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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.
Intermediate...
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Generation of Straight or Branched Actin Filaments01:14

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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
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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.
The high-order actin...
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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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Fibrous Proteins00:55

Fibrous Proteins

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Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...
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Microtubules in Cell Motility01:24

Microtubules in Cell Motility

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Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...
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Related Experiment Video

Updated: Mar 9, 2026

Microdissection of Black Widow Spider Silk-producing Glands
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Published on: January 11, 2011

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Nanoscale Structural Features in Major Ampullate Spider Silk.

Christian Riekel1, Manfred Burghammer1,2, Thomas G Dane1

  • 1The European Synchrotron (ESRF) , CS40220, F-38043 Grenoble Cedex 9, France.

Biomacromolecules
|December 22, 2016
PubMed
Summary

Spider silk

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Microdissection of Black Widow Spider Silk-producing Glands
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Area of Science:

  • Biomaterials Science
  • Materials Science
  • Structural Biology

Background:

  • Spider major ampullate silk is typically viewed as a simple two-phase material.
  • Its complex nanoscale organization remains incompletely understood.

Purpose of the Study:

  • To investigate the intricate nanoscale structure of Argiope bruennichi dragline-type spider silk fibers.
  • To reveal transversal structural features and the arrangement of crystalline and amorphous components.

Main Methods:

  • Scanning X-ray nanodiffraction was employed to probe the silk fibers.
  • High-resolution analysis was used to resolve structural features at the nanoscale.

Main Results:

  • A distinct ~1 μm skin layer composed of ~100 nm diameter nanofibrils was identified, likely functioning as an elastic sheath.
  • The core revealed a composite structure with nanometer-sized crystalline nanodomains (poly(l-alanine) microstructure) embedded in an amorphous polypeptide network.
  • Nanofibrils with periodic axial density modulation were observed, consisting of stacked nanodomains separated by less ordered segments.
  • Larger β-type nanocrystallites in the outer core-shell were attributed to MaSp1 protein precipitation.

Conclusions:

  • Spider dragline silk exhibits a more complex hierarchical nanoscale organization than previously depicted.
  • The identified structural features, including the skin layer and core nanofibrils, contribute to the silk's unique mechanical properties.
  • MaSp1 protein plays a role in the formation of nanocrystallites within the silk's outer layers.