Reactome | 18SE pre-rRNA in pre-40S particles is nucleolytically processed during translocation from the nucleus to the cytosol

18SE pre-rRNA in pre-40S particles is nucleolytically processed during translocation from the nucleus to the cytosol

Stable Identifier

R-HSA-6791223

Type

Reaction [omitted]

Species

Homo sapiens

Compartment

cytosol, nucleoplasm

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18SE pre-rRNA in pre-40S particles is nucleolytically processed during translocation from the nucleus to the cytosol

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Exonuclease activity of the exosome (Preti et al. 2013) and endonuclease activity of NOB1 (inferred from yeast, Pertschy et al. 2009) process the 3' end of precursor rRNA (pre-rRNA) 18SE to yield mature 18S rRNA. During the processing, pre-rRNA 18SE is bound in the pre-40S ribosome subunit, which contains ribosomal proteins and processing factors such as NOB1 and BYSL. The pre-40S subunit is exported from the nucleus to the cytosol where processing factors are released and recycled back to the nucleus. The kinases RIOK1, RIOK2, CSNK1D and CSNK1E are associated with the pre-40S rRNA subunit in both the nucleus and cytosol and their kinase activity is required for recycling of processing factors back to the nucleus (Zemp et al. 2009, Zemp et al. 2014). RIOK1 and RIOK2 are also required for 18SE processing (Widmann et al. 2012, Zemp et al. 2009). RIOK3 (RIO3) is a cytosolic kinase that associates with the pre-40S ribosomal particle after export from the nucleus and is required for release of processing factors (Baumas et al. 2012).

Literature References

PubMed ID	Title	Journal	Year
22072790	The kinase activity of human Rio1 is required for final steps of cytoplasmic maturation of 40S subunits Widmann, B, Pfannstiel, J, Badertscher, L, Wandrey, F, Wyler, E, Zemp, I, Kutay, U	Mol. Biol. Cell	2012
19801658	RNA helicase Prp43 and its co-factor Pfa1 promote 20 to 18 S rRNA processing catalyzed by the endonuclease Nob1 Tollervey, D, Gnädig, M, Schneider, C, Hurt, E, Pertschy, B, Schäfer, T	J. Biol. Chem.	2009
16037817	Nuclear export and cytoplasmic processing of precursors to the 40S ribosomal subunits in mammalian cells Rouquette, J, Choesmel, V, Gleizes, PE	EMBO J.	2005
20805244	Analysis of two human pre-ribosomal factors, bystin and hTsr1, highlights differences in evolution of ribosome biogenesis between yeast and mammals O'Donohue, MF, Carron, C, Faubladier, M, Choesmel, V, Gleizes, PE	Nucleic Acids Res.	2011
19564402	Distinct cytoplasmic maturation steps of 40S ribosomal subunit precursors require hRio2 Widmann, B, Wild, T, O'Donohue, MF, Wandrey, F, Zemp, I, Kutay, U, Gleizes, PE	J. Cell Biol.	2009
25525153	WBSCR22/Merm1 is required for late nuclear pre-ribosomal RNA processing and mediates N7-methylation of G1639 in human 18S rRNA Haag, S, Kretschmer, J, Bohnsack, MT	RNA	2015
23482395	Gradual processing of the ITS1 from the nucleolus to the cytoplasm during synthesis of the human 18S rRNA Preti, M, O'Donohue, MF, Bortolin-Cavaillé, ML, Choesmel, V, Gleizes, PE, Montel-Lehry, N	Nucleic Acids Res.	2013
21097556	Tandem affinity purification combined with inducible shRNA expression as a tool to study the maturation of macromolecular assemblies Widmann, B, Gstaiger, M, Pfannstiel, J, Zimmermann, M, Wyler, E, Zemp, I, Kutay, U	RNA	2011
24424021	CK1δ and CK1ε are components of human 40S subunit precursors required for cytoplasmic 40S maturation Ashiono, C, Montellese, C, Wandrey, F, Wyler, E, Zemp, I, Kutay, U, Rao, S	J. Cell. Sci.	2014