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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Jackson, B. M. Hinnebusch, A. G. Wek, R. C. |
| Description | Author Affiliation: Wek RC ( Unit on Molecular Genetics of Lower Eukaryotes, National Institute of Child Health and Human Development, Bethesda, MD 20892.); |
| Abstract | The GCN2 protein of Saccharomyces cerevisiae stimulates the expression of amino acid biosynthetic genes under conditions of amino acid starvation by derepressing GCN4, a transcriptional activator of these genes. GCN2 contains sequences homologous to the catalytic domain of protein kinases. We show here that substitution of a highly conserved lysine in the presumed ATP-binding site of this domain impairs the derepression of histidine biosynthetic genes under GCN4 control. This result supports the idea that protein kinase activity is required for GCN2 positive regulatory function. Determination of the nucleotide sequence of the entire GCN2 complementation unit, and measurement of the molecular weight of GCN2 protein expressed in vivo, indicate that GCN2 is a Mr approximately 180,000 protein and contains a Mr approximately 60,000 segment homologous to histidyl-tRNA synthetases (HisRSs) juxtaposed to the protein kinase domain. Several two-codon insertion mutations in the HisRS-related coding sequences inactivate GCN2 regulatory function. Based on these results, we propose that the GCN2 HisRS domain responds to the presence of uncharged tRNA by activating the adjacent protein kinase moiety, thus providing a means of coupling GCN2-mediated derepression of GCN4 expression to the availability of amino acids. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 12 |
| Volume Number | 86 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1989-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Amino Acids Metabolism Amino Acyl-tRNA Synthetases Genetics DNA-Binding Proteins Fungal Proteins Genes, Fungal Genes Histidine-tRNA Ligase Protein Kinases Saccharomyces Cerevisiae Proteins Saccharomyces Cerevisiae Transcription Factors Amino Acid Sequence Molecular Sequence Data Restriction Mapping Enzymology Sequence Homology, Nucleic Acid Comparative Study Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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