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A radical approach to enzyme catalysis

E N Marsh1

  • 1Cambridge Centre for Molecular Recognition, UK.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|May 1, 1995
PubMed
Summary

Enzymes utilize carbon-based radicals for crucial biological reactions like DNA synthesis, overcoming challenges in aerobic environments. These enzymes employ stable protein radicals to facilitate radical generation, catalysis, and storage.

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Area of Science:

  • Biochemistry and enzymology
  • Organic chemistry
  • Molecular biology

Background:

  • Free radicals are typically viewed as harmful to biological systems due to their high reactivity.
  • However, certain enzymes harness carbon-based radicals to catalyze essential and uncommon reactions.

Purpose of the Study:

  • To explore the role of enzymes in utilizing and generating carbon-based radicals.
  • To understand the mechanisms enzymes employ to manage radicals in aerobic conditions.
  • To investigate the function of stable protein-based radicals in enzymatic catalysis.

Main Methods:

  • Analysis of enzymatic mechanisms involving radical intermediates.
  • Investigation of radical generation and stabilization strategies in enzymes.
  • Characterization of protein-based radicals in enzyme active sites.

Main Results:

  • Enzymes, such as ribonucleotide reductase (essential for DNA synthesis), use radicals to activate substrates by abstracting hydrogen from unreactive positions.
  • Diverse enzymatic mechanisms have evolved to generate and maintain radicals, even in oxygen-rich environments.
  • Stable protein-based radicals, located on amino acid side chains, act as crucial links between radical-generating and catalytic sites and store radicals between reaction cycles.

Conclusions:

  • Enzymes have evolved sophisticated strategies to utilize reactive radical species for catalysis.
  • The discovery of stable protein-based radicals highlights novel mechanisms for radical management in biological systems.
  • These findings expand our understanding of enzymatic catalysis and radical biochemistry.

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