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Related Concept Videos

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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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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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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The Structure of Intermediate Filaments01:19

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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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Elevation of Intermediate Points on Vertical Curves01:20

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Vertical curves are essential in roadway design because they provide smooth transitions between varying roadway grades. Designing vertical curves involves calculating intermediate elevations and identifying the curve's highest or lowest point, which is essential for optimal roadway performance.Intermediate elevations on a vertical curve are determined using the tangent offset method. This method considers the initial elevation at the start of the curve, the grades, and the curve's geometry. The...
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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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Updated: Jan 27, 2026

Imaging Intermediate Filaments and Microtubules with 2-dimensional Direct Stochastic Optical Reconstruction Microscopy
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Helical Superstructure of Intermediate Filaments.

Lila Bouzar1, Martin Michael Müller2,3, René Messina2

  • 1Laboratoire de Physique des Matériaux, USTHB, BP 32 El-Alia Bab-Ezzouar, 16111 Alger, Algeria.

Physical Review Letters
|April 2, 2019
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Summary
This summary is machine-generated.

Intermediate filaments exhibit unique helical superstructures and autocoiling, a novel elastic instability, when confined in microfluidic channels. This discovery explains their looped shapes and offers insights into cytoskeletal mechanics.

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Area of Science:

  • Cytoskeletal biology
  • Biophysics
  • Materials science

Background:

  • Intermediate filaments (IFs) are crucial cytoskeletal components, yet their structural properties remain less understood compared to actin and microtubules.
  • Their behavior in confined environments, relevant to cellular processes, is largely unexplored.

Purpose of the Study:

  • To investigate the structural behavior of intermediate filaments in narrow microfluidic channels.
  • To identify the underlying mechanisms responsible for observed conformational anomalies.

Main Methods:

  • Utilizing microfluidic confinement to study intermediate filament behavior.
  • Analyzing structural correlations and conformational changes using advanced imaging and biophysical techniques.

Main Results:

  • Intermediate filaments display significant conformational anomalies in microfluidic channels, revealing a large-scale helical superstructure.
  • Confinement induces ordering and enhances structural correlations, leading to detectable oscillating tangent correlation functions.
  • A novel elastic shape instability, termed 'autocoiling,' is proposed to explain intrinsic filament curving due to self-induced buckling and surface stress.

Conclusions:

  • The study reveals a previously undetected helical superstructure in intermediate filaments, explaining their characteristic looped morphology.
  • Autocoiling, a new mechanism of elastic shape instability, governs filament curvature in confined spaces.
  • Further research is needed to elucidate the molecular origins of helical torsion in intermediate filaments.