The Glc2Man2-fragment of the N-glycan precursor – a novel ligand for the glycan-binding protein malectin?
作者:Lisa N. Müller、Claudia Muhle-Goll、Moritz B. Biskup
DOI:10.1039/c004502k
日期:——
The Glcα(1â3)Glcα(1â3)Manα(1â2)Man tetrasaccharide (Glc2Man2-fragment), a substructure of the natural N-glycan precursor, was synthesized. The interaction of this fragment with the protein malectin, a carbohydrate binding protein localized in the endoplasmatic reticulum, was investigated by 1H15N HSQC experiments and isothermal calorimetry. The chemical shift perturbations of nuclei in the protein's backbone caused by the binding of the Glc2Man2-fragment to malectin suggest a binding mode like the known ligand nigerose.
Synthesis of a branched d-glucotetraose, the repeating unit of the extracellular polysaccharides of Grifola umbellate, Sclerotinia libertiana, Porodisculus pendulus, and Schizophyllum commune fries
作者:Tomoya Ogawa、Toshiaki Kasuragi
DOI:10.1016/s0008-6215(82)80007-4
日期:1982.5
Abstract The synthesis of d -glucotetraose, 3-O-[3-O-β- d -glucopyranosyl-β- d -glucopyranosyl]-6-O-β- d -glucopyranosyl-α (and β)- d -glucopyranose, the repeating unit of the extracellular polysaccharides of Grifora umbellata, Sclerotinia libertiana, Porodisculus pendulus, and Schizophyllum commune Fries, is described.
Interglycosidic Acetals IV. Preparation and Regioselective Cleavage of Phenyl 2,2′ : 4,6 : 4′,6′-Tri-<i>O</i>-benzylidene-1-thio-<i>β</i>-laminaribiosides
isolated and characterized as phenyl 3′-O-acetyl-2,2′ : 4,6 : 4′,6′-tri-O-benzylidene-1-thio-β-laminaribioside, and the corresponding 3′-O-benzyl derivative 6. Upon a treatment with pyridinium p-toluenesulfonate, the interglycosidic 2,2′-acetal in 6 underwent selective cleavage to give the 2,2′-diol. Additionally, a reductive ring-opening reaction of 6 with lithium aluminium hydride/anhydrous aluminium chloride
Programmable selective acylation of saccharides mediated by carbene and boronic acid
作者:Wen-Xin Lv、Hang Chen、Xinglong Zhang、Chang Chin Ho、Yingguo Liu、Shuquan Wu、Haiqi Wang、Zhichao Jin、Yonggui Robin Chi
DOI:10.1016/j.chempr.2022.04.019
日期:2022.5
(NHC) catalysts for site-specific acylation of unprotected monoglycosides. The boronic acids provide transient shielding on certain hydroxyl groups (while simultaneously promoting reactions of other hydroxyl units) via dynamic covalent bonds to offer the first sets of selectivity controls. The NHC catalysts provide further layers of control by mediating selectiveacylation of the unshielded hydroxyl moieties