Semiha Güler

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Photosynthetic membranes of higher plants contain specific nonphosphorous lipids like the sulfolipid sulfoquinovosyl diacylglycerol in addition to the ubiquitous phospholipid phosphatidylglycerol. In bacteria, an environmental factor that drastically affects thylakoid lipid composition appears to be the availability of phosphate. Accordingly, we discovered(More)
The sulfolipid 6-sulfo-alpha-D-quinovosyldiacylglycerol is associated with the thylakoid membranes of many photosynthetic organisms. Previously, genes involved in sulfolipid biosynthesis have been characterized only in the purple bacterium Rhodobacter sphaeroides. Unlike plants and cyanobacteria, photosynthesis in this bacterium is anoxygenic due to the(More)
OBJECTIVES Drug compounds interacting with the blood-brain barrier efflux transporter P-glycoprotein (P-gp) might have limited access to brain tissue. The aim of the present study was to evaluate whether nine potentially CNS-active Amaryllidaceae alkaloids of the crinine, lycorine and galanthamine types interact with P-gp. METHODS Alkaloids with(More)
The sulfolipid sulfoquinovosyldiacylglycerol is present in the photosynthetic membranes of plants and many photosynthetic bacteria. A novel gene, sqdX, essential for sulfolipid biosynthesis in the cyanobacterium Synechococcus sp. strain PCC7942 is proposed to encode the cyanobacterial sulfolipid synthase catalyzing the last reaction of the pathway.
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