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ERM proteins: The missing actin linkers in clathrin-mediated endocytosis

Audun Sverre Kvalvaag, Kay Oliver Schink, Andreas Brech, Kirsten Sandvig, Sascha Pust
doi: https://doi.org/10.1101/307272
Audun Sverre Kvalvaag
1Department of Molecular Cell Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
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Kay Oliver Schink
1Department of Molecular Cell Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
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Andreas Brech
1Department of Molecular Cell Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
2Department of Molecular Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
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Kirsten Sandvig
1Department of Molecular Cell Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
2Department of Molecular Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
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  • For correspondence: sascha.pust@rr-research.no kirsten.sandvig@ibv.uio.no
Sascha Pust
1Department of Molecular Cell Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
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  • For correspondence: sascha.pust@rr-research.no kirsten.sandvig@ibv.uio.no
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Abstract

Canonical clathrin-coated pits (CCPs) are nucleated by the coordinated arrival of clathrin triskelia and AP2 adaptor proteins at phosphatidylinositol 4,5-bisphosphate (PIP2) enriched plasma membrane domains (1, 2). Subsequent propagation of the clathrin lattice helps to deform the membrane into a sharply curved pit (3). A large proportion of the initiated pits fall apart as abortive endocytic events within about 20 s, possibly due to insufficient cargo capture (4). Successful clathrin-mediated endocytosis (CME) is concluded when a clathrin-coated vesicle is released into the cell by dynamin-mediated fission of the CCP membrane neck (5, 6). A vast array of accessory proteins important for successful CME has been identified. Among these is actin, which has been shown to be required for the maturation and internalization of a subset of CCPs in human cells (7, 8). Actin dependency during CME correlates with elevated membrane tension, and CCP maturation requires actin polymerization during mitosis, in microvilli at the apical surface of polarized cells and in cells upon global mechanical stretching or hypotonic treatment (9–11). The Arp2/3 complex is thought to trigger an acute actin burst coinciding with CCP internalization, but how actin is recruited to CCPs in the first place is not known (12, 13). Here we show that the ERM (ezrin, radixin, moesin) protein family of membrane-actin linkers associates with CCPs, and that functional perturbation of ERM proteins impedes CCP maturation and reduces the rate of transferrin uptake. By total internal reflection fluorescence (TIRF) microscopy and unbiased object detection and tracking, we show that ezrin localizes to nascent CCPs and that these pits subsequently recruit actin. Based on these data, we propose a model in which activated ERM proteins recruit the initial actin filament during CME.

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Posted April 25, 2018.
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ERM proteins: The missing actin linkers in clathrin-mediated endocytosis
Audun Sverre Kvalvaag, Kay Oliver Schink, Andreas Brech, Kirsten Sandvig, Sascha Pust
bioRxiv 307272; doi: https://doi.org/10.1101/307272
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ERM proteins: The missing actin linkers in clathrin-mediated endocytosis
Audun Sverre Kvalvaag, Kay Oliver Schink, Andreas Brech, Kirsten Sandvig, Sascha Pust
bioRxiv 307272; doi: https://doi.org/10.1101/307272

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