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Volume of Distribution01:20

Volume of Distribution

The apparent volume of distribution (Vd) is a crucial pharmacokinetic parameter representing the hypothetical body fluid volume into which a drug disperses. It is calculated based on the total amount of drug in the body (estimated from the administered dose and bioavailability) divided by the plasma drug concentration. The total amount of drug in the body does not directly refer to the dose given but is derived by accounting for absorption, distribution, metabolism, and excretion processes.
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Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and β2-adrenergic receptors...
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Pharmacodynamics is the scientific study of a drug's biochemical or physiological influence on the body. It categorizes responses into continuous, discrete (or categorical), and time-to-event outcomes. Continuous responses yield numerical values within a certain range, such as blood pressure readings and blood glucose levels, gauging the efficacy of antihypertensive and antidiabetic drugs. Discrete responses can be binary, indicating whether a drug has an effect or not, or ordinal, exemplifying...
Pharmacodynamics: Overview and Principles01:21

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New Features in Visual Dynamics 3.0
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VDAC structure, selectivity, and dynamics.

Marco Colombini1

  • 1Department of Biology, University of Maryland, College Park, MD 20742, USA. columbini@umd.edu

Biochimica Et Biophysica Acta
|January 14, 2012
PubMed
Summary
This summary is machine-generated.

Voltage-gated anion channels (VDACs) control mitochondrial metabolite flux. A novel mechanism explains VDAC voltage gating and selectivity, resolving discrepancies with prior models.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Voltage-gated anion channels (VDACs) are crucial for regulating metabolite transport across the mitochondrial outer membrane in eukaryotes.
  • The canonical VDAC isoform exhibits conserved properties and structure, essential for cellular energy metabolism.
  • Despite extensive study, the precise 3D structure and gating mechanisms of VDAC remain incompletely understood.

Purpose of the Study:

  • To elucidate the fundamental structure and voltage-gating mechanism of VDAC channels.
  • To reconcile conflicting experimental data regarding VDAC function and selectivity.
  • To provide a consistent model for VDAC channel behavior.

Main Methods:

  • Analysis of functional studies on VDAC channel properties.
  • Comparison of proposed structural models with experimental data.
  • Evaluation of different voltage-gating mechanisms.

Main Results:

  • The canonical VDAC structure is proposed to comprise one α helix and 13 β strands, forming a pore with a 2.5nm diameter.
  • A novel voltage-gating mechanism involving the translocation of a charged channel segment is presented.
  • This mechanism explains observed changes in VDAC pore diameter, volume, and ion selectivity under voltage.
  • The proposed mechanism aligns with diverse experimental findings, including gating kinetics and energetics.

Conclusions:

  • The study presents a unified model for VDAC structure and voltage gating that resolves previous inconsistencies.
  • The proposed mechanism accurately predicts VDAC channel behavior, including its exquisite selectivity for ATP.
  • This work contributes to a deeper understanding of mitochondrial function and metabolic regulation.