What is the exo-acting enzyme called that catalyzes the hydrolysis of polysaccharide starch to release β-glucose?
What is the exo-acting enzyme called that catalyzes the hydrolysis of polysaccharide starch to release β-glucose? Correct Answer glucoamylases
Glucoamylases are exo-acting enzymes that catalyze the hydrolysis of
polysaccharide starch from the non-reducing end, releasing β-glucose.
Important Points
- Also called saccharifying enzymes.
- Produced mainly by Aspergillus niger and Aspergillus awamori.
- The majority of glucoamylases are stable at low temperatures.
Additional Information Cellulase:Cellulases are enzymes that act on polymeric cellulose and hydrolyze
β-1,4 linkages to liberate glucose units.
The three major classes of cellulases are endo-(1,4)-β-d-glucanase, exo-
(1,4)-β-d-glucanase and β-glucosidases.
β - amylase:
β-Amylase is an exoamylase that hydrolyzes α-1,4 glycosidic linkages of
polyglucan chains at the nonreducing end to produce maltose (4-O-α-d-
Glucopyranosyl-β-d-Glc).
The primary function of β-amylase is involvement in a starch
breakdown in plants.
α - amylase:
α-Amylases are starch-degrading enzymes capable of hydrolyzing α-1,4
glycosidic bonds of polysaccharides, which results in the production of
short-chain dextrins.
Exoenzyme is an enzyme secreted by a cell that functions outside that
cell.
Endoenzyme is an enzyme secreted by a cell that functions within that
cell.
