6-diaminopimelate ligase.

UDP-N-acetylmuramyl-tripeptide synthetase
UDP-N-acetylmuramoyl-L-alanyl-D-glutamate--2,6-diaminopimelate ligase
UDP-N-acetylmuramoylalanyl-D-glutamate--2, 6-diaminopimelate ligase (RefSeq)