This is the C-terminal domain of vacuolar protein sorting-associated protein 53 (Vps53), a component of the Golgi-associated retrograde complex (GARP), involved in retrograde transport from early and late endosomes to late Golgi by linking the vesicle through the t-SNARE Tgl1 to the Golgi, leading to the membrane fusion between late Golgi and endosomal vesicles [1,2]. This domain has a fold consisting of an alpha-helical bundle known as the CATCHR fold (complexes associated with tethering containing helical rods) which is shared by proteins of other tethering complexes, namely exocyst, COG and Dsl1 [2,3,4].

1: Structure of a C-terminal fragment of its Vps53 subunit suggests similarity of Golgi-associated retrograde protein (GARP) complex to a family of tethering complexes. Vasan N, Hutagalung A, Novick P, Reinisch KM; Proc Natl Acad Sci U S A. 2010;107:14176-14181. PMID:20660722

2: A structure-based mechanism for vesicle capture by the multisubunit tethering complex Dsl1. Ren Y, Yip CK, Tripathi A, Huie D, Jeffrey PD, Walz T, Hughson FM; Cell. 2009;139:1119-1129. PMID:20005805

3: Structural basis for the binding of SNAREs to the multisubunit tethering complex\tDsl1. Travis SM, DAmico K, Yu IM, McMahon C, Hamid S, Ramirez-Arellano G, Jeffrey PD, Hughson FM; J Biol Chem. 2020;295:10125-10135. PMID:32409579

4: Homology and Modular Evolution of CATCHR at the Origin of the Eukaryotic Endomembrane System. Santana-Molina C, Gutierrez F, Devos DP; Genome Biol Evol. 2021; [Epub ahead of print] PMID:34061181