Tag1 is a vacuolar membrane protein involved in termination of autophagy. It regulates autophagy termination during persistent nitrogen starvation through Atg1p-mediated re-phosphorylation of Atg13p and PAS disassembly. It shows homology to LEA-2 domain, and together with TMEM106B from humans and Vac7 from yeast, are all predicted to be lipid transfer proteins [1]. Tag1 has 3 tandemly repeated LEA-2 domains [2].

1: Vacuolar protein Tag1 and Atg1-Atg13 regulate autophagy termination during persistent starvation in S. cerevisiae. Kira S, Noguchi M, Araki Y, Oikawa Y, Yoshimori T, Miyahara A, Noda T; J Cell Sci. 2021; [Epub ahead of print] PMID:33536246

2: 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