Msc1 facilitates glucose starvation-induced remodeling of the nucleus-vacuole junction

The nucleus-vacuole junction (NVJ) is a membrane contact site between the nuclear envelope and the vacuole in yeast that undergoes dynamic remodeling in response to nutrient starvation. Here, we report that Msc1 is a glucose starvation (GS)-responsive NVJ factor. GS strongly induced Msc1 expression and promoted its accumulation at the NVJ. Although Msc1 is not essential for NVJ formation itself, loss of Msc1 impaired GS-dependent functional maturation of the NVJ, including stabilization and recruitment of multiple NVJ-associated proteins. Notably, GS-induced transcriptional activation of NVJ1 was markedly attenuated in msc1Δ cells, suggesting that proper NVJ remodeling contributes to the execution of stress-responsive transcriptional programs. Together, these findings establish Msc1 as an upstream regulator linking GS to functional remodeling of the NVJ and associated transcriptional responses.