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A Ds insertion alters the nuclear localization of the maize transcriptional activator R.
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| Zeitschriftentitel: | Proceedings of the National Academy of Sciences |
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| Personen und Körperschaften: | , , |
| In: | Proceedings of the National Academy of Sciences, 93, 1996, 15, S. 7816-7820 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Proceedings of the National Academy of Sciences
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| Schlagwörter: |
| Zusammenfassung: | <jats:p>The R-sc gene of maize is a member of the R gene family of transcriptional activators that regulate anthocyanin biosynthesis. A derivative of R-sc, r-m9 conditions a reduced level of aleurone pigmentation due to the presence of a 2.1-kb Ds insertion near the 3' end of the coding region. Excision of Ds from r-m9 leaves a 7-bp insertion in the darker but still mutant v24 derivative. Both the 7-bp insertion in v24 and the 2.1-kb Ds in r-m9 are predicted to truncate their respective R proteins proximal to the carboxyl terminus, which was shown previously to contain one of three nuclear localization sequences. We find that the reduced expression of r-m9 and v24 are not due to mRNA or protein instability, but most likely reflect the inefficient localization of truncated R proteins to the nucleus. To our knowledge this is the first example of a transposable element insertion that alters gene expression by affecting nuclear localization. In addition, our data indicate that the carboxyl terminus of the R protein is far more important than previously suspected and illustrates the utility of natural mutations for defining functional domains in proteins.</jats:p> |
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| Umfang: | 7816-7820 |
| ISSN: |
0027-8424
1091-6490 |
| DOI: | 10.1073/pnas.93.15.7816 |