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Pathway Description
Degradation of Superoxides
Mus musculus
Category:
Metabolite Pathway
Sub-Category:
Metabolic
Created: 2018-01-21
Last Updated: 2019-08-30
Reactive oxygen species (ROS) are formed by the normal metabolic process of oxygen. Examples are superoxide, oxygen ions and peroxides and can be of either organic or inorganic origin. ROS are highly reactive due to unpaired valence shell electrons, and can cause serious damage to cells and cell organelles. The environment also may cause ROS to form, from sources such as drought, air pollutants, UV light, cold temperatures, and external chemicals. An organic example of ROS being formed is during the beta oxidation of fatty acids, or photorespiration in photosynthetic organisms. Aerobic organisms who produce energy through the electron transport chain in mitochondria produce ROS as a byproduct. ROS damage commmonly includes DNA damage, lipid peroxidation, oxidation of amino acids in proteins, and oxidatively inactivating enzymes by oxidation of cofactors. Most aerobic organisms have adapted to this dangerous condition of life, and have a system of enzymes and scavenging free radicals. Enzymes such as are essential for defense against ROS, and include superoxide dismutases (SODs) and hydroperoxidase (CAT). Superoxide dismutases are the primary method of disposal of ROS, and convert superoxide radicals to hydrogen peroxide and water. Catalase attacks the hydrogen peroxide produced by SODs, and converts it into oxygen and water. In skin cells, 5,6 dihydroxyindole-2-carboxylic acid oxidase in the melanosome membranes breaks down hydrogen peroxide into water and oxygen.
References
Degradation of Superoxides References
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Pubmed: 9376114
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Pubmed: 9163733
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Pubmed: 8406027
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Pubmed: 3132713
This pathway was propagated using PathWhiz -
Pon, A. et al. Pathways with PathWhiz (2015) Nucleic Acids Res. 43(Web Server issue): W552–W559.
Propagated from SMP0000468
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