title: The occurrence of glycosphingolipids containing mannose in the sea-water bivalve, Meretrix lusoria (Hamaguri).
abstract: Total neutral and acidic glycosphingolipids were prepared from whole tissues of the sea-water bivalve, Meretrix lusoria, and the former preparation was further fractionated into subgroups by silicic acid column chromatography. The fractions obtained as mono-(ceramide monosaccharide, CMS), di-(CDS) and triglycosylceramides (CTS) were characterized by thin-layer chromatography, partial hydrolysis with exoglycosidases, methylation studies, CrO3 oxidation, and GLC analysis of the component sugars, fatty acids and long-chain bases. The following structures are proposed: Gal-Cer and Glc-Cer for CMS, Gal(beta 1----4)Glc-Cer and Man(beta 1----4)Glc-Cer (MlOse2Cer) for CDS, Man(alpha 1----3)Man(beta 1----4)Glc-Cer (MlOse3Cer) and Gal(alpha 1----3)Man(beta 1----4)Glc-Cer (II3 alpha Gal-MlOse2Cer) for CTS. To our knowledge II3 alpha Gal-MlOse2Cer has not previously been reported. The fatty acid composition of CMS, CDS, and CTS consisted almost entirely of saturated C16-C24 acids with large amounts of 2-hydroxypalmitic acid and 2-hydroxystearic acid. The long-chain bases consisted of 4-sphingenine and 4,8-sphingadienine. More complex neutral glycolipids than CTS, as well as an acidic glycolipid, were examined by TLC and GLC of the constituent sugars, and an immunochemical technique.(ABSTRACT TRUNCATED AT 250 WORDS)
mesh_terms: D000818:Animals; D002240:Carbohydrate Sequence; D002849:Chromatography, Gas; D005227:Fatty Acids / Q000032:analysis; D006028:Glycosphingolipids / Q000032:analysis*; D008358:Mannose / Q000032:analysis; D008974:Mollusca / Q000032:analysis*; D012623:Seawater
chemical_list: D005227:Fatty Acids; D006028:Glycosphingolipids; D008358:Mannose