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PLANT PHYSIOLOGY , Vol 106, Issue 4 1527-1532, Copyright © 1994 by American Society of Plant Biologists

METABOLISM AND ENZYMOLOGY

Biosynthesis of Cardiolipin in Plant Mitochondria

M. Frentzen and R. Griebau
Institut fur Allgemeine Botanik, Universitat Hamburg, Ohnhorststrasse 18, D-22609 Hamburg, Germany

The properties of cardiolipin synthase were investigated in mitochondria and submitochondrial fractions from etiolated mung bean (Vigna radiata L.) seedlings. Direct evidence is presented that the enzyme utilizes CDP-diacylglycerol in addition to phosphatidylglycerol for the synthesis of cardiolipin. Cardiolipin synthase had an alkaline pH optimum of about 9 and required divalent cations for activity. Maximal activity was obtained in the presence of 16 mM MnCl2. The apparent Km values for CDP-diacylglycerol and phosphatidylglycerol were 0.8 and 50 [mu]M, respectively. Cardiolipin synthase was localized predominantly in the inner membrane of mung bean mitochondria and displayed a substrate species specificity. Highest activities were measured with the dioleoyl species of both CDP-diacylglycerol and phosphatidylglycerol, and somewhat lower activities were measured with mixed species of the two substrates containing a palmitoyl and an oleoyl group. On the other hand, the cardiolipin synthase hardly used the dipalmitoyl species and strongly discriminated against CDP-dipalmitoylglycerol from a mixture with CDP-dioleoylglycerol.


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