Transmembrane Voltage
Transmembrane Voltage - Related Videos
11:42
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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Cited by 42 •
2015
The reconstitution of the transmembrane protein, KvAP, into giant unilamellar vesicles (GUVs) is demonstrated for two dehydration-rehydration methods — electroformation, and gel-assisted swelling. In both methods, small unilamellar vesicles containing the protein are fused together to form GUVs that can then be studied by fluorescence microscopy and patch-clamp electrophysiology.
06:45
Transmembrane Domain Oligomerization Propensity determined by ToxR Assay
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Cited by 7 •
2011
An efficient procedure to assess the oligomerization propensity of single-pass transmembrane domains (TMDs) is described. Chimeric proteins consisting of the TMD fused to ToxR are expressed in an E. coli reporter strain. TMD-induced oligomerization causes dimerization of ToxR, activation of transcription and production of the reporter protein, -galactosidase.
09:26
Optical Mapping of Intra-Sarcoplasmic Reticulum Ca2+ and Transmembrane Potential in the Langendorff-perfused Rabbit Heart
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Cited by 8 •
2015
This article describes the detailed protocol and equipment necessary for dual optical mapping of transmembrane potential (Vm) and free intra-sarcoplasmic reticulum (SR) Ca2+ in the Langendorff-perfused rabbit heart. This method allows for direct observation and quantification of Vm and SR Ca2+ dynamics in the intact heart.
12:05
Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
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Cited by 7 •
2013
Biophysical and biochemical studies of interactions among membrane-embedded protein domains face many technical challenges, the first of which is obtaining appropriate study material. This article describes a protocol for producing and purifying disulfide-stabilized transmembrane peptide complexes that are suitable for structural analysis by solution nuclear magnetic resonance (NMR) and other analytical applications.
01:13
Voltage
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2024
The movement of electrons in a conductor requires some form of energy or work, usually provided by an external force, like a battery. This force is called the electromotive force or voltage. The voltage between two points, referred to as points "a" and "b," in an electric circuit is the energy (or work) needed to move a unit charge from point "a" to point "b," and this relationship is expressed mathematically as In this equation, "w" represents the energy measured in joules (J), and "q"...
FAQs
The sodium-potassium pump helps establish and preserve the unequal distribution of ions across the membrane. That distribution creates gradients that can drive later ion movement, while the pump supports the underlying electrochemical conditions rather than producing every rapid voltage change. This distinction matters when analyzing how cells maintain electrical readiness for signaling and transport.
Selective permeability determines which ions can cross the membrane. When particular ion channels open, ions move down their electrochemical gradients, shifting the balance of charge across the membrane. The resulting voltage change depends on which pathways become available and on the gradients they expose. Channel opening therefore links molecular membrane events to electrical responses in cells.
Depolarization and hyperpolarization represent opposite changes in membrane voltage, so they can alter a cell’s electrical signaling in different ways. Depolarization moves the voltage in one direction, whereas hyperpolarization moves it in the other. Distinguishing these responses helps researchers interpret how ion-channel activity changes signaling behavior in excitable cells and how abnormalities may affect function.
Ion-channel changes connect membrane chemistry with excitability by converting ion movement into voltage changes that influence electrical signaling. In neurons and cardiac muscle, these changes are especially important because voltage behavior supports action potentials. Studying this connection helps researchers relate altered channel activity to abnormal excitability and to therapeutic strategies involving drugs that modify ion channels.
Researchers can measure or model transmembrane voltage to examine how ion distributions, membrane permeability, and channel activity interact. These approaches provide a way to evaluate electrical behavior in cells and to test how altered ion-channel activity could change signaling. In medicine, the resulting information supports analysis of action potentials, excitability disorders, and drug effects.
In neurons and cardiac muscle, transmembrane voltage provides a framework for understanding action potentials and other changes in electrical signaling. Examining its behavior can help connect ion-channel activity with cellular function in these tissues. This context is medically important because abnormal excitability can contribute to neurological disease or disturbances in cardiac rhythm.
Drugs that alter ion-channel activity can change the ion movements responsible for voltage changes across cell membranes. Measuring or modeling the resulting effects helps researchers evaluate how such treatments influence electrical signaling. This approach is relevant to therapies addressing arrhythmias, pain, and neurological disease, where abnormal excitability or signaling may be involved.