Glutathione reductase contains the following prosthetic group:
**Core Concept**
Glutathione reductase is an enzyme involved in the reduction of glutathione disulfide (GSSG) to its reduced form (GSH), playing a crucial role in maintaining the cellular redox balance and protecting against oxidative stress. This enzyme is a flavoprotein, which implies it contains a prosthetic group that facilitates its catalytic activity.
**Why the Correct Answer is Right**
The correct prosthetic group of glutathione reductase is **FAD (Flavin Adenine Dinucleotide)**. This prosthetic group is essential for the enzyme's catalytic activity, as it undergoes a series of redox reactions that ultimately reduce GSSG to GSH. FAD is a derivative of riboflavin (vitamin B2) and is a key component of various flavoproteins involved in redox reactions.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely incorrect as the prosthetic group of glutathione reductase is not a heme group.
**Option B:** This option is incorrect as the prosthetic group of glutathione reductase is not a pterin.
**Option C:** This option is incorrect as the prosthetic group of glutathione reductase is not a lipoic acid.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that glutathione reductase is a flavoprotein, and its prosthetic group, FAD, is vital for its catalytic activity. This is crucial in understanding the enzyme's role in maintaining cellular redox balance and its implications in various diseases.
**Correct Answer: C. FAD (Flavin Adenine Dinucleotide)**