Y. Nagatsuka et al., A new phosphoglycerolipid, 'phosphatidylglucose', found in human cord red cells by multi-reactive monoclonal anti-i cold agglutinin, mAb GL-1/GL-2, FEBS LETTER, 497(2-3), 2001, pp. 141-147
Cord red cell membranes express many differentiation-related molecules. To
study such molecules, we have established human cell lines, termed CL-1 and
GL-2, by the Epstein-Barr virus transformation method, both of which produ
ce monoclonal anti-i cold agglutinin [Y. Nagatsuka et al,, Immunol. Lett, 4
6 (1995) 93-100], Thin layer chromatography immunoblotting analysis reveale
d that these antibodies had broad specificities reacting with a variety of
glycolipid antigens. Of the immunoreactive lipid antigens, a new phosphogly
cerolipid containing glucose from human cord red cells was found. The isola
ted lipid was unstable to alkaline hydrolysis and contained glucose as a so
le sugar, Secondary ion mass spectrum-collision-induced dissociation mass s
pectrometric analysis of this lipid gave the main molecular ion peak at m/z
885 corresponding to phosphatidylhexose. This antigen was susceptible to p
hospholipases A2, C and D but resistant to phosphatidylinositol-specific ph
ospholipase C. Two-dimensional nuclear magnetic resonance spectroscopy conf
irmed that glucose is linked to the sn-glycerol 3-phosphate residue with a
p-anomeric configuration, Based upon these combined results, we identified
this lipid as phosphatidyl-beta -D-glucose. This is the first report showin
g the presence of the glucosylated glycerophospholipid in mammalian sources
. (C) 2001 Federation of European Biochemical Societies. Published by Elsev
ier Science B.V. All rights reserved.