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Mechanisms of Methicillin Resistance in Staphylococcus aureus

Sharon J Peacock1, Gavin K Paterson

  • 1Department of Medicine, University of Cambridge, Cambridge CB2 0QQ, United Kingdom;

Annual Review of Biochemistry
|June 3, 2015
PubMed

Insights

Methicillin-resistant Staphylococcus aureus (MRSA) infections are a global challenge. This review details the molecular mechanisms of MRSA resistance, focusing on the PBP2a protein and its genetic regulation.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Staphylococcus aureus is a significant pathogen in human and veterinary medicine.
  • Methicillin-resistant S. aureus (MRSA) presents a persistent challenge for infection treatment.
  • MRSA resistance is primarily mediated by the PBP2a protein, which has low affinity for beta-lactam antibiotics.

Purpose of the Study:

  • To review recent advances in understanding the molecular and biochemical mechanisms of methicillin resistance in S. aureus.
  • To elucidate the regulatory pathways and protein structures involved in MRSA resistance.

Main Methods:

  • Review of existing literature on MRSA molecular mechanisms.
  • Analysis of genetic elements (mecA, SCCmec) and protein functions (PBP2a, MecR1, MecI).
  • Examination of signal transduction pathways controlling resistance.

Main Results:

  • The mecA gene encodes PBP2a, crucial for beta-lactam resistance.
  • SCCmec mobile genetic elements carry the mecA gene.
  • A proteolytic signal transduction pathway involving MecR1 and MecI regulates mecA expression.

Conclusions:

  • Understanding the molecular basis of MRSA resistance is key to developing new treatments.
  • Recent advances have significantly improved our knowledge of MRSA's resistance mechanisms.
  • Further research into regulatory events and protein structures is ongoing.
Keywords:
MRSAStaphylococcus aureusantibiotic resistancemethicillin resistancepenicillin-binding proteinβ-lactam antibiotics

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