F-actin Binding
F-actin Binding - Related Videos
06:17
Measuring Protein Binding to F-actin by Co-sedimentation
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Cited by 18 •
2017
This protocol describes a method to test the ability of a protein to co-sediment with filamentous actin (F-actin) and, if binding is observed, to measure the affinity of the interaction.
07:53
Actin Co-Sedimentation Assay; for the Analysis of Protein Binding to F-Actin
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Cited by 18 •
2008
Proteins bind to filamentous actin (F-actin) through distinct actin binding modules. In this video we demonstrate the procedure of actin co-sedimentation, which is an in vitro assay routinely used to analyze proteins or specific domains that bind F-actin.
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.
08:37
Study of the Actin Cytoskeleton in Live Endothelial Cells Expressing GFP-Actin
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Cited by 33 •
2011
Microscopic imaging of live endothelial cells expressing GFP-actin allows characterization of dynamic changes in cytoskeletal structures. Unlike techniques that use fixed specimens, this method provides a detailed assessment of temporal changes in the actin cytoskeleton in the same cells before, during, and after various physical, pharmacological, or inflammatory stimuli.
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
The outcome depends on what the binding partner does after contacting the filament. Some interactions stabilize existing F-actin, whereas others influence whether filaments assemble or disassemble. This distinction matters because binding can either preserve a cytoskeletal structure or remodel it, allowing cells to adjust organization and movement in response to changing biological needs.
Crosslinking converts individual actin filaments into organized networks by connecting them to one another. Those networks provide a structural framework that can support cell shape and coordinate mechanical behavior. Consequently, identifying crosslinking interactions helps explain how local filament associations become larger cytoskeletal arrangements rather than remaining isolated molecular contacts.
Binding can regulate access to actin filaments for motor proteins. When a molecule occupies or changes an interaction site, it may influence whether a motor can engage the filament and contribute to intracellular transport. This provides a mechanism linking filament organization with the directed movement of materials inside cells.
F-actin binding is especially informative in processes that require coordinated changes in cell structure. In migration and adhesion, binding interactions help connect filament organization with movement and cellular attachment. During cytokinesis, they provide context for understanding how actin-dependent organization contributes to cell division. Studying these settings reveals how one interaction type supports distinct cellular outcomes.
Researchers can focus on the interaction site and then determine its effect on the filament system: stabilization, assembly or disassembly, crosslinking, or altered motor access. Classifying the observed effect connects a molecular association to a cellular function and helps organize findings about cytoskeletal network architecture.
These interactions are useful tools for examining cellular mechanics and signaling because they connect molecular binding with changes in filament organization. They also provide a framework for studying diseases linked to abnormal actin regulation. Comparing which binding effects are altered can help relate disrupted cytoskeletal control to changes in cell behavior.