The nucle(ol)ar Tif6p and Efl1p are required for a late cytoplasmic step of ribosome synthesis.
Deletion of elongation factor-like 1 (Efl1p), a cytoplasmic GTPase homologous to the ribosomal translocases EF-G/EF-2, results in nucle(ol)ar pre-rRNA processing and pre-60S subunits export defects. Efl1p interacts genetically with Tif6p, a nucle(ol)ar protein stably associated with pre-60S subunits and required for their synthesis and nuclear exit. In the absence of ... Efl1p, 50% of Tif6p is relocated to the cytoplasm. In vitro, the GTPase activity of Efl1p is stimulated by 60S, and Efl1p promotes the dissociation of Tif6p-60S complexes. We propose that Tif6p binds to the pre-60S subunits in the nucle(ol)us and escorts them to the cytoplasm where the GTPase activity of Efl1p triggers a late structural rearrangement, which facilitates the release of Tif6p and its recycling to the nucle(ol)us.
Mesh Terms:
Biological Transport, Cell Division, Cell Nucleolus, Cell Nucleus, Conserved Sequence, Cytoplasm, Enzyme Activation, GTP Phosphohydrolases, Gene Deletion, Genes, Reporter, Molecular Weight, Phenotype, Protein Subunits, RNA Precursors, RNA Processing, Post-Transcriptional, RNA, Fungal, RNA, Ribosomal, Ribosomes, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins
Biological Transport, Cell Division, Cell Nucleolus, Cell Nucleus, Conserved Sequence, Cytoplasm, Enzyme Activation, GTP Phosphohydrolases, Gene Deletion, Genes, Reporter, Molecular Weight, Phenotype, Protein Subunits, RNA Precursors, RNA Processing, Post-Transcriptional, RNA, Fungal, RNA, Ribosomal, Ribosomes, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins
Mol. Cell
Date: Dec. 01, 2001
PubMed ID: 11779510
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