Catalyzes the phosphorylation and inactivation of the branched-chain alpha-ketoacid dehydrogenase complex, the key regulatory enzyme of the valine, leucine and isoleucine catabolic pathways. Key enzyme that regulate the activity state of the BCKD complex. ATP + L-seryl-[3-methyl-2-oxobutanoate dehydrogenase] = ADP + H(+) + O-phospho-L-seryl-[3-methyl-2-oxobutanoate dehydrogenase] Monomer. Ubiquitous. Autophosphorylated. The disease is caused by variants affecting the gene represented in this entry. A diet enriched in branched amino acids (BCAAs) allows to normalize plasma BCAA levels. This suggests that it may be possible to treat patients with mutations in BCKDK with BCAA supplementation. Belongs to the PDK/BCKDK protein kinase family. The silence within - Issue 147 of March 2013