Abstract：
:Fos protein can trans-activate AP-1-dependent gene expression and trans-repress the c-fos promoter. Although we find that trans-repression is enhanced by coexpression of c-Jun, it does not require any of the AP-1 or ATF sites in the mouse c-fos promoter. A major target for repression is the serum response element (SRE). Fos mutants with an impaired leucine zipper are defective in trans-repression and transformation, suggesting that these functions involve the formation of Fos protein complexes. In contrast, mutations that abolish DNA binding of Fos enhance trans-repression but destroy the transforming potential of Fos. In addition, v-Fos protein efficiently transforms but is unable to trans-repress. These findings point to different mechanisms involved in trans-activation and trans-repression and suggest that trans-repression of the type described here is neither sufficient nor required for Fos-induced transformation.
journal_name
Celljournal_title
Cellauthors
Lucibello FC,Lowag C,Neuberg M,Müller Rdoi
10.1016/0092-8674(89)90756-3subject
Has Abstractpub_date
1989-12-22 00:00:00pages
999-1007issue
6eissn
0092-8674issn
1097-4172pii
0092-8674(89)90756-3journal_volume
59pub_type
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