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Related Concept Videos

Non-gated Ion Channels01:24

Non-gated Ion Channels

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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
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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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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Hydrophobic gating in BK channels.

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Big potassium (BK) channels do not require a physical gate to close. Instead, pore shape and hydrophobicity changes cause hydrophobic dewetting, blocking ion flow and regulating channel activity.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Membrane Protein Function

Background:

  • Transmembrane ion channels control ion flow, vital for physiological processes.
  • Big potassium (BK) channels exhibit large conductance and dual regulation by voltage and calcium.
  • Previous BK channel structures lacked identifiable physical gates in the closed state.

Purpose of the Study:

  • To investigate the gating mechanism of Big potassium (BK) channels.
  • To determine if a physical gate is required for BK channel closure.
  • To elucidate the role of pore properties in BK channel regulation.

Main Methods:

  • Analysis of atomistic structures of BK channels.
  • Computational modeling of pore shape and hydrophobicity.
  • Interpretation of scanning mutagenesis data.

Main Results:

  • BK channel gating does not necessitate a physical blocking gate.
  • Ca2+-free conditions induce pore shape and hydrophobicity changes.
  • These alterations promote hydrophobic dewetting, creating a permeation barrier for K+.
  • The 'dry' pore remains open and accessible to blockers.

Conclusions:

  • BK channel gating operates via a hydrophobic mechanism, not a physical gate.
  • Pore hydrophobicity and shape changes are key to channel regulation.
  • This mechanism explains observed correlations between pore hydrophobicity and channel activation.