Enzyme responsible for respiratory burst is:
**Core Concept**
The respiratory burst is an important cellular response that involves the rapid production of reactive oxygen species (ROS) in phagocytic cells, such as neutrophils and macrophages. This process is crucial for the elimination of pathogens and foreign particles. The enzyme responsible for initiating this process is a key player in the innate immune response.
**Why the Correct Answer is Right**
The enzyme responsible for respiratory burst is NADPH oxidase. This enzyme catalyzes the transfer of electrons from NADPH to molecular oxygen, resulting in the production of superoxide (O2-), a highly reactive ROS. The superoxide is then converted to other ROS, such as hydrogen peroxide (H2O2) and hydroxyl radicals (OH-), which are toxic to pathogens. NADPH oxidase is a multi-subunit enzyme that consists of several components, including gp91phox, p22phox, p47phox, p67phox, and p40phox. The assembly of these subunits at the phagosome membrane is essential for the activation of the enzyme.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is not a known enzyme involved in the respiratory burst.
* **Option B:** This option is incorrect because it is a enzyme involved in glycolysis, not the respiratory burst.
* **Option C:** This option is incorrect because it is an enzyme involved in fatty acid oxidation, not the respiratory burst.
**Clinical Pearl / High-Yield Fact**
The respiratory burst is a critical component of the innate immune response, and defects in NADPH oxidase, such as chronic granulomatous disease (CGD), can lead to recurrent infections and granulomatous disease.
**Correct Answer:** C. NADPH oxidase.