Light-sensitive Cation Channels
Light-sensitive Cation Channels - Related Videos
08:27
Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy
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Cited by 4 •
2019
This protocol describes techniques used to determine ion channel structures by cryo-electron microscopy, including a baculovirus system used to efficiently express genes in mammalian cells with minimum effort and toxicity, protein extraction, purification, and quality checking, sample grid preparation and screening, as well as data collection and processing.
16:36
Proteomics to Identify Proteins Interacting with P2X2 Ligand-Gated Cation Channels
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Cited by 13 •
2009
We describe a simple protocol to identify brain proteins that bind to the full length C terminus of ATP-gated P2X2 receptors. The extension and systematic application of this approach to all P2X receptors is expected to lead to a better understanding of P2X receptor signaling.
03:54
Optogenetic Electrophysiology Recording of Cells with Light-Dependent Ion Channels
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2025
In this video, embryonic kidney cell cultures expressing light-dependent ion channel proteins fused with a fluorescent reporter demonstrate the effect of light on ion movement. Whole-cell patch clamp is used to monitor the movement of ions.
10:23
Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells
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Cited by 1 •
2016
A protocol for the synthesis and cationization of cobalt-doped magnetoferritin is presented, as well as a method to rapidly magnetize stem cells with cationized magnetoferritin.
04:31
Testing Monosynaptic Connections Using Tetrodotoxin and Tetrodotoxin-Resistant Sodium Channels
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2025
This video demonstrates testing monosynaptic connections using a transgenic fly. The fly has tetrodotoxin-resistant sodium channels and red light-activated channels in its presynaptic neurons, which are optogenetically excited to transmit signals to postsynaptic neurons.
FAQs
Illumination triggers a conformational change in the channelrhodopsin protein. This structural rearrangement opens its ion-conducting pore, allowing positively charged ions to cross the membrane. The resulting change in membrane ion movement provides the immediate electrical mechanism through which a light pulse can influence the state and activity of an engineered neuron.
Because the conducting particles carry positive charge, their movement across the membrane generally shifts the neuronal voltage toward depolarization. That voltage change can increase the likelihood of neuronal firing. The particular effect depends on how ion movement alters the membrane state, but the central consequence is a direct link between channel opening and electrical excitability.
Light pulses determine when the light-sensitive channels change conformation and conduct ions. By choosing the timing of illumination, researchers can associate channel opening with defined moments in neuronal activity. This temporal precision helps test how the timing of selected cellular events relates to neural coding, circuit function, or behavioral responses.
Researchers first introduce the light-sensitive proteins into selected neuronal cells. They then illuminate those cells with timed light pulses to alter ion conductance and influence firing. The resulting activity can be examined in relation to the stimulated cells, connected circuits, or behavior, allowing experiments to connect controlled cellular activation with larger-scale neural outcomes.
The approach is useful when investigators need to relate activity in defined neuronal populations to the operation of a neural circuit. By introducing the proteins into selected cells and stimulating them with precise light pulses, researchers can test how those cells influence circuit activity. This supports experiments that connect particular cellular elements with circuit-level function.
Light-sensitive cation channels let researchers manipulate the activity of selected neurons with controlled timing, creating a way to compare cellular activation with downstream responses. In neuroscience, this can support analysis of neural coding and help link defined neuronal activity to behavior. The same strategy also enables investigation of disease-related network activity.