Vac7 is localised at the vacuole membrane, a location which is consistent with its involvement in vacuole morphology and inheritance [1]. Vac7 has been shown to function as an upstream regulator of the Fab1 lipid kinase pathway [2]. The Fab1 lipid pathway is important for correct regulation of membrane trafficking events. It has been identified as a LEA-2 homologue together with TMEM106B from humans and Tag1 in yeast, all predicted to be lipid transfer proteins [3].

1: Vac7p, a novel vacuolar protein, is required for normal vacuole inheritance and morphology. Bonangelino CJ, Catlett NL, Weisman LS; Mol Cell Biol. 1997;17:6847-6858. PMID:9372916

2: Regulation of Fab1 phosphatidylinositol 3-phosphate 5-kinase pathway by Vac7 protein and Fig4, a polyphosphoinositide phosphatase family member. Gary JD, Sato TK, Stefan CJ, Bonangelino CJ, Weisman LS, Emr SD; Mol Biol Cell. 2002;13:1238-1251. PMID:11950935

3: TMEM106B in humans and Vac7 and Tag1 in yeast are predicted to be lipid transfer proteins. Levine TP; Proteins. 2022;90:164-175. PMID:34347309