High Quality Content by WIKIPEDIA articles! Sulfoquinovosyl diacylglycerol, abbreviated SQDG, is a sulfur-containing but phosphorus-free lipid (sulfolipid) found in many photosynthetic organisms. In 1959 A. A. Benson and coworkers discovered a new sulfur-containing lipid in plants and identified it as sulfoquinovosyl diacylglycerol (SQDG). The sulfolipid structure was defined as 1,2-di-O-acyl-3-O-(6-deoxy-6-sulpho-?-D-glucopyranosyl)-sn-glycerol (SQDG). The distinctive feature of this substance is carbon bonded directly to sulphur as C-SO3. Sulfonic acids of this type are chemically stable and strong acids over a wide pH range (Barber and Gounaris, 1986). SQDG has been found in all photosynthetic plants, algae, cyanobacteria, purple sulfur and non-sulfur bacteria and is localised in the thylakoid membranes, being the most saturated glycolipid (Janero, Barrnett, 1981).

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