β-Lactam resistance in Staphylococcus aureus: the adaptive resistance of a plastic genome

  • C. C. S. Fuda
  • J. F. Fisher
  • S. Mobashery


Staphylococci have two mechanisms for resistance to β-lactam antibiotics. One is the production of β-lactamases, enzymes that hydrolytically destroy β-lactams. The other is the expression of penicillin-binding protein 2a (PBP 2a), which is not susceptible to inhibition by β-lactam antibiotics. Strains of S. aureus exhibiting either β-lactamase or PBP 2a-directed resistance (or both) have established a considerable ecological niche among human pathogens. The emergence and subsequent spread of bacterial strains designated as methicillin-resistant S. aureus (MRSA), from the 1960s to the present, has created clinical difficulties for nosocomial treatment on a global scale. The recent variants of MRSA that are resistant to glycopeptide antibiotics (such as vancomycin) have ushered in a new and disconcerting chapter in the evolution of this organism.

Key words.

Staphylococcus aureus beta-lactamase blaZ blaI blaR mecR mecI mecA PBP 2a MRSA VRSA 

Copyright information

© Birkhäuser Verlag, Basel 2005

Authors and Affiliations

  1. 1.Department of Chemistry and BiochemistryUniversity of Notre DameNotre DameUSA

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