Tubulin Regulates Plasma Membrane Ca²⁺-ATPase Activity in a Lipid Environment-dependent Manner

Ca²⁺ plays a crucial role in cell signaling, cytosolic Ca²⁺ can change up to 10,000-fold in concentration due to the action of Ca²⁺-ATPases, including PMCA, SERCA and SCR. The regulation and balance of these enzymes are essential to maintain cytosolic Ca²⁺ homeostasis. Our laboratory has discovered a novel PMCA regulatory system, involving acetylated tubulin alone or in combination with membrane lipids. This regulation controls cytosolic Ca²⁺ levels and influences cellular properties such as erythrocyte rheology. This review summarizes the findings on the regulatory mechanism of PMCA activity by acetylated tubulin in combination with lipids. The combination of tubulin cytoskeleton and membrane lipids suggests a novel regulatory system for PMCA, which consequently affects cytosolic Ca²⁺ content, depending on cytoskeletal and plasma membrane dynamics. Understanding the interaction between acetylated tubulin, lipids and PMCA activity provides new insights into Ca²⁺ signaling and cell function. Further research may shed light on potential therapeutic targets for diseases related to Ca²⁺ dysregulation. This discovery contributes to a broader understanding of cellular processes and offers opportunities to develop innovative approaches to treat Ca²⁺-related disorders. By elucidating the complex regulatory mechanisms of Ca²⁺ homeostasis, we advance our understanding of cell biology and its implications for human health.