Involved in both the arginine and lysine biosynthetic pathways. 2-oxoglutarate + [amino-group carrier protein]-C-terminal-gamma-(L-lysyl)-L-glutamate = [amino-group carrier protein]-C-terminal-N-(1-carboxy-5-oxopentan-1-yl)-L-glutamine + L-glutamate 2-oxoglutarate + [amino-group carrier protein]-C-terminal-gamma-(L-ornithyl)-L-glutamate = [amino-group carrier protein]-C-terminal-gamma-(L-glutamyl-5-semialdehyde)-L-glutamate + L-glutamate Binds 1 pyridoxal phosphate per subunit. Amino-acid biosynthesis; L-lysine biosynthesis via AAA pathway; L-lysine from L-alpha-aminoadipate (Thermus route): step 4/5. Amino-acid biosynthesis; L-arginine biosynthesis. Homodimer. May also have succinyldiaminopimelate aminotransferase activity, thus carrying out the corresponding step in lysine biosynthesis. Belongs to the class-III pyridoxal-phosphate-dependent aminotransferase family. LysJ subfamily.