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Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within...
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Aminoglycosides are a class of antibiotics used to treat various bacterial infections. Clinicians must determine the elimination rate constant (k) and volume of distribution (VD) to optimize therapeutic efficacy and minimize toxicity. The k value represents the rate at which the drug is removed from the body, and the VD reflects the degree to which the drug distributes into body tissues. Accurately estimating these parameters allows healthcare professionals to tailor drug dosing to individual...
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Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and...
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Potassium Uptake Modulates Staphylococcus aureus Metabolism.

Casey M Gries1, Marat R Sadykov1, Logan L Bulock1

  • 1Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska, USA.

Msphere
|June 25, 2016
PubMed
Summary
This summary is machine-generated.

Potassium (K+) uptake via the Ktr system is crucial for Staphylococcus aureus homeostasis. It maintains cytoplasmic pH and energy production, impacting bacterial survival and infection.

Keywords:
Staphylococcus aureusmetabolismpotassium transport

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Area of Science:

  • Microbiology
  • Cellular Physiology
  • Biochemistry

Background:

  • Staphylococcus aureus causes significant community and nosocomial infections.
  • Cellular homeostasis and adaptation to environmental changes are vital for S. aureus survival.
  • Membrane activity, particularly potassium (K+) transport, is essential for maintaining electrochemical gradients, ATP synthesis, and overall cellular function.

Purpose of the Study:

  • To investigate the role of Ktr-mediated K+ uptake in Staphylococcus aureus.
  • To determine the impact of K+ uptake on cytoplasmic pH and proton motive force.
  • To elucidate how K+ deficiency affects S. aureus metabolic and energy states.

Main Methods:

  • Utilized a pH-dependent green fluorescent protein (GFP) to measure intracellular pH in S. aureus.
  • Performed metabolite analyses to assess the effects of K+ deficiency on cellular metabolism.
  • Investigated the Ktr-mediated K+ transport system's function under varying conditions.

Main Results:

  • Ktr-mediated K+ uptake is essential for maintaining cytoplasmic pH and establishing a proton motive force in S. aureus.
  • K+ deficiency impairs oxidative phosphorylation and redirects carbon flux towards substrate-level phosphorylation.
  • K+ uptake supports proton efflux, particularly under alkaline conditions, and is critical for efficient carbon utilization.

Conclusions:

  • Potassium uptake is fundamental for maintaining S. aureus metabolism and energy homeostasis.
  • The Ktr system plays a critical role in regulating intracellular pH and supporting efficient metabolic pathways.
  • Understanding K+ transport mechanisms provides insights into S. aureus virulence and potential therapeutic targets.