The Terminal Extensions of Dbp7 Influence Growth and 60S Ribosomal Subunit Biogenesis in Saccharomyces cerevisiae
2023
Contreras Fernández, Julia Mª | Ruiz Blanco, Óscar | Dominique, Carine | Humbert, Odile | Henry, Yves | Henras, Anthony K. | Cruz Díaz, Jesús de la | Villalobo Polo, Eduardo | Universidad de Sevilla. Departamento de Genética | Universidad de Sevilla. Departamento de Microbiología | Ministerio de Ciencia e Innovación (MICIN). España | Junta de Andalucía | Universidad de Sevilla
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.
Show more [+] Less [-]Ministerio de Ciencia e Innovación PID2019-103850-GB-I00
Show more [+] Less [-]Junta de Andalucía P20_00581, BIO-271, BIO-210
Show more [+] Less [-]Universidad de Sevilla US-1380394
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