Which vitamin is required for glucose 6 phosphate dehydrogenase?
**Core Concept**
Glucose-6-phosphate dehydrogenase (G6PD) is an enzyme that plays a crucial role in the pentose phosphate pathway, which generates NADPH and pentoses from glucose-6-phosphate. This enzyme is essential for protecting erythrocytes from oxidative damage caused by reactive oxygen species.
**Why the Correct Answer is Right**
The correct answer is NADP (Nicotinamide adenine dinucleotide phosphate). NADP is a crucial co-factor for G6PD, allowing it to catalyze the conversion of glucose-6-phosphate to 6-phosphogluconate, generating NADPH in the process. This pathway is vital for maintaining the balance of reducing equivalents in cells and protecting against oxidative stress.
**Why Each Wrong Option is Incorrect**
* **Option A:** Riboflavin (Vitamin B2) is a precursor to FAD, which is involved in various redox reactions but is not directly related to G6PD activity.
* **Option B:** Pantothenic acid (Vitamin B5) is a component of CoA, which is involved in fatty acid synthesis and beta-oxidation, but it is not directly involved in the pentose phosphate pathway.
* **Option C:** Biotin is a co-factor for carboxylase enzymes involved in fatty acid synthesis and gluconeogenesis, but it is not directly related to G6PD activity.
**Clinical Pearl / High-Yield Fact**
Glucose-6-phosphate dehydrogenase deficiency is a hereditary condition that affects red blood cells, leading to hemolytic anemia in response to oxidative stress caused by certain medications, infections, or foods. Patients with G6PD deficiency should avoid triggers like fava beans, certain medications (e.g., sulfonamides), and infections (e.g., malaria).
**Correct Answer: D. NADP**