The Vps13p-Cdc31p complex is directly required for TGN late endosome transport and TGN homotypic fusion

Mithu De, Austin N. Oleskie, Mariam Ayyash, Somnath Dutta, Liliya Mancour, Mohamed E. Abazeed, Eddy J. Brace, Georgios Skiniotis, Robert S. Fuller*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Yeast VPS13 is the founding member of a eukaryotic gene family of growing interest in cell biology and medicine. Mutations in three of four human VPS13 genes cause autosomal recessive neurodegenerative or neurodevelopmental disease, making yeast Vps13p an important structural and functional model. Using cell-free reconstitution with purified Vps13p, we show that Vps13p is directly required both for transport from the trans-Golgi network (TGN) to the late endosome/prevacuolar compartment (PVC) and for TGN homotypic fusion. Vps13p must be in complex with the small calcium-binding protein Cdc31p to be active. Single-particle electron microscopic analysis of negatively stained Vps13p indicates that this 358-kD protein is folded into a compact rod-shaped density (20 x 4 nm) with a loop structure at one end with a circular opening ~6 nm in diameter. Vps13p exhibits ATP-stimulated binding to yeast membranes and specific interactions with phosphatidic acid and phosphorylated forms of phosphatidyl inositol at least in part through the binding affinities of conserved N-and C-terminal domains.

Original languageEnglish (US)
Pages (from-to)425-439
Number of pages15
JournalJournal of Cell Biology
Volume216
Issue number2
DOIs
StatePublished - 2017

ASJC Scopus subject areas

  • Cell Biology

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