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Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry
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Nitrocytochrome c: synthesis, purification, and functional studies.

José M Souza1, Laura Castro, Adriana María Cassina

  • 1Department of Biochemistry, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.

Methods in Enzymology
|June 17, 2008
PubMed
Summary

Protein tyrosine nitration, forming 3-nitrotyrosine, can alter protein function. This study explores methods to synthesize and analyze nitrated cytochrome c, revealing functional changes in electron transport and peroxidatic activity.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Biology

Background:

  • Posttranslational protein modification involves tyrosine oxidation to 3-nitrotyrosine.
  • This modification is linked to inflammation and degenerative diseases.
  • While often reducing protein function, nitration can sometimes enhance it.

Purpose of the Study:

  • To describe methods for studying the chemical and biological properties of nitrocytochrome c.
  • To investigate the functional consequences of tyrosine nitration on cytochrome c.

Main Methods:

  • Synthesis of tyrosine-nitrated cytochrome c using various oxidants.
  • Purification of mononitrated cytochrome c species.
  • Mapping of tyrosine nitration sites.
  • Assessment of functional impacts on electron transport, peroxidatic activity, and apoptosome assembly.

Main Results:

  • Nitration of cytochrome c can occur through reactions with peroxynitrite, nitrite/H2O2, or nitric oxide/H2O2.
  • Nitrated cytochrome c exhibits reduced electron transport capacity.
  • Nitrated cytochrome c displays increased peroxidatic activity.

Conclusions:

  • Established methodologies allow for the synthesis, purification, and characterization of nitrocytochrome c.
  • Tyrosine nitration of cytochrome c leads to distinct functional alterations, impacting mitochondrial function and apoptosis pathways.