A-acetyl glucosamine

Fig. 3. The stmcture of the nodulation (Nod) factors of i bium meliloti 2011 (44), where is 2 or 3, R is —H or—COCH, and R is C 2 as shown, C gT, or ie, a fatty acid chain having from 1 to 3 double bonds. The A/-acetyl glucosamine residues and an acyl moiety, R, are present ia all...

As far as the stereochemistry concerns, when the cyclization occurs through a Michael reaction, the thermodynamic product is generally obtained, but some exceptions have been observed such as that of A-acetyl glucosamine protected as 4,6-benzylidene, the reaction of which with [(ethoxycarbonyl)methylene]triphenylphosphorane afforded the ot-C-glycosyl compound stereoselectively.28... 

The arsenal of plant defense peptides contains members capable of binding carbohydrate residues, namely /31-4 linked A -acetyl glucosamine residues that form the biopolymer chitin. The actual mode of action remains unclear. Antifungal and antimicrobial activity has been shown in vitro. For example Ac-AMP2 is a small disulfide-rich chitin-binding peptide isolated from the seeds of Amaranthus caudatus with antimicrobial activity. It differs from Ac-AMP 1 by one additional arginine residue at the C-terminus. The structure was determined by NMR and contains a cystine knot motif. Ac-AMP2 displays a so-called hevein domain partly... 

Morrison, J. F. and Ebner, K. E. 1971A. Studies on galactosyltransferase. Kinetic investigations with A -acetyl glucosamine as the galactosyl group acceptor. J. Biol. Chem. 246, 3977-3984. 

The amino acid sequence deduced from ORF 23 (mnaA) shared homology with bacterial A-acetylglucosamine 2-epimerases that convert A-acetyl-glucosamine into A-acetylmannosamine, a precursor of sialic acids. ORF 9 and ORF 24 (neuB) both produce polypeptides that exhibited 25 and 31%... 

Fig. 10.4 Structures of the Lewis and blood group antigens expressed in H. pylori strains. See Moran (2008) for details. Abbreviations Fuc, fucose Gal, galactose GalNAc, IV-acetyl-galactosamine GlcNAc, A-acetyl-glucosamine Neu5Ac, A-acetyl-neuraminic (sialic) acid...

Biomass derived from several industrial fermentations may provide an economical source of biosorptive materials. Many species have cell walls with high concentrations of chitin, a polymer of A-acetyl-glucosamine that is a very effective biosorbent. 

The oxazolidinone protected A -acetyl glucosamine 4-OH derivative 221 exhibited enhanced reactivity as a glycosyl acceptor in a variety of coupling methods. The products were finally converted to the target A -acetylglucosaminyl saccharides under very mild conditions <03OL1297>. 

Thus, protein A is a galactosyltransferase (UDP-galactose A-acetyl-glucosamine-)8-4-galactosyltransferase EC 2.4.1.38). Its normal function... 

Bao M, Elmendorf BJ, Booth JL, Drake RR, Canfield WM. Bovine UDP-A-acetylglucosamine lysosomal-enzyme A-acetyl-glucosamine-1-phosphotransferase. 11. Enzymatic characteriza-hon and identification of the catalytic subunit. J. Biol. Chem. 1996 271(49) 31446-31451. 

Chitosan is a polymer of glucosamine and A-acetyl-glucosamine, obtained from crustacean shells. It has been used to lower blood lipid concentrations, for body weight reduction (26), and as an excipient in pharmaceutical formulations. 

Vauzeilles, B, Dausse, B, Palmier, S, Beau, J-M, A one-step (3-selective glycosylation of A-acetyl glucosamine and recombinant chitooligosaccharides, Tetrahedron Lett., 42, 7567-7570, 2001. 

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