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[Two qualitatively different structuro-functional states of mitochondria].

Low (120 mosM) tonicity of incubation media of mitochondria was found to be associated with anomalous phase transition at 19--26 degrees C. A rise in temperature caused a decrease in the pyrene excitation in border lipids of the mitochondrial membrane. Within this temperature range the quenching of intrinsic protein fluorescence by pyrene was sharply decreased. It may be inferred from these data that at 100mosM tonicity and temperatures below 19 degrees C, mitochondrial membrane proteins are in an aggregated state. At temperatures above phase transition protein deaggregation takes place. It was shown that a decrease in tonicity from 300 to 120 mosM at 15 degrees C or a rise in temperature from 15 degrees to 37 degrees C at 300 mosM tonicity increased the phosphorylation of the 52 kDa mitochondrial protein. It was assumed that swelling of mitochondria in hypotonic media simulates one of the steps of the hormone-induced signal transfer in mitochondria in vivo.