Key enzyme for ketone body catabolism. Transfers the CoA moiety from succinate to acetoacetate. Formation of the enzyme-CoA intermediate proceeds via an unstable anhydride species formed between the carboxylate groups of the enzyme and substrate (By similarity). . This is the function of Ensembl gene identifier ENSG00000198754 (OXCT2, 3-oxoacid CoA-transferase 2).