Quantitative whole-cell cytochrome P450 measurement suitable for high-throughput application

Area of Science:

• Biochemistry
• Biotechnology
• Pharmacology

Background:

• Cytochrome P450 enzymes are crucial for drug metabolism, with recombinant expression vital for pharmaceutical and biotech industries.
• Current quantification methods require cell disruption, hindering high-throughput analysis, especially for low-expression P450s.
• Existing whole-cell spectral methods suffer from poor reproducibility and low signal-to-noise ratios, often obscured by bacterial hemoproteins.

Purpose of the Study:

• To develop a reproducible whole-cell spectral method for quantifying cytochrome P450 (P450) enzymes in bacterial cultures.
• To overcome limitations of existing methods, particularly for low P450 expression levels and interference from bacterial hemoproteins.
• To establish a high-throughput compatible method for measuring P450 expression without cell processing.

Main Methods:

• Concentrating bacterial cultures.
• Incubating cultures under microaerobic conditions.
• Employing a modified baseline correction method for spectral analysis of whole cells.

Main Results:

• Achieved reproducible quantification of P450s in whole bacterial cells.
• Overcame interference from bacterial hemoproteins, improving signal clarity.
• Demonstrated suitability for high-throughput applications, allowing parallel expression and measurement of enzyme libraries.

Conclusions:

• The developed whole-cell method enables accurate and reproducible P450 quantification.
• This approach simplifies the process by eliminating the need for cell disruption and fractionation.
• The method is well-suited for high-throughput screening of recombinant P450 enzymes in pharmaceutical and biotechnological research.