ENZYME entry: EC 2.4.1.241
Accepted Name |
Digalactosyldiacylglycerol synthase.
|
Alternative Name(s) |
DGDG synthase. |
UDP-galactose-dependent DGDG synthase. |
UDP-galactose-dependent digalactosyldiacylglycerol synthase. |
UDP-galactose:MGDG galactosyltransferase. |
Reaction catalysed |
UDP-alpha-D-galactose + 3-(beta-D-galactosyl)-1,2-diacyl-sn-glycerol <=> UDP + 3-(alpha-D-galactosyl-(1->6)-beta-D-galactosyl)-1,2-diacyl-sn-glycerol |
Cofactor(s) |
Mg(2+).
|
Comment(s) |
- Diacylglycerol cannot serve as an acceptor molecule for
galactosylation as in the reaction catalyzed by EC 2.4.1.46.
- 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.
|
Cross-references |
BRENDA | 2.4.1.241 |
EC2PDB | 2.4.1.241 |
ExplorEnz | 2.4.1.241 |
PRIAM enzyme-specific profiles | 2.4.1.241 |
KEGG Ligand Database for Enzyme Nomenclature | 2.4.1.241 |
IUBMB Enzyme Nomenclature | 2.4.1.241 |
IntEnz | 2.4.1.241 |
MEDLINE | Find literature relating to 2.4.1.241 |
MetaCyc | 2.4.1.241 |
UniProtKB/Swiss-Prot |
|
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