Cytochrome oxidase

Definition

Cytochrome oxidase is an enzyme found in the mitochondria that plays a key role in the electron transport chain by facilitating the transfer of electrons to oxygen. This process is crucial for the production of ATP during cellular respiration.

5 Must Know Facts For Your Next Test

1. Cytochrome oxidase is a part of Complex IV in the electron transport chain.
2. It catalyzes the reduction of oxygen to water, which is essential for aerobic respiration.
3. The enzyme contains heme groups and copper ions that are critical for its function.
4. Inhibition of cytochrome oxidase can lead to cellular energy deficits and has been linked to certain toxins like cyanide.
5. It helps maintain the proton gradient across the inner mitochondrial membrane, driving ATP synthesis.

Review Questions

• What role does cytochrome oxidase play in the electron transport chain?
• Which elements within cytochrome oxidase are essential for its catalytic activity?
• How does inhibition of cytochrome oxidase affect cellular respiration?

Related terms

Electron Transport Chain:

A series of protein complexes that transfer electrons through a membrane within mitochondria to form a gradient of protons.

ATP Synthase:

An enzyme that creates ATP by using the proton gradient established by the electron transport chain.

Aerobic Respiration:

A type of cellular respiration that uses oxygen as the final electron acceptor in the electron transport chain.