6'-oxoglucosaminyl:L-glutamate aminotransferase that catalyzes pyridoxal-5'-phosphate-mediated transamination for the conversion of paromamine to neamine in the biosynthetic pathway of neomycin. Also able to catalyze deamination at C-6''' of neomycin. 2-oxoglutarate + neomycin C = 6'''-deamino-6'''-oxoneomycin C + L-glutamate 2-oxoglutarate + neamine = 6'-oxoparomamine + L-glutamate Antibiotic biosynthesis; neomycin biosynthesis. Belongs to the class-III pyridoxal-phosphate-dependent aminotransferase family.