This family contains the Sec10 component (approximately 650 residues long) of the eukaryotic exocyst complex, which mediates the tethering of post-Golgi secretory vesicles to the plasma membrane and promotes the assembly of the SNARE complex for membrane fusion. It is also involved in cell polarisation, primary ciliogenesis, cytokinesis, pathogen invasion, tumourigenesis and metastasis [1,2]. The exocyst is a member of the Complex Associated with Tethering Containing Helical Rods (CATCHRs) which also includes DSL1, COG and GARP complexes, evolutionary related. They share structural features comprising alpha-helical bundles towards the C-terminal and coiled-coil regions at the N-terminal. This entry represents the alpha-helical bundles of Sec10 and related proteins, like Recyclin-1 which is involved in recycling plasma membrane proteins internalised by endocytosis [3,4] and Pof6, that together with skp1, is essential for septum processing and cell separation [5].

1: The exocyst affects protein synthesis by acting on the translocation machinery of the endoplasmic reticulum. Lipschutz JH, Lingappa VR, Mostov KE; J Biol Chem 2003;278:20954-20960. PMID:12665531

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

3: The F-box protein Rcy1p is involved in endocytic membrane traffic and recycling out of an early endosome in Saccharomyces cerevisiae. Wiederkehr A, Avaro S, Prescianotto-Baschong C, Haguenauer-Tsapis R, Riezman H; J Cell Biol. 2000;149:397-410. PMID:10769031

4: Skp1p and the F-box protein Rcy1p form a non-SCF complex involved in recycling of the SNARE Snc1p in yeast. Galan JM, Wiederkehr A, Seol JH, Haguenauer-Tsapis R, Deshaies RJ, Riezman H, Peter M; Mol Cell Biol. 2001;21:3105-3117. PMID:11287615

5: Skp1 and the F-box protein Pof6 are essential for cell separation in fission yeast. Hermand D, Bamps S, Tafforeau L, Vandenhaute J, Makela TP; J Biol Chem. 2003;278:9671-9677. PMID:12511573