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Reversible Oxidative Modifications in Myoglobin and Functional Implications.

Mark H Mannino1, Rishi S Patel1, Amanda M Eccardt1

  • 1Department of Biology, Saint Louis University, St. Louis, MO 63103, USA.

Antioxidants (Basel, Switzerland)
|July 1, 2020
PubMed
Summary
This summary is machine-generated.

Exposure to hydrogen peroxide (H₂O₂) oxidizes myoglobin (Mb), increasing its peroxidase activity and causing aggregation. Ascorbic acid treatment reverses these oxidative modifications, restoring Mb

Keywords:
ditryptophandityrosinemyoglobinperoxidaseprotein aggregation

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oxidative Stress

Background:

  • Myoglobin (Mb) is an oxygen-binding protein crucial for muscle function.
  • Oxidative stress, particularly from hydrogen peroxide (H₂O₂), can modify proteins.
  • Understanding Mb's oxidative modifications is vital for muscle health research.

Purpose of the Study:

  • To investigate the effects of H₂O₂ on myoglobin's structure and function.
  • To determine if ascorbic acid can reverse H₂O₂-induced oxidative damage to Mb.
  • To elucidate the mechanisms underlying Mb's oxidative modifications and aggregation.

Main Methods:

  • In vitro exposure of myoglobin to hydrogen peroxide (H₂O₂).
  • Analysis of Mb's peroxidase activity with and without ascorbic acid.
  • Characterization of Mb's molecular weight and aggregation states using techniques like SDS-PAGE.
  • Identification of specific crosslinks (e.g., Mb-X, dityrosine, tryptophan modifications).

Main Results:

  • H₂O₂ exposure increased Mb's peroxidase activity and induced Mb-X formation.
  • Ascorbic acid treatment reversed Mb-X crosslinks and Mb aggregation.
  • H₂O₂ caused Mb to form dimers, trimers, and larger aggregates.
  • Dityrosine crosslinks were observed, but reversible aggregation suggested other crosslinks, possibly involving tryptophan, were key.

Conclusions:

  • Oxidative modifications of myoglobin by H₂O₂, including Mb-X formation and aggregation, are reversible by ascorbic acid.
  • Ascorbic acid effectively counteracts H₂O₂-induced changes in Mb's structure and function.
  • Further in vivo studies are needed to confirm the relevance of these in vitro findings in the intracellular environment.