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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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Spindle Assembly02:50

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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
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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 Mitotic Spindle02:27

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The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
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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.
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Related Experiment Video

Updated: Nov 1, 2025

Microfluidic Dry-spinning and Characterization of Regenerated Silk Fibroin Fibers
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Mesoscale structure development reveals when a silkworm silk is spun.

Quan Wan1, Mei Yang1, Jiaqi Hu1

  • 1College of Animal Science, Zhejiang University, Hangzhou, China.

Nature Communications
|June 18, 2021
PubMed
Summary

Researchers arrested the silk spinning process to reveal three key structure development stages. This study defines the critical consolidation phase and the role of water pockets in silk fiber formation.

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Area of Science:

  • Biomaterials Science
  • Polymer Science
  • Textile Engineering

Background:

  • Silk fiber mechanical properties arise from a complex multi-scale hierarchical structure formed during spinning.
  • Understanding the sequential events in silk spinning is crucial for controlling fiber properties.

Purpose of the Study:

  • To investigate the mesoscale structural changes during silk fiber formation.
  • To identify and characterize the distinct stages of silk structure development.
  • To define the consolidation phase and the role of transient water pockets.

Main Methods:

  • Ex vivo processing of Bombyx mori silkworm silk solution to arrest the spinning process.
  • Analysis of mesoscale structures, including the emergence and disappearance of 'water pockets'.
  • Modeling and validation of post-draw processing effects on mechanical properties and hierarchical structure.

Main Results:

  • Identified three key stages: gelation, fibrilization, and consolidation.
  • Characterized 'water pockets' as transient structures resulting from protein dehydration, phase separation, and nanofibril assembly.
  • Demonstrated that nanofibril coalescence during consolidation removes water pockets and refines hierarchical structure.
  • Validated that post-draw processing enhances mechanical properties.

Conclusions:

  • The consolidation phase is critical, marked by water pocket removal via nanofibril coalescence.
  • Insights into spinning events enable a robust definition of 'spun' silk.
  • Understanding these stages allows for better control over silk fiber properties and potential applications.