Antioxidant
H2O2}}->[{\ce {Peroxidases \atop catalase}}]{\underset {Water}{H2O}}}}} As with the chemical antioxidants, cells are protected ... In addition to its direct antioxidant effects, ascorbic acid is also a substrate for the redox enzyme ascorbate peroxidase, a ... such as ascorbate in the glutathione-ascorbate cycle, glutathione peroxidases and glutaredoxins, as well as reacting directly ... 2 Fe3+ + Ascorbate → 2 Fe2+ + Dehydroascorbate 2 Fe2+ + 2 H2O2 → 2 Fe3+ + 2 OH· + 2 OH− The relative importance of the ...
Haem peroxidase
... and bacterial catalase- peroxidases, exhibiting both peroxidase and catalase activities. It is thought that catalase-peroxidase ... Most haem peroxidases follow the reaction scheme: Fe3+ + H2O2 ⇌ {\displaystyle \rightleftharpoons } [Fe4+=O]R' (Compound I) + ... doi:10.1016/0959-440X(92)90230-5. Dalton DA (1991). "Ascorbate peroxidase". 2: 139-153. {{cite journal}}: Cite journal requires ... "Bacterial catalase-peroxidases are gene duplicated members of the plant peroxidase superfamily". Biochim. Biophys. Acta. 1080 ( ...
Cytochrome c peroxidase
... it acts as a sensor and a signaling molecule to exogenous H2O2, which activates mitochondrial catalase activity. In eukaryotes ... CCP has high sequence identity to the closely related ascorbate peroxidase enzyme. Amino acid analyzer studies reveal presence ... Atack JM, Kelly DJ (2007). "Structure, mechanism and physiological roles of bacterial cytochrome c peroxidases". Advances in ... Plant peroxidase such as horseradish peroxidase and pineapple peroxidase B have low lysine, tryptophan, and tyrosine contents ...
Peroxiredoxin
Catalase Oxidative stress Peroxidase Peroxiredoxin classification index Reactive oxygen species Superoxide dismutase Rhee, Sue ... Peroxiredoxins are proposed to play a role in cell signaling by regulating H2O2 levels. Plant 2-Cys peroxiredoxins are post- ... Monteiro G, Horta BB, Pimenta DC, Augusto O, Netto LE (March 2007). "Reduction of 1-Cys peroxiredoxins by ascorbate changes the ... Poole LB (January 2005). "Bacterial defenses against oxidants: mechanistic features of cysteine-based peroxidases and their ...
Reactive oxygen species
Dietz KJ (January 2016). "Thiol-Based Peroxidases and Ascorbate Peroxidases: Why Plants Rely on Multiple Peroxidase Systems in ... catalase}}]2H2O{}+O2}}\\&{\ce {2GSH{}+H2O2->[][{\text{glutathione}} \atop {\text{peroxidase}}]GS-SG{}+2H2O}}\end{aligned}}} ... Peroxiredoxins also degrade H2O2, within the mitochondria, cytosol, and nucleus. 2 H 2 O 2 → catalase 2 H 2 O + O 2 2 GSH + H 2 ... H2O2 hydrogen peroxide (H2O2) is also produced as a side product of respiration. Peroxynitrite (ONO−2) results from the ...