Has a role in establishing cell polarity. Together with cAMP-dependent protein kinase regulatory subunit BCY1, provides a negative feedback control on the cell wall integrity-signaling pathway by acting as a negative regulator of MAP kinase SLT2/MPK1. In heat-stressed cells appears to play a role in localizing BCY1 to the cytoplasm. Seems to interact with, and down-regulate, CDC42. Also acts as a suppressor of PKC1. May act as an integration point for distinct signaling pathways helping to maintain a balance among these different pathways.