New Noncovalent Inhibitors of Penicillin-Binding Proteins from Penicillin-Resistant Bacteria

New Noncovalent Inhibitors of Penicillin-Binding Proteins from Penicillin-Resistant Bacteria

BACKGROUND Penicillin-binding proteins (PBPs) are well known and validated targets for antibacterial therapy. The most important clinically used inhibitors of PBPs β-lactams inhibit transpeptidase activity of PBPs by forming a covalent penicilloyl-enzyme complex that blocks the normal transpeptidation reaction; this finally results in bacterial death. In some resistant bacteria the resistance i...

Penicillin-resistant viridans streptococci have obtained altered penicillin-binding protein genes from penicillin-resistant strains of Streptococcus pneumoniae.

Penicillin-resistant strains of Streptococcus pneumoniae possess altered forms of penicillin-binding proteins (PBPs) with decreased affinity for penicillin. The PBP2B genes of these strains have a mosaic structure, consisting of regions that are very similar to those in penicillin-sensitive strains, alternating with regions that are highly diverged. Penicillin-resistant strains of viridans grou...

Mechanisms of acquired penicillin-resistance in Streptomyces cacaoi. Role of penicillin-binding proteins in penicillin resistant mutants.

Several mutants isolated after N-methyl-N'-nitro-N-nitrosoguanidine mutagenesis of Streptomyces cacaoi strain KCCS-0352, were resistant to benzylpenicillin ranging in concentration from 1,000 to 5,000 micrograms/ml (4- to 20-fold more resistant than the parent). These mutants also acquired resistance to mecillinam, cephamycin C and methicillin. The affinity for beta-lactams of penicillin-bindin...

Properties of a Penicillin Inactivator Extracted from Penicillin-resistant Staphylococci.

Interaction of penicillin with the bacterial cell: penicillin-binding proteins and penicillin-sensitive enzymes.

INTRODUCTION ........................................................ 291 General ............... ......................................... 291 Cell Waill Structure and Synthesis ....................... ........................ 292 Identification of the Target of Penicillin Action .......... ........................ 293 PENICILLIN-BINDING COMPONENTS .............. .......................... 296...