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Information on EC - digalactosyldiacylglycerol synthase

for references in articles please use BRENDA:EC2.4.1.241
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EC Tree
     2 Transferases
         2.4 Glycosyltransferases
             2.4.1 Hexosyltransferases
       digalactosyldiacylglycerol synthase
IUBMB Comments
Requires Mg2+. Diacylglycerol cannot serve as an acceptor molecule for galactosylation as in the reaction catalysed by EC, monogalactosyldiacylglyerol synthase. When phosphate is limiting, phospholipids in plant membranes are reduced but these are replaced, at least in part, by the glycolipids digalactosyldiacylglycerol (DGDG) and sulfoquinovosyldiacylglycerol . While both DGD1 and DGD2 are increased under phosphate-limiting conditions, DGD2 does not contribute significantly under optimal growth conditions. DGD2 is responsible for the synthesis of DGDG molecular species that are rich in C16 fatty acids at sn-1 of diacylglycerol whereas DGD1 leads to molecular species rich in C18 fatty acids . The enzyme has been localized to the outer side of chloroplast envelope membranes.
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The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
dgdg synthase, mtdgd1, digalactosyldiacylglycerol synthase 1, digalactosyldiacylglycerol synthase 2, 7942dgda, digalactosyldiacylglycerol synthase, udp-galactose-dependent dgdg synthase, more
UDP-alpha-D-galactose + 1,2-diacyl-3-O-(beta-D-galactosyl)-sn-glycerol = UDP + 1,2-diacyl-3-O-[alpha-D-galactosyl-(1->6)-beta-D-galactosyl]-sn-glycerol
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