Protein present in brown adipose tissue is –
**Core Concept**
Brown adipose tissue (BAT) is a highly specialized form of fat tissue that plays a crucial role in thermogenesis and energy expenditure. The protein present in BAT is responsible for its unique metabolic properties. This protein is involved in the uncoupling of oxidative phosphorylation, allowing BAT to generate heat without producing ATP.
**Why the Correct Answer is Right**
The correct protein present in BAT is **UCP1 (Uncoupling Protein 1)**. UCP1 is a mitochondrial inner membrane protein that allows protons to leak back across the inner mitochondrial membrane, thereby preventing the generation of ATP during oxidative phosphorylation. This process is known as mitochondrial uncoupling. UCP1 is highly expressed in BAT and is responsible for its ability to generate heat and increase energy expenditure.
**Why Each Wrong Option is Incorrect**
* **Option A:** **HSP60** is a mitochondrial chaperone protein involved in protein folding and transport, but it is not specifically associated with BAT or thermogenesis.
* **Option B:** **CPT1 (Carnitine Palmitoyltransferase 1)** is an enzyme involved in the transport of long-chain fatty acids into mitochondria, but it is not the protein responsible for the unique metabolic properties of BAT.
* **Option C:** **PPARγ (Peroxisome Proliferator-Activated Receptor Gamma)** is a nuclear receptor involved in the regulation of glucose and lipid metabolism, but it is not a protein present in BAT.
**Clinical Pearl / High-Yield Fact**
The activation of UCP1 in BAT is a key mechanism by which certain medications, such as beta-3 adrenergic agonists, can increase energy expenditure and potentially treat obesity and metabolic disorders.
**Correct Answer:** C. UCP1 (Uncoupling Protein 1)