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Redox Reactions01:27

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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A simple method to engineer a protein-derived redox cofactor for catalysis.

Sooim Shin1, Moonsung Choi2, Heather R Williamson1

  • 1Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32827, USA.

Biochimica Et Biophysica Acta
|May 27, 2014
PubMed
Summary

Researchers engineered a 6×-Histidine tag to become a catalytic redox-active center using cobalt. This modified tag successfully substituted for natural cofactors in enzymatic catalysis and mediated electron transfer, showing potential for biotechnology.

Keywords:
BioenergeticsBiotechnologyEnzymeHistidine tagProtein Engineering

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Area of Science:

  • Biochemistry
  • Bioinorganic Chemistry
  • Protein Engineering

Background:

  • The 6×-Histidine tag is widely used for recombinant protein purification.
  • Natural cofactors often contain metal ions and are crucial for enzymatic redox reactions.
  • Engineering proteins to incorporate novel catalytic sites is a key area in biotechnology.

Purpose of the Study:

  • To transform the 6×-Histidine tag into a catalytic redox-active center.
  • To demonstrate the biological activity of the engineered protein-derived cofactor.
  • To explore potential applications in research and biotechnology.

Main Methods:

  • Incorporation of Co(2+) into the 6×-Histidine tag to create a redox-active center.
  • Inactivation of the natural diheme cofactor in MauG.
  • Assessing the catalytic activity of the Co(2+)-loaded 6×His-tag in tryptophan tryptophylquinone biosynthesis using H2O2.
  • Investigating long-range electron transfer by observing the oxidation of a copper site in Cu(1+) amicyanin.

Main Results:

  • The Co(2+)-loaded 6×His-tag successfully substituted for hemes in H2O2-driven catalysis of tryptophan tryptophylquinone biosynthesis.
  • The engineered cofactor mediated long-range electron transfer, oxidizing a copper site 20Å away.
  • Proof of principle for introducing catalytic redox-active sites into proteins.

Conclusions:

  • The 6×-Histidine tag can be engineered into a functional catalytic redox-active center.
  • This approach offers a simple method for creating novel protein-based catalysts.
  • Potential applications in biotechnology and bioengineering are highlighted.