ENZYME entry: EC 2.4.1.184

Accepted Name
Galactolipid galactosyltransferase.
Alternative Name(s)
DGDG synthase.
Digalactosyldiacylglycerol synthase.
Galactolipid-galactolipid galactosyltransferase.
GGGT.
Interlipid galactosyltransferase.
Reaction catalysed
2 a 1,2-diacyl-3-O-(beta-D-galactosyl)-sn-glycerol <=> a 1,2-diacyl-3-O-(beta-D-galactosyl-(1->6)-beta-D-galactosyl)-sn-glycerol + a 1,2-diacyl-sn-glycerol
Comment(s)
  • The enzyme converts monogalactosyldiacylglycerol to digalactosyldiacylglycerol, trigalactosyldiacylglycerol and tetragalactosyldiacylglycerol.
  • All residues are connected by beta linkages.
  • The activity is localized to chloroplast envelope membranes, but it does not contribute to net galactolipid synthesis in plants, which is performed by EC 2.4.1.46 and EC 2.4.1.241.
  • Note that the beta,beta-digalactosyldiacylglycerol formed by this enzyme is different from the more common alpha,beta- digalactosyldiacylglycerol formed by EC 2.4.1.241.
  • The enzyme provides an important mechanism for the stabilization of the chloroplast membranes during freezing and drought stress.
Cross-references
BRENDA2.4.1.184
EC2PDB2.4.1.184
ExplorEnz2.4.1.184
PRIAM enzyme-specific profiles2.4.1.184
KEGG Ligand Database for Enzyme Nomenclature2.4.1.184
IUBMB Enzyme Nomenclature2.4.1.184
IntEnz2.4.1.184
MEDLINEFind literature relating to 2.4.1.184
MetaCyc2.4.1.184

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