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Mol. Cell. Biol., 10 1996, 5346-5357, Vol 16, No. 10
Copyright © 1996, American Society for Microbiology

The human cut homeodomain protein can repress gene expression by two distinct mechanisms: active repression and competition for binding site occupancy

F Mailly, G Berube, R Harada, PL Mao, S Phillips and A Nepveu
Department of Medicine, McGill University, Royal Victoria Hospital, Montreal, Quebec, Canada.

By analogy with other homeodomain proteins conserved in evolution, mammalian Cut proteins are believed, as in Drosophila melanogaster, to play an important role in determining cell type specificity in several tissues. At the molecular level, Cut proteins appear to serve as transcriptional repressors. In this study, we have examined the mechanism by which the human Cut (hCut) protein down-regulates gene expression. The homeodomain and the three regions called Cut repeats are evolutionarily conserved and were previously shown to function as DNA binding domains. The carboxy-terminal region, although it does not show amino acid sequence homology per se, in all cases is enriched in alanine and proline residues, a distinctive feature of some transcriptional repression domains. Our results reveal two distinct modes of repression: competition for binding site occupancy and active repression. On one hand, the composite DNA binding domain formed by Cut repeat 3 and the Cut homeodomain was shown to bind to CCAAT and Sp1 sites within the tk gene promoter and to reduce gene expression, presumably by preventing activation by the corresponding transcription factors. On the other hand, the carboxy-terminal region of mammalian Cut proteins was found to function as an active repression domain in a distance-independent manner. We have further narrowed this activity to two subdomains that can independently repress activated transcription. Finally, we present a model to illustrate the two mechanisms by which Cut proteins repress gene expression.


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