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  • Title: p97 and p47 function in membrane tethering in cooperation with FTCD during mitotic Golgi reassembly.
    Author: Kaneko Y, Shimoda K, Ayala R, Goto Y, Panico S, Zhang X, Kondo H.
    Journal: EMBO J; 2021 May 03; 40(9):e105853. PubMed ID: 33555040.
    Abstract:
    p97ATPase-mediated membrane fusion is required for the biogenesis of the Golgi complex. p97 and its cofactor p47 function in soluble N-ethylmaleimide-sensitive factor (NSF) attachment protein receptor (SNARE) priming, but the tethering complex for p97/p47-mediated membrane fusion remains unknown. In this study, we identified formiminotransferase cyclodeaminase (FTCD) as a novel p47-binding protein. FTCD mainly localizes to the Golgi complex and binds to either p47 or p97 via its association with their polyglutamate motifs. FTCD functions in p97/p47-mediated Golgi reassembly at mitosis in vivo and in vitro via its binding to p47 and to p97. We also showed that FTCD, p47, and p97 form a big FTCD-p97/p47-FTCD tethering complex. In vivo tethering assay revealed that FTCD that was designed to localize to mitochondria caused mitochondria aggregation at mitosis by forming a complex with endogenous p97 and p47, which support a role for FTCD in tethering biological membranes in cooperation with the p97/p47 complex. Therefore, FTCD is thought to act as a tethering factor by forming the FTCD-p97/p47-FTCD complex in p97/p47-mediated Golgi membrane fusion.
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