Portal de Periódicos da CAPES

Protein trans -Acting Factors Involved in Ribosome Biogenesis in Saccharomyces cerevisiae

1999; Taylor & Francis; Volume: 19; Issue: 12 Linguagem: Inglês

10.1128/mcb.19.12.7897

1098-5549

Dieter Kressler, Patrick Linder, Jesús de la Cruz,

Plant Disease Resistance and Genetics

The synthesis of ribosomes is one of the major cellular activities, and in eukaryotes, it takes place primarily, although not exclusively, in a specialized subnuclear compartment termed the nucleolus (125, 155). There, the rRNA genes are transcribed as precursors (pre-rRNAs), which undergo processing and covalent modification. Maturation of pre-rRNAs is intimately linked to their assembly with the ribosomal proteins (r-proteins). These processes depend on various cis-acting elements (6, 188), and they require a large number of nonribosomal protein trans-acting factors (97, 174, 193). Experimental evidence suggests that the basic outline of ribosome synthesis is conserved throughout eukaryotes. However, most of our knowledge comes from the combination of molecular genetic and biochemical approaches in the yeast Saccharomyces cerevisiae. This minireview is aimed at giving an insight into the functions of the many protein trans-acting factors involved in ribosome biogenesis in S. cerevisiae.