Claim: Aquacobalamin reductase, belonging to the family of oxidoreductases (an enzyme that catalyzes the transfer of electrons from one molecule, the reductant, to another, the oxidant), participates in porphyrin and chlorophyll metabolism.
Evidence: This enzyme belongs to the family of oxidoreductases, specifically those oxidizing metal ion with NAD+ or NADP+ as acceptor. In biochemistry, an oxidoreductase is an enzyme that catalyzes the transfer of electrons from one molecule, the reductant, also called the electron donor, to another, the oxidant, also called the electron acceptor. This enzyme participates in porphyrin and chlorophyll metabolism.