2.4.1.184: galactolipid galactosyltransferase

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

Word Map on EC 2.4.1.184

2.4.1.184

chloroplast

galactolipids

digalactosyldiacylglycerol

monogalactosyldiacylglycerols

oleracea

spinacia

oligogalactolipids

1,2-diacylglycerol

phosphatidylcholine

phosphatidic

galactosylation

thermolysin

udp-galactose

udp-gal

carotenoid

galactose-labeled

glycerolipids

fumigation

triacylglycerols

plastids

ozone

pisum

thioesterase

acyl-coa

thermolysin-treated

sativum

Reaction

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

Synonyms

beta-GalT, DGD, galactolipid:galactolipid galactosyltransferase, galactosyltransferase, galactolipid-galactolipid, GGGT, interlipid galactosyltransferase, mono-beta-D-galactosyldiacylglycerol:mono-beta-D-galactosyldiacylglycerol beta-D-galactosyltransferase, tRNA (guanosine-2'-O-)-methyltransferase

ECTree

2 Transferases

2.4 Glycosyltransferases

2.4.1 Hexosyltransferases

2.4.1.184 galactolipid galactosyltransferase

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Results	in table
9	Activating Compound
6	AA Sequence
1	CAS Registry Number
1	Cloned(Commentary)
9	Inhibitors
11	Localization
19	Metals/Ions
2	Natural Substrates/ Products (Substrates)
9	Organism
3	Pathway
4	pH Optimum
1	pH Range
3	Protein Variants
1	Reaction
1	Reaction Type
9	Reference
2	Source Tissue
8	Substrates and Products (Substrate)
9	Synonyms
1	Systematic Name
1	Temperature Optimum [°C]
1	Temperature Range [°C]

Systematic Name

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Systematic Name on EC 2.4.1.184 - galactolipid galactosyltransferase

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1,2-diacyl-3-O-(beta-D-galactosyl)-sn-glycerol:1,2-diacyl-3-O-(beta-D-galactosyl)-sn-glycerol beta-D-galactosyltransferase

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, monogalactosyldiacylglycerol synthase, and EC 2.4.1.241, digalactosyldiacylglycerol synthase. 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.