Lipoate--protein ligase 1

UniProtKB accession:  Q8IEG9

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Catalyzes both the ATP-dependent activation of exogenously supplied lipoate to lipoyl-AMP and the transfer of the activated lipoyl onto the lipoyl domains of lipoate-dependent enzymes (PubMed:17244193, PubMed:25116855, PubMed:28543853). In the mitochondrion, functions as a redox switch between two lipoylation routes (PubMed:25116855). Senses the oxidation state of lipoate and determines which downstream enzymes will be lipoylated (PubMed:25116855). In low reducing conditions, uses lipoate in its oxidized ring form to lipoylate glycine cleavage system H-protein GCVH (PubMed:17244193, PubMed:25116855, PubMed:28543853). In high reducing conditions and together with LipL2, uses reduced lipoate (dihydrolipoate) to lipoylate the E2 component of the branched chain alpha-ketoacid dehydrogenase complex BCKDH-E2/BCDH and the E2 component of the alpha-ketoglutarate dehydrogenase complex KDH. LipL1 is responsible for catalysing the activation of lipoate, forming lipoyl-AMP while LipL2 is required but is not capable of catalyzing this reaction (PubMed:17244193, PubMed:25116855).