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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Svp1p defines a family of phosphatidylinositol 3,5-bisphosphate effectors.

Phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P2), made by Fab1p, is essential for vesicle recycling from vacuole/lysosomal compartments and for protein sorting into multivesicular bodies. To isolate PtdIns(3,5)P2 effectors, we identified Saccharomyces cerevisiae mutants that display fab1delta-like vacuole enlargement, one of which lacked the SVP1/YFR021w/ATG18 gene. Expressed Svp1p displays PtdIns(3,5)P2 binding of exquisite specificity, GFP-Svp1p localises to the vacuole membrane in a Fab1p-dependent manner, and svp1delta cells fail to recycle a marker protein from the vacuole to the Golgi. Cells lacking Svp1p accumulate abnormally large amounts of PtdIns(3,5)P2. These observations identify Svp1p as a PtdIns(3,5)P2 effector required for PtdIns(3,5)P2-dependent membrane recycling from the vacuole. Other Svp1p-related proteins, including human and Drosophila homologues, bind PtdIns(3,5)P2 similarly. Svp1p and related proteins almost certainly fold as beta-propellers, and the PtdIns(3,5)P2-binding site is on the beta-propeller. It is likely that many of the Svp1p-related proteins that are ubiquitous throughout the eukaryotes are PtdIns(3,5)P2 effectors. Svp1p is not involved in the contributions of FAB1/PtdIns(3,5)P2 to MVB sorting or to vacuole acidification and so additional PtdIns(3,5)P2 effectors must exist.[1]


  1. Svp1p defines a family of phosphatidylinositol 3,5-bisphosphate effectors. Dove, S.K., Piper, R.C., McEwen, R.K., Yu, J.W., King, M.C., Hughes, D.C., Thuring, J., Holmes, A.B., Cooke, F.T., Michell, R.H., Parker, P.J., Lemmon, M.A. EMBO J. (2004) [Pubmed]
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