Palmitoyltransferase specific for VAC8. Palmitoylates VAC8 at one or more of its N-terminal cysteine residues, which is required for its proper membrane localization (By similarity). hexadecanoyl-CoA + L-cysteinyl-[protein] = CoA + S-hexadecanoyl-L-cysteinyl-[protein] The DHHC domain is required for palmitoyltransferase activity. Belongs to the DHHC palmitoyltransferase family. PFA3 subfamily.