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Membrane potential modulates plasma membrane phospholipid dynamics and K-Ras signaling
Journal article   Peer reviewed

Membrane potential modulates plasma membrane phospholipid dynamics and K-Ras signaling

Yong Zhou, Ching-On Wong, Kwang-jin Cho, Dharini van der Hoeven, Hong Liang, Dhananiay P. Thakur, Jialie Luo, Milos Babic, Konrad E. Zinsmaier, Michael X. Zhu, …
Science (American Association for the Advancement of Science), Vol.349(6250), pp.873-876
08/21/2015
DOI: 10.1126/science.aaa5619
PMID: 26293964

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Abstract

Plasma membrane depolarization can trigger cell proliferation, but how membrane potential influences mitogenic signaling is uncertain. Here, we show that plasma membrane depolarization induces nanoscale reorganization of phosphatidylserine and phosphatidylinositol 4,5-bisphosphate but not other anionic phospholipids. K-Ras, which is targeted to the plasma membrane by electrostatic interactions with phosphatidylserine, in turn undergoes enhanced nanoclustering. Depolarization-induced changes in phosphatidylserine and K-Ras plasma membrane organization occur in fibroblasts, excitable neuroblastoma cells, and Drosophila neurons in vivo and robustly amplify K-Ras-dependent mitogen-activated protein kinase (MAPK) signaling. Conversely, plasma membrane repolarization disrupts K-Ras nanoclustering and inhibits MAPK signaling. By responding to voltage-induced changes in phosphatidylserine spatiotemporal dynamics, K-Ras nanoclusters set up the plasma membrane as a biological field-effect transistor, allowing membrane potential to control the gain in mitogenic signaling circuits.
 Multidisciplinary Sciences Science & Technology Science & Technology - Other Topics

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