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Butane and propane oxidation by engineered cytochrome P450cam
Stephen G Bell1, Julie-Anne Stevenson, Helen D Boyd
1Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, UK OX1 3QR.
Chemical Communications (Cambridge, England)
|July 18, 2002
Summary
Engineered cytochrome P450cam enzymes can now efficiently oxidize gaseous alkanes like butane and propane into alcohols. This breakthrough enhances enzymatic activity and substrate specificity for industrial applications.
Area of Science:
- Biocatalysis
- Enzyme Engineering
- Organic Chemistry
Background:
- Cytochrome P450cam is a haem monooxygenase.
- Wild-type P450cam has limited activity and yield for alkane oxidation.
- Engineering enzymes can improve substrate specificity and catalytic efficiency.
Purpose of the Study:
- To engineer cytochrome P450cam for efficient oxidation of gaseous alkanes.
- To improve enzyme-substrate fit by reducing substrate pocket volume.
- To enhance catalytic turnover rate and product yield.
Main Methods:
- Utilizing bulky amino acid substitutions in the P450cam active site.
- Introducing mutations F87W/Y96F/T101L/V247L.
- Measuring enzyme activity and product yield for butane oxidation.
Main Results:
- The F87W/Y96F/T101L/V247L mutant exhibited a turnover rate of 750 min-1 for butane oxidation.
- The engineered mutant achieved a 95% yield based on NADH consumed.
- Wild-type P450cam showed significantly lower activity (0.4 min-1) and yield (4%).
Conclusions:
- Engineered P450cam demonstrates significantly enhanced activity and selectivity for alkane oxidation.
- Bulky amino acid substitutions effectively improve enzyme-substrate fit and catalytic performance.
- This engineered enzyme holds potential for industrial biocatalytic applications.