During normal bacterial growth, bacterial enzymes called autolysins put breaks in the peptidoglycan in order to allow for insertion of peptidoglycan building blocks (monomers of NAG-NAM-peptide). These monomers are then attached to the growing end of the bacterial cell wall with transglycosidase enzymes. Finally, transpeptidase enzymes join the peptide of one monomer with that of another in order to provide strength to the cell wall. Vancomycins bind to the peptides of the peptidoglycan monomers and block both the formation of gycosidic bonds between the sugars by the transgycosidase enzymes and the formation of the peptide cross-links by the transpeptidase enzymes. This results in a weak cell wall and osmotic lysis of the bacterium.