Which of the following is NOT a function associated with selenoproteins?

Selenoproteins are a diverse group of proteins that incorporate selenium, an essential trace element, and perform various important biological functions. Among these, antioxidant defense and regulation of gene expression are well-documented roles. Selenoproteins like glutathione peroxidases play a critical function in protecting cells from oxidative damage by neutralizing reactive oxygen species. Additionally, certain selenoproteins can influence gene expression by interacting with transcription factors or other cellular signaling pathways.

Detoxification processes also involve selenoproteins, such as thioredoxin reductases, which aid in the reduction of harmful substances within the body. However, while selenoproteins certainly contribute to various metabolic processes, muscle energy production is primarily facilitated by other biological systems, such as those involving carbohydrates, fats, and specific metabolic enzymes rather than being a direct function of selenoproteins.

Therefore, classifying muscle energy production as a function of selenoproteins is not accurate, making it the correct choice for the answer.