Chemical structure of glycosphingolipids isolated fromSphingomonas paucimobilis

Abstract
Two novel glycosphingolipids were isolated fromSphingomonas paucimobilis and their structures were completely elucidated. The glycosyl portion of the glycosphingolipid consists of an α‐D‐Manp‐[1→2)‐α‐D‐Galp‐(1→6)‐α‐D‐GlcpN‐(1→4)‐α‐D‐GlcpA‐R tetrasaccharide. The hydrophobic residue R was found to be heterogeneous with respect to the dihydrosphingosine residue.Erythro‐1,3‐dihydroxy‐2‐amino‐octadecane anderythro‐1,3‐dihydroxy‐2‐amino‐cis‐13,14‐methyleneoctadecane were identified in comparable amounts. Both dihydrosphingosine derivatives were quantitatively substituted by an (S)‐2‐hydroxymyristic acid in amide linkage.

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