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Generation of Straight or Branched Actin Filaments01:14

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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 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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The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
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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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A generalized theoretical framework to investigate multicomponent actin dynamics.

Mintu Nandi1, Shashank Shekhar2, Sandeep Choubey3,4

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

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|September 8, 2025
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Summary
This summary is machine-generated.

A new kinetic model explains how multiple proteins regulate actin filament length. This framework helps analyze experimental data and understand complex cellular dynamics in vivo.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Actin filament length is crucial for cellular functions.
  • Individual actin-binding proteins' roles are known, but their combined effects on dynamics in vivo are unclear.
  • Existing microscopy techniques provide high-throughput data, but a theoretical framework is lacking.

Purpose of the Study:

  • To develop a general kinetic model for multicomponent regulation of actin dynamics.
  • To provide a theoretical framework for understanding how numerous proteins collectively control actin filament length.
  • To enable mechanistic interpretation of experimental data on actin dynamics.

Main Methods:

  • Proposed a general kinetic model for actin dynamics.
  • Incorporated the combined effects of an arbitrary number of regulatory proteins.
  • Derived exact closed-form expressions for moments of filament length distributions.

Main Results:

  • The derived moments can distinguish between different multicomponent regulatory mechanisms.
  • The model provides quantitative predictions for actin filament length distributions over time.
  • The framework successfully integrates effects of multiple actin-binding proteins.

Conclusions:

  • The proposed kinetic model offers a unified theoretical framework for actin dynamics.
  • This framework is essential for interpreting complex experimental data in cell biology.
  • It will guide future experiments investigating multicomponent regulation of actin.