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Molybdenum enzymes xanthine oxidase and aldehyde oxidase exhibit nitrite reductase activity. A third molybdenum enzyme, sulfite oxidase (SO), catalyzes the oxidation of sulfite to sulfate. Given the structural and functional homology of SO to plant nitrate reductase, SO was investigated as a candidate nitrite reductase. Using gas-phase NO detection and physiological concentrations of enzyme, nitrite,...
The airway epithelium provides important barrier and host defense functions. Recent studies reveal that nitrite is an endocrine reservoir of nitric oxide (NO) bioactivity that is converted to NO by enzymatic reductases along the physiological oxygen gradient. Nitrite signaling has been described as NO dependent activation mediated by reactions with deoxygenated redox active hemoproteins, such as hemoglobin,...
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