This is the N-terminal domain found in fungal Atg proteins such as Atg29. In yeast, the induction of autophagy begins at a single perivacuolar site that is proximal to the vacuole, called the phagophore assembly site (PAS) [1]. Atg17-Atg29-Atg31 complex (Atg1 complex) formation is a prerequisite for PAS assembly. Functional analysis indicate that the N-terminal half Atg29 can bind Atg31 [2].

1: An overview of macroautophagy in yeast. Wen X, Klionsky DJ; J Mol Biol. 2016;428:1681-1699. PMID:26908221

2: The role of Atg29 phosphorylation in PAS assembly. Mao K, Chew LH, Yip CK, Klionsky DJ; Autophagy. 2013;9:2178-2179. PMID:24141181