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Methicillin resistance in Staphylococcus aureus: mechanisms and modulation
Paul D Stapleton1, Peter W Taylor
1School of Pharmacy, 29-39 Brunswick Square, London WC1N 1AX. paul.stapleton@ulsop.ac.uk
Abstract:
Staphylococcus aureus is a major pathogen both within hospitals and in the community. Methicillin, a beta-lactam antibiotic, acts by inhibiting penicillin-binding proteins (PBPs) that are involved in the synthesis of peptidoglycan, an essential mesh-like polymer that surrounds the cell. S. aureus can become resistant to methicillin and other beta-lactam antibiotics through the expression of a foreign PBP, PBP2a, that is resistant to the action of methicillin but which can perform the functions of the host PBPs. Methicillin-resistant S. aureus isolates are often resistant to other classes of antibiotics (through different mechanisms) making treatment options limited, and this has led to the search for new compounds active against these strains. An understanding of the mechanism of methicillin resistance has led to the discovery of accessory factors that influence the level and nature of methicillin resistance. Accessory factors, such as Fem factors, provide possible new targets, while compounds that modulate methicillin resistance such as epicatechin gallate, derived from green tea, and corilagin, provide possible lead compounds for development of inhibitors.
Insights
Methicillin-resistant Staphylococcus aureus (MRSA) develops resistance via PBP2a. New compounds like epicatechin gallate and corilagin show promise for combating MRSA infections.
Area of Science:
- Microbiology
- Medicinal Chemistry
Background:
- Staphylococcus aureus is a significant pathogen in healthcare and community settings.
- Methicillin resistance in S. aureus is primarily mediated by the acquisition of PBP2a, a methicillin-resistant penicillin-binding protein.
- MRSA strains often exhibit multi-drug resistance, limiting therapeutic options.
Purpose of the Study:
- To explore the mechanisms of methicillin resistance in Staphylococcus aureus.
- To identify novel therapeutic targets and lead compounds for combating MRSA.
Main Methods:
- Investigated the role of penicillin-binding proteins (PBPs) in peptidoglycan synthesis.
- Examined the function of PBP2a in conferring methicillin resistance.
- Identified accessory factors, such as Fem factors, influencing resistance levels.
- Evaluated natural compounds like epicatechin gallate and corilagin for their potential to modulate resistance.
Main Results:
- PBP2a confers resistance to methicillin by performing essential cell wall synthesis functions.
- Accessory factors, including Fem factors, modulate the degree of methicillin resistance.
- Epicatechin gallate and corilagin demonstrate potential as modulators of methicillin resistance.
Conclusions:
- Understanding PBP2a and accessory factors is crucial for developing new anti-MRSA strategies.
- Natural compounds like epicatechin gallate and corilagin represent promising starting points for novel MRSA inhibitor development.