Coenzyme, any of a number of organic molecules that some enzymes require to function. Each such enzyme uses a specific coenzyme, which may alter the enzyme's structure or otherwise take part in the energy-producing or cell-building reaction involved. One coenzyme is nicotinamide adenine dinucleotide phosphate (NADP), essential in the process of photosynthesis. Coenzymes, together with certain inorganic chemicals, are known as enzyme cofactors.
Coenzymes are small organic non-protein molecules that carry chemical groups between enzymes. Many coenzymes are phosphorylated water-soluble vitamins. However, nonvitamins may also be coenzymes, such as ATP, the biochemical carrier of phosphate groups, or coenzyme A the coenzyme that carries acyl groups. Coenzyme Q is unusual as it carries electrons between enzymes by diffusing within cell membranes, as this coenzyme is not water soluble. The term coenzymes is commonly used loosely, and coenzymes can also be defined as organic, non-protein cofactors.[1] Coenzymes are also sometimes referred to as cosubstrates, but this usage is unusual.
Coenzymes are consumed in the reactions in which they are substrates, for example: the coenzyme NADH is converted to NAD+ by oxidoreductases. Coenzymes are however regenerated and their concentration maintained at a steady level in the cell.
A special subset of coenzymes are prosthetic groups. These have more in common with cofactors since they are tightly bound to enzymes and are not released as part of the reaction. Prosthetic groups include molybdopterin, lipoamide and biotin.
2007-02-14 20:52:34
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answer #1
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answered by mjanime 1
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Coenzymes are small organic non-protein molecules that carry chemical groups between enzymes. Many coenzymes are phosphorylated water-soluble vitamins. However, nonvitamins may also be coenzymes, such as ATP, the biochemical carrier of phosphate groups, or coenzyme A the coenzyme that carries acyl groups.
2007-02-14 20:42:29
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answer #2
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answered by EB 1
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Coenzymes are small organic and organic non-protein molecules that carry chemical communities between enzymes. Many coenzymes are phosphorylated water-soluble supplements. although, nonvitamins would additionally be coenzymes, which incorporate ATP, the biochemical service of phosphate communities, or coenzyme A the coenzyme that includes acyl communities. Coenzyme Q is unusual because it includes electrons between enzymes via diffusing interior cellular membranes, as this coenzyme isn't water soluble. The term coenzymes is often used loosely, and coenzymes is additionally defined as organic and organic, non-protein cofactors.[a million] Coenzymes are additionally each at times observed as cosubstrates, yet this utilization is unusual. Coenzymes are ate up interior the reactions wherein they're substrates, working example: the coenzyme NADH is switched over to NAD+ via oxidoreductases. Coenzymes are although regenerated and their concentration maintained at a mushy point interior the cellular. a particular subset of coenzymes are prosthetic communities. those have greater in hassle-free with cofactors via fact they're tightly absolute to enzymes and are not released as area of the reaction. Prosthetic communities incorporate coenzyme in yeast thiamine pyrophosphokinase
2016-12-17 10:27:15
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answer #3
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answered by ? 4
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