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Functional evolution and structural conservation in chimeric cytochromes p450: calibrating a structure-guided

Christopher R Otey1, Jonathan J Silberg, Christopher A Voigt

  • 1Biochemistry and Molecular Biophysics Option, Mail Code 210-41, Pasadena, CA 91125, USA.

Chemistry & Biology
|May 5, 2004
PubMed
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SCHEMA-guided recombination of cytochrome P450s (CYP102) creates functional protein chimeras. This method generates diverse enzymes with altered activities and substrate specificities, aiding the study of protein evolution.

Area of Science:

  • Protein Engineering
  • Enzymology
  • Molecular Evolution

Background:

  • Protein recombination can yield chimeric proteins with novel or parental functions.
  • Cytochrome P450s (CYP102) are a functionally diverse enzyme family.
  • Protein folding of chimeras depends on minimizing structural disruptions from parental sequence inheritance.

Purpose of the Study:

  • To generate and characterize chimeric cytochrome P450s using SCHEMA-guided recombination.
  • To explore the functional diversity and evolutionary potential of these engineered proteins.

Main Methods:

  • Seventeen chimeric proteins were created from two CYP102 members.
  • The SCHEMA algorithm was used to predict and select chimeras with minimal structural disruption.
  • Characterization included CO binding spectra, substrate specificity, thermostability, and peroxidase activity assays.

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Main Results:

  • Chimeras predicted by SCHEMA exhibited folded P450 CO binding spectra.
  • Significant functional diversity was observed, including altered substrate specificities and a wide range of thermostabilities.
  • Peroxidase activity increased up to 40-fold, and one chimera hydroxylated a novel substrate.

Conclusions:

  • SCHEMA-guided recombination is effective in generating diverse cytochrome P450 variants.
  • This approach facilitates the exploration of enzyme function evolution within the P450 structural framework.
  • Engineered chimeras can display unique enzymatic properties not found in parent proteins.