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Related Concept Videos

The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
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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...

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Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes
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Ca2+-activated K+ channels: from protein complexes to function.

Henrike Berkefeld1, Bernd Fakler, Uwe Schulte

  • 1Institute of Physiology II, University of Freiburg, and Centre for Biological Signalling Studies (Bioss),Freiburg, Germany. bernd.fakler@physiologie.uni-freiburg.de

Physiological Reviews
|October 21, 2010
PubMed
Summary
This summary is machine-generated.

Protein complexes are crucial for calcium-activated potassium (K(Ca)) channel function. Understanding these interactions reveals how K(Ca) channels regulate cellular processes and signaling pathways.

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Area of Science:

  • Molecular biology
  • Cellular signaling
  • Protein biochemistry

Background:

  • Ion channels, including calcium-activated potassium (K(Ca)) channels, are integral membrane proteins that mediate cellular signaling.
  • These channels often associate with partner proteins or form macromolecular complexes to ensure signal specificity and appropriate transduction rates.
  • K(Ca) channels play vital roles in cellular processes such as smooth muscle tone regulation, neurotransmission, and neuronal firing patterns.

Purpose of the Study:

  • To review recent proteomic insights into protein complexes associated with K(Ca) channels.
  • To discuss the structure, function, and protein-protein interactions within these complexes.
  • To elucidate the significance of these complexes for K(Ca) channel function in cellular environments.

Main Methods:

  • Proteomic research to identify K(Ca) channel-associated proteins.
  • Analysis of existing literature on the structure and function of these protein complexes.
  • Investigation of protein-protein interaction mechanisms.

Main Results:

  • Proteomic studies have identified diverse protein partners interacting with K(Ca) channels.
  • These interactions are critical for the specific localization, modulation, and overall function of K(Ca) channels.
  • The identified complexes highlight the intricate regulatory networks governing K(Ca) channel activity.

Conclusions:

  • Protein complexes are essential for the proper functioning of calcium-activated potassium channels.
  • Understanding these molecular interactions provides key insights into cellular excitability and signaling.
  • Further research into K(Ca) channel complexes will advance our knowledge of various physiological and pathological processes.