Clustering of lipids driven by integrin

TL;DR

This paper presents an exactly solvable model demonstrating how integrin influences lipid clustering and membrane dynamics, revealing nonmonotonic behaviors dependent on shuttling timescales and membrane properties.

Contribution

It introduces a minimal analytical model linking integrin activity with lipid clustering and membrane deformation, providing insights into the mechanochemical pathways involved.

Findings

Deformation and clustering evolve nonmonotonically.

Analytic expressions for membrane velocity and deformation.

Dependence on shuttling timescales and membrane properties.

Abstract

Integrin is an important transmembrane receptor protein which remodels the actin network and anchors the cell membrane towards the extracellular matrix via mechanochemical pathways. The clustering of specific lipids and lipid-anchored proteins, which is essential for a certain type of endocytosis process, is facilitated at integrin-mediated active regions. To study this, we propose a minimal exactly solvable model which includes the interplay of stochastic shuttling between integrin on and off states with the intrinsic dynamics of the membrane. We obtain an analytic expression for the deformation and local membrane velocity, and thereby the evolution of clustering mediated by a single integrin. The deformation, velocity and lipid clustering evolve nonmonotonically and their dependences on the stochastic shuttling timescales and membrane properties are elucidated.