Epimerization of an Ascaroside-Type Glycolipid Downstream of the Canonical β-Oxidation Cycle in the Nematode <i>Caenorhabditis nigoni</i>
作者:Célia P. Bergame、Chuanfu Dong、Sylvain Sutour、Stephan H. von Reuß
DOI:10.1021/acs.orglett.9b03808
日期:2019.12.20
A species-specific ascaroside-type glycolipid was identified in the nematode Caenorhabditis nigoni using HPLC-ESI(-)-MS/MS precursor ion scanning, HR-MS/MS, and NMR techniques. Its structure containing an L-3,6-dideoxy-lyxo-hexose unit was established by total synthesis. The identification of this novel 4-epi-ascaroside (caenorhabdoside) in C. nigoni along with the previous identification of 2-epi-ascarosides (paratosides) in Pristionchus pacificus indicate that nematodes can generate highly specific signaling molecules by epimerization of the ascarylose building block downstream of the canonical beta-oxidation cycle.