2.6.1.11 4-aminobutyrate + 2-oxoglutarate reaction of EC 2.6.1.19 2.6.1.11 N-acetyl-L-glutamic gamma-semialdehyde + L-glutamate fourth step in biosynthesis of arginine, arginine-repressible biosynthetic enzyme 2.6.1.11 N2-acetyl-L-ornithine + 2-oxoglutarate arginine degradation, arginine-inducible catabolic enzyme 2.6.1.11 N2-acetyl-L-ornithine + 2-oxoglutarate -