Abstract
The effects of ferulic acid on L-malate oxidation in mitochondria isolated from soybean (Glycine max L.) seedlings were investigated. Oxygen uptake and the products of L-malate oxidation were measured under two conditions: pH 6.8 and 7.8. At acidic pH, the activity of the NAD+-linked malic enzyme (L-malate:NAD+oxidoreductase [decarboxylating] EC 1.1.1.39) was favoured, whereas at alkaline pH a predominance of the L-malate dehydrogenase activity (L-malate:NAD+oxidoreductase EC 1.1.1.37) was apparent. Ferulic acid inhibited basal and coupled respiration during L-malate oxidation either at acidic or alkaline pH, reducing also the amounts of pyruvate or oxaloacetate produced. The results suggest that the site of ferulic acid action is situated at some step that precedes the respiratory chain. An interference with the L-malate entry into the mitochondria could be an explanation for the effects of ferulic acid, but the possibility of a direct inhibition of both enzymes involved in L-malate oxidation cannot be ruled out.
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Sert, M., Ferraresi, M., Bernadelli, Y. et al. Effects of ferulic acid on L-malate oxidation in isolated soybean mitochondria. Biologia Plantarum 40, 345–350 (1997). https://doi.org/10.1023/A:1001005711955
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DOI: https://doi.org/10.1023/A:1001005711955