This domain contains the catalytic domain from Succinyl-CoA ligase alpha subunit and other related enzymes. A conserved histidine is involved in phosphoryl transfer.

1: Two glutamate residues, Glu 208 alpha and Glu 197 beta, are crucial for phosphorylation and dephosphorylation of the active-site histidine residue in succinyl-CoA synthetase. Fraser ME, Joyce MA, Ryan DG, Wolodko WT; Biochemistry. 2002;41:537-546. PMID:11781092