[Interaction between free fatty acids and Ca2+-dependent ATPase from sarcoplasmic reticulum membranes].
The interaction between free fatty acids and Ca2+-dependent ATPase, an intrinsic protein of sarcoplasmic reticulum membranes, was studied with relevance to the changes in membrane permeability induced by free fatty acids. It was found that only unsaturated fatty acids increase the permeability of reticulum membranes for Ca2+, this effect being completely reversible. The increase in the membrane permeability by fatty acids is coupled to a generation of a channel for Ca2+ efflux under effect of Ca2+-dependent ATPase. The interaction between fatty acids and Ca2+-dependent ATPase was demonstrated by the protein fluorescence and electron paramagnetic resonance methods, using spin-labelled fatty acid derivatives. A model demonstrating the increase of sarcoplasmic reticulum membrane permeability for Ca2+ in the presence of the fatty acid-Ca2+-dependent ATPase complex is proposed.
D000818:Animals; D002118:Calcium / Q000378:metabolism; D000252:Calcium-Transporting ATPases / Q000378:metabolism*; D002463:Cell Membrane Permeability / Q000187:drug effects; D004578:Electron Spin Resonance Spectroscopy; D005230:Fatty Acids, Nonesterified / Q000494:pharmacology*; D007425:Intracellular Membranes / Q000378:metabolism; D007473:Ion Channels / Q000378:metabolism; D007700:Kinetics; D011817:Rabbits; D012519:Sarcoplasmic Reticulum / Q000187:drug effects / Q000201:enzymology*; D013113:Spin Labels
D005230:Fatty Acids, Nonesterified; D007473:Ion Channels; D013113:Spin Labels; D000252:Calcium-Transporting ATPases; D002118:Calcium
Vzaimodeĭstvie svobodnykh zhirnykh kislot s Ca2+-zavisimoĭ ATPazoĭ sarkoplazmaticheskogo retiduluma.