βLactam Resistance Mediated by Changes in Penicillin-Binding Proteins
The widespread use, or perhaps overuse, of penicillin during the past 50 yr has driven the evolution of resistance to penicilling in numerous different species of bacteria.Typically, resistance has arisen as a result of the acquisition of β-lactamases that inactivate the antibiotic (see Chapter 25 . Alternatively, in some Gram-negative bacteria, resistance may have arisen by a reduction in the ability of the antibiotic to access its target. However, in a number of clinically important Gram-negative and Gram-positive bacteria, resistance has arisen by alteration of the targets for penicillin and other β-lactam antibiotics, namely, the penicillin-binding proteins (PBPs).
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