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Título: | The Terminal Extensions of Dbp7 Influence Growth and 60S Ribosomal Subunit Biogenesis in Saccharomyces cerevisiae |
Autor: | Contreras, Julia CSIC; Ruiz-Blanco, Óscar; Dominique, Carine; Humbert, Odile; Henry, Yves; Henras, Anthony K.; Cruz, Jesús de la CSIC ORCID; Villalobo, Eduardo CSIC ORCID | Palabras clave: | 60S ribosomal subunit DEAD-box protein Dbp7 RNA helicase Saccharomyces cerevisiae Ribosome Ribosome assembly factor |
Fecha de publicación: | 9-feb-2023 | Editor: | Multidisciplinary Digital Publishing Institute | Citación: | International Journal of Molecular Sciences 24(4): 3460 (2023) | Resumen: | Ribosome synthesis is a complex process that involves a large set of protein trans-acting factors, among them DEx(D/H)-box helicases. These are enzymes that carry out remodelling activities onto RNAs by hydrolysing ATP. The nucleolar DEGD-box protein Dbp7 is required for the biogenesis of large 60S ribosomal subunits. Recently, we have shown that Dbp7 is an RNA helicase that regulates the dynamic base-pairing between the snR190 small nucleolar RNA and the precursors of the ribosomal RNA within early pre-60S ribosomal particles. As the rest of DEx(D/H)-box proteins, Dbp7 has a modular organization formed by a helicase core region, which contains conserved motifs, and variable, non-conserved N- and C-terminal extensions. The role of these extensions remains unknown. Herein, we show that the N-terminal domain of Dbp7 is necessary for efficient nuclear import of the protein. Indeed, a basic bipartite nuclear localization signal (NLS) could be identified in its N-terminal domain. Removal of this putative NLS impairs, but does not abolish, Dbp7 nuclear import. Both N- and C-terminal domains are required for normal growth and 60S ribosomal subunit synthesis. Furthermore, we have studied the role of these domains in the association of Dbp7 with pre-ribosomal particles. Altogether, our results show that the N- and C-terminal domains of Dbp7 are important for the optimal function of this protein during ribosome biogenesis. | Versión del editor: | https://doi.org/10.3390/ijms24043460 | URI: | http://hdl.handle.net/10261/340213 | DOI: | 10.3390/ijms24043460 | ISSN: | 1661-6596 | E-ISSN: | 1422-0067 |
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