. / Ribosomal protein S19e / Ribosomal protein S27, zinc-binding domain superfamily / Ribosomal protein S17, archaeal/eukaryotic / Ribosomal protein S27 / Ribosomal protein S28e conserved site / Ribosomal protein S6/S6e/A/B/2, conserved site / Ribosomal protein S28e / 40S ribosomal protein S4 C-terminus / Ribosomal protein S4e, N-terminal / Ribosomal protein S23, eukaryotic/archaeal / Ribosomal_S17 N-terminal / Ribosomal protein S3Ae / Ribosomal S3Ae family / Ribosomal protein S7e / Ribosomal protein S8e / Ribosomal protein S4, KOW domain / Ribosomal protein S5/S7, eukaryotic/archaeal / Ribosomal protein S4e / Ribosomal protein S4e, central region / Ribosomal protein S4e, central domain superfamily / Ribosomal protein S6e / Ribosomal protein S13/S15, N-terminal / Ribosomal protein S15P / Ribosomal S13/S15 N-terminal domain / Ribosomal protein S6e / Ribosomal protein S4/S9, eukaryotic/archaeal / RS4NT (NUC023) domain / Ribosomal protein S27 / Ribosomal S3Ae family / Ribosomal protein S17e signature. / Ribosomal protein S28e / Ribosomal family S4e / Ribosomal S13/S15 N-terminal domain / Ribosomal protein S7e signature. / Ribosomal protein S6e / Ribosomal protein S3Ae signature. / Ribosomal protein S27e signature. / Ribosomal protein S4e signature. / Ribosomal protein S8e signature. / Ribosomal S24e conserved site / Ribosomal protein S24e signature. / Ribosomal protein S24e
Similarity search - Domain/homology
Small ribosomal subunit protein uS4A / Small ribosomal subunit protein eS17A / Small ribosomal subunit protein uS15 / Ubiquitin-ribosomal protein eS31 fusion protein / Small ribosomal subunit protein uS11A / Small ribosomal subunit protein eS19A / Small ribosomal subunit protein eS21A / Small ribosomal subunit protein uS8A / Small ribosomal subunit protein eS28B / Small ribosomal subunit protein uS12A ...Small ribosomal subunit protein uS4A / Small ribosomal subunit protein eS17A / Small ribosomal subunit protein uS15 / Ubiquitin-ribosomal protein eS31 fusion protein / Small ribosomal subunit protein uS11A / Small ribosomal subunit protein eS19A / Small ribosomal subunit protein eS21A / Small ribosomal subunit protein uS8A / Small ribosomal subunit protein eS28B / Small ribosomal subunit protein uS12A / Small ribosomal subunit protein eS24A / Small ribosomal subunit protein eS30A / Small ribosomal subunit protein eS4A / Small ribosomal subunit protein eS6A / Small ribosomal subunit protein eS8A / Small ribosomal subunit protein uS17A / Small ribosomal subunit protein uS9A / Small ribosomal subunit protein uS13A / Small ribosomal subunit protein uS5 / Small ribosomal subunit protein uS7 / Small ribosomal subunit protein eS7A / Small ribosomal subunit protein uS2A / Small ribosomal subunit protein eS1A / Small ribosomal subunit protein eS27A / Essential nuclear protein 1 / Serine/threonine-protein kinase RIO2 / Small ribosomal subunit protein eS12 / Small ribosomal subunit protein uS19 / Ribosome biogenesis protein TSR1 / Small ribosomal subunit protein eS25A / Pre-rRNA-processing protein PNO1
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsHeuer A / Thomson E / Schmidt C / Berninghausen O / Becker T / Hurt E / Beckmann R
CitationJournal: Elife / Year: 2017
Title: Cryo-EM structure of a late pre-40S ribosomal subunit from .
Authors: André Heuer / Emma Thomson / Christian Schmidt / Otto Berninghausen / Thomas Becker / Ed Hurt / Roland Beckmann /
Abstract: Mechanistic understanding of eukaryotic ribosome formation requires a detailed structural knowledge of the numerous assembly intermediates, generated along a complex pathway. Here, we present the ...Mechanistic understanding of eukaryotic ribosome formation requires a detailed structural knowledge of the numerous assembly intermediates, generated along a complex pathway. Here, we present the structure of a late pre-40S particle at 3.6 Å resolution, revealing in molecular detail how assembly factors regulate the timely folding of pre-18S rRNA. The structure shows that, rather than sterically blocking 40S translational active sites, the associated assembly factors Tsr1, Enp1, Rio2 and Pno1 collectively preclude their final maturation, thereby preventing untimely tRNA and mRNA binding and error prone translation. Moreover, the structure explains how Pno1 coordinates the 3'end cleavage of the 18S rRNA by Nob1 and how the late factor's removal in the cytoplasm ensures the structural integrity of the maturing 40S subunit.
History
Header (metadata) releaseOct 12, 2016-
DepositionSep 28, 2017-
Map releaseNov 29, 2017-
UpdateMar 28, 2018-
Current statusMar 28, 2018Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0722
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by height
  • Surface level: 0.0722
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6eml
  • Surface level: 0.0722
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_3886.png

Downloads & links

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Map

FileDownload / File: emd_3886.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryo-EM structure of a late pre-40S ribosomal subunit from Saccharomyces cerevisiae
Voxel sizeX=Y=Z: 1.084 Å
Density
Contour LevelBy AUTHOR: 0.0722 / Movie #1: 0.0722
Minimum - Maximum-0.2616892 - 0.5234815
Average (Standard dev.)0.00002545438 (±0.016299982)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 416.25598 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0841.0841.084
M x/y/z384384384
origin x/y/z0.0000.0000.000
length x/y/z416.256416.256416.256
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS384384384
D min/max/mean-0.2620.5230.000

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Supplemental data

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Sample components

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Entire : pre-40S ribosomal subunit from Saccharomyces cerevisiae

EntireName: pre-40S ribosomal subunit from Saccharomyces cerevisiae
Components
  • Complex: pre-40S ribosomal subunit from Saccharomyces cerevisiae

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Supramolecule #1: pre-40S ribosomal subunit from Saccharomyces cerevisiae

SupramoleculeName: pre-40S ribosomal subunit from Saccharomyces cerevisiae
type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Molecular weightTheoretical: 1.2 MDa

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4
Component:
ConcentrationNameFormula
50.0 mMTrisHCl
100.0 mMPotassium chlorideNaClSodium chloride
1.5 mMMagnesium chlorideMgCl2
1.0 mMDithiothreitolDTT
GridModel: Quantifoil R3/3 / Material: COPPER/PALLADIUM / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Support film - Film thickness: 2.0 nm / Pretreatment - Type: GLOW DISCHARGE
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 278 K / Instrument: FEI VITROBOT MARK IV
DetailsPurified 40S ribosomal subunits were reconstituted with purified, recombinantly expressed ABCE1

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Electron microscopy

MicroscopeFEI TITAN
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated defocus min: 0.8 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.4 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: FEI FALCON II (4k x 4k) / Average electron dose: 2.4 e/Å2

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Image processing

CTF correctionSoftware - Name: Gctf (ver. 1.08)
Startup modelType of model: OTHER / Details: yeast 40S ribosome
Initial angle assignmentType: PROJECTION MATCHING / Software - Name: RELION (ver. 2.0)
Final 3D classificationSoftware - Name: RELION (ver. 2.0)
Final angle assignmentType: PROJECTION MATCHING / Software - Name: RELION (ver. 2.0)
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 2.0) / Number images used: 84100
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: FLEXIBLE FIT
Output model

PDB-6eml:
Cryo-EM structure of a late pre-40S ribosomal subunit from Saccharomyces cerevisiae

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