Keywords :
Antibodies, Catalytic/chemistry/genetics; Bacteriophage M13/genetics; Catalytic Domain; Kinetics; Models, Molecular; Mutagenesis; Penicillin-Binding Proteins/antagonists & inhibitors; Peptide Library; Peptides, Cyclic/chemistry/genetics/pharmacology; Peptidomimetics/chemistry/pharmacology; Protein Engineering; Tryptophan/chemistry; beta-Lactamase Inhibitors
Abstract :
[en] 9G4H9, a catalytic antibody displaying beta-lactamase-like activity, has been developed by the anti-idiotypic approach using beta-lactamase as the first antigen. Thus 9G4H9 represents the 'internal image' of beta-lactamase. We selected a cyclic peptide anchored to a bacteriophage M13 library using 9G4H9 as the target. Pep90 is a cyclic heptapeptide enclosed between two cysteine residues. We showed that Pep90 could inhibit both TEM-1 beta-lactamase (K(i) = 333 mum) and several penicillin-binding proteins (IC(5)(0) values ranging from 6-62 mum). We determined that the tryptophan residue of Pep90 is of crucial importance for its inhibitory activity. Using Pep90 as a scaffold, we generated a new class of peptidomimetics that retained inhibitory activity towards TEM-1 beta-lactamase.
Scopus citations®
without self-citations
9