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Related Concept Videos

The Structure of Intermediate Filaments01:19

The Structure of Intermediate Filaments

5.6K
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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Disassembly of Intermediate Filaments01:35

Disassembly of Intermediate Filaments

2.6K
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...
2.6K
Types of Intermediate Filaments01:31

Types of Intermediate Filaments

4.8K
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...
4.8K
Formation of Intermediate Filaments00:57

Formation of Intermediate Filaments

3.9K
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...
3.9K
Structural Protein Function01:56

Structural Protein Function

29.8K
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...
29.8K
Reaction Mechanisms03:06

Reaction Mechanisms

30.5K
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
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Related Experiment Video

Updated: Jan 22, 2026

Imaging Intermediate Filaments and Microtubules with 2-dimensional Direct Stochastic Optical Reconstruction Microscopy
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Imaging Intermediate Filaments and Microtubules with 2-dimensional Direct Stochastic Optical Reconstruction Microscopy

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Intermediate Filaments: Structure-Mechanics Crosstalk.

Sarah Köster1, Harald Herrmann2

  • 1University of Göttingen, Institute for X-Ray Physics, Göttingen, Germany. sarah.koester@uni-goettingen.de.

Sub-Cellular Biochemistry
|January 20, 2026
PubMed
Summary
This summary is machine-generated.

Intermediate filaments (IFs) are unique, stable fibrous proteins. Their structure dictates their mechanical properties, offering insights into cellular mechanics and biomaterials.

Keywords:
Bending rigidityCoiled-coilCytoskeletonKeratinMolecular structurePersistence lengthStress-strain relationshipVimentinα helix

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Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers
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Imaging Intermediate Filaments and Microtubules with 2-dimensional Direct Stochastic Optical Reconstruction Microscopy
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Isolation of Intermediate Filament Proteins from Multiple Mouse Tissues to Study Aging-associated Post-translational Modifications
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Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers
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Area of Science:

  • Biophysics
  • Cell Biology
  • Materials Science

Background:

  • Intermediate filaments (IFs) are a major cytoskeletal component.
  • IFs possess distinct mechanical properties compared to actin and microtubules.
  • Their unique structure underlies their mechanical behavior.

Purpose of the Study:

  • To elucidate the structure-mechanics relationship of intermediate filaments.
  • To understand the assembly process and mechanical properties of IFs.
  • To explore potential applications in biomimetic materials.

Main Methods:

  • Advanced experimental techniques (optical tweezers, atomic force microscopy).
  • Sophisticated data analysis and numeric modeling.
  • Biochemical extraction and in vitro assembly studies.

Main Results:

  • IFs exhibit high flexibility, extensibility, and stability.
  • Characterized the assembly of tetrameric complexes into 10-nm filaments.
  • Measured piconewton forces and micrometer length scales, revealing low bending rigidity.

Conclusions:

  • The molecular structure of IFs directly dictates their mechanical properties.
  • Understanding IF mechanics provides insights into cellular mechanical roles.
  • IFs serve as a model for developing novel biomimetic materials.