PMID:6272307
| Citation |
Goldberg, DE, Rumley, MK and Kennedy, EP (1981) Biosynthesis of membrane-derived oligosaccharides: a periplasmic phosphoglyceroltransferase. Proc. Natl. Acad. Sci. U.S.A. 78:5513-7 |
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| Abstract |
Membrane-derived oligosaccharides (MDO) are glucose-containing constituents of the periplasmic space of Escherichia coli whose biosynthesis is closely linked to the metabolism of membrane phospholipids. A periplasmic enzyme has now been discovered that catalyzes the transfer of phosphoglycerol residues between species of MDO or to certain glucose-containing model substrates such as gentiobiose (6-O-beta-D-glucopyranosyl-D-glucose). The partially purified enzyme has an apparent molecular weight of about 56,000 in gel permeation chromatography, and has an absolute requirement for divalent cations, of which Mn2+ is most active. Although the transferase activity appears to be the physiological function of the enzyme, at low concentrations of acceptor, the enzyme (Enz) acts as a cyclase, with the liberation of cyclic 1(3),2-phosphoglycerol, suggesting the following mechanism: (formula, see text). |
| Links | |
| Keywords |
Binding, Competitive; Cations, Divalent/metabolism; Cell Compartmentation; Disaccharides/metabolism; Escherichia coli/enzymology; Escherichia coli/ultrastructure; Glycerophosphates/metabolism; Hydrogen-Ion Concentration; Hydrolysis; Membrane Lipids/metabolism; Oligosaccharides/metabolism; Phosphotransferases/metabolism; Polysaccharides, Bacterial/metabolism; Transferases (Other Substituted Phosphate Groups) |
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