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Related Concept Videos

Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

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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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Functional Characterization of Allelic Variations of Human Cytochrome P450 2C8 (V181I, I244V, I331T, and L361F).

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Structure-Functional Analysis of Human Cytochrome P450 2C8 Using Directed Evolution.

Rowoon Lee1, Vitchan Kim1, Youngjin Chun2

  • 1Department of Biological Sciences, Konkuk University, Seoul 05029, Korea.

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Directed evolution enhanced cytochrome P450 2C8 (CYP2C8) activity. Mutants showed significantly increased catalytic efficiency for paclitaxel and arachidonic acid metabolism.

Keywords:
CYP2C8P450arachidonic aciddirected evolutionluciferinmass spectrometrypaclitaxel

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Area of Science:

  • Biochemistry and Molecular Biology
  • Enzymology
  • Drug Metabolism

Background:

  • Cytochrome P450 2C8 (CYP2C8) is a key human enzyme involved in drug metabolism.
  • CYP2C8 is known for its susceptibility to drug-drug interactions and genetic polymorphisms.
  • Understanding CYP2C8's structure-function relationship is crucial for predicting drug responses.

Purpose of the Study:

  • To investigate the structure-functional complexity of CYP2C8.
  • To enhance CYP2C8's catalytic activity using directed evolution.
  • To characterize the kinetic and binding properties of engineered CYP2C8 variants.

Main Methods:

  • Employed directed evolution, including random mutagenesis and screening with 6-methoxy-luciferin.
  • Expressed and purified wild-type and mutant CYP2C8 enzymes.
  • Performed steady-state kinetic analyses and substrate-binding titration experiments.

Main Results:

  • Identified two CYP2C8 mutants (D349Y and D349Y/V237A) with significantly enhanced luciferase activity.
  • Mutants displayed 5-7 fold higher kcat and 3-5 fold increased catalytic efficiency for paclitaxel 6α-hydroxylation.
  • Mutants showed 30-150 fold higher kcat and 40-110 fold increased catalytic efficiency for arachidonic acid epoxidation.
  • The V237A mutation resulted in tighter substrate binding affinity.
  • Structural analysis suggested improved P450 coupling efficiency or electron transfer due to D349Y mutation.

Conclusions:

  • Directed evolution is effective in enhancing CYP2C8's catalytic function.
  • Specific mutations (D349Y, V237A) significantly improve enzyme activity and substrate binding.
  • Enhanced CYP2C8 variants offer valuable tools for studying drug metabolism and interactions.