Oxidative stress and ROS are important players in the pathogenesis of numerous diseases. In addition to directly altering proteins, ROS also affects lipids with negative intrinsic curvature such as phosphatidylethanolamine (PE), producing PE adducts and lysolipids. The formation of PE adducts potentiates the protonophoric activity of mitochondrial uncoupling proteins, but the molecular mechanism remains unclear. Here, we linked the ROS-mediated change in lipid shape to the mechanical properties of the membrane and the function of uncoupling protein 1 (UCP1) and adenine nucleotide translocase 1 (ANT1). We show that the increase in the protonophoric activity of both proteins occurs due to the decrease in bending modulus in lipid bilayers in the presence of lysophosphatidylcholines (OPC and MPC) and PE adducts. Moreover, MD simulations showed that modified PEs and lysolipids change the lateral pressure profile of the membrane in the same direction and by the similar amplitude, indicating that modified PEs act as lipids with positive intrinsic curvature. Both results indicate that oxidative stress decreases stored curvature elastic stress (SCES) in the lipid bilayer membrane. We demonstrated that UCP1 and ANT1 sense SCES and proposed a novel regulatory mechanism for the function of these proteins. The new findings should draw the attention of the scientific community to this important and unexplored area of redox biochemistry.

A N Frumkin Institute of Physical Chemistry and Electrochemistry 119071 Moscow Russia

Department of Chemistry Faculty of Science University of Zagreb 10000 Zagreb Croatia

Department of Mathematics University of Chemistry and Technology 16628 Prague Czech Republic

Federal Research and Clinical Center of Physical Chemical Medicine 119435 Moscow Russia

Institute of Physiology Pathophysiology and Biophysics Department of Biomedical Sciences University of Veterinary Medicine Vienna 1210 Vienna Austria

Scientific Research Institute of System Biology and Medicine 117246 Moscow Russia

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Exploring the proton transport mechanism of the mitochondrial ADP/ATP carrier: FA-cycling hypothesis and beyond