Dihydrolipoamide succinyltransferase (E2) component of the 2-oxoglutarate dehydrogenase complex. The 2-oxoglutarate dehydrogenase complex catalyzes the overall conversion of 2-oxoglutarate to succinyl-CoA and CO(2). The 2-oxoglutarate dehydrogenase complex is mainly active in the mitochondrion (PubMed:29211711, PubMed:30929736). A fraction of the 2-oxoglutarate dehydrogenase complex also localizes in the nucleus and is required for lysine succinylation of histones: associates with KAT2A on chromatin and provides succinyl-CoA to histone succinyltransferase KAT2A (PubMed:29211711). (R)-N(6)-dihydrolipoyl-L-lysyl-[2-oxoglutarate dehydrogenase complex component E2] + succinyl-CoA = (R)-N(6)-(S(8)-succinyldihydrolipoyl)-L-lysyl-[2-oxoglutarate dehydrogenase complex component E2] + CoA Binds 1 lipoyl cofactor covalently. Amino-acid degradation; L-lysine degradation via saccharopine pathway; glutaryl-CoA from L-lysine: step 6/6. Carbohydrate metabolism; tricarboxylic acid cycle. The 2-oxoglutarate dehydrogenase complex is composed of OGDH (2-oxoglutarate dehydrogenase; E1), DLST (dihydrolipoamide succinyltransferase; E2) and DLD (dihydrolipoamide dehydrogenase; E3). It contains multiple copies of the three enzymatic components (E1, E2 and E3). In the nucleus, the 2-oxoglutarate dehydrogenase complex associates with KAT2A (PubMed:29211711). Mainly localizes in the mitochondrion. A small fraction localizes to the nucleus, where the 2-oxoglutarate dehydrogenase complex is required for histone succinylation. Disease susceptibility is associated with variants affecting the gene represented in this entry. Belongs to the 2-oxoacid dehydrogenase family.