This is the N-terminal beta-propeller of Regulator of MON1-CCZ1 complex (RMC1). RMC1 is a component of the the CCZ1-MON1 complex, which functions as a guanine exchange factor (GEF) for RAB7 during endocytic and autophagic flux to the lysosome [1]. This region may function analogously to the WIPI proteins to bind phosphoinositides at the membrane [1].

1: Systematic Analysis of Human Cells Lacking ATG8 Proteins Uncovers Roles for GABARAPs and the CCZ1/MON1 Regulator C18orf8/RMC1 in Macroautophagic and Selective Autophagic Flux. Vaites LP, Paulo JA, Huttlin EL, Harper JW; Mol Cell Biol. 2017; [Epub ahead of print] PMID:29038162