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Related Concept Videos

Structural Protein Function01:56

Structural Protein Function

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to...
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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.
Intermediate...
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Types of Intermediate Filaments01:31

Types of Intermediate Filaments

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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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Formation of Intermediate Filaments00:57

Formation of Intermediate Filaments

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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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Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

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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...
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Disassembly of Intermediate Filaments01:35

Disassembly of Intermediate Filaments

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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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Related Experiment Video

Updated: May 1, 2026

Isolation of Intermediate Filament Proteins from Multiple Mouse Tissues to Study Aging-associated Post-translational Modifications
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Introducing intermediate filaments: from discovery to disease.

John E Eriksson1, Thomas Dechat, Boris Grin

  • 1Department of Biology, Abo Akademi University, Turku, Finland. john.eriksson@abo.fi

The Journal of Clinical Investigation
|July 10, 2009
PubMed
Summary
This summary is machine-generated.

Intermediate filaments (IFs) are a unified protein family found in most cells. Recent research reveals their crucial roles in diseases, extending beyond structural integrity to newly defined non-mechanical functions.

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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Medicine

Background:

  • Intermediate filaments (IFs) were recognized as a unified protein family over a century ago.
  • These proteins are ubiquitous in differentiated cells, located in both cytoplasm and nucleus.
  • Traditionally, IF functions were linked to cellular structural and mechanical integrity.

Purpose of the Study:

  • To review the expanding knowledge of intermediate filament functions.
  • To highlight the diverse roles of IFs in disease pathogenesis.
  • To emphasize the importance of recently discovered non-mechanical functions of IFs.

Main Methods:

  • Review of existing scientific literature on intermediate filaments.
  • Analysis of disease mechanisms related to IF dysfunction.
  • Synthesis of recent findings on IF non-mechanical roles.

Main Results:

  • Knowledge of IF functions has rapidly expanded in the last two decades.
  • Numerous disease-related roles for IFs have been identified.
  • Some diseases involve disturbances in traditional mechanical IF functions.
  • Many disease conditions are linked to non-mechanical IF functions, recently defined.

Conclusions:

  • Intermediate filaments are critical for cellular health and disease.
  • Understanding both mechanical and non-mechanical functions is vital for comprehending IF-related pathologies.
  • Further research into the non-mechanical roles of IFs is essential for future therapeutic strategies.