Peroxidase

Definition

Peroxidase is an enzyme that catalyzes the oxidation of substrates using hydrogen peroxide. It plays a crucial role in protecting cells from oxidative damage.

5 Must Know Facts For Your Next Test

1. Peroxidases are essential in breaking down hydrogen peroxide, which can be toxic to cells.
2. These enzymes are found in various organisms, including bacteria, plants, and animals.
3. Peroxidases help microbes survive in oxygen-rich environments by neutralizing reactive oxygen species.
4. They are used as a biochemical tool in laboratories for detecting the presence of certain molecules.
5. Different types of peroxidases exist, such as catalase-peroxidase and glutathione peroxidase.

Review Questions

• What is the primary function of peroxidase in microbial cells?
• How do peroxidases contribute to microbial survival in oxygen-rich environments?
• Name two types of peroxidases and their specific roles.

Related terms

Catalase: An enzyme that converts hydrogen peroxide into water and oxygen, protecting cells from oxidative damage.

Glutathione Peroxidase: An enzyme that reduces lipid hydroperoxides to alcohols and free hydrogen peroxide to water.

Reactive Oxygen Species (ROS): Highly reactive chemicals formed from oxygen that can cause damage to DNA, proteins, and cell membranes.