Jul 1, 1975

The effect of oxidazable substrates and ATP on the sensitivity of certain energy-dependent functions submitochondrial particles to phospholipases A, C and D

V V Kupriianov, V N Luzikov


The effect of NADH, succinate and ATP on the sensitivity of a number of energy-dependent functions of submitochondrial particles ot phospholipases A, C and D has been studied. It has been shown that in the conditions of oxidation of NADH and succinate by oxygen and also of ATP hydrolysis, the decrease in the phosphorylating activity of the particles under the action of phospholipases C and D accelerates. No such acceleration has been observed with phospholipase A. For other two functions, i. e. reverse electron transfer (ATP-dependent NAD+ reduction by succinate) and ATP-dependent transhydrogenase reaction the results proved to be different. Oxidizable substrates and ATP promoted the maintenance of these functions in the presence of phospholipase A, but did not retard their suppression by phospholipases C and D. The effects of NADH, succinate and ATP on the sensitivity of different energy-dependent functions of submitochondrial particles to phospholipases A, C and D could be removed by the uncoupling agent carbonyl cyanide-m-chlorophenyl hydrazone. The conclusion is made that the effects revealed are associated with an increase in the sensitivity of coupling sites II PAND/OR III to phospholipases C and D and with a decrease in ...Continue Reading

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Mentioned in this Paper

Uncoupling Agents
Electron Transport
Type C Phospholipases
Phospholipase A Activity
Visual Suppression

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