Transaminates both N(2)-acetylornithine and N(2)-succinylornithine. 2-oxoglutarate + N(2)-succinyl-L-ornithine = L-glutamate + N-succinyl-L-glutamate 5-semialdehyde 2-oxoglutarate + N(2)-acetyl-L-ornithine = L-glutamate + N-acetyl-L-glutamate 5-semialdehyde Binds 1 pyridoxal phosphate per subunit. Amino-acid biosynthesis; L-arginine biosynthesis; N(2)-acetyl-L-ornithine from L-glutamate: step 4/4. Amino-acid degradation; L-arginine degradation via AST pathway; L-glutamate and succinate from L-arginine: step 3/5. Homodimer. Induced by arginine and repressed by succinate. Belongs to the class-III pyridoxal-phosphate-dependent aminotransferase family. ArgD subfamily.