Redox enzymes classification

Reflecting the lack of in-depth experimental data available at this time, even the classiflcation of metal-dependent enzymes was notably nonsystematic. In an early review, five categories were set forth heme, copper-containing, proteolytic, carbonic anhydrase, and phosphatase . A later classification" was made according to the types of reactions catalyzed electron transfer or redox (Cu, Fe, Mo), group transfer (Mg, Mn), decarboxylations and hydrolyses (Mn, Zn), and binding of pyridine nucleotide cofactors (Zn). 

---