Aglycon diversity of brain sterylglucosides: Structure determination of cholesteryl- and sitosterylglucoside

Hisako Akiyama, Kazuki Nakajima, Yoshiyuki Itoh, Tomoko Sayano, Yoko Ohashi, Yoshiki Yamaguchi, Peter Greimel, Yoshio Hirabayashi

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8 Citations (Scopus)

Abstract

To date, sterylglucosides have been reported to be present in various fungi, plants, and animals. In bacteria, such as Helicobacter pylori, proton NMR spectral analysis of isolated 1-O-cholesteryl-β-D-glucopyranoside (GlcChol) demonstrated the presence of an α-glucosidic linkage. By contrast, in animals, no detailed structural analysis of GlcChol has been reported, in part because animal-derived samples contain a high abundance of glucosylceramides (GlcCers)/galactosylcerami-des, which exhibit highly similar chromatographic behavior to GlcChol. A key step in vertebrate GlcChol biosynthesis is the transglucosylation reaction catalyzed by glucocerebrosidase (GBA)1 or GBA2, utilizing GlcCer as a glucose donor. These steps are expected to produce a β-glucosidic linkage. Impaired GBA1 and GBA2 function is associated with neurological disorders, such as cerebellar ataxia, spastic paraplegia, and Parkinson's disease. Utilizing a novel three-step chromatographic procedure, we prepared highly enriched GlcChol from embryonic chicken brain, allowing complete structural confirmation of the β-glucosidic linkage by 1H-NMR analysis. Unexpectedly, during purification, two additional sterylglucoside fractions were isolated. NMR and GC/MS analyses confirmed that the plant-type sitosterylglucoside in vertebrate brain is present throughout embryonic development. The aglycon structure of the remaining sterylglucoside (GSX-2) remains elusive due to its low abundance. Together, our results uncovered unexpected aglycon heterogeneity of sterylglucosides in vertebrate brain.

Original languageEnglish
Pages (from-to)2061-2072
Number of pages12
JournalJournal of Lipid Research
Volume57
Issue number11
DOIs
Publication statusPublished - 2016

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Endocrinology
  • Cell Biology

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    Akiyama, H., Nakajima, K., Itoh, Y., Sayano, T., Ohashi, Y., Yamaguchi, Y., Greimel, P., & Hirabayashi, Y. (2016). Aglycon diversity of brain sterylglucosides: Structure determination of cholesteryl- and sitosterylglucoside. Journal of Lipid Research, 57(11), 2061-2072. https://doi.org/10.1194/jlr.M071480