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Generation of Straight or Branched Actin Filaments

Generation of Straight or Branched Actin Filaments

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.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...

Formation of Higher-order Actin Filaments

Formation of Higher-order Actin Filaments

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 networks...

Actin Polymerization

Actin Polymerization

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 actin...

Actin Polymerization and Cell Motility

Actin Polymerization and Cell Motility

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.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate.

Spindle Assembly

Spindle Assembly

Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...

Introduction to Actin

Introduction to Actin

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 different species.

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Related Experiment Video

Updated: May 19, 2026

Reconstitution of Actin-Based Motility with Commercially Available Proteins

Reconstitution of Actin-Based Motility with Commercially Available Proteins

Published on: October 28, 2022

Actin nucleators in the nucleus: an emerging theme.

Louise Weston¹, Amanda S Coutts, Nicholas B La Thangue

¹Laboratory of Cancer Biology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Oxford OX3 7DQ, UK. nick.lathangue@oncology.ox.ac.uk

Journal of Cell Science

|September 1, 2012

Summary

Actin nucleation factors, typically cytoplasmic, are found in the nucleus, suggesting a role in connecting cellular structures and nuclear events. Their nuclear presence may link cytoskeletal dynamics to gene regulation and stress responses.

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Published on: October 28, 2022

Validation of a Mouse Model to Disrupt LINC Complexes in a Cell-specific Manner

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A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton

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Published on: July 29, 2018

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Actin is crucial for cytoskeleton formation and cellular functions.
Actin is also found in the nucleus, involved in chromatin remodeling and gene transcription.
Typical actin filaments have not been directly observed in the nucleus.

Purpose of the Study:

To explore the evidence for nuclear roles of actin nucleation factors.
To investigate the potential link between cytoskeletal actin and nuclear events.
To consider the role of actin-associated proteins in signal transduction to the nucleus.

Main Methods:

Literature review and commentary on existing studies.
Analysis of evidence for nuclear localization of actin nucleation factors.
Discussion of implications for cytoskeleton-nucleus communication.

Main Results:

Nuclear localization of actin nucleation factors has been demonstrated.
These factors promote actin polymerization, suggesting a functional role in the nucleus.
Evidence suggests a collaboration between the cytoskeleton and the nucleus mediated by actin.

Conclusions:

Actin nucleation factors may bridge cytoplasmic and nuclear functions.
The nuclear roles of actin and its associated proteins are significant for gene regulation and cellular stress response.
Further research is needed to fully elucidate the physiological relevance of nuclear actin dynamics.