2.4.1.241: digalactosyldiacylglycerol synthase

This is an abbreviated version!
For detailed information about digalactosyldiacylglycerol synthase, go to the full flat file.

Reaction

Synonyms

7942dgdA, DGD synthase, DGD1, DGD2, dgdA, DGDG synthase, DGDG synthase (ambiguous), digalactosyldiacylglycerol synthase 1, digalactosyldiacylglycerol synthase 1, chloroplast, digalactosyldiacylglycerol synthase 2, digalactosyldiacylglycerol synthase type 1, digalactosyldiacylglycerol synthase type 2, MtDGD1, UDP-galactose-dependent DGDG synthase, UDP-galactose-dependent digalactosyldiacylglycerol synthase, UDP-galactose:MGDG galactosyltransferase

ECTree

     2 Transferases

         2.4 Glycosyltransferases

             2.4.1 Hexosyltransferases

                2.4.1.241 digalactosyldiacylglycerol synthase

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Results	in table
1	Activating Compound
766	AA Sequence
1	CAS Registry Number
5	Cloned(Commentary)
5	Expression
8	General Information
12	Localization
2	Metals/Ions
7	Natural Substrates/ Products (Substrates)
31	Organism
5	Pathway
1	PDB ID
1	pH Optimum
1	pH Range
1	Posttranslational Modification
1	Protein Variants
1	Purification (Commentary)
1	Reaction
1	Reaction Type
17	Reference
3	Source Tissue
12	Substrates and Products (Substrate)
41	Synonyms
1	Systematic Name

Systematic Name

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Systematic Name on EC 2.4.1.241 - digalactosyldiacylglycerol synthase

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SYSTEMATIC NAME

IUBMB Comments

UDP-galactose:3-(beta-D-galactosyl)-1,2-diacyl-sn-glycerol 6-alpha-galactosyltransferase

Requires Mg2+. Diacylglycerol cannot serve as an acceptor molecule for galactosylation as in the reaction catalysed by EC 2.4.1.46, 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 [3]. 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 [3]. The enzyme has been localized to the outer side of chloroplast envelope membranes.