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  Enzymes

Enzymes:

A multitude of chemical changes take place in living cells in breaking down complex food substrates into their simpler compounds and also in producing cellular materials. These modifications are accomplished by enzymes. The term ‘ferments’ was employed originally as they acted alike to yeast fermentation. Though Kuhne (1878) coined the term enzyme Photomeaning “in yeast” in Greek. The Enzyme is stated as an organic catalyst explained by a living cell that accelerates the chemical changes. All enzymes are generated within the cell although some are excreted out and function in the cellular atmosphere and many others act within the cell. Those which are excreted out are termed as extracellular enzymes or exoenzymes. Such enzymes help in the degradation of complex food substances which cannot enter the cell directly. Cellulases excreted by microbes degrade cellulose to its component glucose. Glucose is absorbed by the cell. Such functioning within the cell is termed as intracellular enzymes or endoenzyme.

Enzymes generated by a fungi, bacterium, plants and animals are identical in characteristics. They are proteins or proteins joined with other chemical groups. The protein portion is termed as apoenzyme and the low molecular weight organic group is termed as coenzyme. Apoenzyme and coenzyme in combination is termed as holoenzyme that is active on substrate. Apoenzyme is a high molecular weight (i.e., protein) compound not dialyzable and inactive against substrate. The coenzymes are low molecular weight organic compounds simply dialyzable via a semi-permeable membrane and itself is inactive against substrate. On other hand whenever apo-enzyme and coenzyme join together to become holoenzyme that is active on substrate. Several of the B vitamins are the components of coenzymes.

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For illustration thiamine (B1) is in cocarboxylase, riboflavin into riboflavine adenine dinucleotide and niacin in Nicotinamide adenine dinucleotide. In certain enzymes the non protein portion of the enzyme is a metal like iron as in catalase. The metal ion might be bound with protein tightly or loosely bound (simply dialyzable) depending upon the enzyme.

Most enzymes need the metal ions like Mg++, Fe++, Zn++ and so on to get activated. The metal ions join with enzyme protein and are termed as inorganic coenzymes or cofactors. In case of some enzymes both cofactor (i.e., Inorganic) and a coenzyme (i.e., organic) are needed for enzyme activation.

 

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