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Modulation of lysozyme function and degradation after nitration with peroxynitrite
Tiana V Curry-McCoy1, Natalia A Osna, Terrence M Donohue
1Liver Study Unit, Omaha Veterans Affairs Medical Center, USA. tcurrymccoy@unmc.edu
Peroxynitrite (PN) nitration of lysozyme decreases its activity and increases its degradation by the proteasome. This protein modification by PN is linked to ethanol metabolism and cellular defense mechanisms.
Area of Science:
- Biochemistry
- Molecular Biology
- Cellular Biology
Background:
- Peroxynitrite (PN), formed from superoxide and nitric oxide, increases during hepatic ethanol metabolism.
- PN can modify proteins, altering their structure and function.
- Ethanol metabolism can lead to increased PN levels, potentially causing cellular damage.
Purpose of the Study:
- To investigate PN-induced alterations in lysozyme structure and function.
- To determine if PN modification affects lysozyme's susceptibility to proteasome degradation.
Main Methods:
- Hen egg lysozyme was nitrated using PN or a PN donor (SIN-1).
- Assessed lysozyme activity, nitration status (3-nitrotyrosine adducts), and susceptibility to 20S proteasome degradation.
Main Results:
- Lysozyme nitration resulted in dose-dependent 3-nitrotyrosine adducts.
- Nitrated lysozyme showed decreased catalytic activity.
- Nitrated lysozyme exhibited enhanced susceptibility to proteasome degradation, with increased proteasome affinity.
Conclusions:
- Lysozyme nitration increases its affinity for the proteasome, enhancing proteolysis.
- This mechanism may represent a cellular defense against PN-induced protein damage and hepatotoxicity.
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