Galactolipid galactosyltransferase explained
| galactolipid galactosyltransferase |
| Ec Number: | 2.4.1.184 |
| Cas Number: | 66676-74-2 |
| Go Code: | 0046480 |
In enzymology, a galactolipid galactosyltransferase is an enzyme that catalyzes the chemical reaction
2 3-(beta-D-galactosyl)-1,2-diacyl-sn-glycerol
3-[alpha-D-galactosyl-(1->6)-beta-D-galactosyl]-1,2-diacyl-sn- glycerol + 1,2-diacyl-sn-glycerol
Hence, this enzyme has one substrate, 3-(beta-D-galactosyl)-1,2-diacyl-sn-glycerol, but 3 products: 3-[alpha-D-galactosyl-(1->6)-beta-D-galactosyl]-1,2-diacyl-sn-, glycerol, and 1,2-diacyl-sn-glycerol.
This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is 3-(beta-D-galactosyl)-1,2-diacyl-sn-glycerol:mono-3-(beta-D-galactos yl)-1,2-diacyl-sn-glycerol beta-D-galactosyltransferase. Other names in common use include galactolipid-galactolipid galactosyltransferase, galactolipid:galactolipid galactosyltransferase, interlipid galactosyltransferase, GGGT, DGDG synthase (ambiguous), and digalactosyldiacylglycerol synthase (ambiguous). This enzyme participates in glycerolipid metabolism.
References
- Dorne AJ, Block MA, Joyard J, Douce R . 1982 . The galactolipid-galactolipid galactosyltransferase is located on the outer surface of the outer-membrane of the chloroplast envelope . FEBS Lett. . 145 . 30 - 34 . 10.1016/0014-5793(82)81200-3 . free .
- Dorne AJ, Douce R. 1986 . Localization of galactolipid:galactolipid galactosyltransferase and acyltransferase in outer envelope membrane of spinach chloroplasts . Biochim. Biophys. Acta . 877 . 281 - 289 . 10.1016/0005-2760(86)90305-x.
- Heemskerk JWM . Jacobs FHH . Wintermans JFGM . 1988 . UDPgalactose-independent synthesis of monogalactosyldiacylglycerol An enzymatic activity of the spinach chloroplast envelope . Biochim. Biophys. Acta . 961 . 38 - 47 . 10.1016/0005-2760(88)90128-2.
- Kelly AA, Froehlich JE, Dormann P . 2003 . Disruption of the two digalactosyldiacylglycerol synthase genes DGD1 and DGD2 in Arabidopsis reveals the existence of an additional enzyme of galactolipid synthesis . Plant Cell . 15 . 2694 - 706 . 14600212 . 10.1105/tpc.016675 . 11 . 280572 .
- Benning C, Ohta H . 2005 . Three enzyme systems for galactoglycerolipid biosynthesis are coordinately regulated in plants . J. Biol. Chem. . 280 . 2397 - 400 . 15590685 . 10.1074/jbc.R400032200 . 4 . free .
