Catalyzes the transfer of the terminal amino group of L-lysine or L-ornithine to alpha-ketoglutarate. Oxaloacetate and pyruvate can also be used as acceptors of the amino group but with very low efficiency. 2-oxoglutarate + L-lysine = (S)-2-amino-6-oxohexanoate + L-glutamate Optimum pH is 7.0-7.5. Optimum temperature is 30 degrees Celsius. Antibiotic biosynthesis; cephamycin C biosynthesis. Active as either a monomer or a homomer. Present only in beta-lactam producing actinomycetes. Belongs to the class-III pyridoxal-phosphate-dependent aminotransferase family.