Involved in the biosynthesis of kanosamine (3-amino-3-deoxy-D-glucose), which is known to have antibiotic and antifungal properties, and to be a precursor of the antibiotic neotrehalosadiamine (3,3'-diamino-3,3'-dideoxy-alpha,beta-trehalose (NTD)). Catalyzes the reversible pyridoxal phosphate-dependent transamination of 3-dehydro-alpha-D-glucose 6-phosphate to form alpha-D-kanosamine-6-phosphate. It can only use alpha-anomer and glutamate is the only amino donor. 3-dehydro-D-glucose 6-phosphate + L-glutamate = 2-oxoglutarate + D-kanosamine 6-phosphate Antibiotic biosynthesis; kanosamine biosynthesis. Homodimer. Induced by neotrehalosadiamine. The production of neotrehalosadiamine is dormant in the wild-type strain. A mutation in the beta subunit of RNA polymerase activates the production of the neotrehalosadiamine (PubMed:14612444). Belongs to the DegT/DnrJ/EryC1 family.