Cell
Volume 64, Issue 4, 22 February 1991, Pages 751-759
Journal home page for Cell

Article
A naturally occurring truncated form of FosB that inhibits Fos/Jun transcriptional activity

https://doi.org/10.1016/0092-8674(91)90504-RGet rights and content

Abstract

Fos and Jun transcription factors are induced by a variety of extracellular signaling agents. We describe here an unusual member of the Fos family that is also induced, namely, a truncated form of FosB (ΔFosB) missing the C-terminal 101 amino acids of FosB. ΔFosB retains the dimerization and DNA-binding activities of FosB but has lost the ability in transfection assays to activate a promoter with an AP-1 site and to repress the c-fos promoter. Rather, ΔFosB inhibits gene activation by Jun or Jun + Fos and inhibits repression of the c-fos promoter by FosB or c-Fos, presumably by competing with full-length Fos proteins at the steps of dimerization with Jun and binding to DNA. In stimulated cells ΔFosB may act to limit the transcriptional effects of Fos and Jun proteins.

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