Repository: Freie Universität Berlin, Math Department

Sub-membrane actin rings compartmentalize the plasma membrane

Rentsch, Jakob and Bandstra, Selle and Sezen, Batuhan and Sigrist, Philipp Stephan and Bottanelli, Francesca and Schmerl, Bettina and Shoichet, Sarah and Noé, Frank and Sadeghi, Mohsen and Ewers, Helge (2024) Sub-membrane actin rings compartmentalize the plasma membrane. Journal of Cell Biology (JCB), 223 (4). (In Press)

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The compartmentalization of the plasma membrane (PM) is a fundamental feature of cells. The diffusivity of membrane proteins is significantly lower in biological than in artificial membranes. This is likely due to actin filaments, but assays to prove a direct dependence remain elusive. We recently showed that periodic actin rings in the neuronal axon initial segment (AIS) confine membrane protein motion between them. Still, the local enrichment of ion channels offers an alternative explanation. Here we show, using computational modeling, that in contrast to actin rings, ion channels in the AIS cannot mediate confinement. Furthermore, we show, employing a combinatorial approach of single particle tracking and super-resolution microscopy, that actin rings are close to the PM and that they confine membrane proteins in several neuronal cell types. Finally, we show that actin disruption leads to loss of compartmentalization. Taken together, we here develop a system for the investigation of membrane compartmentalization and show that actin rings compartmentalize the PM.

Item Type:Article
Subjects:Mathematical and Computer Sciences
Mathematical and Computer Sciences > Mathematics
Mathematical and Computer Sciences > Mathematics > Applied Mathematics
Divisions:Department of Mathematics and Computer Science > Institute of Mathematics
ID Code:3053
Deposited By: Jana Jerosch
Deposited On:19 Jan 2024 09:42
Last Modified:07 Feb 2024 10:01

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