Component of the regulatory network controlling carbon source utilization through ubiquitination and deubiquitination involving creA, creB, creC, creD and acrB. May be involved in signaling by recognizing appropriately phosphorylated substrates via its arrestin domains and then recruit a HECT-type ubiquitin ligase such as hulA, leading to ubiquitination of the substrate, providing a link between ubiquitination and phosphorylation in protein regulation and stability (By similarity). Interacts with hulA. Belongs to the arrestin family.