METHOD FOR PREPARING C-6 PHOSPHORYLATED D-ALDOHEXOSES AND C-6 PHOSPHORYLATED D-ALDOHEXOSE DERIVATIVES, AND NEW C-6 PHOSPHORYLATED D-ALDOHEXOSE DERIVATIVES
申请人:Libragen
公开号:EP2150620A2
公开(公告)日:2010-02-10
Method for preparing C-6 phosphorylated D-aldohexoses and C-6 phosphorylated D-aldohexose derivatives, and new C-6 phosphorylated D-aldohexose derivatives
申请人:Libragen
公开号:EP2150620B1
公开(公告)日:2011-08-10
[EN] METHOD FOR PREPARING C-6 PHOSPHORYLATED D-ALDOHEXOSES AND C-6 PHOSPHORYLATED D-ALDOHEXOSES DERIVATIVES AND NEW C-6 PHOSPHORYLATED D-ALDOHEXOSES DERIVATIVES<br/>[FR] PROCÉDÉ DE PRÉPARATION DE D-ALDOHEXOSES C-6 PHOSPHORYLÉES ET DE DÉRIVÉS DE D-ALDOHEXOSES C-6 PHOSPHORYLÉES ET NOUVEAUX DÉRIVÉS DE D-ALDOHEXOSES C-6 PHOSPHORYLÉES
申请人:LIBRAGEN
公开号:WO2008142155A2
公开(公告)日:2008-11-27
[EN] The present invention concerns a method for preparing C-6 phosphorylated D- aldohexoses and C-6 phosphorylated D-aldohexose derivatives, new C-6 phosphorylated D-aldohexoses derivatives and uses thereof. The method comprises incubating polyphosphate as sole source of phosphate donor and a polyphosphate-glucose phosphotransferase (polyphosphate: D-glucose 6-phosphotransferase, EC 2.7.1.63) in an aqueous solution with aD-aldohexose or a D-aldohexose derivative. [FR] L'invention porte sur un procédé de préparation de D-aldohexoses C-6 phosphorylées et de dérivés de D-aldohexoses C-6 phosphorylées, sur de nouveaux dérivés de D-aldohexoses C-6 phosphorylées et sur des utilisations de ces derniers. Le procédé de l'invention consiste à faire incuber un polyphosphate, comme source unique de donneurs de phosphate, et une polyphosphate-glucose phosphotransférase (polyphosphate: D-glucose 6-phosphotransférase, EC 2.7.1.63) dans une solution aqueuse avec une D-aldohexose ou un dérivé de D-aldohexose.
Automated Polysaccharide Synthesis: Assembly of a 30mer Mannoside
作者:Oliviana Calin、Steffen Eller、Peter H. Seeberger
DOI:10.1002/anie.201210176
日期:2013.5.27
Automated carbohydrate synthesis breaks new grounds: The longest sugar chemically synthesized to date (a 30 mer) has been accessed. Key to the process is the use of a catch–release technique, which labels the saccharide, thus allowing it to be separated later through temporary attachement to magnetic particles.
The endotoxic portion of lipopolysaccharide (LPS), a glycophospholipid Lipid A, initiates the activation of the Toll-like Receptor 4 (TLR4)myeloid differentiation factor 2 (MD-2) complex, which results in pro-inflammatory immune signaling. To unveil the structural requirements for TLR4 center dot MD-2-specific ligands, we have developed conformationally restricted Lipid A mimetics wherein the flexible beta GlcN(1 -> 6)GlcN backbone of Lipid A is exchanged for a rigid trehalose-like alpha GlcN(1 <-> 1)alpha Man scaffold resembling the molecular shape of TLR4 center dot MD-2-bound E. coli Lipid A disclosed in the X-ray structure. A convergent synthetic route toward orthogonally protected alpha GlcN(1 <-> 1)alpha Man disaccharide has been elaborated. The alpha,alpha-(1 <-> 1) linkage was attained by the glycosylation of 2-N-carbamate-protected alpha-GlcN-lactol with N-phenyl-trifluoroacetimidate of 2-O-methylated mannose. Regioselective acylation with (R)-3-acyloxyacyl fatty acids and successive phosphorylation followed by global deprotection afforded bis- and monophosphorylated hexaacylated Lipid A mimetics. alpha GlcN(1 <-> 1)alpha Man-based Lipid A mimetics (alpha,alpha-GM-LAM) induced potent activation of NF-kappa B signaling in hTLR4/hMD-2/CD14-transfected HEK293 cells and robust LPS-like cytokines expression in macrophages and dendritic cells. Thus, restricting the conformational flexibility of Lipid A by fixing the molecular shape of its carbohydrate backbone in the agonistic conformation attained by a rigid alpha GlcN(1 <-> 1)alpha Man scaffold represents an efficient approach toward powerful and adjustable TLR4 activation.