This is the C-terminal domain of sorting nexin 17 (SNX17) present in Homo sapiens. SNX17 localizes to early endosomes where it directly binds NPX(Y/F) motifs in the target receptors to mediate their rates of endocytic internalization, recycling, or degradation. The domain is known as terminal band 4.1/ezrin/radixin/moesin (FERM) domain. The FERM domain binds directly to the common motif, NPX(Y/F), in the cytoplasmic region of its target proteins [1].

1: Structural basis for endosomal trafficking of diverse transmembrane cargos by PX-FERM proteins. Ghai R, Bugarcic A, Liu H, Norwood SJ, Skeldal S, Coulson EJ, Li SS, Teasdale RD, Collins BM; Proc Natl Acad Sci U S A. 2013;110:E643-E652. PMID:23382219

2: Structural determinants for binding of sorting nexin 17 (SNX17) to the cytoplasmic adaptor protein Krev interaction trapped 1 (KRIT1). Stiegler AL, Zhang R, Liu W, Boggon TJ; J Biol Chem. 2014;289:25362-25373. PMID:25059659