This is the BAR (Bin/amphiphysin/Rvs) domain of Sortin nexin 8 (Snx8), which can sense, stabilise and induce membrane curvature [1]. These proteins are involved in intracellular protein transport from early endosomes to the trans-Golgi network [1]. Its yeast counterpart, Mvp1 is required for sorting proteins to the vacuole [2].

1: Sorting nexin 8 regulates endosome-to-Golgi transport. Dyve AB, Bergan J, Utskarpen A, Sandvig K; Biochem Biophys Res Commun. 2009;390:109-114. PMID:19782049

2: Fission of SNX-BAR-coated endosomal retrograde transport carriers is promoted by the dynamin-related protein Vps1. Chi RJ, Liu J, West M, Wang J, Odorizzi G, Burd CG; J Cell Biol. 2014;204:793-806. PMID:24567361