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Related Concept Videos

The Structure of Intermediate Filaments01:19

The Structure of Intermediate Filaments

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The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm).  These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
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Adaptability of Cytoskeletal Filaments01:12

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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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Formation of Intermediate Filaments00:57

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Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been...
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Disassembly of Intermediate Filaments01:35

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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
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Introduction to the Cytoskeleton01:33

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Overview of the Cytoskeleton
The cytoskeleton is a network of protein filaments present within the cell, having three distinct filaments ̶   microfilaments, microtubules, and intermediate filaments. Each has characteristic features that distinguish them, including the dynamics of their assembly and disassembly, mechanical properties, polarity, and the type of molecular motors associated with them. Earlier, they were thought to be present only in eukaryotic cells; however, their...
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Types of Intermediate Filaments01:31

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The intermediate filaments are an essential component of the cytoskeleton. Presently six types of intermediate filament have been identified. Type I and II are acidic and basic keratin proteins. Type III is of mesodermal origin and comprises four proteins: vimentin, desmin, glial fibrillary acidic protein (GFAP), and peripherin. Vimentin is commonly found in mesenchymal cells, desmin in muscle cells, GFAP in astrocytes, while peripherin is found in peripheral nervous system neurons (PNS). Type...
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Updated: Apr 24, 2026

Reconstituting and Characterizing Actin-Microtubule Composites with Tunable Motor-Driven Dynamics and Mechanics
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Intermediate filaments: a dynamic network that controls cell mechanics.

Yosef Gruenbaum1, Ueli Aebi2

  • 1Department of Genetics, Institute of Life Sciences, Hebrew University of Jerusalem Givat Ram, Jerusalem 91904 Israel.

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|September 4, 2014
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Summary
This summary is machine-generated.

Intermediate filaments (IFs) are key structural proteins in human cells. This review explores IF dynamics, modifications, and their roles in nuclear and cell mechanics, migration, and adhesion.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Structural Biology

Background:

  • Intermediate filaments (IFs) are a diverse protein superfamily encoded by over 70 human genes.
  • IFs form ~10 nm filaments crucial for structural integrity in the nucleus and cytoplasm.
  • They organize microtubule and microfilament networks, impacting cellular organization.

Purpose of the Study:

  • To review the dynamics of intermediate filament proteins.
  • To explore how post-translational modifications regulate IF dynamics.
  • To discuss the role of IF organization in nuclear and cellular mechanics, migration, and adhesion.

Main Methods:

  • Literature review of intermediate filament research.
  • Analysis of studies on IF protein modifications.
  • Synthesis of findings on IFs' roles in cellular functions.

Main Results:

  • IF dynamics are complex and regulated by various modifications.
  • Nuclear IF organization influences nuclear mechanics.
  • Cytoplasmic IFs are vital for cell stiffness, lamellipodia formation, migration, and adhesion.

Conclusions:

  • Intermediate filaments are dynamic structures critical for cellular architecture and function.
  • Understanding IF regulation offers insights into cell mechanics and disease.
  • IFs play multifaceted roles from nuclear organization to cell migration.