2.6.1.17	physiological function	in Escherichia coli, the major enzymes with N-succinyl-L,L-diaminopimelate aminotransferase (SDAP-AT) activity in lysine synthesis are ArgD, AstC, and SerC. Lysine availability does not regulate synthesis of the major SDAP-ATs. Complementation analysis of mutants lacking aminotransferases shows that the SDAP-ATs and alanine aminotransferases are exceptionally redundant, and this redundancy may ensure peptidoglycan synthesis	739103