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:
““Ego non baptizo te in nomine patris, sed in nomine diaboli!” deliriously howled Ahab, as the malignant iron scorchingly devoured the baptismal blood.”
—Herman Melville (1819–1891)
“Because it is not always easy for an adult to predict what inaccurate ideas a child may have, it can help to answer questions first with one of your own: “What do you think?” Once you find out what a child is really asking, you’ll be in a better position to give a helpful answer based on the facts.”
—Joanna Cole (20th century)