Fatty acid beta-oxidation enzymes (FAO enzymes)

Fatty acid beta-oxidation enzymes are a group of mitochondrial and peroxisomal proteins that catalyze the multi-step process of breaking down fatty acid chains into acetyl-CoA, NADH, and FADH2 (StatPearls: https://www.ncbi.nlm.nih.gov/books/NBK556002/). This pathway is the primary energy source for the heart and resting skeletal muscle, providing high yields of ATP (UniProt: https://www.uniprot.org/locations/SL-0121). In cardiovascular diseases like chronic angina, pharmacological inhibition of these enzymes—specifically long-chain 3-ketoacyl-CoA thiolase—shifts the myocardial metabolism toward glucose oxidation, which requires less oxygen per mole of ATP produced (PubMed: https://pubmed.ncbi.nlm.nih.gov/11588117/). This metabolic switch helps protect the heart from ischemic injury and improves functional capacity in patients with heart failure (PubMed: https://pubmed.ncbi.nlm.nih.gov/16412087/). Beyond cardiology, genetic deficiencies in specific enzymes like medium-chain acyl-CoA dehydrogenase (MCAD) lead to severe metabolic disorders characterized by the inability to utilize fat stores during fasting (NIH: https://medlineplus.gov/genetics/condition/medium-chain-acyl-coa-dehydrogenase-deficiency/). Emerging research also explores these enzymes as targets in oncology, as many cancer cells upregulate fatty acid oxidation to support proliferation and survival under metabolic stress (PubMed: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7464933/). Therapeutic agents targeting this pathway include trimetazidine and ranolazine, which are used to manage stable angina by optimizing cardiac energy substrate utilization (StatPearls: https://www.ncbi.nlm.nih.gov/books/NBK559234/).

Other names

Beta-oxidation pathway enzymesMitochondrial beta-oxidation enzymesFatty acid oxidation enzymesFAO enzymes

Inhibition of specific enzymes within the beta-oxidation cycle, such as long-chain 3-ketoacyl-CoA thiolase (3-KAT) or carnitine palmitoyltransferase 1 (CPT1), to shift cellular metabolism from fatty acid oxidation to glucose oxidation.