NAD-dependent protein lipoamidase sirtuin-4, mitochondrial (SIRT4)

Acts as NAD-dependent protein lipoamidase, ADP-ribosyl transferase and deacetylase. Catalyzes more efficiently removal of lipoyl- and - biotinyl- than acetyl-lysine modifications.

Inhibits the pyruvate dehydrogenase complex (PDH) activity through the enzymatic hydrolysis of the lipoamide cofactor from the E2 component, DLAT, in a phosphorylation-independent manner (PubMed:25525879). Catalyzes the transfer of ADP-ribosyl groups onto target proteins, including mitochondrial GLUD1, inhibiting GLUD1 enzyme activity.