Transmembrane Route
Transmembrane Route - Related Videos
02:20
Routes of Persuasion
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2020
Persuasion is the process of changing our attitude toward something based on some kind of communication. Much of the persuasion we experience comes from outside forces. How do people convince others to change their attitudes, beliefs, and behaviors? What communications do you receive that attempt to persuade you to change your attitudes, beliefs, and behaviors? Yale Attitude Change Approach The topic of persuasion has been one of the most extensively researched areas in social psychology...
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.
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.
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.
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 lipid bilayer favors movement that is compatible with a molecule’s size and charge, while concentration differences influence the direction of passive movement. Small or appropriately compatible substances can cross by passive diffusion, whereas ions and other substances may require membrane proteins. These relationships help explain why cells regulate what enters and leaves rather than relying on unrestricted exchange.
Passive diffusion proceeds without an energy requirement and follows concentration differences. Facilitated diffusion also does not use ATP, but it depends on membrane proteins to provide a route for selected substances. Active transport differs because it requires energy, supplied by ATP or linked to electrochemical gradients. Comparing these mechanisms clarifies how cells move substances under different conditions.
Membrane proteins create selective pathways or transport systems within the membrane. They support facilitated diffusion for substances that do not readily cross the lipid bilayer and provide routes for ions through ion channels. Other proteins participate in active transport. Their selective roles let cells control nutrient uptake, waste removal, and signaling while maintaining homeostasis.
ATP supplies energy for one form of active transport, while electrochemical gradients can also drive energy-dependent movement. These gradients provide directional energy across the membrane, making them important for transport that does not rely on concentration differences alone. This mechanism is especially relevant to ion movement and the regulation of cellular conditions.
A practical first assessment considers the substance’s size, charge, and concentration relationship across the membrane. Researchers then ask whether passive diffusion is plausible or whether a membrane protein is needed, distinguishing facilitated diffusion, ion-channel passage, and active transport. Finally, evidence of ATP use or an electrochemical gradient helps identify energy-dependent movement.
Following movement across epithelial cells can show how substances cross cellular barriers during absorption. The route helps investigators distinguish direct passage through the membrane from movement that depends on transport proteins or energy. This information connects membrane-level behavior with tissue function and can clarify how nutrient uptake is organized in biological systems.
Therapeutic compounds must cross cell membranes to enter or leave cells, so their movement can be examined using the same variables that govern other substances: size, charge, concentration, protein dependence, and energy requirements. Identifying the route helps researchers interpret whether a compound’s cellular access reflects passive diffusion, facilitated transport, ion channels, or active transport.