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Related Concept Videos

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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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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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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Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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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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Formation of Higher-order Actin Filaments01:11

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The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
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Updated: Oct 18, 2025

Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Molecular Interactions Driving Intermediate Filament Assembly.

Pieter-Jan Vermeire1, Giel Stalmans1, Anastasia V Lilina1

  • 1Laboratory for Biocrystallography, KU Leuven, 3000 Leuven, Belgium.

Cells
|September 28, 2021
PubMed
Summary
This summary is machine-generated.

Understanding intermediate filament (IF) structure is crucial for cell physiology and disease research. Recent advances in chemical cross-linking and cryo-electron microscopy are key to unlocking the remaining mysteries of IF assembly.

Keywords:
X-ray crystallographyassemblychemical analytical cross-linkingcryoelectron microscopyintermediate filamentkeratinlaminvimentin

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Structural Biology

Background:

  • Intermediate filaments (IFs) are vital for cell physiology and implicated in numerous diseases.
  • Decades of research have elucidated aspects of IF structure, including dimer and tetramer formation.
  • However, the molecular mechanisms of later filament assembly stages remain incompletely understood.

Purpose of the Study:

  • To summarize current knowledge on intermediate filament (IF) structure.
  • To highlight recent advancements in understanding IF assembly, particularly for cytoplasmic IFs.
  • To identify remaining challenges and propose future research directions.

Main Methods:

  • Review of existing literature on IF structure.
  • Analysis of data from chemical cross-linking experiments, including recent studies on lamin filament assembly.
  • Discussion of the utility of X-ray crystallography, chemical cross-linking, and cryo-electron microscopy (cryo-EM).

Main Results:

  • Atomic resolution structures exist for IF dimer and tetramer formation.
  • Chemical cross-linking experiments have provided significant insights into cytoplasmic IF assembly.
  • Recent applications of improved cross-linking techniques have yielded new data on lamin filament assembly.

Conclusions:

  • Further elucidation of IF molecular structure requires advanced techniques.
  • Chemical cross-linking and cryo-electron microscopy are poised to drive future breakthroughs in IF structure research.
  • Addressing open questions in IF assembly is critical for understanding IF-linked diseases.