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Engineering substrate recognition in catalysis by cytochrome P450cam.

S G Bell1, X Chen, F Xu

  • 1Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, UK.

Biochemical Society Transactions
|May 30, 2003
PubMed
Summary
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Researchers engineered cytochrome P450cam to transform unnatural substrates, enhancing its use in fine chemical synthesis and bioremediation. Mutants show improved oxidation of chlorinated benzenes and selective oxidation of (+)-alpha-pinene.

Area of Science:

  • Biochemistry
  • Enzyme Engineering
  • Biocatalysis

Background:

  • Cytochrome P450cam (P450cam) is a well-studied enzyme with known substrate recognition mechanisms.
  • Engineering P450cam can lead to novel biocatalysts for synthesizing fine chemicals and remediating environmental pollutants.

Purpose of the Study:

  • To engineer P450cam for enhanced biotransformation of unnatural substrates.
  • To improve oxidation of chlorinated benzenes and selectivity of (+)-alpha-pinene oxidation.
  • To gain structural insights for further enzyme engineering.

Main Methods:

  • Site-directed mutagenesis of P450cam active site.
  • Crystallography to determine enzyme-substrate complex structures.
  • Enzyme activity and selectivity assays.

Related Experiment Videos

Main Results:

  • Designed active-site mutants (F87W/Y96F/V247L) with enhanced activity for chlorinated benzene oxidation.
  • Achieved improved selectivity for (+)-alpha-pinene oxidation.
  • Crystal structures revealed enzyme-substrate contacts, explaining activity and selectivity.

Conclusions:

  • Engineered P450cam exhibits altered substrate specificity and enhanced catalytic activity.
  • Structural data provides a basis for further engineering P450cam for oxidizing highly inert compounds like pentachlorobenzene and hexachlorobenzene.
  • This work advances biocatalysis for chemical synthesis and environmental applications.