In enzymology, a dihydrolipoyllysine-residue succinyltransferase (EC 2.3.1.61) is an enzyme that catalyzes the chemical reaction

succinyl-CoA + enzyme N₆-(dihydrolipoyl)lysine ${\displaystyle \rightleftharpoons }$ CoA + enzyme N₆-(S-succinyldihydrolipoyl)lysine

Thus, the two substrates of this enzyme are succinyl-CoA and enzyme N6-(dihydrolipoyl)lysine, whereas its two products are CoA and enzyme N6-(S-succinyldihydrolipoyl)lysine.

This enzyme belongs to the family of transferases, specifically those acyltransferases transferring groups other than aminoacyl groups. The systematic name of this enzyme class is succinyl-CoA:enzyme-N6-(dihydrolipoyl)lysine S-succinyltransferase. Other names in common use include dihydrolipoamide S-succinyltransferase, dihydrolipoamide succinyltransferase, dihydrolipoic transsuccinylase, dihydrolipolyl transsuccinylase, dihydrolipoyl transsuccinylase, lipoate succinyltransferase (Escherichia coli), lipoic transsuccinylase, lipoyl transsuccinylase, succinyl-CoA:dihydrolipoamide S-succinyltransferase, succinyl-CoA:dihydrolipoate S-succinyltransferase, and enzyme-dihydrolipoyllysine:succinyl-CoA S-succinyltransferase. This enzyme participates in citrate cycle (tca cycle) and lysine degradation.

As of late 2007, 11 structures have been solved for this class of enzymes, with PDB accession codes 1BAL, 1BBL, 1C4T, 1E2O, 1GHJ, 1GHK, 1PMR, 1SCZ, 2BTG, 2BTH, and 2CYU.