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Post-translational modifications of superoxide dismutase
Fumiyuki Yamakura1, Hiroaki Kawasaki
1Department of Chemistry, Juntendo University School of Health Care and Nursing, Japan. yamakura@sakura.juntendo.ac.jp
Post-translational modifications like nitration and phosphorylation impact superoxide dismutase (SOD) activity, potentially serving as biomarkers and playing roles in disease pathology and redox signaling.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Post-translational modifications (PTMs) regulate protein function, influencing biological processes.
- Superoxide dismutase (SOD) enzymes are crucial for managing reactive oxygen species.
- Mass spectrometry advancements allow detailed analysis of protein PTMs, including SOD.
Purpose of the Study:
- To review covalent modifications of superoxide dismutase (SOD).
- To highlight the significance of specific modifications like nitration, phosphorylation, glutathionylation, and glycation.
- To discuss the implications of these modifications in disease and cellular signaling.
Main Methods:
- Literature review focusing on studies analyzing SOD post-translational modifications.
- Analysis of in vitro and in vivo experimental data regarding protein modification.
- Mass spectrometry-based identification and characterization of modified SOD.
Main Results:
- Nitration of human Cu,Zn SOD yields 6-nitrotryptophan, a potential biomarker for reactive nitrogen species.
- Nitration of human MnSOD at tyrosine 34 leads to inactivation and is implicated in diseases.
- Most SOD PTMs result in reduced enzyme activity, with phosphorylation and nitration showing reversibility.
Conclusions:
- PTMs of SOD, particularly nitration, are critical in disease pathogenesis and cellular redox balance.
- Reversible modifications like phosphorylation and nitration suggest a role in redox signaling pathways.
- Understanding SOD PTMs offers insights into disease mechanisms and potential therapeutic targets.
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