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Novel function of Wsc proteins as a methanol‐sensing machinery in the yeast Pichia pastoris

Wsc family proteins are plasma membrane spanning sensor proteins conserved from yeasts to mammalian cells. We studied the functional roles of Wsc family proteins in the methylotrophic yeast Pichia pastoris, and found that PpWsc1 and PpWsc3 function as methanol‐sensors during growth on methanol. PpWsc1 responds to a lower range of methanol concentrations than PpWsc3. PpWsc1, but not PpWsc3, also functions during high temperature stress, but PpWsc1 senses methanol as a signal that is distinct from high‐temperature stress. We also found that PpRom2, which is known to function downstream of the Wsc family proteins in the cell wall integrity pathway, was also involved in sensing methanol. Based on these results, these PpWsc family proteins were demonstrated to be involved in sensing methanol and transmitting the signal via their cytoplasmic tail to the nucleus via PpRom2, which plays a critical role in regulating expression of a subset of methanol‐inducible genes to coordinate well‐balanced methanol metabolism.