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Yorodumi- PDB-8aw3: Cryo-EM structure of the Tb ADAT2/3 deaminase in complex with tRNA -
+Open data
-Basic information
Entry | Database: PDB / ID: 8aw3 | ||||||
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Title | Cryo-EM structure of the Tb ADAT2/3 deaminase in complex with tRNA | ||||||
Components |
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Keywords | RNA BINDING PROTEIN / ADAT / inosine / tRNA modification / deaminase / cryo-EM structure / Trypanosoma brucei | ||||||
Function / homology | Function and homology information tRNA wobble adenosine to inosine editing / tRNA-specific adenosine-34 deaminase activity / Hydrolases; Acting on carbon-nitrogen bonds, other than peptide bonds; In cyclic amidines / hydrolase activity / zinc ion binding / nucleoplasm / cytoplasm Similarity search - Function | ||||||
Biological species | Trypanosoma brucei brucei (eukaryote) Trypanosoma brucei (eukaryote) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å | ||||||
Authors | Dolce, L.G. / Tengo, L. / Weis, F. / Kowalinski, E. | ||||||
Funding support | France, 1items
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Citation | Journal: Nat Commun / Year: 2022 Title: Structural basis for sequence-independent substrate selection by eukaryotic wobble base tRNA deaminase ADAT2/3. Authors: Luciano G Dolce / Aubree A Zimmer / Laura Tengo / Félix Weis / Mary Anne T Rubio / Juan D Alfonzo / Eva Kowalinski / Abstract: The essential deamination of adenosine A to inosine at the wobble base is the individual tRNA modification with the greatest effects on mRNA decoding, empowering a single tRNA to translate three ...The essential deamination of adenosine A to inosine at the wobble base is the individual tRNA modification with the greatest effects on mRNA decoding, empowering a single tRNA to translate three different codons. To date, many aspects of how eukaryotic deaminases specifically select their multiple substrates remain unclear. Here, using cryo-EM, we present the structure of a eukaryotic ADAT2/3 deaminase bound to a full-length tRNA, revealing that the enzyme distorts the anticodon loop, but in contrast to the bacterial enzymes, selects its substrate via sequence-independent contacts of eukaryote-acquired flexible or intrinsically unfolded motifs distal from the conserved catalytic core. A gating mechanism for substrate entry to the active site is identified. Our multi-step tRNA recognition model yields insights into how RNA editing by A deamination evolved, shaped the genetic code, and directly impacts the eukaryotic proteome. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 8aw3.cif.gz | 132.4 KB | Display | PDBx/mmCIF format |
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PDB format | pdb8aw3.ent.gz | 94.6 KB | Display | PDB format |
PDBx/mmJSON format | 8aw3.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/aw/8aw3 ftp://data.pdbj.org/pub/pdb/validation_reports/aw/8aw3 | HTTPS FTP |
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-Related structure data
Related structure data | 15690MC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
#1: RNA chain | Mass: 24132.311 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Trypanosoma brucei (eukaryote) / References: GenBank: 62359426 | ||
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#2: Protein | Mass: 23547.535 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Trypanosoma brucei brucei (eukaryote) / Strain: 927/4 GUTat10.1 / Gene: Tb08.29H22.100, Tb927.8.4180 / Production host: Trichoplusia ni (cabbage looper) References: UniProt: Q57W17, Hydrolases; Acting on carbon-nitrogen bonds, other than peptide bonds; In cyclic amidines | ||
#3: Protein | Mass: 40600.254 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Trypanosoma brucei brucei (eukaryote) / Strain: 927/4 GUTat10.1 / Gene: Tb11.01.6930 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: Q381Q7 | ||
#4: Chemical | Has ligand of interest | N | |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component | Name: ADAT2/3 in complex with tRNA / Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT |
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Molecular weight | Value: 0.09 MDa / Experimental value: NO |
Source (natural) | Organism: Trypanosoma brucei brucei (eukaryote) |
Source (recombinant) | Organism: Trichoplusia ni (cabbage looper) |
Buffer solution | pH: 7.5 |
Specimen | Conc.: 0.07 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: GOLD / Grid type: UltrAuFoil R1.2/1.3 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K |
-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: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN |
Electron lens | Mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 1800 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 55 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
-Processing
Software | Name: PHENIX / Version: 1.19.2_4158: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 105718 / Symmetry type: POINT | ||||||||||||||||||||||||
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