Outer Leaflet Lipids
Outer Leaflet Lipids - Related Videos
11:12
Protocol for Relative Hydrodynamic Assessment of Tri-leaflet Polymer Valves
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Cited by 5 •
2013
There has been renewed interest in developing polymer valves. Here, the objectives are to demonstrate the feasibility of modifying a commercial pulse duplicator to accommodate tri-leaflet geometries and to define a protocol to present polymer valve hydrodynamic data in comparison to native and prosthetic valve data collected under near-identical conditions.
09:55
From Constructs to Crystals – Towards Structure Determination of β-barrel Outer Membrane Proteins
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Cited by 8 •
2016
β-barrel outer membrane proteins (OMPs) serve many functions within the outer membranes of Gram-negative bacteria, mitochondria, and chloroplasts. Here, we hope to alleviate a known bottleneck in structural studies by presenting protocols for the production of β-barrel OMPs in sufficient quantities for structure determination by X-ray crystallography or NMR spectroscopy.
03:38
Structure of Lipids
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2020
Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic birds and...
11:06
Method for the Isolation of Francisella tularensis Outer Membranes
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Cited by 11 •
2010
A protocol for separating inner and outer membranes from Francisella tularensis by spheroplasting, osmotic lysis, and sucrose density gradient ultracentrifugation.
03:47
Separation of Inner and Outer Membrane Fractions of Gram-Negative Bacteria
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2025
Source: Cian, M. B. et. al., Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii. J. Vis. Exp. (2020)This video demonstrates the separation of the inner and outer membrane fractions of Gram-negative bacteria using sucrose gradient ultracentrifugation. The membrane fractions are purified and stored at low temperatures for targeted analysis of membrane-specific components.
FAQs
These lipid-translocating enzymes regulate how molecules are distributed between the two membrane leaflets. Flippases and floppases contribute to selective redistribution, whereas scramblases provide another regulated route for moving lipids across the bilayer. Their activity helps establish or alter asymmetry during membrane biogenesis and under specific cellular conditions, making enzyme regulation central to membrane organization.
Asymmetry gives the plasma membrane different chemical compositions on its extracellular and intracellular sides. The outer leaflet therefore helps determine surface chemistry and how the cell interacts with its environment. Changes in its composition can influence cell recognition, signaling, trafficking, and interactions with external molecules such as drugs, toxins, and pathogens.
These lipid classes form important components of the extracellular-facing membrane layer. Together, they contribute to membrane structure and surface chemistry rather than serving as interchangeable molecules with identical effects. Examining their composition helps biochemists relate the molecular makeup of the surface to cell recognition, environmental interactions, and broader membrane organization.
A useful analysis considers both which lipid classes are present and how their distribution relates to the opposite leaflet. Researchers can also examine the enzymes that move lipids between leaflets and the conditions that regulate those movements. Connecting composition, asymmetry, and enzyme activity helps explain how the membrane maintains or changes its functional surface.
Because these molecules form part of the cell’s extracellular surface, their composition can affect how the cell is identified and how it interacts with its surroundings. Biochemical studies connect lipid distribution with signaling and trafficking, allowing researchers to investigate how membrane organization supports communication and movement of materials across cellular systems.
The outer membrane surface is a point of contact between the cell and external biological or chemical agents. Its lipid composition and organization can therefore provide context for studying apoptosis, as well as interactions with drugs, toxins, and pathogens. Comparing surface lipid patterns with these outcomes helps relate membrane biochemistry to cellular responses and environmental exposure.