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Cytochromes P450, oxygen, and evolution.

D F Lewis1, G Sheridan

  • 1School of Biomedical and Life Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UK. d.lewis@surrey.ac.uk

Thescientificworldjournal
|June 14, 2003
PubMed
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Cytochrome P450 enzymes evolved with rising oxygen levels, enabling oxidative metabolism. This adaptation showcases how biological systems harnessed oxygen activation for survival over billions of years.

Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Cytochrome P450 (CYP) enzymes are crucial heme-thiolate proteins involved in oxidative metabolism.
  • The evolutionary history of CYPs is intertwined with Earth's changing atmospheric conditions.

Purpose of the Study:

  • To explore the evolutionary role of cytochrome P450 enzymes in relation to atmospheric oxygen.
  • To understand the mechanistic basis of CYP oxygen activation and its biological implications.

Main Methods:

  • Comparative analysis of the cytochrome P450 phylogenetic tree.
  • Correlation with atmospheric oxygen levels and animal phyla emergence timelines.
  • Mechanistic exploration of oxygen activation by P450 monooxygenases.

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Main Results:

  • Concordance observed between increased atmospheric oxygen, CYP gene family expansion, and animal phyla evolution.
  • Detailed mechanistic explanation for the activation of molecular oxygen by P450s.
  • Insights into how biological systems adapted to rising oxygen concentrations.

Conclusions:

  • Cytochrome P450 enzymes played a pivotal role in adapting life to increasing atmospheric oxygen.
  • The unique oxygen-activating capability of P450s has been a key evolutionary innovation.
  • Understanding P450 evolution provides insights into early life and metabolic diversification.