Fmp27 (also known as Hob1) and Hob2 (YPR117W) are tube-forming lipid transport proteins which bind to phosphatidylinositols and affects phosphatidylinositol-4, 5-bisphosphate (PtdIns-4,5-P2) distribution [2,3,4]. They belong to the repeating beta-groove (RBG) superfamily together with VPS13, ATG2, SHIP164, Csf1/BLTP1 proteins, which are all conserved lipid transfer proteins containing long hydrophobic grooves [3,4]. They all share the same structure consisting of multiple repeating modules comprising five beta-sheets followed by a loop. This entry covers a conserved region in a RBG module, containing the conserved SW and GKG sequence motifs.

1: Gene loops juxtapose promoters and terminators in yeast. O'Sullivan JM, Tan-Wong SM, Morillon A, Lee B, Coles J, Mellor J, Proudfoot NJ; Nat Genet. 2004;36:1014-1018. PMID:15314641

2: Vps13-like proteins provide phosphatidylethanolamine for GPI anchor synthesis in the ER. Toulmay A, Whittle FB, Yang J, Bai X, Diarra J, Banerjee S, Levine TP, Golden A, Prinz WA; J Cell Biol. 2022; [Epub ahead of print] PMID:35015055

3: The Hob proteins are novel and conserved lipid-binding proteins at ER-PM contact sites. Neuman SD, Jorgensen JR, Cavanagh AT, Smyth JT, Selegue JE, Emr SD, Bashirullah A; J Cell Sci. 2022; [Epub ahead of print] PMID:34415038

4: A novel superfamily of bridge-like lipid transfer proteins. Neuman SD, Levine TP, Bashirullah A; Trends Cell Biol. 2022;32:962-974. PMID:35491307