الفهرس 
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Abstract
1.1 Glycosidases .
Glycosidases are glycoprotein enzymes that hydrolyze glycosidic
bonds. They are involved in the catabolism of glycoconjugates and the
biosynthesis of glycoproteins [1]. There are two groups of these enzymes.
Exoglycosidases that act at external positions or the 01 igosaccharide chains
uch as cc-glucosidase (oc-D-glucosidc !;I ucohvdrolase, EC 3.2.1.20),
~-glucosidase (~-D-glucoside glucohydrolase. EC 3.2.1.21) and ~-
glucuronidase (~-D-glucuronide glucuronohy drolase, EC 3.2.1.31) [2]. The
ether group is termed endoglycosidases which act at internal positions of
the oligosaccharide chains such as cc-amylase (oc-D-glucan
glucanohydrolase 3.2.1.1), which hydrolyze the 1,4 - o; - D- glucosidic
linkages in polysaccharides containing three or more 1,4 - cc- linked D-
glucose units [3,4].
1.1.1 Classification of Glycosidases
Glycosidases are classified under hydrolases, though some of them
can also transfer glycosyl residues to oligosaccharides, polysaccharides
and other alcoholic acceptors. Glycosidases are subdivided into
hydrolysing O-glycosyl-, N-glycosyl- and S-glycosyl - compounds (3.