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Related Concept Videos

Introduction to Actin01:26

Introduction to Actin

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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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Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

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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.
The high-order actin...
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Cytoskeletal Accessory Proteins01:13

Cytoskeletal Accessory Proteins

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The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...
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Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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Actin Filament Depolymerization01:19

Actin Filament Depolymerization

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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).
In F-actin, the ADF/cofilin proteins...
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Actin Polymerization01:42

Actin Polymerization

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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.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight...
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Related Experiment Video

Updated: Aug 3, 2025

Reconstitution of Actin-Based Motility with Commercially Available Proteins
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Actin's C-terminus coordinates actin structural changes and functions.

Karl E Steffensen1, John F Dawson1

  • 1Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada.

Cytoskeleton (Hoboken, N.J.)
|April 10, 2023
PubMed
Summary

The flexible C-terminus of actin is crucial for its function and interactions with actin-binding proteins (ABPs). Modern techniques now allow detailed study of this essential actin region.

Keywords:
C-terminusactinallosteryfunctionstructure

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cell Biology

Background:

  • Actin is a fundamental protein in eukaryotic cells, essential for various cellular processes.
  • The C-terminus of actin plays a critical role in modulating actin's structure, properties, and interactions with actin-binding proteins (ABPs).
  • Studying the actin C-terminus has been challenging due to its flexibility and limitations in traditional structural biology techniques like X-ray crystallography and electron microscopy.

Purpose of the Study:

  • To review existing knowledge on the importance of the actin C-terminus in structural changes and cellular functions.
  • To discuss how advanced structural characterization techniques can elucidate the role of the actin C-terminus.
  • To highlight the significance of C-terminal flexibility and integrity for actin function.

Main Methods:

  • Review of existing biochemical and structural studies on actin.
  • Analysis of recent advances in electron microscopy (EM) for high-resolution structural determination.
  • Integration of knowledge on actin's allosteric networks and C-terminal mediated changes.

Main Results:

  • Biochemical studies confirm the necessity of C-terminal flexibility for modulating actin structure and function.
  • C-terminal structural changes influence nucleotide binding, exchange, and propagate allosteric signals.
  • High-resolution cryo-EM structures reveal subtle structural modifications mediated by the actin C-terminus.

Conclusions:

  • The actin C-terminus is vital for regulating actin's dynamic structure and interactions with ABPs.
  • Modern structural biology, particularly cryo-EM, offers unprecedented insights into the C-terminus's role.
  • Understanding the C-terminus is key to comprehending fundamental cellular processes involving actin.