Beta oxidation of octanoyl-CoA to hexanoyl-CoA

The fifth pass through the beta-oxidation spiral picks up where the last left off with the saturated fatty acid octanoyl-CoA and produces hexanoyl-CoA. Four enzymatic steps are required starting with MCAD CoA dehydrogenase (Medium Chain) activity, followed by the enoyl-CoA hydratase activity of crotonase, the 3-hydroxyacyl-CoA dehydrogenase activity of the short chain 3-hydroxyacyl-CoA dehydrogenase (SCHAD), and completed by the ketoacyl-CoA thiolase activity, present in the mitochondrial membrane associated trifunctional protein.

Summary from Reactome (R-HSA-77348), read 2026-09-23.