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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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Studying the Cytoskeleton01:17

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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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Assembly of Cytoskeletal Filaments01:18

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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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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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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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Updated: Nov 1, 2025

ECM Protein Nanofibers and Nanostructures Engineered Using Surface-initiated Assembly
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Nanofibrils in nature and materials engineering.

Shengjie Ling1,2,3, David L Kaplan3, Markus J Buehler2,4,5

  • 1School of Physical Science and Technology, ShanghaiTech University, Shanghai, China.

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|June 25, 2021
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Researchers are developing sustainable, biocompatible nanofibrillar materials like cellulose, chitin, and silk by mimicking nature's hierarchical design. This approach yields advanced materials with tunable mechanical and optical properties for diverse applications.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Nanotechnology

Background:

  • Nanofibrillar biopolymers (cellulose, chitin, silk) exhibit hierarchical structures formed by self-assembly.
  • These materials possess remarkable mechanical strength, anisotropy, flexibility, and optical properties.
  • Their unique features make them promising for sustainable environmental, energy, optical, and biomedical applications.

Purpose of the Study:

  • To review hierarchical design strategies for cellulose, silk, and chitin nanofibrillar materials.
  • To explore fabrication methods for creating 2D and 3D structures.
  • To highlight the role of rational design in developing advanced biopolymer-based materials.

Main Methods:

  • Summarizing hierarchical design strategies focusing on nanoconfinement, fibrillar orientation, and alignment.
  • Investigating fabrication strategies for manufacturing nanofibril-based materials.
  • Analyzing mechanical and optical properties of designed architectures.

Main Results:

  • Hierarchical design enables the creation of strong, anisotropic, and responsive biopolymer materials.
  • Mimicking nature's multiscale assembly is key to engineering these advanced materials.
  • Specific strategies include nanoconfinement and controlled fibrillar alignment in 2D and 3D.

Conclusions:

  • Rational design of nanofibrillar biopolymers is crucial for developing high-performance sustainable materials.
  • The material-by-design paradigm offers a promising future for advanced biopolymer applications.
  • Further research into fabrication and design strategies will unlock new possibilities.