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Related Concept Videos

Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.

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Related Experiment Video

Updated: May 7, 2026

Light-driven Enzymatic Decarboxylation
09:58

Light-driven Enzymatic Decarboxylation

Published on: May 22, 2016

An efficient light-driven P450 BM3 biocatalyst.

Ngoc-Han Tran1, Daniel Nguyen, Sudharsan Dwaraknath

  • 1Department of Chemistry, San José State University , One Washington Square, San José, California 95192-0101, United States.

Journal of the American Chemical Society
|September 18, 2013
PubMed
Summary

Researchers created hybrid enzymes combining P450 BM3 heme domains with a ruthenium photosensitizer. This innovation enables light-driven P450 reactions, bypassing the need for reductase enzymes and improving catalytic efficiency for C-H bond functionalization.

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Area of Science:

  • Biochemistry and Biotechnology
  • Enzyme Engineering
  • Photocatalysis

Background:

  • Cytochrome P450 enzymes (P450s) are crucial heme thiolate enzymes for C-H bond functionalization.
  • Traditional P450 catalysis relies on reductase enzymes for electron transfer, limiting their application scope.
  • Developing reductase-independent P450 systems is essential for broader biocatalytic applications.

Purpose of the Study:

  • To engineer hybrid P450 BM3 heme domains capable of performing catalytic reactions using visible light.
  • To circumvent the requirement for reductase enzymes in P450-mediated functionalization reactions.
  • To enhance enzyme stability and catalytic efficiency through photosensitizer integration.

Main Methods:

  • Construction of hybrid enzymes by covalently attaching a Ruthenium(II) photosensitizer to P450 BM3 heme domains.
  • Visible light irradiation to drive catalytic P450 reactions, specifically hydroxylation.
  • Characterization of enzyme activity, stability, and turnover numbers for light-driven catalysis.

Main Results:

  • A highly active and stable hybrid enzyme was successfully developed.
  • The engineered enzyme efficiently catalyzed the light-driven hydroxylation of lauric acid.
  • Achieved total turnover numbers of 935 and an initial reaction rate of 125 mol product/(mol enzyme/min).

Conclusions:

  • Hybrid P450 enzymes incorporating photosensitizers offer a promising avenue for reductase-independent biocatalysis.
  • Visible light irradiation can effectively drive P450-catalyzed C-H functionalization, expanding catalytic possibilities.
  • The developed hybrid enzyme demonstrates significant potential for industrial applications in selective oxidation reactions.