Dictionary > Glycosidase

Glycosidase

Definition
noun, plural: glycosidases
(biochemistry) An enzyme catalyzing the hydrolysis of a glycoside
Supplement
Glycosidases are enzymes that assist in the hydrolysis of glycosides. They are capable of cleaving the glycosidic bonds such as those in cellulose and hemicellulose.
An example of glycosidases is the lysozyme. Lysozymes are capable of destroying the baceterial cell walls, particularly the gram-positive bacteria. Bacterial cell wall is made up of peptidoglycan of N-acetylmuramic acid and N-acetylglycosamine linked by glycosidic bonds. A damaged cell wall of bacteria makes them lose their cell shape and rigidity. They become vulnerable to the adverse effects of turgor pressure caused by high concentration of proteins and molecules inside the cell relative to the external environment. Apart from the anti-bacterial activity, glycosidases are also involved in other natural metabolic activities, such as trimming mannosidases in N-linked glycoprotein biosynthesis. In prokaryotes, particularly E. coli, glycosidases are involved in the regulation of the lac operon. In most eukaryotes, glycosidases are located inside the endoplasmic reticulum, Golgi apparatus, and lysosomes. They also occur in the intestinal tract and in saliva wherein they act on lactose, starch, sucrose, trehalose, etc.
Other examples of glycosidases are lactase, O-GlcNAcase, amylase, hyaluronidase, sucrose, and maltase.
Synonym(s):

  • glycoside hydrolase
  • glycosyl hydrolase

See also:

  • lysozyme
  • hydrolysis


  • You will also like...

    Human Neurology
    Human Neurology

    Human Neurology deals essentially with the nervous system of humans. It also features the various theories put forward b..

    The process of photosynthesis
    Photosynthesis – Photolysis and Carbon Fixation

    Photosynthesis is the process that plants undertake to create organic materials from carbon dioxide and water, with the ..

    dinosaurs
    The Dinosaurs

    Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..

    complete-dominance
    Dominance

    This tutorial presents Gregor Mendel's law of dominance. Learn more about this form of inheritance and how it can be pre..

    Water Cycle
    The Water Cycle

    The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

    "Cronopio dentiacutus", a prehistoric mammal (an illustration)
    Mammalian Ancestors

    Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..

    Related Articles...

    No related articles found

    See all Related Topics