FemX uses aminoacyl-tRNA as an amino acid donor to synthesise the peptide cross-bridge in peptidoglycan, apart of the cell wall of gram-positive bacteria. FemX belongs to the Fem family of nonribosomal peptidyl transferases . FemX is required for cell survival and is a target for beta-lactam antibiotics.
Defined by 6 residues: LYS:A-36ASP:A-108ARG:A-211PHE:A-304LYS:A-305GLU:A-319