A yeast glutamine tRNA signals nitrogen status for regulation of dimorphic growth and sporulation
| Autor: | Richard A. Singer, Gerald C. Johnston, N. Rowley, Lois E. Murray, Ian W. Dawes |
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| Rok vydání: | 1998 |
| Předmět: |
Saccharomyces cerevisiae Proteins
Nitrogen Saccharomyces cerevisiae Fungal Proteins Pseudohyphal growth RNA Transfer Gln Protein biosynthesis Codon Fungal protein Budding Multidisciplinary Base Sequence biology Translation (biology) Biological Sciences Spores Fungal biology.organism_classification Yeast Biochemistry Protein Biosynthesis Calcium-Calmodulin-Dependent Protein Kinases Transfer RNA Nucleic Acid Conformation Signal Transduction Transcription Factors |
| Zdroj: | Proceedings of the National Academy of Sciences. 95:8619-8624 |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.95.15.8619 |
| Popis: | Dimorphic growth of the budding yeast Saccharomyces cerevisiae is regulated by the quality of the nitrogen supply. On a preferred nitrogen source diploid cells grow as ellipsoidal cells by using a bipolar pattern of budding, whereas on a poor nitrogen source a unipolar pattern of budding is adopted, resulting in extended pseudohyphal chains of filamentous cells. Here we report that the quality of the nitrogen source is signaled by the glutamine tRNA isoform with a 5′-CUG anticodon (tRNA CUG ). Mutations that alter this tRNA impair assessment of the nitrogen supply without measurably affecting protein synthesis, so that mutant cells display pseudohyphal growth even on a preferred nitrogen source. The nitrogen status for other nitrogen-responsive processes such as catabolic gene expression and sporulation also is signaled by this tRNA: mutant cells inappropriately induce the nitrogen-repressed gene CAR1 and undergo precocious sporulation in nitrogen-rich media. Therefore, in addition to its role in mRNA translation, this tRNA also transduces nitrogen signals that regulate development. |
| Databáze: | OpenAIRE |
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