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Mol. Cell. Biol., Feb 1997, 545-552, Vol 17, No. 2
MS Spector, A Raff, H DeSilva, K Lee and MA Osley
The HIR/HPC (histone regulation/histone periodic control) negative
regulators play important roles in the transcription of six of the eight
core histone genes during the Saccharomyces cerevisiae cell cycle. The
phenotypes of hir1 and hir2 mutants suggested that the wild- type HIR1 and
HIR2 genes encode transcriptional repressors that function in the absence
of direct DNA binding. When Hir1p and Hir2p were artificially tethered to
yeast promoters, each protein repressed transcription, suggesting that they
represent a new class of transcriptional corepressors. The two proteins
might function as a complex in vivo: Hir2p required both Hir1p and another
Hir protein, Hir3p, to repress transcription when it was tethered to an
HTA1-lacZ reporter gene, and Hir1p and Hir2p could be coimmunoprecipitated
from yeast cell extracts. Tethered Hir1p also directed the periodic
transcription of the HTA1 gene and repressed HTA1 transcription in response
to two cell cycle regulatory signals. Thus, it represents the first example
of a transcriptional corepressor with a direct role in cell cycle-regulated
transcription.
Copyright © 1997, American Society for Microbiology
Hir1p and Hir2p function as transcriptional corepressors to regulate histone gene transcription in the Saccharomyces cerevisiae cell cycle
Program in Molecular Biology, Sloan Kettering Cancer Center, New York, New York 10021, USA.
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