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 |
|---|
| BRENDA | 2.4.1.184 |
| EC2PDB | 2.4.1.184 |
| ExplorEnz | 2.4.1.184 |
| PRIAM enzyme-specific profiles | 2.4.1.184 |
| KEGG Ligand Database for Enzyme Nomenclature | 2.4.1.184 |
| IUBMB Enzyme Nomenclature | 2.4.1.184 |
| IntEnz | 2.4.1.184 |
| MEDLINE | Find literature relating to 2.4.1.184 |
| MetaCyc | 2.4.1.184 |
| UniProtKB/Swiss-Prot |
|
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