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Related Concept Videos

Non-gated Ion Channels01:24

Non-gated Ion Channels

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.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
Non-gated Ion Channels01:24

Non-gated Ion Channels

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.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
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.
Resting Potential Decay01:15

Resting Potential Decay

The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane through...
Resting Potential Decay01:15

Resting Potential Decay

The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane through...
Primary Active Transport01:29

Primary Active Transport

In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would not...

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Related Experiment Video

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Reconstitution of a Transmembrane Protein, the Voltage-gated Ion Channel, KvAP, into Giant Unilamellar Vesicles for Microscopy and Patch Clamp Studies
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Reconstitution of a Transmembrane Protein, the Voltage-gated Ion Channel, KvAP, into Giant Unilamellar Vesicles for Microscopy and Patch Clamp Studies

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Long-pore electrostatics in inward-rectifier potassium channels.

Janice L Robertson1, Lawrence G Palmer, Benoît Roux

  • 1Program in Physiology, Biophysics and Systems Biology, Weill Graduate School of Medical Sciences, Cornell University, New York, NY 10065, USA.

The Journal of General Physiology
|November 13, 2008
PubMed
Summary

Inward-rectifier potassium (Kir) channels use a unique long pore for ion conduction. Electrostatic analysis reveals this pore favors cations, with protein charges compensating for unfavorable internal fields to regulate channel function.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Structural Biology

Background:

  • Inward-rectifier potassium (Kir) channels possess a unique, extended cytoplasmic pore.
  • This structure is critical for regulating channel conductance, ion block, and gating.

Purpose of the Study:

  • To investigate the electrostatic environment within the extended pore of mammalian Kir channels.
  • To understand how electrostatics influence ion permeation, block, and gating.

Main Methods:

  • Homology modeling of four mammalian Kir channels (Kir1.1, Kir2.1, Kir3.1, Kir6.2) based on KirBac1.1.
  • Solving the Poisson-Boltzmann equation to determine electrostatic free energy for K+ ions.
  • Decomposition of electrostatic fields to identify key residues.

Main Results:

  • Mammalian Kir channels create a favorable electrostatic environment for cations within their pores.
  • Unfavorable reaction field energies within the pore are compensated by protein charges.
  • Specific residues interacting with ions over long distances correlate with mutagenesis data for conduction and rectification.

Conclusions:

  • The extended pore's electrostatics are crucial for Kir channel function, influencing ion permeation and block.
  • Protein charges play a vital role in stabilizing ions within the pore.
  • This work provides a framework for understanding ion interactions in complex channel structures.