Structural studies on a lipoarabinogalactan of Crithidia fasciculata.

Abstract

The monosaccharide D-arabinopyranose has only been found in glycoconjugates of the trypanasomatid parasites Leishmania major, Endotrypanum schaudinni and Crithidia fasciculata. The donor molecule for the relevant arabinosyltransferases is known to be GDP-alpha-D-Arap in L. major and C. fasciculata, and the latter organism is being used to study the biosynthesis of GDP-alpha-D-Arap. In this study, we describe the structure of the terminal product of arabinose metabolism in C. fasciculata, namely lipoarabinogalactan. This molecule was purified by hydrophobic-interaction chromatography and studied by a variety of techniques, including gas chromatography-mass spectrometry, electrospray mass spec..