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| Content Provider | PubMed Central |
|---|---|
| Author | Nogi, Y. Fukasawa, T. |
| Abstract | To study the functional domains of a transcriptional repressor encoded by the GAL80 gene of Saccharomyces cerevisiae, we constructed various deletion and insertion mutations in the GAL80 coding region and determined the ability of these mutations to repress synthesis of galactose-metabolizing enzymes as well as the capacity of the mutant proteins to respond to the inducer. Two regions, from amino acids 1 to 321 and from amino acids 341 to 423, in the total sequence of 435 amino acids were required for repression. The internal region from amino acids 321 to 340 played a role in the response to the inducer. The 12 amino acids at the carboxy terminus were dispensable for normal functioning of the GAL80 protein. Using indirect immunofluorescence and subcellular fractionation techniques, we also found that two distinct regions (amino acids 1 to 109 and 342 to 405) within the putative repression domain were capable of directing cytoplasmically synthesized Escherichia coli beta-galactosidase to the yeast nucleus. In addition, three gal80 mutations were mapped at amino acid residues 183, 298, and 310 in the domain required for repression. On the basis of these results, we suggest that the GAL80 protein consists of a repression domain located in two separate regions (amino acid residues 1 to 321 and 341 to 423) that are interrupted by an inducer interaction domain (residues 322 to 340) and two nuclear localization domains (1 to 109 and 342 to 405) that overlap the repression domains. |
| Starting Page | 3009 |
| File Format | |
| ISSN | 10985549 |
| e-ISSN | 10985549 |
| Journal | Molecular and Cellular Biology |
| Issue Number | 7 |
| Volume Number | 9 |
| Language | English |
| Publisher Date | 1989-07-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology |
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