Essential for murein biosynthesis (PubMed:29280348). Probably catalyzes the conversion of L-2-acetamido-6-oxopimelate to N-acetyl-LL-2,6-diaminopimelate (Probable). 2-oxoglutarate + N-acetyl-(2S,6S)-2,6-diaminoheptanedioate = L-2-acetamido-6-oxoheptanedioate + L-glutamate Amino-acid biosynthesis; L-lysine biosynthesis via DAP pathway; LL-2,6-diaminopimelate from (S)-tetrahydrodipicolinate (acetylase route): step 2/3. Homodimer. Belongs to the class-I pyridoxal-phosphate-dependent aminotransferase family.