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  • Title: Detection of an altered heterochromatin structure in the absence of the nucleotide excision repair protein Rad4 in Saccharomyces cerevisiae.
    Author: Zhang L, Chen H, Bi X, Gong F.
    Journal: Cell Cycle; 2013 Aug 01; 12(15):2435-42. PubMed ID: 23839037.
    Abstract:
    Rad4p is a DNA damage recognition protein essential for global genomic nucleotide excision repair in Saccharomyces cerevisiae. Here, we show that Rad4p binds to the heterochromatic HML locus. In a yeast mutant lacking Rad4p, an increased level of SIR complex binding at the HML locus is accompanied by an altered, more compact heterochromatin structure, as revealed by a topological analysis of chromatin circles released from the locus. In addition, gene silencing at the HML locus is enhanced in the rad4Δ mutant. Importantly, re-expression of Rad4p in the rad4Δ mutant restores the altered heterochromatin structure to a conformation similar to that detected in wild-type cells. These findings reveal a novel role of Rad4p in the regulation of heterochromatin structure and gene silencing.
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