Iron Based
There are several types of iron based enzymes. Cytochrome cd1, or Pseudomonas cytochrome oxidase contains two c and two d type hemes with two polypeptide chains. Different forms of this reductase catalyze the formation of nitric oxide or nitrous oxide. A version of this compound was originally called . It was initially considered an oxidase. It catalyzes the reduction of NO2- to NO. This tetraheme enzyme has two subunits, each containing a c-type and a d-type heme. The reduced d hemes bind nitrite and convert it to product.
Cytochrome c nitrite reductase (ccNIR) is a multiheme enzyme that converts nitrite to ammonia on each active site. The active site iron is bound to a protoporphyrin IX ring that is covalently linked to the enzyme's proteins.
Read more about this topic: Nitrite Reductase
Famous quotes containing the words iron and/or based:
“It was then that the iron entered my soul.”
—Margaret Thatcher (b. 1925)
“That’s my problem, chaplain: I’m yellow. PFC Bernstein—plumb, fat coward. Hey, can you get a Section 8 for being yellow?”
—James Poe, U.S. screenwriter, and Based On Play. Robert Aldrich. Bernstein (Robert Strauss)