Fluorescence quenching in model membranes. 1. Characterization of quenching caused by a spin-labeled phospholipid.
A new method is described to evaluate contact between fluorophors and lipids in model membranes. This method utilizes a nitroxide spin-labeled phosphatidylcholine to quench th fluorescence from a variety of membrane-bound molecules by a static process. The distance dependence of the fluorescence quenching is analyzed in terms of simple models. The analysis shows that quenching of diphenylhexatriene, p-terphenyl, and molecules containing tryptophan arises only from spin-labeled phospholipid that is in contact with the fluorophor.
D004134:Dimyristoylphosphatidylcholine; D004578:Electron Spin Resonance Spectroscopy; D007700:Kinetics; D008081:Liposomes; D008433:Mathematics; D010713:Phosphatidylcholines; D013050:Spectrometry, Fluorescence; D013113:Spin Labels; D013696:Temperature
D008081:Liposomes; D010713:Phosphatidylcholines; D013113:Spin Labels; D004134:Dimyristoylphosphatidylcholine