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Maf1 is a repressor of RNA polymerase (Pol) III transcription for tRNA. Nutrient deprivation and environmental stress repress Pol III transcription through Maf1 in Saccharomyces cerevisiae. The sole Candida albicans homolog CaMaf1 is a protein of 380 amino acids with conserved domains and motifs of the eukaryotic Maf1 family. Here, we show that C. albicans cells lacking CaMAF1 show elevated levels of tRNA. Deletion of CaMAF1 increases the sensitivity of C. albicans cells to lithium cation and SDS as well as tolerance to rapamycin and azole. In addition, deletion of CaMAF1 reduces the level of filamentation and alters the surface morphology of colonies. CaMaf1 is localized in the nucleus of log-phase growing cells. However, a dynamic change of subcellular localization of CaMaf1 exists during serum-induced morphological transition, with CaMaf1 being localized in the nuclei of cells with germ tubes and short filaments but outside of the nuclei of cells with long filaments. In addition, CaMaf1 is required for rapamycin-induced repression of CaERG20, encoding the farnesyl pyrophosphate synthetase involved in ergosterol biosynthesis. Therefore, CaMaf1 plays a role as a general repressor of Pol III transcription in C. albicans.

fems yeast research

The putative transcription factor CaMaf1 controls the sensitivity to lithium and rapamycin and represses RNA polymerase III transcription in Candida albicans