Chemoenzymic synthesis of potentially caged glycosphingolipids [correction of glycoshingolipids] (GSLs): potentially caged lyso-G(M3) and its analogue.
In a previous work, a number of potentially caged sphingolipids and glycosphingolipids were chemically synthesized (Zehavi, 1997. Chem. Phys. Lipids 90, 55-61). The effects of GM3 and to a lesser extent, of lyso-GM3, are being studied. Considering that biologically inert, caged lyso-GM3 could be photolysed in the cell to release lyso-GM3, thus creating an attractive opportunity to study the subsequent sequence of events in the cell, the chemoenzymic synthesis of the potentially caged lyso-GM3, (5-acetamido-3,5-dideoxy-D-glycero-alpha-D-galacto-2-nonulopyranosylo nic acid)-(2-3)-beta-D-galactopyranosyl-(1-4)-beta-D-glucopyranosyloxy (1-1)- (2S,3R,4E)-2-(4-carboxymethyl-2-nitrobenzyloxycarbonyl-amino)-3-hy droxy-4- octadecene and of a potentially caged GM3 analogue, (5-acetamido-3,5-dideoxy-D- glycero-alpha-D-galacto-2-nonulopyranosylonic acid)-(2-3)-beta-D-galactopyranosyl-(1-4)-beta-D-glucopyranosyloxy -(1-3)- (2S, 3R, 4E)-2-(4-carboxymethyl-2-nitro-benzyloxycarbonylamino)-1- hydroxy-4-octadecene was undertaken. Both compounds, being 2-nitrobenzyloxycarbonyl derivatives, are light-sensitive and could be efficiently photolysed to the biologically active, corresponding lyso-GSLs.
Institute of Biochemistry, Food Sciences and Nutrition, Faculty of Agricultural, Food and Environmental Sciences, Hebrew University of Jerusalem, Rehovot, Israel.
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Tuchinsky
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Zehavi
D000818:Animals; D002240:Carbohydrate Sequence; D005679:G(M3) Ganglioside / Q000031:analogs & derivatives* / Q000096:biosynthesis / Q000138:chemical synthesis / Q000737:chemistry; D066298:In Vitro Techniques; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D015394:Molecular Structure; D010782:Photolysis
D005679:G(M3) Ganglioside; C056605:lyso-G(M3) ganglioside