Abstract
The products of c-fos and c-jun (Fos and Jun) function in gene regulation by interacting with the AP-1 binding site. Here we have examined the contribution of Fos and Jun toward transcriptional activity by using Fos and Jun polypeptides purified from Escherichia coli. Fos contained a transcriptional activation domain as well as a region which exerted a negative influence on transcriptional activity in vitro. Moreover, distinct activation domains in both Fos and Jun functioned cooperatively in transcriptional stimulation. Thus, regulation of gene expression by Fos and Jun results from an integration of several functional domains in a bimolecular complex.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Binding Sites
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Cell-Free System
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DNA-Binding Proteins / genetics*
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DNA-Binding Proteins / metabolism
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Gene Expression Regulation
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HeLa Cells
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Humans
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Macromolecular Substances
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Proto-Oncogene Proteins / genetics*
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Proto-Oncogene Proteins / metabolism
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Proto-Oncogene Proteins c-fos
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Proto-Oncogene Proteins c-jun
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Structure-Activity Relationship
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Transcription Factors / genetics*
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Transcription Factors / metabolism
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Transcription, Genetic
Substances
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DNA-Binding Proteins
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Macromolecular Substances
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Proto-Oncogene Proteins
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Proto-Oncogene Proteins c-fos
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Proto-Oncogene Proteins c-jun
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Transcription Factors