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• W3138437701 abstract "Abstract RNA helicases play important roles in diverse aspects of RNA metabolism through their functions in remodelling ribonucleoprotein complexes (RNPs), such as pre-ribosomes. Here, we show that the DEAD box helicase Dbp3 is required for efficient processing of the U18 and U24 intron-encoded snoRNAs and 2′-O-methylation of various sites within the 25S ribosomal RNA (rRNA) sequence. Furthermore, numerous box C/D snoRNPs accumulate on pre-ribosomes in the absence of Dbp3. Many snoRNAs guiding Dbp3-dependent rRNA modifications have overlapping pre-rRNA basepairing sites and therefore form mutually exclusive interactions with pre-ribosomes. Analysis of the distribution of these snoRNAs between pre-ribosome-associated and ‘free’ pools demonstrated that many are almost exclusively associated with pre-ribosomal complexes. Our data suggest that retention of such snoRNPs on pre-ribosomes when Dbp3 is lacking may impede rRNA 2′-O-methylation by reducing the recycling efficiency of snoRNPs and by inhibiting snoRNP access to proximal target sites. The observation of substoichiometric rRNA modification at adjacent sites suggests that the snoRNPs guiding such modifications likely interact stochastically rather than hierarchically with their pre-rRNA target sites. Together, our data provide new insights into the dynamics of snoRNPs on pre-ribosomal complexes and the remodelling events occurring during the early stages of ribosome assembly." @default.
• W3138437701 created "2021-03-29" @default.
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• W3138437701 date "2021-03-15" @default.
• W3138437701 modified "2023-10-16" @default.
• W3138437701 title "RNA helicase-mediated regulation of snoRNP dynamics on pre-ribosomes and rRNA 2′-<i>O</i>-methylation" @default.
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• W3138437701 doi "https://doi.org/10.1093/nar/gkab159" @default.
• W3138437701 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8053091" @default.
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