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Mol Cell Biol. 1994 Jun; 14(6): 4002–4010.
doi: 10.1128/mcb.14.6.4002
PMCID: PMC358766
PMID: 8196639

Nucleosomal location of the STE6 TATA box and Mat alpha 2p-mediated repression.

H G Patterton and R T Simpson
Author information Copyright and License information PMC Disclaimer

Abstract

It has been proposed that yeast MATa cell-specific genes are repressed in MAT alpha cells by the Mat alpha 2p repressor-directed placement of a nucleosome in a position that incorporates the TATA box of the MATa-specific gene close to the nucleosomal pseudodyad. In this study, we address this proposal directly with a series of plasmids designed to place the MATa-specific STE6 TATA box at different locations in a nucleosome and in the internucleosomal linker. These plasmids contain different lengths of synthetic random DNA between the Mat alpha 2p operator and the TATA box of the STE6 promoter, which is located upstream of a lacZ reporter gene in a multicopy plasmid. We show that in MAT alpha cells, a nucleosome is retained in an identical translational frame relative to the Mat alpha 2p operator in all the constructs investigated, irrespective of the sequence of the DNA wrapped onto the histone octamer. This result shows that the nucleosomal organization of the STE6 promoter in MAT alpha cells is not conferred by the sequence of the promoter itself. No expression of the lacZ reporter gene was detectable in MAT alpha cells in any of the constructs, even with the TATA box located in a short internucleosomal linker. These data indicate that repression of MATa-specific genes in MAT alpha cells does not require the precise translational placement of the TATA box close to the nucleosomal pseudodyad; the gene remains repressed when the TATA box is located within the investigated 250-bp region in the organized chromatin domain abutting the Mat alpha 2p operator in MAT alpha cells and may remain repressed with the TATA box located anywhere within this organized repression domain.

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Selected References

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