Lipid Ii Formation
Lipid Ii Formation - Related Videos
08:23
Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film
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Cited by 4 •
2016
We demonstrate a storable, transportable lipid bilayer formation system. A lipid bilayer membrane can be formed within 1 hr with over 80% success rate when a frozen membrane precursor is brought to ambient temperature. This system will reduce laborious processes and expertise associated with ion channels.
07:53
Super-Resolution Imaging of NK Cell Immunological Synapse Formation on a Supported Lipid Bilayer
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2025
This video demonstrates a technique for visualizing the formation of the immunological synapse in natural killer (NK) cells on a supported lipid bilayer (SLB). The SLB is first labeled with a fluorophore-tagged NK cell activating receptor ligand, followed by incubation with NK cells. Subsequently, the cells are stained for polymerized actin and perforin-positive lytic granules. This approach enables the visualization of synapse formation using stimulated emission depletion (STED) microscopy.
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...
10:58
Methods to Study Lipid Alterations in Neutrophils and the Subsequent Formation of Neutrophil Extracellular Traps
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Cited by 5 •
2017
Lipids are known to play an important role in cellular functions. Here, we describe a method to determine the lipid composition of neutrophils, with emphasis on the cholesterol level, by using both HPTLC and HPLC to gain a better understanding of the underlying mechanisms of neutrophil extracellular trap formation.
11:53
Crystallization of Membrane Proteins in Lipidic Mesophases
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Cited by 30 •
2011
The protocols describe the essential steps for obtaining diffraction quality crystals of a membrane protein starting from reconstitution of the protein in a lipidic cubic phase (LCP), finding initial conditions with LCP-FRAP pre-crystallization assays, setting up LCP crystallization trials and harvesting crystals.
FAQs
Assembly proceeds in two linked additions on the inner surface of the cytoplasmic membrane. Undecaprenyl phosphate first receives a MurNAc-pentapeptide group, after which a GlcNAc residue is added to create the disaccharide-pentapeptide structure. This ordered sequence builds the complete precursor before it moves to the membrane-facing stage required for later cell wall construction.
Undecaprenyl phosphate acts as a membrane-associated carrier for the peptidoglycan building unit. By temporarily holding the MurNAc-pentapeptide and subsequent GlcNAc-containing structure, it keeps precursor assembly connected to the cytoplasmic membrane. Its carrier role links the early chemical steps with the later movement of the completed unit for cell wall production.
The completed precursor must be transferred from the inner surface to the opposite side of the cytoplasmic membrane before it can contribute to peptidoglycan assembly. This relocation separates precursor production from its use in the cell wall. Consequently, membrane transport is a distinct functional stage rather than simply another chemical addition to the growing precursor.
The pathway is essential because it supplies a precursor needed for the peptidoglycan mesh that maintains bacterial shape and helps prevent lysis. It also differs from processes in human cells, creating opportunities for selective antibacterial action. Drugs can therefore target precursor synthesis, transport across the membrane, or incorporation into the developing cell wall.
A useful analysis follows the pathway in sequence: identify the membrane-associated carrier, monitor attachment of the MurNAc-pentapeptide, assess addition of GlcNAc, and then consider movement of the completed precursor across the membrane. Linking each stage to its location and product helps distinguish precursor synthesis from transport and subsequent peptidoglycan incorporation.
The process requires the membrane carrier undecaprenyl phosphate, a MurNAc-pentapeptide unit, and a GlcNAc residue. These components are combined sequentially on the inner membrane surface to generate the disaccharide-pentapeptide precursor. Examining their order is important because the completed product depends on both the initial carrier-linked intermediate and the later sugar addition.
The pathway offers several intervention points that correspond to different biological stages. An agent blocking precursor synthesis prevents the required building unit from forming, whereas one affecting transport stops its membrane relocation. A compound that interferes with incorporation acts later during cell wall assembly. Comparing these effects helps connect antibacterial activity with a specific stage.
This pathway illustrates how bacterial cells coordinate membrane chemistry with construction of an external structural layer. Precursor production occurs on the inner membrane surface, transport changes its location, and incorporation supports the peptidoglycan mesh. Studying these linked stages clarifies how bacteria maintain shape and avoid lysis while also identifying processes absent from human cellular biology.