9-glucosyl

Fig. 2. Dihydrochalcone glycoside (49), where R = H, OH, or O—alkyl and R = glucosyl, mtinosyl, neohesperidosyl, or xylosyl.

The trisaccharide raffiaose [512-69-6] which consists of a sucrose molecule with an a-D-galactopyranosyl unit linked 1 — 6 to its D-glucosyl unit, is the second most abundant oligosaccharide and, like sucrose, may be ubiquitous in the plant kingdom. However, it is present in only minor amounts as compared to sucrose. 

The S ->N rearrangement of pyridazinethione glycosides proceeds smoothly under the influence of mercury(II) bromide. For example, 3-(tetraacetyl-l-/3-D-glucosylmer-capto)pyridazines rearrange to 2-(tetraacetyl-l-/3-D-glucosyl)pyridazine-3(2//)-thiones. 

FIGURE 6.20 A disaccharide of galactose and glucose is covalently linked to the 5-hydroxyl group of hydroxylysines in collagen by the combined action of the enzymes galactosyl transferase and glucosyl transferase. 

Side chain type. Sderoglycan is typical and possesses tetrasaccharide repeating units due to a 1,6-jl-D-glucosyl side-chain on every third main chain residue. 

Both glucosyl copper reagents / -6c and a-8 underwent conjugate addition with complete retention of the configuration of the anomeric carbon and neither product isomer was contaminated with detectable levels of the other. 

The above mentioned Rho GTPases are glucosylated by the family of clostridial glucosylating cytotoxins. 

C. difficile toxin A and B Rho proteins Glucosylation Inactivation of Rho proteins Destruction of the cytoskeleton... 

Important members of this toxin family are Clostridium difficile toxins A and B, which are implicated in antibiotics-associated diarrhea and pseudomembranous colitis. The large clostridial cytotoxins are single-chain toxins with molecular masses of 250-308 kDa. The enzyme domain is located at the N terminus. The toxins are taken up from an acidic endosomal compartment. They glucosylate RhoA at Thr37 also, Rac and Cdc42 are substrates. Other members of this toxin family such as Clostridium sordellii lethal toxin possess a different substrate specificity and modify Rac but not Rho. In addition, Ras subfamily proteins (e.g., Ras, Ral, and Rap) are modified. As for C3, they are widely used as tools to study Rho functions [2] [4]. 

The 1—>6 isomer of cyclomaltohexaose should be named cyclohexakis-(l— 6)-a-D-glucosyl, rather than cycloisomaltohexaose,... 

The treatment of sucrose with anhydrous HF89 results in the formation of a complex mixture of pseudooligo- and poly-saccharides up to dp 14, which were detected by fast-atom-bombardment mass spectrometry (FABMS). Some of the smaller products were isolated and identified by comparison with the known compounds prepared86 88 a-D-Fru/-1,2 2,1 -p-D-Fru/j (1), either free or variously glucosylated, was a major product, and this is in accord with the known stability of the compound. The mechanism of formation of the products in the case of sucrose involves preliminary condensation of two fructose residues. The resultant dianhydride is then glucosylated by glucopyranosyl cation.89 The characterization of this type of compound was an important step because it has permitted an increased understanding of the chemical nature of caramels. 

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