SWI/SNF and RSC remodeler complexes bind to MBF-dependent genes

Abstract

In fission yeast, MBF-dependent transcription is required for cells to complete S phase. The MBF transcription factor is regulated through a complex feedback mechanism that involves the co-repressors Yox1 and Nrm1 that are loaded onto MBF at the end of S phase, while positive transactivation is achieved through the constitutive binding of the co-activator Rep2. Here we show that Rep2 is required to fully recruit the chromatin remodelers SWI/SNF and RSC to MBF-regulated promoters. On the contrary, Nrm1 and Yox1, when bound to the MBF complex, block the approximation of these chromatin remodelers to MBF-regulated promoters. We propose that SWI/SNF and RSC are recruited to MBF-regulated genes, and RSC together with SAGA complex are important to regulate the G1-to-S transcriptional wave. Mutants of these remodeler complexes are highly sensitive when cells are exposed to insults that challenge DNA synthesis.