Mitochondrial uncoupling protein 3 (UCP3)

Mitochondrial uncoupling protein 3 (UCP3) is a member of the mitochondrial anion carrier protein family mainly expressed in skeletal muscle, brown adipose tissue, and the heart[1][4]. It is encoded by the *UCP3* gene and localizes to the inner mitochondrial membrane. UCP3 facilitates the transmembrane transport of protons and metabolites, thus uncoupling oxidative phosphorylation from ATP synthesis and promoting energy dissipation as heat. This process plays a regulatory role in energy metabolism, thermogenesis, fatty acid metabolism, and protection against reactive oxygen species. UCP3’s precise physiological function remains uncertain, but it is implicated in the regulation of fat metabolism, glucose handling, and the cellular response to metabolic stress, including its potential roles in obesity, diabetes, and cardiovascular disease[1][4][2][5]. There are currently no approved drugs that specifically target UCP3, although its modulation is considered an attractive option for metabolic disease intervention.

Other names

Uncoupling protein 3SLC25A9uncoupling protein 3 (mitochondrial, proton carrier)

Proposed mechanisms include uncoupling mitochondrial oxidative phosphorylation (disrupting ATP synthesis), modulating fatty acid metabolism, and reducing mitochondrial ROS[1][4][5].