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. May be involved in a process influencing telomere capping. Component of the SEA complex composed of at least IML1/SEA1, RTC1/SEA2, MTC5/SEA3, NPR2, NPR3, SEA4, SEC13 and SEH1. Interacts with ribosomes. Leads to short telomeres. Present with 606 molecules/cell in log phase SD medium. Belongs to the WD repeat RTC1 family.