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Related Concept Videos

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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
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Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution.  Actin coding genes are conserved within species and across...
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Actin Polymerization01:42

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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Updated: Jun 4, 2025

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A generalized theoretical framework to investigate multicomponent actin dynamics.

Mintu Nandi1, Shashank Shekhar2, Sandeep Choubey3

  • 1Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, India.

Biorxiv : the Preprint Server for Biology
|December 23, 2024
PubMed
Summary
This summary is machine-generated.

We developed a kinetic model to understand how multiple actin-binding proteins regulate actin filament length dynamics. This framework helps interpret experimental data and guide future research on cellular actin regulation.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Actin filament length is crucial for cellular functions.
  • Hundreds of actin-binding proteins regulate actin dynamics.
  • Current understanding of multicomponent regulation is limited.

Purpose of the Study:

  • To develop a theoretical framework for understanding multicomponent regulation of actin dynamics.
  • To provide a mechanistic understanding of how multiple actin-binding proteins collectively control actin filament length.
  • To enable interpretation of experimental data on actin dynamics.

Main Methods:

  • Proposed a general kinetic model for actin filament regulation.
  • Derived closed-form expressions for filament length distribution moments.
  • The model captures the combined effects of multiple regulatory proteins.

Main Results:

  • The kinetic model successfully describes the combined action of multiple actin-binding proteins.
  • Provided expressions for time-dependent and steady-state moments of filament length distribution.
  • The framework can differentiate between various regulatory mechanisms.

Conclusions:

  • The proposed kinetic model offers a unified theoretical framework for actin dynamics.
  • This approach facilitates the interpretation of experimental data and future research directions.
  • Advances understanding of how proteins collectively regulate actin filament length in vivo.