The function of this domain is unknown but it is found at the C terminus of syndetin (VPS50), a unique component of the endosome-associated retrograde protein (EARP) complex. The EARP complex otherwise shares four of its five subunits with the Golgi-associated retrograde protein (GARP) complex. The EARP complex is localised to recycling to endosomes where it acts as a tethering complex for recycling of plasma membrane receptors [1].

1: EARP is a multisubunit tethering complex involved in endocytic recycling. Schindler C, Chen Y, Pu J, Guo X, Bonifacino JS; Nat Cell Biol. 2015;17:639-650. PMID:25799061