ribosome disassembly / ornithine decarboxylase inhibitor activity / transcription antitermination factor activity, RNA binding / 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 ...ribosome disassembly / ornithine decarboxylase inhibitor activity / transcription antitermination factor activity, RNA binding / 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 / transcription elongation factor complex / regulation of DNA-templated transcription elongation / DNA endonuclease activity / transcription antitermination / DNA-templated transcription termination / maintenance of translational fidelity / mRNA 5'-UTR binding / regulation of translation / ribosome biogenesis / ribosome binding / ribosomal small subunit assembly / ribosomal small subunit biogenesis / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / cytoplasmic translation / tRNA binding / negative regulation of translation / rRNA binding / ribosome / structural constituent of ribosome / translation / response to antibiotic / mRNA binding / RNA binding / zinc ion binding / membrane / cytosol / cytoplasm 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 S14, bacterial/plastid / Ribosomal protein S21 superfamily / Ribosomal protein S21 / Ribosomal protein S16, conserved site / Ribosomal protein S16 signature. / Ribosomal protein S21 / Ribosomal protein S3, bacterial-type / Ribosomal protein S19, bacterial-type / Ribosomal protein S13, bacterial-type / Ribosomal protein S6, conserved site / Ribosomal protein S6 signature. / Ribosomal protein S7, bacterial/organellar-type / Ribosomal protein S9, bacterial/plastid / 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 S2, bacteria/mitochondria/plastid / Ribosomal protein S18, conserved site / Ribosomal protein S18 signature. / Ribosomal protein S16 / Ribosomal protein S16 domain superfamily / Ribosomal protein S16 / Ribosomal protein S15, bacterial-type / Ribosomal protein S6 / Ribosomal protein S6 / Ribosomal protein S6 superfamily / Ribosomal protein S12, bacterial-type / Translation elongation factor EF1B/ribosomal protein S6 / Ribosomal protein S18 / Ribosomal protein S18 / Ribosomal protein S18 superfamily / K Homology domain / K homology RNA-binding domain / Ribosomal protein S2 signature 2. / Ribosomal protein S10, conserved site / Ribosomal protein S10 signature. / Ribosomal protein S3, conserved site / Ribosomal protein S3 signature. / Ribosomal protein S14, conserved site / Ribosomal protein S14 signature. / Ribosomal protein S2 signature 1. / KH domain / Type-2 KH domain profile. / K Homology domain, type 2 / Ribosomal protein S3, C-terminal / Ribosomal protein S3, C-terminal domain / Ribosomal protein S3, C-terminal domain superfamily / Ribosomal protein S15/S19, conserved site / Ribosomal protein S19 signature. / Ribosomal protein S10 / Ribosomal protein S19/S15 / Ribosomal protein S19/S15, superfamily / Ribosomal protein S19 / : / Ribosomal protein S2, conserved site / Ribosomal protein S7, conserved site / Ribosomal protein S7 signature. / Ribosomal protein S5, N-terminal, conserved site / Ribosomal protein S5 signature. / Ribosomal protein S2 / Ribosomal protein S2, flavodoxin-like domain superfamily / Ribosomal protein S2 / Ribosomal protein S17, conserved site / Ribosomal protein S17 signature. / K homology domain superfamily, prokaryotic type / Ribosomal protein S5 / S5 double stranded RNA-binding domain profile. / Ribosomal protein S5, N-terminal / Ribosomal protein S5, N-terminal domain / Ribosomal protein S5, C-terminal / Ribosomal protein S13, conserved site / Ribosomal protein S13 signature. / Ribosomal protein S5, C-terminal domain / Ribosomal protein S13 / 30s ribosomal protein S13, C-terminal / Ribosomal protein S13/S18 / Ribosomal protein S13 family profile. / Ribosomal protein S8 signature. / Ribosomal protein S4/S9 N-terminal domain / Ribosomal protein S4, conserved site / Ribosomal protein S4 signature. / Ribosomal protein S4/S9 N-terminal domain / Ribosomal protein S4/S9, N-terminal / Ribosomal protein S14 Similarity search - Domain/homology
Translation initiation factor IF-3 / Small ribosomal subunit protein bS6 / Small ribosomal subunit protein uS7 / Small ribosomal subunit protein uS10 / Small ribosomal subunit protein uS11 / Small ribosomal subunit protein uS12 / Small ribosomal subunit protein uS13 / Small ribosomal subunit protein bS16 / Small ribosomal subunit protein bS18 / Small ribosomal subunit protein uS19 ...Translation initiation factor IF-3 / Small ribosomal subunit protein bS6 / Small ribosomal subunit protein uS7 / Small ribosomal subunit protein uS10 / Small ribosomal subunit protein uS11 / Small ribosomal subunit protein uS12 / Small ribosomal subunit protein uS13 / Small ribosomal subunit protein bS16 / Small ribosomal subunit protein bS18 / Small ribosomal subunit protein uS19 / Small ribosomal subunit protein bS20 / Small ribosomal subunit protein uS2 / Small ribosomal subunit protein uS3 / Small ribosomal subunit protein uS4 / Small ribosomal subunit protein uS5 / Small ribosomal subunit protein uS8 / Small ribosomal subunit protein uS9 / Small ribosomal subunit protein uS15 / Small ribosomal subunit protein uS14 / 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: 4.6 Å
Journal: Proteins / Year: 2025 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.
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Controller
Open data
Basic information
Map data
Sample
Keywords
Function and homology information
Escherichia coli (E. coli)
Authors
United Kingdom, 1 items 
Citation
Structure visualization
Downloads & links
emd_36619.png
http://ftp.pdbj.org/pub/emdb/structures/EMD-36619
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Processing
Electron microscopy
FIELD EMISSION GUN
