title: Synthesis, (1-->3)-beta-D-glucanase-binding ability, and phytoalexin-elicitor activity of a mixture of 3,4-epoxybutyl (1-->3)-beta-D-oligoglucosides.
abstract: We describe a approach for the synthesis of a mixture of 3,4-epoxybutyl (1-->3)-beta-D-oligoglucosides. The particular (1-->3)-beta-D-glucan isolated from the cell walls of Saccharomyces cerevisiae was recovered from the aqueous medium as water-insoluble particles by the spray drying (GS) method, and it was characterized by FTIR spectroscopy. The acid-solubilized (1-->3)-beta-D-oligoglucosides were prepared by partial acid hydrolysis of glucan particles, which were qualitatively analyzed by fluorophore-assisted carbohydrate electrophoresis (FACE). The peracetylated 3-butenyl (1-->3)-beta-D-oligoglucosides were synthesized by treating peracetylated (1-->3)-beta-D-oligoglucosides with the 3-butenyl alcohols and a Lewis acid (SnCl4) catalyst. Epoxidation of the peracetylated 3-butenyl oligoglucosides took place with m-chloroperoxybenzoic acid (m-CPBA). NaOMe in dry methanol was used for the deacetylation of the blocked derivatives, to give the 3,4-epoxybutyl (1-->3)-beta-D-oligoglucoside mixture in an overall yield of 21%. The sample was analyzed by positive-ion electrospray ionization mass spectrometry (ESIMS). In a 3,4-epoxybutyl (1-->3)-beta-D-oligoglucoside-binding (1-->3)-beta-D-glucanase assay, we found that the (1-->3)-beta-D-glucanase was obviously inactivated by the 3,4-epoxybutyl (1-->3)-beta-D-oligoglucosides. At the same time, we found the 3,4-epoxybutyl (1-->3)-beta-D-oligoglucoside mixture was more active as compared to the underivatized oligoglucoside mixture in eliciting phytoalexin accumulation in tobacco cotyledon tissue. Furthermore, it could be kept for a longer time than a (1-->3)-beta-D-oligoglucoside mixture, which indicated it is much more stable than (1-->3)-beta-D-oligoglucosides.
authors.affiliation: School of Life Science and Technology, Huazhong University of Science and Technology (East Campus), 1037 Luoyu Lu, Wuhan 430074, China. huanghg1226.student@sina.com, huanghg1226@sina.com
authors.forename: Gang-Liang
authors.initials: GL
authors.lastname: Huang
authors.forename: Man-Xi
authors.initials: MX
authors.lastname: Liu
authors.forename: Xin-Ya
authors.initials: XY
authors.lastname: Mei
mesh_terms: D001681:Biological Assay; D018548:Cotyledon / Q000187:drug effects / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D004852:Epoxy Compounds / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D043326:Glucan 1,3-beta-Glucosidase / Q000378:metabolism*; D009844:Oligosaccharides / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D010936:Plant Extracts / Q000378:metabolism*; D011485:Protein Binding; D012441:Saccharomyces cerevisiae / Q000737:chemistry*; D012717:Sesquiterpenes; D013729:Terpenes; D014026:Nicotiana / Q000187:drug effects / Q000378:metabolism; D000094162:Phytoalexins
chemical_list: D004852:Epoxy Compounds; D009844:Oligosaccharides; D010936:Plant Extracts; D012717:Sesquiterpenes; D013729:Terpenes; D043326:Glucan 1,3-beta-Glucosidase; D000094162:Phytoalexins