Lipoyltransferase 1, mitochondrial (LIPT1)

Lipoyltransferase 1, mitochondrial (LIPT1), is an essential mitochondrial enzyme responsible for transferring the lipoyl group from the glycine cleavage system H protein to the E2 subunits of 2-oxoacid dehydrogenase complexes, such as pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase, a critical process for mitochondrial energy metabolism[2][6][7]. LIPT1 is required for the proper function of these enzyme complexes and, thus, for aerobic respiration and amino acid degradation[2]. Genetic defects in LIPT1 cause a severe neurometabolic disorder marked by absent mitochondrial protein lipoylation, profound lactic acidosis, neurodevelopmental impairment, and often early death[4][6]. Beyond rare genetic disease, LIPT1 is downregulated in some cancers, and its expression correlates with processes such as immune cell infiltration, cell cycle regulation, and apoptosis; its activity or dysregulation is under study as both a prognostic biomarker and possible therapeutic intervention point in oncology[1]. No direct inhibitors or marketed drugs act on LIPT1, but experimental therapies to restore mitochondrial function in deficiency include combinations of metabolic cofactors and antioxidants[4].

Other names

Lipoyl amidotransferase LIPT1, mitochondrialLipoyl ligaseLipoate biosynthesis proteinLipoate-protein ligaseMGC12290MGC13378LIPT1D

Restoration of mitochondrial protein lipoylation/energy metabolism by bypassing or boosting defective LIPT1 enzymatic function[4]; Activation of SIRT3 signaling to restore mitochondrial homeostasis[4]