Inhibitory effect of sulfoquinovosyl diacylglycerol on prokaryotic DNA polymerase I activity and cell growth of Escherichia coli.

Abstract:

We isolated the glycolipids fraction from spinach (Spinacia oleracea L.) and found that the fraction inhibited the activities of prokaryotic DNA polymerase I from Escherichia coli (E. coli) and cell growth of E. coli. The fraction contained mainly three glycolipids, monogalactosyl diacylglycerol (MGDG), digalactosyl diacylglycerol (DGDG) and sulfoquinovosyl diacylglycerol (SQDG), and purified SQDG inhibited these activities, however, purified MGDG and DGDG had no influence. In the tested strains of E. coli, SQDG inhibited the cell proliferation of the JM109 strain. It could be considered that a SQDG-containing thylakoid membrane in plant chloroplasts might have anti-bacterial activity.

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