Subunit of a palmitoyltransferase (PAT) complex with Erf2p; the PAT complex adds a palmitoyl lipid moiety to heterolipidated substrates such as Ras1p and Ras2p through a thioester linkage; required for palmitoylation, membrane attachment and function of Ras2p; localizes to the ER and the nucleus-vacuole junction