Here we propose a general strategy to label carbohydrates with N-methyl-anthranilic acid to generate glycotools for fluorescence-based screening and carbohydrate–protein interaction studies.
Antifungal activity of 2α,3β-functionalized steroids stereoselectively increases with the addition of oligosaccharides
作者:Amy Cammarata、Sunil Kumar Upadhyay、Branko S. Jursic、Donna M. Neumann
DOI:10.1016/j.bmcl.2011.10.015
日期:2011.12
Invasive fungal infections pose a significant problem to the immune-compromised. Moreover, increased resistance to common antifungals requires development of novel compounds that can be used to treat invasive fungal infections. Naturally occurring steroidal glycosides have been shown to possess a range of functional antimicrobial properties, but synthetic methodology for their development hinders thorough exploration of this class of molecules and the structural components required for broad spectrum antifungal activity. In this report, we outline a novel approach to the synthesis of glycoside-linked functionalized 2 alpha,3 beta-cholestane and spirostane molecules and present data from in vitro screenings of the antifungal activities against human fungal pathogens and as well as mammalian cell toxicity of these derivatives. (C) 2011 Elsevier Ltd. All rights reserved.
Gold Glyconanoparticles: Synthetic Polyvalent Ligands Mimicking Glycocalyx-Like Surfaces as Tools for Glycobiological Studies
作者:África G Barrientos、Jesús M. de la Fuente、Teresa C. Rojas、Asunción Fernández、Soledad Penadés
DOI:10.1002/chem.200204544
日期:2003.5.9
methodology is described for tailoring sugar-functionalised gold nanoclusters (glyconanoparticles) that have 3D polyvalent carbohydrate display and globular shapes. This methodology allows the preparation of glyconanoparticles with biologically significant oligosaccharides as well as with differing carbohydrate density. Fluorescent glyconanoparticles have been also prepared for labelling cells in biological
Glycosylation of hederagenin with the trichloroacetimidate derivatives of six commercial disaccharides (D-cellobiose, D-lactose, D-maltose, D-melibiose, D-gentiobiose, D-isomaltose) was performed giving the protected saponins in high yields. Deprotection then gave the saponins which were transformed into the corresponding methyl esters. The hemolytic activity of these synthetic hederagenin diglycosides was measured in order to establish structure–activity relationships based on the type and sequence of the attached sugar for the free carboxylic acid and methyl ester saponins.