L-arginine + succinyl-CoA = CoA + H(+) + N(2)-succinyl-L-arginine Amino-acid degradation; L-arginine degradation via AST pathway; L-glutamate and succinate from L-arginine: step 1/5. Heterotetramer of two alpha and two beta subunits. Belongs to the succinylarginine dihydrolase family.