Plant Endocytosis Requires the ER Membrane-Anchored Proteins VAP27-1 and VAP27-3

Publication date: 22 May 2018
Source:Cell Reports, Volume 23, Issue 8
Author(s): Giovanni Stefano, Luciana Renna, Clarissa Wormsbaecher, Jessie Gamble, Krzysztof Zienkiewicz, Federica Brandizzi
Through yet-undefined mechanisms, the plant endoplasmic reticulum (ER) has a critical role in endocytosis. The plant ER establishes a close association with endosomes and contacts the plasma membrane (PM) at ER-PM contact sites (EPCSs) demarcated by the ER membrane-associated VAMP-associated-proteins (VAP). Here, we investigated two plant VAPs, VAP27-1 and VAP27-3, and found an interaction with clathrin and a requirement for the homeostasis of clathrin dynamics at endocytic membranes and endocytosis. We also demonstrated direct interaction of VAP27-proteins with phosphatidylinositol-phosphate lipids (PIPs) that populate endocytic membranes. These results support that, through interaction with PIPs, VAP27-proteins bridge the ER with endocytic membranes and maintain endocytic traffic, likely through their interaction with clathrin.

Graphical abstract

Teaser

Stefano et al. demonstrate that plant VAPs (VAP27-1 and VAP27-3) interact with clathrin and with phosphatidylinositol-phosphate lipids (PIPs) that populate endocytic membranes. The findings support a model showing that, through interaction with PIPs and clathrin, VAP27-proteins bridge the ER with endocytic membranes and maintain endocytic traffic.


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