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- EMDB-4076: Structure of bacterial 30S-IF1-IF3-mRNA-tRNA translation pre-init... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-4076 | |||||||||
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Title | Structure of bacterial 30S-IF1-IF3-mRNA-tRNA translation pre-initiation complex, open form (state-2A) | |||||||||
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![]() | ribosome / translation / initiation factors / 30S / IF1 / IF3 / tRNAi / PIC / Thermus thermophilus | |||||||||
Function / homology | ![]() ribosome disassembly / translation initiation factor activity / ribosome binding / ribosomal small subunit assembly / ribosomal small subunit biogenesis / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / tRNA binding / rRNA binding ...ribosome disassembly / translation initiation factor activity / ribosome binding / ribosomal small subunit assembly / ribosomal small subunit biogenesis / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / tRNA binding / rRNA binding / ribosome / structural constituent of ribosome / translation / ribonucleoprotein complex / mRNA binding / zinc ion binding / membrane / metal ion binding / cytosol / cytoplasm Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 4.2 Å | |||||||||
![]() | Hussain T / Llacer JL | |||||||||
![]() | ![]() Title: Large-Scale Movements of IF3 and tRNA during Bacterial Translation Initiation. Authors: Tanweer Hussain / Jose L Llácer / Brian T Wimberly / Jeffrey S Kieft / V Ramakrishnan / ![]() ![]() Abstract: In bacterial translational initiation, three initiation factors (IFs 1-3) enable the selection of initiator tRNA and the start codon in the P site of the 30S ribosomal subunit. Here, we report 11 ...In bacterial translational initiation, three initiation factors (IFs 1-3) enable the selection of initiator tRNA and the start codon in the P site of the 30S ribosomal subunit. Here, we report 11 single-particle cryo-electron microscopy (cryoEM) reconstructions of the complex of bacterial 30S subunit with initiator tRNA, mRNA, and IFs 1-3, representing different steps along the initiation pathway. IF1 provides key anchoring points for IF2 and IF3, thereby enhancing their activities. IF2 positions a domain in an extended conformation appropriate for capturing the formylmethionyl moiety charged on tRNA. IF3 and tRNA undergo large conformational changes to facilitate the accommodation of the formylmethionyl-tRNA (fMet-tRNA(fMet)) into the P site for start codon recognition. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 59.4 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 44.3 KB 44.3 KB | Display Display | ![]() |
Images | ![]() | 181 KB | ||
Filedesc metadata | ![]() | 9.5 KB | ||
Others | ![]() ![]() | 57.2 MB 57.3 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 910.1 KB | Display | ![]() |
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Full document | ![]() | 909.7 KB | Display | |
Data in XML | ![]() | 12.2 KB | Display | |
Data in CIF | ![]() | 14.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 5lmqMC ![]() 4073C ![]() 4074C ![]() 4075C ![]() 4077C ![]() 4078C ![]() 4079C ![]() 4080C ![]() 4081C ![]() 4082C ![]() 4083C ![]() 5lmnC ![]() 5lmoC ![]() 5lmpC ![]() 5lmrC ![]() 5lmsC ![]() 5lmtC ![]() 5lmuC ![]() 5lmvC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.34 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Half map: #1
File | emd_4076_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #2
File | emd_4076_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
+Entire : 30S-IF1-IF3-mRNA-tRNA pre-initiation complex, open form (state-2A)
+Supramolecule #1: 30S-IF1-IF3-mRNA-tRNA pre-initiation complex, open form (state-2A)
+Macromolecule #1: 16S rRNA
+Macromolecule #24: mRNA
+Macromolecule #25: tRNA
+Macromolecule #2: 30S ribosomal protein S2
+Macromolecule #3: 30S ribosomal protein S3
+Macromolecule #4: 30S ribosomal protein S4
+Macromolecule #5: 30S ribosomal protein S5
+Macromolecule #6: 30S ribosomal protein S6
+Macromolecule #7: 30S ribosomal protein S7
+Macromolecule #8: 30S ribosomal protein S8
+Macromolecule #9: 30S ribosomal protein S9
+Macromolecule #10: 30S ribosomal protein S10
+Macromolecule #11: 30S ribosomal protein S11
+Macromolecule #12: 30S ribosomal protein S12
+Macromolecule #13: 30S ribosomal protein S13
+Macromolecule #14: 30S ribosomal protein S14 type Z
+Macromolecule #15: 30S ribosomal protein S15
+Macromolecule #16: 30S ribosomal protein S16
+Macromolecule #17: 30S ribosomal protein S17
+Macromolecule #18: 30S ribosomal protein S18
+Macromolecule #19: 30S ribosomal protein S19
+Macromolecule #20: 30S ribosomal protein S20
+Macromolecule #21: 30S ribosomal protein Thx
+Macromolecule #22: Translation initiation factor IF-1
+Macromolecule #23: Translation initiation factor IF-3
+Macromolecule #26: MAGNESIUM ION
+Macromolecule #27: ZINC ION
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.08 mg/mL | ||||||||||||
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Buffer | pH: 7.5 Component:
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Grid | Model: Quantifoil / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 20 sec. | ||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK I |
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Electron microscopy
Microscope | FEI POLARA 300 |
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Temperature | Min: 90.0 K / Max: 100.0 K |
Image recording | Film or detector model: OTHER / Number grids imaged: 5 / Number real images: 4400 / Average exposure time: 1.1 sec. / Average electron dose: 30.0 e/Å2 Details: Recorded in a FEI Falcon III direct electron detector. Images were collected in movie-mode at 32 frames per second |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 50.0 µm / Calibrated magnification: 104478 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.0 mm / Nominal defocus max: 3.5 µm / Nominal defocus min: 1.5 µm / Nominal magnification: 78000 |
Sample stage | Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Tecnai Polara / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Refinement | Space: RECIPROCAL / Protocol: OTHER / Target criteria: FSC |
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Output model | ![]() PDB-5lmq: |