Abstract
Cytoplasmic and thylakoid membranes prepared from the cyanobacteria Anacystis nidulans and Synechocystis PCC 6714 were compared for their electron-transport activities. High cytochrome oxidase activity, which was sensitive to cyanide and azide, was found only in the thylakoid membranes of both strains. Activities of NAD(P)H-cytochrome c and succinate-cytochrome c oxidoreductase were low in both membranes from both strains. The NADH-cytochrome c oxidoreductase activity of the cytoplasmic membranes from Synechocystis was markedly stimulated by quinones, among which 2,5-dibromo-3-methyl-6-isopropyl- p-benzoquinone (DBMIB) was the most effective. High NADH-DBMIB oxidoreductase activity, which was relatively resistant to salt washing, was found in the cytoplasmic membranes from Synechocystis.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Bioenergetics
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