NDLI: The role of zinc fingers in transcriptional activation by transcription factor IIIA.

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The role of zinc fingers in transcriptional activation by transcription factor IIIA.

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The role of zinc fingers in transcriptional activation by transcription factor IIIA.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Del Rio, S. Setzer, D. R.
Description	Author Affiliation: Del Rio S ( Department of Molecular Biology and Microbiology, Case Western Reserve University, School of Medicine, Cleveland, OH 44106.);
Abstract	We have described elsewhere a number of the properties of a set of mutant forms of Xenopus transcription factor IIIA (TFIIIA) containing single amino acid substitutions that result in the structural disruption of individual zinc finger domains. These 'broken finger' proteins have now been analyzed with respect to their ability to support transcription of 5S rRNA genes in vitro. Disruption of any one of the first six zinc fingers of TFIIIA has no discernible effect on the activity of the protein in supporting 5S rRNA synthesis in standard in vitro transcription assays, despite the fact that some of these mutant proteins exhibit large decreases in their binding affinity for 5S rRNA genes in binary complexes. These results indicate that the activity of TFIIIA as a transcription factor can be largely independent of its equilibrium binding constant for the 5S rRNA gene in the absence of other components of the RNA polymerase III transcriptional apparatus. In fact, this finding is consistent with the known pathway and kinetics of assembly of 5S rRNA transcription complexes. In contrast to the results obtained with finger 1-6 mutants, analogous mutations in zinc fingers 7-9 of TFIIIA result in moderate to complete loss of transcriptional activity. We interpret these results to mean that the three C-terminal zinc fingers of TFIIIA are not only involved in binding to the internal control region of 5S rRNA genes but are also required, either directly or indirectly, for higher-order interactions that are important in transcription complex assembly, stability, or activity.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	1
Volume Number	90
Language	English
Publisher	National Academy of Sciences
Publisher Date	1993-02-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	DNA, Ribosomal Genetics RNA, Ribosomal, 5S Biosynthesis Transcription Factors Metabolism Transcription, Genetic Zinc Fingers Physiology Animals Cloning, Molecular Escherichia Coli Kinetics Recombinant Proteins Transcription Factor TFIIIA Xenopus Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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