Enables ATP binding activity; [3-methyl-2-oxobutanoate dehydrogenase (acetyl-transferring)] kinase activity; and protein serine/threonine kinase activity. Involved in branched-chain amino acid catabolic process; phosphorylation; and spermatogenesis. Part of mitochondrial alpha-ketoglutarate dehydrogenase complex. Used to study branched-chain keto acid dehydrogenase kinase deficiency and oligospermia. Human ortholog(s) of this gene implicated in branched-chain keto acid dehydrogenase kinase deficiency. Orthologous to human BCKDK (branched chain keto acid dehydrogenase kinase). [provided by Alliance of Genome Resources, Apr 2022]