To see a continuous density for the eIF1 and eIF1A initiation factors, apply a Gaussian filtering of 1.05 and a contour level of 0.03
Sample
Sample: 40S-eIF1-eIF1A preinitiation complex
Complex: Ribosome small subunit
Protein or peptide: Eukaryotic initiation factor 1
Protein or peptide: Eukaryotic initiation factor 1A
Keywords
Eukaryotic translation initiation / 48S / small ribosome subunit.
Function / homology
Function and homology information
formation of translation initiation ternary complex / translation reinitiation / multi-eIF complex / eukaryotic 43S preinitiation complex / formation of cytoplasmic translation initiation complex / formation of translation preinitiation complex / eukaryotic 48S preinitiation complex / Formation of the ternary complex, and subsequently, the 43S complex / Translation initiation complex formation / Ribosomal scanning and start codon recognition ...formation of translation initiation ternary complex / translation reinitiation / multi-eIF complex / eukaryotic 43S preinitiation complex / formation of cytoplasmic translation initiation complex / formation of translation preinitiation complex / eukaryotic 48S preinitiation complex / Formation of the ternary complex, and subsequently, the 43S complex / Translation initiation complex formation / Ribosomal scanning and start codon recognition / Formation of a pool of free 40S subunits / L13a-mediated translational silencing of Ceruloplasmin expression / ribosomal small subunit binding / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / regulation of translational fidelity / translation regulator activity / 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 initiation factor binding / translational initiation / translation initiation factor activity / rescue of stalled ribosome / 90S preribosome / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / maturation of SSU-rRNA / small-subunit processome / positive regulation of apoptotic signaling pathway / protein kinase C binding / maintenance of translational fidelity / cytoplasmic stress granule / modification-dependent protein catabolic process / rRNA processing / protein tag activity / double-stranded RNA binding / ribosome binding / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / cytosolic large ribosomal subunit / cytoplasmic translation / rRNA binding / ribosome / protein ubiquitination / structural constituent of ribosome / ribonucleoprotein complex / translation / positive regulation of protein phosphorylation / mRNA binding / ubiquitin protein ligase binding / nucleolus / protein kinase binding / RNA binding / zinc ion binding / nucleus / metal ion binding / cytoplasm / cytosol Similarity search - Function
Eukaryotic translation initiation factor SUI1 / SUI1 domain superfamily / Translation initiation factor SUI1 / Translation initiation factor SUI1 family profile. / SUI1 domain / Translation initiation factor 1A (eIF-1A), conserved site / Eukaryotic initiation factor 1A signature. / eukaryotic translation initiation factor 1A / Translation initiation factor 1A (eIF-1A) / RNA-binding domain, S1, IF1 type ...Eukaryotic translation initiation factor SUI1 / SUI1 domain superfamily / Translation initiation factor SUI1 / Translation initiation factor SUI1 family profile. / SUI1 domain / Translation initiation factor 1A (eIF-1A), conserved site / Eukaryotic initiation factor 1A signature. / eukaryotic translation initiation factor 1A / Translation initiation factor 1A (eIF-1A) / RNA-binding domain, S1, IF1 type / Translation initiation factor 1A / IF-1 / S1 domain IF1 type profile. / : / Ribosomal protein S26e signature. / : / Ribosomal protein L41 / Ribosomal protein L41 / Ribosomal protein S26e / Ribosomal protein S26e superfamily / Ribosomal protein S26e / Ribosomal protein S21e, conserved site / Ribosomal protein S21e signature. / Ribosomal protein S12e signature. / Ribosomal protein S12e / Ribosomal protein S5, eukaryotic/archaeal / Ribosomal protein S19e, conserved site / Ribosomal protein S19e signature. / Small (40S) ribosomal subunit Asc1/RACK1 / Ribosomal protein S2, eukaryotic / Ribosomal protein S21e / Ribosomal protein S21e superfamily / Ribosomal protein S21e / 40S Ribosomal protein S10 / S27a-like superfamily / Ribosomal protein S10, eukaryotic/archaeal / Plectin/S10, N-terminal / Plectin/S10 domain / Ribosomal protein S25 / S25 ribosomal protein / Ribosomal protein S2, eukaryotic/archaeal / : / Ribosomal protein S17e, conserved site / Ribosomal protein S17e signature. / Ribosomal protein S27a / Ribosomal protein S27a / Ribosomal protein S27a / Ribosomal protein S8e subdomain, eukaryotes / Ribosomal protein S30 / Ribosomal protein S30 / 40S ribosomal protein S29/30S ribosomal protein S14 type Z / Ribosomal protein S7e signature. / Ribosomal protein S3, eukaryotic/archaeal / Ribosomal protein S19e / Ribosomal protein S3Ae, conserved site / Ribosomal protein S19e / Ribosomal protein S3Ae signature. / Ribosomal_S19e / Ribosomal protein S27e signature. / Ribosomal protein S4e, N-terminal, conserved site / Ribosomal protein S4e signature. / 40S ribosomal protein S4, C-terminal domain / 40S ribosomal protein S4 C-terminus / Ribosomal protein S19A/S15e / Ribosomal protein S8e, conserved site / Ribosomal protein S8e signature. / Ribosomal protein S17e / Ribosomal protein S17e-like superfamily / Ribosomal S17 / Ribosomal protein S6, eukaryotic / 40S ribosomal protein S1/3, eukaryotes / Ribosomal protein S4e, N-terminal / RS4NT (NUC023) domain / Ribosomal S24e conserved site / Ribosomal protein S24e signature. / 40S ribosomal protein S11, N-terminal / Ribosomal_S17 N-terminal / Ribosomal protein S7e / Ribosomal protein S7e / Ribosomal protein S4, KOW domain / Ribosomal protein S4e / Ribosomal protein S4e, central region / Ribosomal protein S4e, central domain superfamily / Ribosomal family S4e / Ribosomal protein S27, zinc-binding domain superfamily / Ribosomal protein S24e / Ribosomal protein S23, eukaryotic/archaeal / Ribosomal protein S24e / Ribosomal protein S6/S6e/A/B/2, conserved site / Ribosomal protein S6e signature. / Ribosomal protein S27 / Ribosomal protein S27 / Ribosomal protein S8e / Ribosomal protein S17, archaeal/eukaryotic / Ribosomal protein S3Ae / Ribosomal protein S28e conserved site / Ribosomal S3Ae family / Ribosomal protein S28e signature. / Ribosomal S3Ae family / Ribosomal protein S28e / Ribosomal protein S28e Similarity search - Domain/homology
KLLA0B11231p / Small ribosomal subunit protein eS32A / Small ribosomal subunit protein uS11 / Eukaryotic translation initiation factor eIF-1 / Small ribosomal subunit protein eS28 / Eukaryotic translation initiation factor 1A / Ubiquitin-ribosomal protein eS31 fusion protein / KLLA0F25542p / KLLA0F18040p / KLLA0F09812p ...KLLA0B11231p / Small ribosomal subunit protein eS32A / Small ribosomal subunit protein uS11 / Eukaryotic translation initiation factor eIF-1 / Small ribosomal subunit protein eS28 / Eukaryotic translation initiation factor 1A / Ubiquitin-ribosomal protein eS31 fusion protein / KLLA0F25542p / KLLA0F18040p / KLLA0F09812p / KLLA0F07843p / 40S ribosomal protein S12 / Small ribosomal subunit protein eS6 / KLLA0E23673p / 40S ribosomal protein S8 / Small ribosomal subunit protein uS2 / KLLA0E12277p / 40S ribosomal protein S27 / Small ribosomal subunit protein uS14 / KLLA0D10659p / 40S ribosomal protein S3 / 40S ribosomal protein S26 / 40S ribosomal protein S7 / 40S ribosomal protein S24 / 40S ribosomal protein S30 / KLLA0B08173p / Small ribosomal subunit protein uS8 / 40S ribosomal protein S25 / Small ribosomal subunit protein eS1 / 40S ribosomal protein S4 / KLLA0B01562p / KLLA0B01474p / KLLA0A10483p / KLLA0A07194p / Small ribosomal subunit protein eS21 / Small ribosomal subunit protein uS9 Similarity search - Component
Journal: Mol Cell / Year: 2015 Title: Conformational Differences between Open and Closed States of the Eukaryotic Translation Initiation Complex. Authors: Jose L Llácer / Tanweer Hussain / Laura Marler / Colin Echeverría Aitken / Anil Thakur / Jon R Lorsch / Alan G Hinnebusch / V Ramakrishnan / Abstract: Translation initiation in eukaryotes begins with the formation of a pre-initiation complex (PIC) containing the 40S ribosomal subunit, eIF1, eIF1A, eIF3, ternary complex (eIF2-GTP-Met-tRNAi), and ...Translation initiation in eukaryotes begins with the formation of a pre-initiation complex (PIC) containing the 40S ribosomal subunit, eIF1, eIF1A, eIF3, ternary complex (eIF2-GTP-Met-tRNAi), and eIF5. The PIC, in an open conformation, attaches to the 5' end of the mRNA and scans to locate the start codon, whereupon it closes to arrest scanning. We present single particle cryo-electron microscopy (cryo-EM) reconstructions of 48S PICs from yeast in these open and closed states, at 6.0 Å and 4.9 Å, respectively. These reconstructions show eIF2β as well as a configuration of eIF3 that appears to encircle the 40S, occupying part of the subunit interface. Comparison of the complexes reveals a large conformational change in the 40S head from an open mRNA latch conformation to a closed one that constricts the mRNA entry channel and narrows the P site to enclose tRNAi, thus elucidating key events in start codon recognition.
History
Deposition
Jun 15, 2015
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Header (metadata) release
Jul 15, 2015
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Map release
Aug 5, 2015
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Update
Aug 19, 2015
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Current status
Aug 19, 2015
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Details: Quantifoil R2/2 400 mesh copper grids with 4-5 nm thin carbon on top
Vitrification
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 120 K / Instrument: FEI VITROBOT MARK I / Timed resolved state: 30 second incubation time / Method: Blot for 2.5 or 3 seconds before plunging
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Electron microscopy
Microscope
FEI TITAN KRIOS
Alignment procedure
Legacy - Astigmatism: Objective lens astigmatism was corrected at 78,000 times magnification
Details
Complete dataset was collected in 2 non-consecutive days
Date
Apr 28, 2014
Image recording
Category: CCD / Film or detector model: FEI FALCON II (4k x 4k) / Number real images: 2056 / Average electron dose: 27 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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