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. Homodimer. May also have succinyldiaminopimelate aminotransferase activity, thus carrying out the corresponding step in lysine biosynthesis. Belongs to the class-III pyridoxal-phosphate-dependent aminotransferase family. ArgD subfamily.