Related Experiment Video
Updated: May 12, 2026
05:54
Confocal Microscopy Analysis of Protein Sorting to Plasmodesmata in Nicotiana benthamiana
Published on: November 1, 2024
The KdpD/KdpE two-component system: integrating K⁺ homeostasis and virulence
Zoë N Freeman1, Steve Dorus, Nicholas R Waterfield
1Department of Biology and Biochemistry, University of Bath, Bath, United Kingdom.
Plos Pathogens
|April 5, 2013
Summary
The KdpD/KdpE two-component system (TCS) regulates potassium transport and bacterial virulence. This system is crucial for pathogen survival and adaptation during host infections, influencing multiple virulence factors.
Area of Science:
- Microbiology
- Molecular Biology
- Pathogenesis
Background:
- The KdpD/KdpE two-component system (TCS) is known for regulating potassium transport.
- Emerging evidence links TCSs, including KdpD/KdpE, to bacterial virulence and survival in pathogenic species.
- Pathogenic bacteria face significant stress during host interactions, necessitating adaptive regulatory mechanisms.
Purpose of the Study:
- To investigate the proposed evolved virulence-related regulatory functions of the KdpD/KdpE TCS.
- To review the role of KdpD/KdpE in bacterial infection and its adaptive significance.
Main Methods:
- Literature review of studies on KdpD/KdpE in various pathogenic bacteria.
- Analysis of evidence correlating KdpD/KdpE expression with virulence and survival.
- Examination of KdpE's direct regulation of virulence loci and response to virulence-associated conditions.
Main Results:
- KdpD/KdpE production correlates with enhanced bacterial virulence and intracellular survival.
- KdpE directly binds to promoters of various virulence genes.
- KdpD/KdpE regulation is responsive to host-related factors like phagocytosis, microbicides, quorum sensing, and host hormones.
Conclusions:
- KdpD/KdpE is a critical adaptive TCS involved in bacterial host infection.
- The system promotes virulence and survival through both potassium regulation-dependent and independent mechanisms.
- KdpD/KdpE links stress response pathways to bacterial pathogenesis.
Related Concept Videos
01:28Regulation of Bacterial Virulence
Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
01:14Pharmacokinetic–Pharmacodynamic Relationship: Model Components
Pharmacokinetic-pharmacodynamic (PK–PD) modeling is essential in drug development and clinical pharmacology. It provides a quantitative framework to predict drug behavior and response over time. This approach integrates pharmacokinetics (PK), which describes the drug's absorption, distribution, metabolism, and excretion, with pharmacodynamics (PD), which characterizes the drug’s biological effects and mechanisms of action.The disposition kinetics of a drug determine its plasma...
01:14Pharmacodynamic Models: Link Model and Systems Pharmacodynamic Model
The link model is a fundamental pharmacokinetic-pharmacodynamic (PK–PD) approach to account for delayed drug responses when the observed effect does not immediately correlate with the drug's plasma concentration peak. This delay is mathematically addressed by introducing an effect compartment concentration, Ce, which is kinetically linked to the plasma concentration, Cp, via a first-order rate constant, ke0. The linkage allows for a more accurate prediction of drug effects over time. A higher...
01:16Transduction
Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome are...
01:17Gram-negative Bacterial Protein Secretion Systems
Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
01:26Pharmacokinetic–Pharmacodynamic Relationship: Exposure, Response and Effect
The pharmacokinetic-pharmacodynamic (PK-PD) relationship describes the intricate link between drug exposure, efficacy, and toxicity, forming the foundation for optimal dosing regimens. This relationship uses mathematical modeling to characterize drug concentration-effect dynamics, ensuring precise therapeutic outcomes.Exposure represents the pharmacokinetic aspect of the PK-PD relationship, denoting the drug amount that elicits a biological response. It is typically quantified by administered...