Abstract
Cytokine-driven nitric oxide (NO) synthase II provides cells with effectors for reactions at redox-sensitive site(s) of proteins. Iron regulatory proteins (IRP1 and IRP2), two post-transcriptional regulators of gene expression, are particularly sensitive to NO synthesis and to oxidative stress. IRP1 possesses a redox-active Fe-S cluster and can also exhibit aconitase activity. IRP2 has no Fe-S cluster but exhibits several redox-sensitive cysteine residues. Under proper redox conditions, both IRPs bind to iron-responsive elements in the untranslated region of mRNAs encoding proteins involved in iron metabolism and energy production. This review describes and compares the effects of NO, peroxynitrite, and reactive oxygen species on these two chemosensitive proteins.
MeSH terms
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Animals
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Cysteine / metabolism
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Cytokines / physiology
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Gene Expression Regulation / physiology
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Iron / physiology
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Iron Regulatory Protein 1
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Iron Regulatory Protein 2
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Iron-Regulatory Proteins
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Iron-Sulfur Proteins / chemistry
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Iron-Sulfur Proteins / metabolism*
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Mice
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Nitrates / physiology
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Nitric Oxide / metabolism*
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Nitric Oxide Synthase / metabolism
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Nitric Oxide Synthase Type II
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Oxidation-Reduction
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Oxidative Stress
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Protein Processing, Post-Translational*
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RNA, Messenger / metabolism
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RNA-Binding Proteins / chemistry
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RNA-Binding Proteins / metabolism*
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Rats
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Reactive Oxygen Species
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Regulatory Sequences, Nucleic Acid
Substances
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Cytokines
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Iron-Regulatory Proteins
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Iron-Sulfur Proteins
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Nitrates
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RNA, Messenger
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RNA-Binding Proteins
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Reactive Oxygen Species
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peroxynitric acid
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Nitric Oxide
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Iron
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Nitric Oxide Synthase
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Nitric Oxide Synthase Type II
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Nos2 protein, mouse
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Nos2 protein, rat
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Iron Regulatory Protein 1
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Iron Regulatory Protein 2
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Cysteine