Glucosamine A -acetylated

WGA Wheat germ A-Acetyl-P-D-glucosamine A-Acetyl-P-D-glucosamine... 

N-acetyl D-glucosamine A/-acetyl D-mannosamine N-acetyl D-galactosamine... 

A large number of bacterial polysaccharides are known [104]. The major structural component of the bacterial cell wall is a polysaccharide, known as murein and composed of a repeating unit of one A-acetyl-D-glucosamine and an O-lactyl substituted IV-acetyl-D-glucosamine (A-acetyl-D-muramic acid) see Sect. 7.3. 

O Figure 15 presents the structures of the three most important and abundant hexosamines found in nature fV-acetyl-D-glucosamine, A-acetyl-D-galactosamine, and IV-acetyl-D-man-nosamine. 

Murein + H O A -acetyl glucosamine + A -acetyl muramic acid... 

The mannose (Man) family, family 2, is the only family to have a ED constituent (Saier et al. 2005). Only this family includes systems that each can exhibit broad specificity for hexoses (glucose, mannose, fructose, glucosamine, A-acetyl glucosamine, etc.). These 6-TMS proteins evolved independently of the 10 TMS permeases of the Glc/Fru/Lac family (Figure 4.2b). All constituents of the Man family permeases (EA, EB, EC, and ED) are unique to this family, although the EA proteins have been incorporated into the late evolving Dha PTS (see below). 

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...

Auch die Darstellung weiterer Alkyl-A-acetyl-glucosaminide durch Erhitzen des Acetaminozuckers in den entsprechenden Alkoholen mit Austauschem ist beschrieben worden (276). Die a-Benzylglykoside des iV-Acetyl- (151) und des iV-Carbobenzoxy-glucosamins (93) entstehen durch Erhitzen des Zuckers in chlorwasserstoffhaltigem Benzylalkohol. 

Die Lado-N-biose I (146) kristallisiert als Dihydrat der a-Form in feinen Nadeln vom Schmelzpunkt 166 bis 167° und der spezifischen Drehung [a] 0 — + -f- 14°. Sie besteht aus A -Acetyl-u-glucosamin... 

The anion of nitromethane adds easily to the carbonyl functions of sugars. This is a useful strategy for extension of the carbon chain.100 2-Acetamido-2-deoxy-P-D-glucose (A-acetyl-D-glucosamine) is the carbohydrate unit of glycoproteins that occurs most often. The nitromethy-lation method provides a straightforward route to a series of C-glycosyl compounds with the acetamido functionality (Eq. 3.62).101... 

The mucin of the submaxillary gland appears to contain two muco-proteins.170 One js a D-glucosamine-di-n-mannose complex similar to that in the serum proteins, while the other is claimed to be a crystalline substance ChH260iiN, containing D-glucosamine, two acetyl residues and a polyhydroxy acid which is not a uronic acid. It appears to be a type of sulfate-free chondroitin. 

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