Abstract
The protein-lipid interaction is an essential metabolic process that mediates cellular signaling and functions. Existing strategies for large-scale mapping studies of the protein-lipid interaction fall short in their incompatibility with metabolic incorporation or inability to remove unwanted interferences from lipidated proteins. By incorporating an alkyne-containing choline head group and a diazirine-modified fatty acid simultaneously into choline-containing phospholipids synthesized from live mammalian cells, protein-phospholipid interactions have been successfully imaged in live cells. Subsequent in situ profiling of the modified Cho phospholipid-crosslinked proteins followed by quantitative proteomics allowed identification of several hundred putative phospholipid-interacting proteins, some of which were further validated.
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