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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Measurement of Heme Synthesis Levels in Mammalian Cells
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Published on: July 9, 2015

Protein self-modification by heme-generated reactive species.

Enrico Monzani1, Stefania Nicolis, Raffaella Roncone

  • 1Dipartimento di Chimica Generale, Via Taramelli 12, Pavia, Italy.

IUBMB Life
|April 2, 2008
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Summary

Heme proteins like myoglobin can undergo self-modification when exposed to hydrogen peroxide (H2O2) and reactive species. These reactions, involving nitrogen species or catechols, lead to protein damage and aggregation.

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Area of Science:

  • Biochemistry
  • Protein Chemistry
  • Oxidative Stress

Background:

  • Heme proteins catalyze reactions generating reactive intermediates in the presence of hydrogen peroxide (H2O2).
  • These intermediates can lead to the formation of reactive species, such as organic radicals, which can modify proteins.

Purpose of the Study:

  • To investigate the self-modification of globin-type heme proteins (myoglobin, hemoglobin, neuroglobin) under specific oxidative conditions.
  • To characterize the types of protein modifications induced by reactive nitrogen species and quinones.

Main Methods:

  • Treatment of myoglobin, hemoglobin, and neuroglobin with sodium nitrite (NO2-) or catechols in the presence of H2O2.
  • Analysis of protein modifications including nitration, oxidation, crosslinking, and aggregation.

Main Results:

  • Reactive nitrogen species from NO2- induced nitration, oxidation, and crosslinking in heme proteins.
  • Quinones generated from catechols modified cysteine and histidine residues, leading to protein aggregation and precipitation.
  • The specific protein modifications were dependent on the protein type and reaction conditions.

Conclusions:

  • Heme proteins with globin folds are susceptible to self-modification via reactive species generated during oxidative processes.
  • These modifications can alter protein structure and function, potentially leading to aggregation and precipitation.
  • Understanding these self-modification pathways is crucial for comprehending protein behavior in oxidative environments.