Cellular Organelle Separation
Cellular Organelle Separation - Related Videos
15:39
Studying Organelle Dynamics in B Cells During Immune Synapse Formation
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Cited by 8 •
2019
Herein we describe two approaches to characterize cell polarization events in B lymphocytes during the formation of an IS. The first, involves quantification of organelle recruitment and cytoskeleton rearrangements at the synaptic membrane. The second is a biochemical approach, to characterize changes in composition of the centrosome, which undergoes polarization to the immune synapse.
08:47
Quantitative Approaches for Studying Cellular Structures and Organelle Morphology in Caenorhabditis elegans
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Cited by 2 •
2019
This study outlines quantitative measurements of synaptic size and localization, muscle morphology, and mitochondrial shape in C. elegans using freely available image processing tools. This approach allows future studies in C. elegans to quantitatively compare the extent of tissue and organelle structural changes as a result of genetic mutations.
07:29
Separating Protein with SDS-PAGE
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2023
Sodium Dodecyl Sulfate Poly-Acrylamide Gel Electrophoresis, or SDS-PAGE, is a widely-used technique for separating mixtures of proteins based on their size and nothing else. SDS, an anionic detergent, is used to produce an even charge across the length of proteins that have been linearized. By first loading them into a gel made of polyacrylamide and then applying an electric field to the gel, SDS-coated proteins are then separated. The electric field acts as the driving force, drawing the SDS...
07:29
A high-throughput method to globally study the organelle morphology in S. cerevisiae
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Cited by 2 •
2009
GFP-fusion proteins are widely used to visualize organelles by confocal microscopy. However, screening for mutations that affect the morphology of organelles generally requires individual mutagenesis and is time consuming. Here, we demonstrate a method to simultaneously incorporate organelle-GFP markers in almost 5,000 non-essential genes in yeast.
01:43
The Movement of Organelles and Vesicles
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2023
In eukaryotic cells, cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
FAQs
Differential centrifugation separates organelles through sequential increases in centrifugal force. During each stage, structures sediment according to their size and sedimentation behavior, forming pellets that can be collected separately. This staged approach helps reduce the complexity of the original disrupted-cell mixture before individual analysis.
Density-gradient centrifugation adds a second basis for resolution: buoyant density. Components that may remain together after differential centrifugation can be further resolved when they behave differently in the gradient. This step is therefore useful when researchers need cleaner organelle fractions for measurements of composition, enzyme activity, membrane properties, or metabolism.
Mixed fractions can produce measurements that reflect several intracellular compartments rather than one. Separating organelles helps chemists associate an observed enzyme activity, membrane property, molecular composition, or metabolic feature with a specific fraction. Reducing interference strengthens interpretation, because the measured signal is less likely to arise from unrelated structures carried through the preparation.
A typical workflow begins with controlled cell lysis to release intracellular structures while preparing the sample for fractionation. The disrupted material then undergoes centrifugation in stages, with centrifugal force increased sequentially so different components form pellets. If greater resolution is needed, density-gradient centrifugation follows or complements this sequence to separate components by buoyant density.
Controlled cell lysis establishes the starting material for downstream fractionation by disrupting cells and releasing their intracellular structures. Its importance in the workflow is practical: without this release, centrifugation cannot act on organelles as separate sedimenting components. In chemistry experiments, the resulting preparation provides the material needed to compare organelle-associated properties across collected fractions.
Collected fractions can be analyzed for organelle composition, enzyme activity, membrane properties, and aspects of intracellular metabolism. These readouts give chemistry researchers a way to connect a molecular or biochemical observation with a cellular compartment instead of treating the disrupted-cell sample as chemically uniform. The approach therefore supports compartment-specific interpretation in biochemical and related life-science studies.