Membrane controlled Mechanoregulation in PIEZO1 Interactions

Abstract

PIEZO channels are mechanosensitive membrane proteins whose activation is governed by the surrounding lipid environment. However, the direct mechanistic contribution of native membrane composition to the molecular interactions remains unclear. In this study, a systematic comparison is made between PIEZO1 reconstituted in detergent micelles and in cell membrane-derived nanodiscs, which preserve the native lipid composition. Initial characterization employing a combination of atomic force microscopy and coarse-grained molecular dynamics simulations unveils distinct physical signatures of PIEZO1 in these two environments. Single-molecule force spectroscopy measurements demonstrate that interaction between the extracellular domain of PIEZO1 and a specific antibody exhibits unique mechanical responses strongly influenced by the surrounding membrane. In nanodiscs, PIEZO1 exhibits reversible, elastic-like behavior with preserved structural integrity and consistent adhesion forces even when modulated by Yoda1 (agonist) and Dooku1 (antagonist). Conversely, micelles induce a plastic response with altered mechanosensitivity and functional stability. Based on these findings, we propose a possible membrane-mediated force transmission pathway and quantify a simplified interaction energy landscape. Collectively, our findings offer the initial direct evidence of how the native lipid environment mechanistically governs PIEZO1 interactions, establishing native membranes as critical determinants for mechanotransduction.