Fatty acid beta-oxidation pathway enzymes (FAO enzymes)

The fatty acid beta-oxidation (FAO) pathway enzymes are a group of mitochondrial and peroxisomal proteins responsible for the sequential breakdown of fatty acids into acetyl-CoA (StatPearls, 2023). This process is a primary source of energy for high-demand tissues like the heart and skeletal muscle, especially during fasting or prolonged exercise (NIH, 2022). Key enzymes in this pathway include acyl-CoA dehydrogenases, enoyl-CoA hydratase, 3-hydroxyacyl-CoA dehydrogenase, and 3-ketoacyl-CoA thiolase (UniProt, 2024). In clinical medicine, these enzymes are targeted to treat ischemic heart diseases, such as angina, by shifting myocardial metabolism from fatty acids to glucose, which requires less oxygen per mole of ATP produced (PubMed, 2018). Conversely, genetic deficiencies in these enzymes, such as Medium-chain acyl-CoA dehydrogenase deficiency (MCADD), lead to severe metabolic crises characterized by hypoketotic hypoglycemia (MedlinePlus, 2021). Emerging research also explores the inhibition of FAO enzymes as a strategy to limit the energy supply of certain cancer cells that rely on lipid metabolism for survival and metastasis (Nature Reviews Cancer, 2020). Pharmacological agents like trimetazidine and ranolazine act by inhibiting specific steps in this pathway to improve cardiac efficiency (PubChem, 2024).

Other names

Fatty acid oxidation enzymesMitochondrial beta-oxidation pathwayFAO pathwayBeta-oxidation enzymes

Inhibition of specific enzymes within the fatty acid beta-oxidation cycle (e.g., 3-ketoacyl-CoA thiolase or carnitine palmitoyltransferase) to shift cellular metabolism from fatty acids to glucose oxidation, thereby improving oxygen efficiency in ATP production (PubMed, 2018; StatPearls, 2023).