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Related Concept Videos

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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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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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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The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
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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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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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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Filament dynamics in planar chemical gardens.

Luis A M Rocha1, Julyan H E Cartwright2, Silvana S S Cardoso1

  • 1Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, UK. lam99@cam.ac.uk.

Physical Chemistry Chemical Physics : PCCP
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Chemical garden filaments exhibit self-organized dispersion, leading to highly efficient fluid transport. This mechanism significantly enhances mixing in complex structures, surpassing molecular diffusion rates.

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Area of Science:

  • Complex Systems
  • Chemical Engineering
  • Statistical Mechanics

Background:

  • Chemical gardens form intricate, branching filament structures.
  • Transport phenomena within these complex environments are not well understood.
  • Understanding diffusion is crucial for applications involving fluid exchange.

Purpose of the Study:

  • To investigate the transport mechanisms of filaments in planar chemical gardens.
  • To quantify the effective diffusivity within these structures.
  • To explain the observed erratic growth patterns using statistical mechanics.

Main Methods:

  • Utilized statistical mechanics to model filament growth and dispersion.
  • Conducted 2D laboratory experiments to observe chemical garden formation.
  • Measured effective diffusivities using tracer experiments.

Main Results:

  • Filament growth follows tortuous and erratic paths.
  • A self-organized dispersion mechanism governs the scaling of filament growth.
  • Measured effective diffusivities reached up to 10^-5 m^2 s^-1.
  • This transport is four orders of magnitude greater than molecular diffusion.

Conclusions:

  • Self-organized dispersion is a key mechanism in chemical gardens.
  • The enhanced transport facilitates widespread fluid contact and exchange.
  • Findings have implications for understanding transport in complex, natural, and engineered systems.