This family represents a small domain of the E2 subunit of 2-oxo-acid dehydrogenases responsible for the binding of the E3 subunit.

1: Protein-protein interactions in the pyruvate dehydrogenase multienzyme complex: dihydrolipoamide dehydrogenase complexed with the binding domain of dihydrolipoamide acetyltransferase. Mande SS, Sarfaty S, Allen MD, Perham RN, Hol WG; Structure 1996;4:277-286. PMID:8805537