COG6 is a component of the peripheral membrane COG complex that is involved in intra-Golgi protein trafficking. COG is located at the cis-Golgi, regulates tethering of retrograde intra-Golgi vesicles and consists of one octamer comprising two tetramers (COG1-4 and COG5-8) [1]. COG subunits belong to the Complex Associated with Tethering Containing Helical Rods (CATCHRs) family which also includes subunits from the evolutionary related GARP (Golgi-Associated Retrograde Protein), exocyst and Dsl1 complexes. CATCHRs proteins share a structural fold consisting of alpha-helical bundles in tandem at the C-terminal and a coiled-coil region at the N-terminal [1]. This entry represents the alpha-helical bundle found at the C-terminal of COG6.

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: 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