Catalyzes the conversion of 5-aminovalerate to 5-oxopentanoate. 2-oxoglutarate + 5-aminopentanoate = 5-oxopentanoate + L-glutamate Induced in response to corn root exudates, by lysine and by 5-aminovalerate. Mutants are impaired in lysine utilization and show a slight reduction in the root colonization capacity. Belongs to the class-III pyridoxal-phosphate-dependent aminotransferase family.