Enzyme Transketolase requires –
**Core Concept**
The **Transketolase** enzyme plays a crucial role in the **Pentose Phosphate Pathway**, which is vital for generating **NADPH** and **pentoses** from **hexoses**. This pathway is significant in tissues involved in lipid synthesis, such as the liver, adipose tissue, and lactating mammary gland.
**Why the Correct Answer is Right**
**Transketolase** requires **Thiamine Pyrophosphate (TPP)** as a coenzyme to function properly. TPP is derived from **Vitamin B1 (Thiamine)**. The enzyme catalyzes the transfer of a two-carbon fragment from one sugar to another, facilitating the interconversion of sugars in the pentose phosphate pathway.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because, although important in various biochemical pathways, it is not directly related to Transketolase's function.
**Option B:** Incorrect as it is not the specific coenzyme required by Transketolase.
**Option C:** Incorrect because, while important for other enzymatic reactions, it is not the coenzyme for Transketolase.
**Clinical Pearl / High-Yield Fact**
A classic clinical correlation is that a deficiency in **Thiamine** leads to **Beriberi** and **Wernicke-Korsakoff syndrome**, highlighting the importance of Thiamine in neural function and carbohydrate metabolism.
**Correct Answer:** D. Thiamine Pyrophosphate.