This entry represents a domain found at the N-terminal of Exocyst complex components EXOC6/Sec15, members of the complexes associated with tethering containing helical rods (CATCHR) fold family and homologous to subunits of other multisubunit tethering complexes (MTCs) such as Dsl1, Golgi-associated retrograde protein (GARP) and COG complexes [1,2,3], characterised by a coiled-coild region at the N-terminal and an alpha-helical bundle at the C-terminal [1]. This is a coiled-coil domain of Sec15 that forms an antiparallel zipper with Sec10 and interacts with the antiparallel zipper formed between Exo70-Exo84, which form a four-helical bundle part of the core of the exocyst [3].

1: 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

2: Sec15 interacts with Rab11 via a novel domain and affects Rab11 localization in vivo. Wu S, Mehta SQ, Pichaud F, Bellen HJ, Quiocho FA; Nat Struct Mol Biol. 2005;12:879-885. PMID:16155582

3: Cryo-EM structure of the exocyst complex. Mei K, Li Y, Wang S, Shao G, Wang J, Ding Y, Luo G, Yue P, Liu JJ, Wang X, Dong MQ, Wang HW, Guo W; Nat Struct Mol Biol. 2018;25:139-146. PMID:29335562