Sanz AB, Garcia R, Rodriguez-Pena JM, Diez-Muniz S, Nombela C, Peterson CL, Arroyo J

Departamento de Microbiologia II, Facultad de Farmacia, Universidad Complutense de Madrid, IRYCIS, 28040 Madrid, Spain Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA, USA.

In Saccharomyces cerevisiae, the transcriptional program triggered by cell wall stress is coordinated by Slt2/Mpk1, the mitogen-activated protein kinase (MAPK) of the Cell Wall Integrity (CWI) pathway, and is mostly mediated by the transcription factor Rlm1. Here we show that the SWI/SNF chromatin remodeling complex plays a critical role in orchestrating the transcriptional response regulated by Rlm1. swi/snf mutants show drastically reduced expression of cell wall-stress responsive genes and hypersensitivity to cell wall interfering compounds. On stress, binding of RNA Pol II to the promoters of these genes depends on Rlm1, Slt2 and SWI/SNF. Rlm1 physically interacts with SWI/SNF to direct its association to target promoters. Finally, we observe nucleosome displacement at the CWI-responsive gene MLP1/KDX1 that relies on the SWI/SNF complex. Together, our results identify the SWI/SNF complex as a key element of the CWI MAPK pathway that mediates the chromatin remodeling necessary for an adequate transcriptional response to cell wall stress.

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