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Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
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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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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.
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Observing and Quantifying Fibroblast-mediated Fibrin Gel Compaction
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Mechanical basis for fibrillar bundle morphology.

Thomas C T Michaels1, Edvin Memet2, L Mahadevan3

  • 1Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.

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This study introduces a mechanical theory for fibril self-assembly, explaining diverse morphologies from biological filaments to synthetic nanotubes. The model reveals how nanoscale properties dictate mesoscale shapes, offering insights into complex structures.

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Area of Science:

  • Multidisciplinary research spanning molecular biology, supramolecular chemistry, and materials science.
  • Focus on the physical principles governing self-assembled fibrillar structures.

Background:

  • The morphology of self-assembled fibrillar structures is crucial in various scientific fields.
  • Understanding the factors that dictate these complex shapes remains a challenge.

Purpose of the Study:

  • To develop an effective mechanical theory for the spatial complexity of self-assembling fibrillar structures.
  • To link nanoscale mechanical properties to mesoscale fibril morphologies.

Main Methods:

  • A coarse-grained theoretical approach averaging over molecular details.
  • Modeling the interplay between filament elasticity (bending and twisting) and inter-filament adhesion.

Main Results:

  • The theory successfully captures diverse fibril morphologies, from biological filopodia to multi-walled carbon nanotubes.
  • A phase diagram of possible fibril shapes was generated.
  • Demonstrated extreme sensitivity leading to spatially chaotic structures.

Conclusions:

  • A common mechanical basis for mesoscale fibril morphology exists.
  • Nanoscale mechanical properties of constituents fundamentally influence self-assembled structures.
  • The framework provides insights into both natural and synthetic fibrillar systems.