ribosome disassembly / ornithine decarboxylase inhibitor activity / misfolded RNA binding / Group I intron splicing / RNA folding / four-way junction DNA binding / negative regulation of translational initiation / regulation of mRNA stability / translation initiation factor activity / mRNA regulatory element binding translation repressor activity ...ribosome disassembly / ornithine decarboxylase inhibitor activity / misfolded RNA binding / Group I intron splicing / RNA folding / four-way junction DNA binding / negative regulation of translational initiation / regulation of mRNA stability / translation initiation factor activity / mRNA regulatory element binding translation repressor activity / positive regulation of RNA splicing / DNA endonuclease activity / transcription antitermination / DNA-templated transcription termination / maintenance of translational fidelity / mRNA 5'-UTR binding / ribosome binding / regulation of translation / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / cytoplasmic translation / tRNA binding / molecular adaptor activity / rRNA binding / ribosome / structural constituent of ribosome / translation / response to antibiotic / zinc ion binding / membrane / cytoplasm / cytosol Similarity search - Function
Translation initiation factor 3, conserved site / Initiation factor 3 signature. / Translation initiation factor 3, C-terminal / Translation initiation factor IF-3, C-terminal domain / Translation initiation factor 3 / Translation initiation factor 3, N-terminal / Translation initiation factor 3 (IF-3), N-terminal domain superfamily / Translation initiation factor 3 (IF-3), C-terminal domain superfamily / Translation initiation factor IF-3, N-terminal domain / Ribosomal protein S21, conserved site ...Translation initiation factor 3, conserved site / Initiation factor 3 signature. / Translation initiation factor 3, C-terminal / Translation initiation factor IF-3, C-terminal domain / Translation initiation factor 3 / Translation initiation factor 3, N-terminal / Translation initiation factor 3 (IF-3), N-terminal domain superfamily / Translation initiation factor 3 (IF-3), C-terminal domain superfamily / Translation initiation factor IF-3, N-terminal domain / Ribosomal protein S21, conserved site / Ribosomal protein S21 signature. / Ribosomal protein S21 superfamily / Ribosomal protein S21 / Ribosomal protein S16, conserved site / Ribosomal protein S16 signature. / Ribosomal protein S21 / Ribosomal protein S12, bacterial-type / Ribosomal protein S6, conserved site / Ribosomal protein S6 signature. / Ribosomal protein S11, bacterial-type / Ribosomal protein S20 / Ribosomal protein S20 superfamily / Ribosomal protein S20 / Ribosomal protein S4, bacterial-type / 30S ribosomal protein S17 / Ribosomal protein S5, bacterial-type / Ribosomal protein S6, plastid/chloroplast / Ribosomal protein S18, conserved site / Ribosomal protein S18 signature. / Ribosomal protein S16 / Ribosomal protein S16 / Ribosomal protein S16 domain superfamily / Ribosomal protein S15, bacterial-type / Ribosomal protein S6 / Ribosomal protein S6 / Ribosomal protein S6 superfamily / Translation elongation factor EF1B/ribosomal protein S6 / Ribosomal protein S18 / Ribosomal protein S18 / Ribosomal protein S18 superfamily / Ribosomal protein S12 signature. / Ribosomal protein S12/S23 / : / Ribosomal protein S5, N-terminal, conserved site / Ribosomal protein S5 signature. / Ribosomal protein S17, conserved site / Ribosomal protein S17 signature. / S5 double stranded RNA-binding domain profile. / Ribosomal protein S5 / Ribosomal protein S5, N-terminal / Ribosomal protein S5, N-terminal domain / Ribosomal protein S5, C-terminal / Ribosomal protein S4/S9 N-terminal domain / Ribosomal protein S5, C-terminal domain / Ribosomal protein S8 signature. / Ribosomal protein S4/S9 N-terminal domain / Ribosomal protein S4/S9, N-terminal / Ribosomal protein S4, conserved site / Ribosomal protein S4 signature. / Ribosomal protein S15 signature. / Ribosomal protein S4/S9 / Ribosomal protein S8 / Ribosomal protein S8 superfamily / Ribosomal protein S8 / S4 RNA-binding domain profile. / Ribosomal protein S12/S23 / Ribosomal S11, conserved site / Ribosomal protein S11 signature. / Ribosomal protein S11 / S4 RNA-binding domain / S4 domain / Ribosomal protein S11 / RNA-binding S4 domain / RNA-binding S4 domain superfamily / Ribosomal protein S17/S11 / Ribosomal protein S17 / Ribosomal protein S15 / Ribosomal_S15 / Ribosomal protein S15 / Ribosomal protein S11 superfamily / S15/NS1, RNA-binding / Ribosomal protein S5 domain 2-type fold, subgroup / Ribosomal protein S5 domain 2-type fold / Nucleic acid-binding, OB-fold Similarity search - Domain/homology
Translation initiation factor IF-3 / Small ribosomal subunit protein bS6 / Small ribosomal subunit protein uS11 / Small ribosomal subunit protein uS12 / Small ribosomal subunit protein bS16 / Small ribosomal subunit protein bS18 / Small ribosomal subunit protein bS20 / Small ribosomal subunit protein uS4 / Small ribosomal subunit protein uS5 / Small ribosomal subunit protein uS8 ...Translation initiation factor IF-3 / Small ribosomal subunit protein bS6 / Small ribosomal subunit protein uS11 / Small ribosomal subunit protein uS12 / Small ribosomal subunit protein bS16 / Small ribosomal subunit protein bS18 / Small ribosomal subunit protein bS20 / Small ribosomal subunit protein uS4 / Small ribosomal subunit protein uS5 / Small ribosomal subunit protein uS8 / Small ribosomal subunit protein uS15 / Small ribosomal subunit protein uS17 / Small ribosomal subunit protein bS21 Similarity search - Component
Biological species
Escherichia coli (E. coli)
Method
single particle reconstruction / cryo EM / Resolution: 4.4 Å
Journal: Proteins / Year: 2023 Title: Initiation factor 3 bound to the 30S ribosomal subunit in an initial step of translation. Authors: Adwaith B Uday / Rishi Kumar Mishra / Tanweer Hussain / Abstract: Bacterial ribosomes require three initiation factors IF1, IF2, and IF3 during the initial steps of translation. These IFs ensure correct base pairing of the initiator tRNA anticodon with the start ...Bacterial ribosomes require three initiation factors IF1, IF2, and IF3 during the initial steps of translation. These IFs ensure correct base pairing of the initiator tRNA anticodon with the start codon in the mRNA located at the P-site of the 30S ribosomal subunit. IF3 is one of the first IFs to bind to the 30S and plays a crucial role in the selection of the correct start codon and codon: anticodon base pairing. IF3 also prevents the premature association of the 50S subunit of ribosomes and aids in ribosome recycling. IF3 is reported to change binding sites and conformation to ensure translation initiation fidelity. A recent study suggested an initial binding of IF3 CTD away from the P-site and that IF1 and IF2 promote the movement of CTD to the P-site and concomitant movement of NTD. Hence, to visualize the position of IF3 in the absence of any other IFs, we determined cryo-EM structure of the 30S-IF3 complex. The map shows that IF3 is present in an extended conformation with CTD present at the P-site and NTD near the platform even in the absence of IF1 and IF2. Hence, IF3 CTD binds at the P-site and moves away during the accommodation of the initiator tRNA at the P-site in the later steps of translation initiation. Overall, we report the structure of 30S-IF3 which demystifies the starting binding site and conformation of IF3 on the 30S ribosomal subunit.
Entire : Complex of the small ribosomal subunit (30S) body and Translation...
Entire
Name: Complex of the small ribosomal subunit (30S) body and Translation initiation factor 3 (IF3) in Escherichia coli
Components
Complex: Complex of the small ribosomal subunit (30S) body and Translation initiation factor 3 (IF3) in Escherichia coli
Organelle or cellular component: Initiation factor 3
Protein or peptide: Translation initiation factor IF-3
Organelle or cellular component: Body of the 30S subunit of ribosome
Protein or peptide: 30S ribosomal protein S18
Protein or peptide: 30S ribosomal protein S21
Protein or peptide: 30S ribosomal protein S20
Protein or peptide: 30S ribosomal protein S17
RNA: 16S ribosomal RNA
Protein or peptide: 30S ribosomal protein S5
Protein or peptide: 30S ribosomal protein S4
Protein or peptide: 30S ribosomal protein S6, fully modified isoform
Protein or peptide: 30S ribosomal protein S8
Protein or peptide: Small ribosomal subunit protein uS11
Protein or peptide: Small ribosomal subunit protein uS12
Protein or peptide: 30S ribosomal protein S15
Protein or peptide: 30S ribosomal protein S16
+
Supramolecule #1: Complex of the small ribosomal subunit (30S) body and Translation...
Supramolecule
Name: Complex of the small ribosomal subunit (30S) body and Translation initiation factor 3 (IF3) in Escherichia coli type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#14
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