What is the function of oxidoreductase enzymes
Under the term Oxidoreductases summarizes a group of enzymes that catalyze redox reactions.
2 Classification of oxidoreductases
The oxidoreductases are divided into five groups.
Oxidases catalyze reactions in which hydrogen is transferred from a substrate to oxygen. This creates hydrogen peroxide.
Examples of oxidases:
Monooxygenases work with molecular oxygen and transfer an oxygen atom to a substrate. The other oxygen atom is transferred to hydrogen coming from a hydrogen donor, so that water is created.
Examples of monooxygenases:
Dioxygenases transfer molecular oxygen to a substrate.
Example for dioxygenases:
The catalase catalyzes the reaction of two molecules of hydrogen peroxide to oxygen and two molecules of water and is thus involved in the breakdown of reactive oxygen species. She needs heme iron.
The peroxidase transfers hydrogen to hydrogen peroxide, creating two molecules of water. Peroxidase also needs heme iron.
2.4.1 Anaerobic dehydrogenases
The anaerobic dehydrogenases are divided into three groups.
18.104.22.168 NAD / NADP-dependent dehydrogenases
These dehydrogenases transfer hydrogen from a substrate to NAD + or NADP +, so that NADH + H + or NADPH + H + and the oxidized substrate are formed.
Examples of NAD / NADP-dependent dehydrogenases:
22.214.171.124 FAD-dependent dehydrogenases
The FAD-dependent dehydrogenases transfer hydrogen from a substrate to FAD. This results in reduced FAD and the oxidized substrate.
Examples of FAD-dependent dehydrogenases:
126.96.36.199 Cytochrome-dependent dehydrogenases
These dehydrogenases catalyze the splitting of hydrogen bound to the substrate into two hydrogen ions and two electrons, with the electrons being transferred to the iron (III) ion, which is located in the cytochrome. The oxidized substrate, two hydrogen ions and two iron (II) ions are created.
Example of cytochrome-dependent dehydrogenases:
2.4.2 Aerobic dehydrogenases
The aerobic dehydrogenases catalyze reactions in which hydrogen is transferred from a substrate to an oxidized acceptor, the oxidized substrate and the reduced acceptor being formed. In a subsequent reaction, the hydrogen is transferred from the acceptor to oxygen. The products of this reaction are water and the oxidized acceptor.
Examples of aerobic dehydrogenases:
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