Occurrence of a novel fucose-containing pentaglycosylceramide with blood-group-B active determinant in Xenopus blastula cells: its possible involvement in cell-cell adhesion.
For understanding of the biological function of glycoconjugates during embryogenesis and morphogenesis, Xenopus laevis is considered a very useful animal model. We have found that blood-group-active molecules characteristically were distributed in the cell-cell contact region of Xenopus blastula cells. The chemical nature of blood-group-active glycoconjugates, including glycosphingolipids, is little known. T.l.c.-immunostaining using anti-blood-group-antigen antibodies showed that many species of blood group-B-active glycosphingolipids existed in the neutral glycosphingolipid fraction extracted from Xenopus laevis eggs. Among the B-active glycosphingolipids detected, two major components with the fastest mobility on a t.l.c. plate, tentatively termed XN-1 and XN-2, were isolated, and their chemical structures were characterized by gas chromatography-mass spectrometry, immunological anlaysis, fast-atom-bombardment mass spectrometry and 1H-n.m.r. spectroscopy. Both XN-1 and XN-2 had an identical pentaoligosaccharide structure, but differed in their ceramide moiety. The chemical structure is: [table: see text]. This is a novel type of pentaglycosylceramide with blood-group B activity, in that it lacks N-acetylhexosamine in its core carbohydrate structure. In this paper, a possible involvement of the blood-group antigen in the cell-adhesion process of Xenopus embryonic cells is discussed.
Nomura
K
K
Department of Biology, Faculty of Science, Kyushu University, Fukuoka, Japan.
Nakajo
N
N
Hidari
K I
KI
Nomura
H
H
Murata
M
M
Suzuki
M
M
Yamana
K
K
Hirabayashi
Y
Y
D000017:ABO Blood-Group System / Q000032:analysis / Q000737:chemistry; D000818:Animals; D001755:Blastocyst / Q000378:metabolism; D002240:Carbohydrate Sequence; D002448:Cell Adhesion; D002554:Cerebrosides / Q000737:chemistry / Q000302:isolation & purification*; D005260:Female; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000737:chemistry / Q000302:isolation & purification*; D014981:Xenopus / Q000097:blood / Q000378:metabolism*
D000017:ABO Blood-Group System; D002554:Cerebrosides; D009844:Oligosaccharides; C041200:pentaglycosyl ceramide