Image:3OC2 Wiki. Ribbon representation of the atomic structure of<unk>  Binding<unk> 3 from Pseudomonas aeruginosa (PDB 3OC2), image created with PyMol.<unk>  normally catalyze the cross-linking of the bacterial cell wall, but they can be permanently inhibited by<unk>  and other β-lactam antibiotics. (NAM = N-acetylmuramic acid; NAG = N-acetylglucosamine)<unk>  <unk>  are a group of<unk>  that are characterized by their affinity for and binding of<unk> . They are a normal constituent of many bacteria; the name just reflects the way by which the<unk> was discovered. All β-lactam antibiotics (except for tabtoxinine-β-lactam, which inhibits glutamine synthetase) bind to<unk> , which are essential for bacterial cell wall synthesis.<unk>  are members of a subgroup of enzymes called transpeptidases. Specifically,<unk>  are DD-transpeptidases.
Penicillin-binding proteins
Transfer factor
Fibrinolysin
Antimicrobial peptides
New Delhi metallo-beta-lactamase 1
M protein 
Virulence factor
Lipopolysaccharide binding protein