Catalyzes the transfer of the sulfoquinovose moiety from UDP-sulfoquinovose to diacylglycerol during sulfolipid biosynthesis. Sulfolipid contributes to maintaining a negatively charged lipid-water interface, a requirement for proper function of photosynthetic membranes. Sulfolipid may also function as a substitute of anionic phospholipids under phosphate-limited growth conditions. Glycolipid biosynthesis. By phosphate depletion. Lack of sulfolipid leading to reduced growth under phosphate-limited growth conditions. Belongs to the glycosyltransferase group 1 family. Glycosyltransferase 4 subfamily.