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• W4254181710 startingPage "817" @default.
• W4254181710 abstract "Nitric oxide (NO) is produced by NO synthase (NOS) in many cells and plays important roles in the neuronal, muscular, cardiovascular, and immune systems. In various disease conditions, all three types of NOS (neuronal, inducible, and endothelial) are reported to generate oxidants through unknown mechanisms. We present here the first evidence that peroxynitrite (ONOO–) releases zinc from the zinc-thiolate cluster of endothelial NOS (eNOS) and presumably forms disulfide bonds between the monomers. As a result, disruption of the otherwise SDS-resistant eNOS dimers occurs under reducing conditions. eNOS catalytic activity is exquisitely sensitive to ONOO–, which decreases NO synthesis and increases superoxide anion (O2.–) production by the enzyme. The reducing cofactor tetrahydrobiopterin is not oxidized, nor does it prevent oxidation of eNOS by the same low concentrations of OONO–. Furthermore, eNOS derived from endothelial cells exposed to elevated glucose produces more O2.–, and, like eNOS purified from diabetic LDL receptor–deficient mice, contains less zinc and fewer SDS-resistant dimers. Hence, eNOS exposure to oxidants including ONOO– causes increased enzymatic uncoupling and generation of O2.– in diabetes, contributing further to endothelial cell oxidant stress. Regulation of the zinc-thiolate center of NOS by ONOO– provides a novel mechanism for modulation of the enzyme function in disease." @default.
• W4254181710 created "2022-05-12" @default.
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• W4254181710 date "2002-03-15" @default.
• W4254181710 modified "2023-10-18" @default.
• W4254181710 title "Oxidation of the zinc-thiolate complex and uncoupling of endothelial nitric oxide synthase by peroxynitrite" @default.
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• W4254181710 doi "https://doi.org/10.1172/jci0214442" @default.
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