title: Genome-wide investigation of the role of the tRNA nuclear-cytoplasmic trafficking pathway in regulation of the yeast Saccharomyces cerevisiae transcriptome and proteome.
abstract: In eukaryotic cells, tRNAs are transcribed and partially processed in the nucleus before they are exported to the cytoplasm, where they have an essential role in protein synthesis. Surprisingly, mature cytoplasmic tRNAs shuttle between nucleus and cytoplasm, and tRNA subcellular distribution is nutrient dependent. At least three members of the β-importin family, Los1, Mtr10, and Msn5, function in tRNA nuclear-cytoplasmic intracellular movement. To test the hypothesis that the tRNA retrograde pathway regulates the translation of particular transcripts, we compared the expression profiles from nontranslating mRNAs and polyribosome-associated translating mRNAs collected from msn5Δ, mtr10Δ, and wild-type cells under fed or acute amino acid depletion conditions. Our microarray data revealed that the methionine, arginine, and leucine biosynthesis pathways are targets of the tRNA retrograde process. We confirmed the microarray data by Northern and Western blot analyses. The levels of some of the particular target mRNAs were reduced, while others appeared not to be affected. However, the protein levels of all tested targets in these pathways were greatly decreased when tRNA nuclear import or reexport to the cytoplasm was disrupted. This study provides information that tRNA nuclear-cytoplasmic dynamics is connected to the biogenesis of proteins involved in amino acid biosynthesis.
authors: Department of Molecular Genetics.
authors: Hui-Yi
authors: HY
authors: Chu
authors: Anita K
authors: AK
authors: Hopper
mesh_terms: D021581:Active Transport, Cell Nucleus; D000596:Amino Acids / Q000096:biosynthesis; D002467:Cell Nucleus / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D015536:Down-Regulation; D028884:Karyopherins / Q000235:genetics / Q000378:metabolism; D029543:Nucleocytoplasmic Transport Proteins / Q000502:physiology; D020411:Oligonucleotide Array Sequence Analysis; D011132:Polyribosomes / Q000235:genetics / Q000378:metabolism; D014176:Protein Biosynthesis; D020543:Proteome / Q000235:genetics / Q000378:metabolism*; D034443:RNA Transport; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012343:RNA, Transfer / Q000235:genetics / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000502:physiology; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D059467:Transcriptome; D028961:beta Karyopherins / Q000502:physiology
chemical_list: D000596:Amino Acids; D028884:Karyopherins; C401306:MSN5 protein, S cerevisiae; C110033:MTR10 protein, S cerevisiae; D029543:Nucleocytoplasmic Transport Proteins; D020543:Proteome; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D029701:Saccharomyces cerevisiae Proteins; D028961:beta Karyopherins; D012343:RNA, Transfer
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