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Related Concept Videos

Factors Affecting Protein-Drug Binding: Drug Interactions01:23

Factors Affecting Protein-Drug Binding: Drug Interactions

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Drug interactions are a critical aspect of pharmacology and can occur when two or more drugs compete for the same binding site. This competition can result in one drug displacing another, altering the effect of the displaced drug. Drug interactions are complex processes that rely heavily on how much of the displacer drug is present and how strongly it can bind to the same sites as the displaced drug.
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Drug Elimination by Renal Route: Tubular Reabsorption01:22

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During the process of renal excretion, as the glomerular filtrate progresses to the distal convoluted tubule (DCT), drugs that are highly permeable, lipophilic, and nonionized undergo passive reabsorption from the tubular fluid into the surrounding peritubular capillaries. This reabsorption process restricts their elimination through the kidneys. However, the majority of drugs are either weak acids or weak bases, and their ionization level is dependent on pH. By altering the pH of urine, the...
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Drug-receptor bonds are formed through various chemical forces when drugs interact with target cells. Covalent bonds, strong and irreversible, are exemplified by DNA-alkylating anticancer agents that inhibit cell division. However, such irreversible drug binding lacks selectivity and can modify the DNA of the surrounding healthy cells. Covalent binding often contributes to tissue toxicity, as seen with chloroform and paracetamol metabolites binding to the liver, causing hepatotoxicity.
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Targets for Drug Action: Overview01:26

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Drugs target macromolecules to modify ongoing cellular processes. Primary drug targets include receptors, ion channels, transporters, and enzymes.
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Drug Elimination by Renal Route: Tubular Secretion01:15

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Once the process of glomerular filtration is completed, blood carrying unfiltered drug molecules traverses through efferent arterioles and makes its way into the peritubular capillaries in the proximal tubule. A variety of carriers play a pivotal role in actively secreting drugs from these peritubular capillaries into the tubular fluid. The organic anion transporter transfers acidic drugs, against an electrochemical gradient, from the peritubular capillaries into the renal tubule cells and...
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Drug Distribution: Plasma Protein Binding01:29

Drug Distribution: Plasma Protein Binding

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Drugs predominantly attach to plasma proteins, with only a small percentage remaining unbound. The unbound portion can be calculated as one minus the bound fraction. Acidic drugs form large, inactive complexes by reversibly binding to plasma albumin, which prevents them from diffusing across biological barriers. These drug-protein complexes act as reservoirs for the drugs. As the concentration of unbound drugs decreases, these complexes quickly dissociate to release the free drug, maintaining...
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Updated: Sep 11, 2025

A Proteoliposome-Based Efflux Assay to Determine Single-molecule Properties of Cl- Channels and Transporters
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Beyond Gatekeeping: Efflux Pumps Remotely Destabilize Cytoplasmic Drug-Target Interactions by Limiting Rebinding.

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    Bacterial efflux pumps do more than block drug entry; they also disrupt intracellular drug-target binding. This dual action, involving both gatekeeping and kinetic destabilization, significantly enhances multidrug resistance.

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    Area of Science:

    • Microbiology
    • Biophysics
    • Pharmacology

    Background:

    • Bacterial efflux pumps are key to multidrug resistance, traditionally viewed as gatekeepers limiting intracellular drug concentration.
    • Their precise role in intracellular drug-target interactions remains incompletely understood.

    Purpose of the Study:

    • To investigate the post-entry mechanisms of bacterial efflux pumps.
    • To elucidate how efflux pumps influence intracellular drug-target binding dynamics and affinity.

    Main Methods:

    • Quantitative live-cell fluorescence imaging of efflux pump activity in *Escherichia coli* and *Pseudomonas aeruginosa* using Hoechst (HCT).
    • Statistical-physics-based modeling to analyze drug-target interactions within intracellular environments.
    • Experimental validation of model predictions.

    Main Results:

    • Efflux pumps not only reduce intracellular drug entry but also kinetically destabilize drug-target interactions.
    • In efflux-deficient cells, intracellular drugs exhibit enhanced DNA binding stability and higher affinity.
    • Efflux pumps suppress drug rebinding to targets, thereby lowering binding affinity and potentiating resistance.

    Conclusions:

    • Bacterial efflux pumps employ a potent post-entry mechanism by destabilizing intracellular drug-target interactions.
    • This kinetic destabilization, alongside gatekeeping, amplifies multidrug resistance.
    • Findings reveal a novel biophysical mechanism of efflux pumps, expanding the understanding of drug resistance.