Structure of the nuclear exosome captured on a maturing preribosome
The RNA exosome captured in action - The RNA exosome, a major RNA degradation machine, processes ribosomal RNA (rRNA) precursors and is directly coupled to the protein synthesis machine, the ribosome. Using cryo-electron microscopy, Schuller et al. investigated the structure of the precursor large r...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
March 8, 2018
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| In: |
Science
Year: 2018, Volume: 360, Issue: 6385, Pages: 219-222 |
| ISSN: | 1095-9203 |
| DOI: | 10.1126/science.aar5428 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1126/science.aar5428 Verlag, Volltext: https://science.sciencemag.org/content/360/6385/219 
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| Author Notes: | Jan Michael Schuller, Sebastian Falk, Lisa Fromm, Ed Hurt, Elena Conti |
| Summary: | The RNA exosome captured in action - The RNA exosome, a major RNA degradation machine, processes ribosomal RNA (rRNA) precursors and is directly coupled to the protein synthesis machine, the ribosome. Using cryo-electron microscopy, Schuller et al. investigated the structure of the precursor large ribosomal subunit from yeast with unprocessed rRNA in complex with the RNA exosome. The structure captures a snapshot of two molecular machines transiently interacting and explains how the RNA exosome acts on an authentic physiological substrate and remodels the large subunit during ribosome maturation. - Science, this issue p. 219 - The RNA exosome complex processes and degrades a wide range of transcripts, including ribosomal RNAs (rRNAs). We used cryo-electron microscopy to visualize the yeast nuclear exosome holocomplex captured on a precursor large ribosomal subunit (pre-60S) during 7S-to-5.8S rRNA processing. The cofactors of the nuclear exosome are sandwiched between the ribonuclease core complex (Exo-10) and the remodeled “foot” structure of the pre-60S particle, which harbors the 5.8S rRNA precursor. The exosome-associated helicase Mtr4 recognizes the preribosomal substrate by docking to specific sites on the 25S rRNA, captures the 3′ extension of the 5.8S rRNA, and channels it toward Exo-10. The structure elucidates how the exosome forms a structural and functional unit together with its massive pre-60S substrate to process rRNA during ribosome maturation. - The exosome forms a single structural and functional unit with its preribosomal substrate to catalyze ribosomal RNA processing and ribosome maturation. - The exosome forms a single structural and functional unit with its preribosomal substrate to catalyze ribosomal RNA processing and ribosome maturation. |
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| Item Description: | Gesehen am 27.08.2019 |
| Physical Description: | Online Resource |
| ISSN: | 1095-9203 |
| DOI: | 10.1126/science.aar5428 |