- Gallotannins and Tannic Acid: First Chemical Syntheses and in Vitro Inhibitory Activity on Alzheimer's Amyloid β-Peptide Aggregation
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The screening of natural products in the search for new lead compounds against Alzheimer's disease has unveiled several plant polyphenols that are capable of inhibiting the formation of toxic β-amyloid fibrils. Gallic acid based gallotannins are among these polyphenols, but their antifibrillogenic activity has thus far been examined using "tannic acid", a commercial mixture of gallotannins and other galloylated glucopyranoses. The first total syntheses of two true gallotannins, a hexagalloylglucopyranose and a decagalloylated compound whose structure is commonly used to depict "tannic acid", are now described. These depsidic gallotannins and simpler galloylated glucose derivatives all inhibit amyloid β-peptide (Aβ) aggregation invitro, and monogalloylated α-glucogallin and a natural β-hexagalloylglucose are shown to be the strongest inhibitors.
- Sylla, Tahiri,Pouységu, Laurent,Dacosta, Grégory,Deffieux, Denis,Monti, Jean-Pierre,Quideau, Stéphane
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supporting information
p. 8217 - 8221
(2015/07/07)
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- NOVEL GLYCOSYLTRANSFERASE, NOVEL GLYCOSYLTRANSFERASE GENE, AND NOVEL GLYCOSYL DONOR COMPOUND
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An object of the present invention is to provide a sugar donating reagent comprising a sugar donor compound other than a sugar nucleotide and an enzyme capable of catalyzing a glycosyl transfer reaction using a sugar donor compound other than a sugar nucleotide. The present invention provides the following: a sugar donating reagent containing a compound of formula (A): wherein R 1 is independently selected from hydrogen, or C 1-6 alkyl, C 2-6 alkenyl, and C 2-6 alkynyl in which each of the groups is unsubstituted or substituted with one or more groups selected from OH, F, Cl, Br, I, CN, NO 2 , and SO 2 , n is 0, 1, 2, 3, 4 or 5, m is 0 or 1, and X represents a monosaccharide bound via a 2 bond on its anomeric carbon; a glycosyltransferase capable of catalyzing a glycosyl transfer reaction using the sugar donor; and a glycosyltransferase gene comprising DNA encoding the glycosyltransferase.
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Paragraph 0112
(2015/09/22)
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