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A shuffled CYP1A library shows both structural integrity and functional diversity.

Wayne A Johnston1, Weiliang Huang, James J De Voss

  • 1Physiology and Pharmacology, School of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, Australia.

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Summary

Re-engineered cytochrome P450 enzymes (P450s) show enhanced activity and novel functions for industrial biocatalysis. DNA shuffling created diverse P450 variants with improved metabolic capabilities.

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Area of Science:

  • Biocatalysis and enzyme engineering
  • Drug metabolism and pharmacokinetics
  • Molecular biology and genetic engineering

Background:

  • Mammalian cytochrome P450 enzymes (P450s) are crucial for xenobiotic metabolism.
  • These enzymes exhibit broad substrate ranges but often have low catalytic efficiency.
  • Re-engineering P450s offers potential for developing industrial biocatalysts.

Purpose of the Study:

  • To engineer human CYP1A1 and CYP1A2 enzymes for improved industrial applications.
  • To create a library of P450 variants using DNA family shuffling.
  • To characterize the functional diversity and activity profiles of the engineered P450s.

Main Methods:

  • Restriction enzyme-mediated DNA family shuffling was employed to generate a mutant library from human CYP1A1 and CYP1A2.
  • Sequencing and analysis of selected clones to identify crossovers and spontaneous mutations.
  • Whole-cell metabolic assays were utilized to screen for enzymatic activity on various substrates.

Main Results:

  • A library of P450 variants was successfully created with an average of 5.9 crossovers and 1.5 mutations per mutant.
  • 53% of clones expressed at significant levels (>50 nM), and 23% exhibited activity on tested compounds.
  • Engineered variants displayed enhanced specific activity, novel substrate specificities, and broadened substrate ranges compared to wild-type enzymes.

Conclusions:

  • DNA family shuffling is an effective method for generating diverse and functional P450 variants.
  • Engineered P450s demonstrate distinct and novel activity profiles, highlighting their potential as industrial biocatalysts.
  • High-throughput whole-cell assays facilitate efficient screening of large enzyme libraries.