Small ribosomal subunit protein eS17 / Small ribosomal subunit protein uS2 / Small ribosomal subunit protein uS5 / Small ribosomal subunit protein uS3 / Small ribosomal subunit protein eS12 / Small ribosomal subunit protein eS19 / Small ribosomal subunit protein eS27 / Small ribosomal subunit protein uS4 / Small ribosomal subunit protein uS7 / Small ribosomal subunit protein eS10 ...Small ribosomal subunit protein eS17 / Small ribosomal subunit protein uS2 / Small ribosomal subunit protein uS5 / Small ribosomal subunit protein uS3 / Small ribosomal subunit protein eS12 / Small ribosomal subunit protein eS19 / Small ribosomal subunit protein eS27 / Small ribosomal subunit protein uS4 / Small ribosomal subunit protein uS7 / Small ribosomal subunit protein eS10 / Small ribosomal subunit protein uS10 / Small ribosomal subunit protein eS1 / Small ribosomal subunit protein eS7 / Small ribosomal subunit protein eS8 / Small ribosomal subunit protein uS8 / Small ribosomal subunit protein uS9 / Small ribosomal subunit protein uS11 / Small ribosomal subunit protein uS12 / Small ribosomal subunit protein uS13 / Small ribosomal subunit protein uS14 / Small ribosomal subunit protein uS15 / Small ribosomal subunit protein uS17 / Small ribosomal subunit protein eS4, X isoform / Small ribosomal subunit protein eS6 / Small ribosomal subunit protein uS19 / Small ribosomal subunit protein eS24 / Small ribosomal subunit protein eS25 / Small ribosomal subunit protein eS26 / Small ribosomal subunit protein eS28 / Ubiquitin-like FUBI-ribosomal protein eS30 fusion protein / Small ribosomal subunit protein eS32 / Ubiquitin-ribosomal protein eS31 fusion protein / Small ribosomal subunit protein eS21 / Small ribosomal subunit protein RACK1 / Exosome complex component RRP45 / Exosome complex component RRP4 / Exosome complex component RRP42 / Superkiller complex protein 2 / Exosome complex component MTR3 / Superkiller complex protein 3 / DIS3-like exonuclease 1 / Exosome complex component RRP43 / Superkiller complex protein 8 / Exosome complex component RRP41 / Exosome complex component RRP46 / Exosome complex component RRP40 / Exosome complex component CSL4 / HBS1-like protein Similarity search - Component
Biological species
Homo sapiens (human) / Cricket paralysis virus
Method
single particle reconstruction / cryo EM / Resolution: 3.4 Å
Journal: Nature / Year: 2024 Title: Structural basis of mRNA decay by the human exosome-ribosome supercomplex. Authors: Alexander Kögel / Achim Keidel / Matina-Jasemi Loukeri / Christopher C Kuhn / Lukas M Langer / Ingmar B Schäfer / Elena Conti / Abstract: The interplay between translation and mRNA decay is widespread in human cells. In quality-control pathways, exonucleolytic degradation of mRNA associated with translating ribosomes is mediated ...The interplay between translation and mRNA decay is widespread in human cells. In quality-control pathways, exonucleolytic degradation of mRNA associated with translating ribosomes is mediated largely by the cytoplasmic exosome, which includes the exoribonuclease complex EXO10 and the helicase complex SKI238 (refs. ). The helicase can extract mRNA from the ribosome and is expected to transfer it to the exoribonuclease core through a bridging factor, HBS1L3 (also known as SKI7), but the mechanisms of this molecular handover remain unclear. Here we reveal how human EXO10 is recruited by HBS1L3 (SKI7) to an active ribosome-bound SKI238 complex. We show that rather than a sequential handover, a direct physical coupling mechanism takes place, which culminates in the formation of a cytoplasmic exosome-ribosome supercomplex. Capturing the structure during active decay reveals a continuous path in which an RNA substrate threads from the 80S ribosome through the SKI2 helicase into the exoribonuclease active site of the cytoplasmic exosome complex. The SKI3 subunit of the complex directly binds to HBS1L3 (SKI7) and also engages a surface of the 40S subunit, establishing a recognition platform in collided disomes. Exosome and ribosome thus work together as a single structural and functional unit in co-translational mRNA decay, coordinating their activities in a transient supercomplex.
Name: Helicase SKI2W / type: protein_or_peptide / ID: 9 / Number of copies: 1 / Enantiomer: LEVO EC number: Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement
Name: Isoform 2 of HBS1-like protein / type: protein_or_peptide / ID: 10 / Number of copies: 1 / Enantiomer: LEVO EC number: Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement
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