Lipid osmosis, membrane tension, and other mechanochemical driving forces of lipid flow.

ABSTRACT: Nonvesicular lipid transport among different membranes or membrane domains plays crucial roles in lipid homeostasis and organelle biogenesis. However, the forces that drive such lipid transport are not well understood. We propose that lipids tend to flow towards the membrane area with a higher membrane protein density in a process termed lipid osmosis. This process lowers the membrane tension in the area, resulting in a membrane tension difference called osmotic membrane tension. We examine the thermodynamic basis and experimental evidence of lipid osmosis and osmotic membrane tension. We predict that lipid osmosis can drive bulk lipid flows between different membrane regions through lipid transfer proteins, scramblases, or other similar barriers that selectively pass lipids

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC10802412 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature