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Actin Filament Depolymerization

Actin Filament Depolymerization

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...

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.

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.

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...

Mechanism of Filopodia Formation

Mechanism of Filopodia Formation

Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...

Cytoskeletal Proteins in Bacteria

Cytoskeletal Proteins in Bacteria

Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...

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Updated: May 15, 2026

Aip1p Dynamics Are Altered by the R256H Mutation in Actin

Aip1p Dynamics Are Altered by the R256H Mutation in Actin

Published on: July 30, 2014

Molecular characterization of an actin depolymerizing factor from Cryptocaryon irritans.

Xiaohong Huang¹, Yang Xu, Guowei Guo

¹Fujian Provincial Key Laboratory of Developmental Biology and Neuroscience, College of Life Science, Fujian Normal University, Fuzhou, Fujian, China. biohxh@fjnu.edu.cn

|January 5, 2013

Summary

Researchers identified a novel actin depolymerizing factor (CiADF2) in the parasite Cryptocaryon irritans. This protein is involved in parasite movement and actin dynamics, offering potential targets for controlling cryptocaryonosis.

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Last Updated: May 15, 2026

Aip1p Dynamics Are Altered by the R256H Mutation in Actin

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Published on: July 30, 2014

A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues

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Published on: June 3, 2021

In Vitro Polymerization of F-actin on Early Endosomes

In Vitro Polymerization of F-actin on Early Endosomes

Published on: August 28, 2017

Area of Science:

Cell Biology
Parasitology
Molecular Biology

Background:

Actin depolymerizing factors (ADFs) are crucial for regulating actin dynamics in cellular processes.
Cryptocaryon irritans is a parasitic ciliate responsible for cryptocaryonosis, impacting marine life.

Purpose of the Study:

To clone and characterize a novel ADF gene (CiADF2) from Cryptocaryon irritans.
To investigate the function and localization of CiADF2 in the parasite.

Main Methods:

Cloning of CiADF2 cDNA and expression of recombinant protein (rCiADF2) in E. coli.
Reverse transcription-PCR for expression analysis and Western blot for protein confirmation.
Immunofluorescence and in vitro assays for protein localization and activity.

Main Results:

A novel ADF gene, CiADF2, was identified in C. irritans, encoding a 138-amino acid protein.
CiADF2 is expressed throughout the parasite's life cycle and localized around cytostomes.
Recombinant CiADF2 exhibits F-actin binding and depolymerizing activity.

Conclusions:

CiADF2 plays a role in parasite motility and actin dynamics.
Understanding CiADF2 function can aid in developing control strategies for cryptocaryonosis.