Glucose residue linkages, formation

The other form of starch, amylopectin, is a branched polymer containing both a(l,4) and a(l,6) glycosidic linkages. The 0(1,6) branch points may occur every 20-25 glucose residues and prevent helix formation (Figure 7.32a). The number of glucose units in amylopectin may vary from a few thousand to a million. 

Fig. 2.— Formation of Inter-chain Linkage by Q-Enzyme. (Key O— (1 a-D-glucose residue —> inter-chain linkage.)...

The formation of 3,6-anhydro-glucose residues was confirmed by analysis of the acid hydrolysis products. Paper chromatography as well as g.l.c. revealed the presence of 3,6-anhydro glucofura-nose and glucose. It was found that the glycosidic linkages of... 

Let us take the case of hexokinase which transfers a phosphate residue from ATP to glucose with the formation of ADP and glucose-6-phosphate. The hydrolysis of the pyrophosphate linkage of ATP gives 12,000 cdories and that of glucose-6-phosphate only yields 2,000-4,000 cal. During the... 

The so-called Q-razyme is a transglucosidase which converts one in every twenty 1-4 linka es of amylose into 1-6 linkages to form a branched chain. The enzyme only acts when at least forty-two glucose residues have been imited to form amylose. The formation reaction is the following ... 

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