Nagatsuka Y, Kasama T, Ohashi Y, Uzawa J, Ono Y, Shimizu K, Hirabayashi Y. A new phosphoglycerolipid, ‘phosphatidylglucose’, found in human cord red cells by multi-reactive monoclonal anti-i cold agglutinin, mAb GL-1/GL-2.
FEBS Lett 2001;
497:141-7. [PMID:
11377429 DOI:
10.1016/s0014-5793(01)02464-4]
[Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Cord red cell membranes express many differentiation-related molecules. To study such molecules, we have established human cell lines, termed GL-1 and GL-2, by the Epstein-Barr virus transformation method, both of which produce monoclonal anti-i cold agglutinin [Y. Nagatsuka et al., Immunol. Lett. 46 (1995) 93-100]. Thin layer chromatography immunoblotting analysis revealed that these antibodies had broad specificities reacting with a variety of glycolipid antigens. Of the immunoreactive lipid antigens, a new phosphoglycerolipid containing glucose from human cord red cells was found. The isolated lipid was unstable to alkaline hydrolysis and contained glucose as a sole sugar. Secondary ion mass spectrum-collision-induced dissociation mass spectrometric analysis of this lipid gave the main molecular ion peak at m/z 885 corresponding to phosphatidylhexose. This antigen was susceptible to phospholipases A2, C and D but resistant to phosphatidylinositol-specific phospholipase C. Two-dimensional nuclear magnetic resonance spectroscopy confirmed that glucose is linked to the sn-glycerol 3-phosphate residue with a beta-anomeric configuration. Based upon these combined results, we identified this lipid as phosphatidyl-beta-D-glucose. This is the first report showing the presence of the glucosylated glycerophospholipid in mammalian sources.
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