CHARACTERIZATION OF BINDING OF GAL-BETA-4GLCNAC-SPECIFIC LECTINS FROMERYTHRINA-CRISTAGALLI AND ERYTHRINA-CORALLODENDRON TO GLYCOSPHINGOLIPIDS - DETECTION, ISOLATION, AND CHARACTERIZATION OF A NOVEL GLYCOSPHINGOLIPID OF BOVINE BUTTERMILK
S. Teneberg et al., CHARACTERIZATION OF BINDING OF GAL-BETA-4GLCNAC-SPECIFIC LECTINS FROMERYTHRINA-CRISTAGALLI AND ERYTHRINA-CORALLODENDRON TO GLYCOSPHINGOLIPIDS - DETECTION, ISOLATION, AND CHARACTERIZATION OF A NOVEL GLYCOSPHINGOLIPID OF BOVINE BUTTERMILK, The Journal of biological chemistry, 269(11), 1994, pp. 8554-8563
The lectins from seeds of Erythrina cristagalli and Erythrina corallod
endron were characterized for binding to glycolipids, using a chromato
gram binding assay, a microtiter well assay, and glycolipids coated on
erythrocytes. Both lectins bound to glycolipids having a terminal Gal
beta 4GlcNAc sequence and also, with similar affinity, to glycolipids
with terminal Fuc alpha 2Gal beta 4GlcNAc (blood group H determinant
on a type 2 chain). All other substitutions of Gal beta 4GlcNAc tested
abolished the binding. A binding epitope for the Erythrina lectins wa
s considered by comparison of minimum energy conformations of binding
and nonbinding glycolipids. A non-acid glycolipid, with lectin binding
activity, was found in bovine buttermilk. By mass spectrometry and pr
oton NMR spectroscopy it was shown to be a branched hexaglycosylcerami
de with the structure Gal beta 4Glc-NAc beta 6(Gal beta 4GlcNAc beta 3
)Gal beta 4Glc beta Cer. This glycosphingolipid has not been reported
before.