“…In agreement with a shared function of the four class C proteins, deletion of the remaining two subunits of either complex is less dramatic (Horazdovsky et al, 1996;Markgraf et al, 2009;Nakamura et al, 1997;Raymond et al, 1992;Raymond et al, 1990;Wada et al, 1992), suggesting that there is some functional redundancy of HOPS and CORVET within the endocytic pathway. In addition to the four shared class C proteins, CORVET contains two Rab5-binding subunits, Vps3 and Vps8, whereas HOPS has instead the Rab7-binding subunits Vps39 and Vps41 (also known as Vam6 and Vam2) (Abenza et al, 2010;Abenza et al, 2012;Markgraf et al, 2009;Peplowska et al, 2007;Price et al, 2000;Seals et al, 2000;Wurmser et al, 2000). The similarity between HOPS and CORVET suggests that intermediate complexes also exist, and indeed a complex of low abundance can be isolated that consists of the class C subunits, plus HOPS Vps41 and CORVET Vps3 Peplowska et al, 2007) (Fig.…”