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Sen34p depletion blocks tRNA splicing in vivo and delays rRNA processing.
- Source :
-
Biochemical and biophysical research communications [Biochem Biophys Res Commun] 2005 Nov 11; Vol. 337 (1), pp. 89-94. - Publication Year :
- 2005
-
Abstract
- Tif6p (eIF6) is necessary for 60S biogenesis, rRNA maturation and must be released from 60S to permit 80S assembly and translation. We characterized Tif6p interactors. Tif6p is mostly on 66S-60S pre-ribosomes, partly free. Tif6p complex(es) contain nucleo-ribosomal factors and Asc1p. Surprisingly, Tif6p particle contains the low-abundance endonuclease Sen34p. We analyzed Sen34p role on rRNA/tRNA synthesis, in vivo. Sen34p depletion impairs tRNA splicing and causes unexpected 80S accumulation. Accordingly, Sen34p overexpression causes 80S decrease and increased polysomes which suggest increased translational efficiency. With delayed kinetics, Sen34p depletion impairs rRNA processing. We conclude that Sen34p is absolutely required for tRNA splicing and that it is a rate-limiting element for efficient translation. Finally, we confirm that Tif6p accompanies 27S pre-rRNA maturation to 25S rRNA and we suggest that Sen34p endonuclease in Tif6p complex may affect also rRNA maturation.
- Subjects :
- Carrier Proteins metabolism
Endoribonucleases antagonists & inhibitors
Endoribonucleases genetics
Gene Deletion
Gene Expression Regulation, Fungal
Intermediate Filament Proteins metabolism
Kinetics
Phosphoproteins metabolism
RNA Precursors metabolism
RNA, Transfer biosynthesis
Ribosomal Proteins
Saccharomyces cerevisiae metabolism
Saccharomyces cerevisiae Proteins antagonists & inhibitors
Saccharomyces cerevisiae Proteins genetics
Saccharomyces cerevisiae Proteins metabolism
Endoribonucleases physiology
RNA Processing, Post-Transcriptional
RNA Splicing
RNA, Ribosomal metabolism
RNA, Transfer metabolism
Saccharomyces cerevisiae genetics
Saccharomyces cerevisiae Proteins physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0006-291X
- Volume :
- 337
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Biochemical and biophysical research communications
- Publication Type :
- Academic Journal
- Accession number :
- 16188229
- Full Text :
- https://doi.org/10.1016/j.bbrc.2005.09.012