Linked Life Data

10455183

Source:http://linkedlifedata.com/resource/pubmed/id/10455183

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pubmed-article:10455183pubmed:abstractTextTranscriptional activators Staf and Oct-1 play critical roles in the activation of small nuclear RNA (snRNA) and snRNA-type gene transcription. Recently, we established that Staf binding to the human U6 snRNA (hU6) and Xenopus selenocysteine tRNA (xtRNA(Sec)) genes requires different sets of the seven C2-H2 zinc fingers. In this work, using a combination of oocyte microinjection, electrophoretic mobility shift assays, and missing nucleoside experiments with wild-type and mutant promoters, we demonstrate that the hU6 gene requires zinc fingers 2-7 for Staf binding and Oct-1 for maximal transcriptional activity. In contrast, the xtRNA(Sec) gene needs the binding of the seven Staf zinc fingers, but not Oct-1, for optimal transcriptional capacity. Mutation in the binding site for Staf zinc finger 1 in the tRNA(Sec) promoter reduced both Staf binding and transcriptional activity. Conversely, introduction of a zinc finger 1 binding site in the hU6 promoter increased Staf binding but interfered with the simultaneous Staf and Oct-1 binding, thus reducing transcriptional activity. Collectively, these results show that the differential utilization of Staf zinc finger 1 represents a new, critical determinant of the transcriptional activation mechanism for the Xenopus tRNA(Sec) and human U6 snRNA genes.lld:pubmed
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pubmed-article:10455183pubmed:articleTitleMaximization of selenocysteine tRNA and U6 small nuclear RNA transcriptional activation achieved by flexible utilization of a Staf zinc finger.lld:pubmed
pubmed-article:10455183pubmed:affiliation"Structure des Macromolécules Biologiques et Mécanismes de Reconnaissance," UPR 9002 du CNRS, Institut de Biologie Moléculaire et Cellulaire, 15 rue René Descartes, 67084 Strasbourg Cedex, France.lld:pubmed
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pubmed-article:10455183pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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