Involved in cell integrity signaling during vegetative growth at elevated temperature. Acts positively on the PKC1-MAPK pathway. Cell membrane sensor of oxidative stress in the cell integrity pathway upstream of PKC1. Required to transmit the oxidative signal to SLT2 and to restore the correct actin organization following oxidative stress. Multicopy suppressor of 1,3-beta-glucan synthase (GS) mutation. Also suppresses RGD1 null mutations. Belongs to the MID2 like cell wall stress sensor family.