Transmembrane Potential
Transmembrane Potential - Related Videos
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.
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.
01:21
The Resting Membrane Potential
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2019
Overview The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane. The Inside of a Neuron Is More Negative The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular...
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.
01:25
Single-pass Transmembrane Proteins
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2023
Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...
FAQs
The sodium-potassium ATPase uses cellular energy to establish ion gradients that contribute to the voltage across the membrane. These gradients create an electrochemical driving force, meaning ions are influenced by both concentration differences and electrical charge. Maintaining this foundation allows later changes in channel activity or membrane permeability to produce meaningful voltage signals for communication and transport.
Selective channels alter transmembrane potential by controlling which ions can cross the membrane. When channel activity changes, membrane permeability changes as well, allowing ion movement to modify the voltage difference. This mechanism links molecular-scale transport to larger cellular responses, particularly in tissues that depend on rapid electrical signaling, such as neuronal and cardiac tissue.
The distribution of ions on each side of the membrane establishes the available electrochemical gradients, while selective permeability determines how strongly those gradients influence voltage. Ion pumps help maintain the unequal distributions, and channels provide routes for movement. Together, ion composition, pump activity, channel selectivity, and changing permeability shape the resulting electrical response.
Bioengineers can investigate transmembrane potential with engineered sensors and electrodes designed to detect voltage changes associated with cellular activity. Measurements can be used to monitor membrane behavior, compare electrical responses, and evaluate how cells or excitable tissues respond to engineered environments. This information supports studies of transport, signaling, and device performance.
Monitoring becomes especially useful when researchers need to assess neuronal or cardiac signaling, membrane transport, or the function of excitable tissues. Voltage measurements provide an indicator of how cells communicate and respond to changes in permeability. In applied work, these observations can help evaluate therapeutic devices and inform the design of neural interfaces.
Biomimetic membranes provide engineered platforms for examining voltage changes and membrane transport in systems designed to reproduce selected biological features. Their behavior can be studied alongside sensors or electrodes to investigate how ion gradients and permeability affect electrical function. Such platforms contribute to neural-interface development and tissue-engineering strategies involving electrically responsive cells or materials.