ArticlebioRxiv : the preprint server for biology2025
Molecular determinants of RNase MRP specificity and function.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors.
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Abstract
RNase MRP and RNase P are evolutionarily related complexes that facilitate rRNA and tRNA biogenesis, respectively. The two enzymes share nearly all protein subunits and have evolutionarily related catalytic RNAs. Notably, RNase P includes a unique subunit, Rpp21, whereas no RNase MRP-specific proteins have been found in humans, limiting molecular analyses of RNase MRP function. Here, we identify the RNase MRP-specific protein, C18orf21/RMRPP1. RMRPP1 and Rpp21 display significant structural homology, but we identify specific regions that drive interactions with their respective complexes. Additionally, we reveal that RNase MRP is required for 40S, but not 60S, ribosome biogenesis uncovering an alternative pathway for ribosome assembly. Finally, we identify Nepro as an essential rRNA processing factor that associates with the RNase MRP complex. Together, our findings elucidate the molecular determinants of RNase MRP function and underscore its critical role in ribosome biogenesis.
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