An assembly of functioning ribosomes starts with the biosynthesis of ribosomal RNAs and proteins. In all living species, polycistronic pre-ribosomal RNA (pre-rRNA) is processed to mature rRNAs and is covalently modified at multiple positions, with the aid of specific protein enzymes and small nucleolar guide RNAs (snoRNAs). There are more than 40 known types of covalent rRNA modifications, the two most common ones being pseudouridylation and methylation (Crain et al. 2003). Ribosomal proteins, some of which are also covalently modified, are then assembled into mature ribosome subunits with rRNA. In eukaryotic cells, cytoplasmically synthesized ribosomal proteins have to be imported into the nucleus, and the assembled ribosomes are exported from the nucleus back into the cytoplasm.
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Mushegian, A. (2008). Evolution and Function of Processosome, the Complex That Assembles Ribosomes in Eukaryotes: Clues from Comparative Sequence Analysis. In: Bujnicki, J.M. (eds) Practical Bioinformatics. Nucleic Acids and Molecular Biology, vol 15. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-74268-5_9
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