Actin Cortex Reconstitution
Actin Cortex Reconstitution - Related Videos
08:40
Reconstitution of Actin-Based Motility with Commercially Available Proteins
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Cited by 2 •
2022
This protocol describes how to produce actin comets on the surfaces of beads using commercially available protein ingredients. Such systems mimic the protrusive structures found in cells, and can be used to examine physiological mechanisms of force production in a simplified way.
10:19
In Vitro Reconstitution of the Actin Cytoskeleton Inside Giant Unilamellar Vesicles
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Cited by 5 •
2022
In this manuscript, we demonstrate the experimental techniques to encapsulate the F-actin cytoskeleton into giant unilamellar lipid vesicles (also called liposomes), and the method to form a cortex-biomimicking F-actin layer at the inner leaflet of the liposome membrane.
11:55
Reconstitution of Membrane-Tethered Minimal Actin Cortices on Supported Lipid Bilayers
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Cited by 4 •
2022
This protocol describes the formation of supported lipid bilayers and the addition of cytoskeletal filaments and motor proteins to study the dynamics of reconstituted, membrane-tethered cytoskeletal networks using fluorescence microscopy.
10:13
Quantification of Filamentous Actin (F-actin) Puncta in Rat Cortical Neurons
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Cited by 8 •
2016
Filamentous actin (F-actin) plays an important role in spinogenesis, synaptic plasticity, and synaptic stability. Quantification of F-actin puncta is therefore a useful tool to study the integrity of synaptic structures. This protocol describes the procedures of quantifying F-actin puncta labeled with Phalloidin in low-density primary cortical neuronal cultures.
12:15
In Vitro Polymerization of F-actin on Early Endosomes
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Cited by 3 •
2017
Early endosome functions depend on F-actin polymerization. Here, we describe a microscopy-based in vitro assay that reconstitutes the nucleation and polymerization of F-actin on early endosomal membranes in test tubes, thus rendering this complex series of reactions amenable to biochemical and genetic manipulations.
FAQs
Membrane anchoring localizes polymerizing actin to the membrane or a membrane mimic instead of leaving the network distributed freely in solution. This attachment provides the physical connection needed to examine how actin organization affects membrane-associated mechanics. By changing the contribution of anchoring proteins, researchers can distinguish effects caused by network assembly from those caused by membrane attachment.
Cross-linkers organize actin filaments into network architectures, whereas myosin motors generate active forces within that network. Their effects can therefore be examined separately or together: cross-linkers tune structural organization, while motors influence force production and contractility. This distinction helps reveal how cytoskeletal structure and motor activity cooperate to produce mechanical behavior.
The main controllable variables are actin assembly, membrane attachment, network cross-linking, and myosin activity. Each changes a different aspect of the system: assembly establishes the network, attachment couples it to the membrane, cross-linking tunes architecture, and motors drive active force generation. Comparing these variables allows researchers to identify which ingredients produce particular mechanical outcomes.
A typical workflow begins with purified actin and a membrane or membrane mimic that carries anchoring proteins. Actin is then allowed to polymerize at that interface, after which cross-linkers and myosin motors can be incorporated to adjust network organization and contractility. The resulting system provides a controlled preparation for testing how specific components alter actin-associated mechanics.
Minimal models reduce the number of interacting cellular components, making it possible to separate actin assembly, membrane attachment, and motor activity. This controlled setting supports quantitative tests that are difficult to isolate in intact cells, where many processes occur simultaneously. Results from the reconstituted system can therefore clarify how particular cytoskeletal forces contribute to larger cellular behaviors.
These systems can be used to investigate how cytoskeletal forces contribute to cell shape, polarity, adhesion, migration, and cytokinesis. They also support synthetic-cell design by testing whether selected actin, anchoring, cross-linking, and motor components can generate defined mechanical behaviors. The approach connects molecular organization with the physical processes that shape cellular function.