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Anionic properties of beta-lactam-enhancing factor on methicillin-resistant Staphylococcus aureus
Y Tajima1, Z Nagasawa, I Tanabe
1Clinical Laboratory, Saga Medical School Hospital, Japan.
Abstract:
We found a Factor (factor T) in aged mixtures of tungstate and phosphate which greatly enhanced the antibacterial effects of beta-lactams upon methicillin-resistant Staphylococcus aureus (MRSA). Factor T suppressed penicillinase production and the amount of penicillin-binding protein-2' in the membrane fraction, thus sensitizing MRSA strains to beta-lactams. In addition, Factor T caused a metachromatic reaction and prolonged the blood coagulation time, indicating that it is a heparin-like polyanion. Since Factor T becomes ineffective in the presence of a polycation, a charge interaction may play an important role in the enhancing effect. One possibility is that Factor T non-specifically inhibits several anion-sensitive enzymes. Factor T inhibited several nucleotide-interacting enzymes, but not most serum enzymes.
Insights
A novel Factor T, derived from tungstate and phosphate, enhances beta-lactam antibiotics against methicillin-resistant Staphylococcus aureus (MRSA). It works by inhibiting penicillinase and sensitizing MRSA, offering a new strategy for combating resistant bacteria.
Area of Science:
- Biochemistry
- Microbiology
- Pharmacology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant threat due to its resistance to beta-lactam antibiotics.
- Existing treatments often struggle with MRSA efficacy, necessitating novel therapeutic approaches.
Purpose of the Study:
- To identify and characterize a factor that enhances the antibacterial activity of beta-lactams against MRSA.
- To elucidate the mechanism by which this factor exerts its effect.
Main Methods:
- Extraction and purification of Factor T from aged tungstate and phosphate mixtures.
- Assessment of Factor T's effect on beta-lactam efficacy against MRSA strains.
- Analysis of penicillinase production and penicillin-binding protein-2' levels.
- Characterization of Factor T's biochemical properties, including its interaction with polycations and its enzymatic inhibition profile.
Main Results:
- Factor T significantly enhanced beta-lactam antibacterial effects against MRSA.
- Factor T suppressed penicillinase production and reduced penicillin-binding protein-2' in MRSA.
- Factor T exhibited properties of a heparin-like polyanion, indicated by a metachromatic reaction and prolonged blood coagulation time.
- The enhancing effect of Factor T was diminished by polycations, suggesting a role for charge interactions.
- Factor T inhibited several nucleotide-interacting enzymes but not most serum enzymes.
Conclusions:
- Factor T is a potent enhancer of beta-lactam antibiotics against MRSA.
- Its mechanism involves the inhibition of key bacterial enzymes and sensitization of MRSA to beta-lactams.
- Factor T's polyanionic nature and potential non-specific inhibition of anion-sensitive enzymes are crucial for its activity.