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pubmed-article:15657065pubmed:abstractTextNO is an important factor that induces post-translational modifications of proteins by cellular reduction and oxidation mechanism: cysteinyl-nitrosylation or Tyr nitration. Nuclear factor (NF)-kappaB activity can be rapidly suppressed by sodium nitroprusside, a NO donor. This effect was effectively reversed by peroxynitrite scavenger deferoxamine, suggesting a Tyr nitration-mediated mechanism. Western blot with nitrotyrosine-specific antibody demonstrated that the p65 subunit of NF-kappaB was predominantly nitrated on Tyr residues. Tyr nitration of p65 induced its dissociation from p50, its association with IkappaBalpha, and subsequent sequestration of p65 in the cytoplasm by IkappaBalpha-mediated export. Liquid chromatography-coupled nanoelectrospray mass spectrometry revealed specific nitration on Tyr-66 and Tyr-152 residues of p65. Mutation studies confirmed that both Tyr-66 and Tyr-152 residues were important for the direct effects of NO on p65, which resulted in more p65 export and inactivation of NF-kappaB activity. This study identified a novel and efficient pathway where NO rapidly inactivated NF-kappaB activity by inducing Tyr nitration on p65.lld:pubmed
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pubmed-article:15657065pubmed:articleTitleTyrosine nitration on p65: a novel mechanism to rapidly inactivate nuclear factor-kappaB.lld:pubmed
pubmed-article:15657065pubmed:affiliationDepartment of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA.lld:pubmed
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