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Related Concept Videos

G-Protein Gated Ion Channels01:21

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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Membrane potentials regulating GPCRs: insights from experiments and molecular dynamics simulations.

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Membrane voltage influences G-protein coupled receptors (GPCRs) signaling and drug binding. Understanding GPCR voltage sensitivity offers new avenues for drug design in various cell types.

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Cell Biology

Background:

  • G-protein coupled receptors (GPCRs) are crucial membrane proteins and major drug targets.
  • Cell membrane potential significantly impacts cellular functions.
  • Emerging evidence shows membrane voltage modulates GPCR activity.

Purpose of the Study:

  • To review experimental findings on GPCR voltage regulation.
  • To explore the structural basis of GPCR voltage sensing using molecular dynamics simulations.
  • To discuss the implications of GPCR voltage sensitivity for drug discovery.

Main Methods:

  • Literature review of experimental studies on GPCR voltage sensitivity.
  • Analysis of molecular dynamics simulations elucidating GPCR voltage-sensing mechanisms.
  • Discussion of pharmacological relevance in different cell contexts.

Main Results:

  • Membrane voltage directly affects GPCR signal transduction and ligand binding.
  • GPCR voltage sensitivity varies with cell type and excitation status.
  • Molecular dynamics simulations provide structural insights into voltage sensing.

Conclusions:

  • GPCR voltage sensitivity has significant pharmacological implications.
  • Targeting voltage-sensitive GPCRs may lead to novel therapeutic strategies.
  • This understanding is crucial for drug design in both excitable and non-excitable cells.