This family includes TIP-1 (also known as Tip20) protein from yeast which is part of the Dsl1 complex, a multisubunit tethering complex involved in retrograde trafficking of vesicles from Golgi to ER [2-5], its homologue from animals RINT-1, a Rad50 interacting protein which participates in radiation induced checkpoint control [1,7] and in membrane trafficking from the endoplasmic reticulum (ER) to the Golgi complex; and MAIGO2 (Mag2) from plants which functions in the transport of storage protein precursors between the ER and Golgi complex [6]. They are part of the CATCHR (complexes associated with tethering containing helical rods) family which includes proteins from the GARP/EARP, exocyst, conserved oligomeric Golgi (COG), and Dsl1 complexes and share a structural fold consisting of helical bundles [5,7].

1: RINT-1, a novel Rad50-interacting protein, participates in radiation-induced G(2)/M checkpoint control. Xiao J, Liu CC, Chen PL, Lee WH; J Biol Chem 2001;276:6105-6111. PMID:11096100

2: The TIP1 gene of Saccharomyces cerevisiae encodes an 80 kDa cytoplasmic protein that interacts with the cytoplasmic domain of Sec20p. Sweet DJ, Pelham HR; EMBO J 1993;12:2831-2840. PMID:8334998

3: Structural characterization of Tip20p and Dsl1p, subunits of the Dsl1p vesicle tethering complex. Tripathi A, Ren Y, Jeffrey PD, Hughson FM; Nat Struct Mol Biol. 2009;16:114-123. PMID:19151722

4: 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

5: 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

6: MAG2 and three MAG2-INTERACTING PROTEINs form an ER-localized complex to facilitate storage protein transport in Arabidopsis thaliana. Li L, Shimada T, Takahashi H, Koumoto Y, Shirakawa M, Takagi J, Zhao X, Tu B, Jin H, Shen Z, Han B, Jia M, Kondo M, Nishimura M, Hara-Nishimura I; Plant J. 2013;76:781-791. PMID:24118572

7: 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