Staphylococcus aureus can degrade exogenous fatty acids through β-oxidation
Cindy Menjivar1, Clarissa Shoffler2, Christopher Petucci2
1Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City, Kansas, USA.
Mbio
|April 20, 2026
Summary
Staphylococcus aureus can degrade exogenous fatty acids using its fatty acid degradation (Fad) pathway. This study demonstrates the Fad pathway
Area of Science:
- Microbiology
- Biochemistry
- Molecular Biology
Background:
- Staphylococcus aureus possesses genes for fatty acid degradation (Fad) but its functionality was unconfirmed.
- Previous studies identified acyl-CoA formation but not fatty acid breakdown.
- The fadXDEBA operon contains large intergenic regions potentially hindering function.
Purpose of the Study:
- To investigate the functional capacity of the Staphylococcus aureus fatty acid degradation (Fad) pathway.
- To determine if the identified fadXDEBA operon can degrade exogenous fatty acids.
- To explore the role of intergenic regions in regulating Fad pathway activity.
Main Methods:
- Generated a Staphylococcus aureus strain with deleted intergenic regions within the fadXDEBA operon.
- Utilized mass spectrometry to analyze fatty acid degradation products.
- Compared degradation products in the modified strain versus a fadXDEBA mutant.
Main Results:
- Detected degradation products of palmitic and oleic acids in the modified S. aureus strain.
- Confirmed the absence of these degradation products in the fadXDEBA mutant.
- Demonstrated that the S. aureus Fad pathway is functional and degrades exogenous fatty acids.
Conclusions:
- The Staphylococcus aureus fatty acid degradation (Fad) pathway is functional.
- The bacterium can metabolize exogenous saturated and unsaturated fatty acids.
- This finding reveals a second pathway for exogenous fatty acid utilization in S. aureus.
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