Component of the SEA complex which coats the vacuolar membrane and is involved in intracellular trafficking, autophagy, response to nitrogen starvation, and amino acid biogenesis. Mediates inactivation of the TORC1 complex in response to amino acid starvation. Required for meiotic nuclear division. Component of the SEA complex composed of at least IML1/SEA1, RTC1/SEA2, MTC5/SEA3, NPR2, NPR3, SEA4, SEC13 and SEH1. Forms a heterodimer with NPR2. Belongs to the NPR3 family.