UCP3

Putative transmembrane transporter that plays a role in mitochondrial metabolism via an as yet unclear mechanism. Originally, this mitochondrial protein was thought to act as a proton transmembrane transporter from the mitochondrial intermembrane space into the matrix, causing proton leaks through the inner mitochondrial membrane, thereby uncoupling mitochondrial membrane potential generation from ATP synthesis. However, this function is controversial and uncoupling may not be the function, or at least not the main function, but rather a consequence of more conventional metabolite transporter activity..

Function from UniProtKB (P55916), read 2026-09-23. CC BY 4.0.