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Related Concept Videos

Ion Channels01:19

Ion Channels

The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow specific...
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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...
Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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...
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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...
Clipper Circuit01:18

Clipper Circuit

A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
Clamper Circuit01:14

Clamper Circuit

A clamper circuit, also known as a DC restorer, represents a specialized variant of the rectifier circuit, notable for its method of taking the output across the diode rather than the capacitor. This configuration lends to several distinctive applications, particularly in handling square wave inputs.
Within this circuit, the diode's orientation prompts the capacitor to charge up to the level of the most negative peak of the input signal. Upon reaching this state, the diode ceases to conduct,...

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Related Experiment Video

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Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment
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Gating the selectivity filter in ClC chloride channels.

Raimund Dutzler1, Ernest B Campbell, Roderick MacKinnon

  • 1Howard Hughes Medical Institute, Laboratory of Molecular Neurobiology and Biophysics, Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.

Science (New York, N.Y.)
|March 22, 2003
PubMed
Summary

Chloride (Cl-) channels regulate cell electrical activity and fluid transport. A study reveals a glutamate group mimics a Cl- ion, closing the channel pore and offering new insights into ClC channel gating mechanisms.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Molecular Physiology

Background:

  • Chloride (Cl-) channels are crucial for cellular functions, including electrical activity, epithelial transport, and vesicle acidification.
  • Understanding the structural basis of ClC channel gating is essential for elucidating their physiological roles.

Purpose of the Study:

  • To investigate the structural mechanisms underlying ClC channel gating.
  • To identify key residues and binding sites involved in pore regulation.

Main Methods:

  • X-ray crystallography was used to determine the structures of wild-type and mutant Escherichia coli ClC channels bound to a Fab fragment.
  • Electrophysiological assays were performed on Torpedo ray ClC channels with mutations in key residues.

Main Results:

  • Three Cl- binding sites were identified within the hourglass-shaped pore of E. coli ClC channels.
  • A specific Cl- binding site near the extracellular solution can be occupied by either a Cl- ion or a glutamate carboxyl group.
  • Mutating this glutamate residue in Torpedo ray ClC channels significantly altered channel gating.

Conclusions:

  • The glutamate carboxyl group can act as a gate by mimicking a Cl- ion, thereby closing the ClC channel pore.
  • This finding reveals a novel gating mechanism for ClC channels involving a specific amino acid residue.
  • The structural insights provide a basis for understanding ClC channel dysfunction and developing targeted therapeutics.