A metalloenzyme is a type of enzyme that contains one or more metal ions as part of its structure. These metal ions, such as zinc, iron, or copper, play a crucial role in the enzyme's catalytic activity, helping to facilitate biochemical reactions. The presence of metal ions can enhance the enzyme's stability and influence its ability to bind to substrates. Metalloenzymes are involved in various biological processes, including DNA synthesis, oxygen transport, and oxidation-reduction reactions. They are essential for the proper functioning of many metabolic pathways in living organisms. Understanding metalloenzymes can provide insights into their roles in health and disease.