Sulfite oxidase
（重定向自Sulphite oxidase）
![](/Images/godic/202502/14/PDB_1mj4_EBI2621.jpg")
![A proposed mechanism of the oxidation of sulfite to sulfate by sulfite oxidase.](/Images/godic/202502/14/Sulfite-oxidase-mechanism2621.png")
Sulfite oxidase (EC1.8.3.1) is an enzyme in the mitochondria of all eukaryotes. It oxidizes sulfite to sulfate and, via cytochrome c, transfers the electrons produced to the electron transport chain, allowing generation of ATP in oxidative phosphorylation. This is the last step in the metabolism of sulfur-containing compounds and the sulfate is excreted.