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Disassembly of Intermediate Filaments01:35

Disassembly of Intermediate Filaments

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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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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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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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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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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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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions
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Distinct disassembly modes shape cytoskeletal assembly and fluctuations.

Md Sorique Aziz Momin1, Michaela Cohen2, Lishibanya Mohapatra1

  • 1School of Physics and Astronomy, College of Science, Rochester Institute of Technology, Rochester, NY, USA.

Biophysical Reports
|April 26, 2026
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Summary
This summary is machine-generated.

Cytoskeletal structures maintain size through disassembly. Severing, a size-dependent disassembly model, accelerates assembly and regulates multiple structures from a shared pool more effectively than constant monomer loss.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Cytoskeletal structures must assemble and maintain characteristic sizes from shared subunit pools.
  • Disassembly mechanisms and subunit pool replenishment are crucial for cytoskeletal regulation.
  • Understanding how different disassembly modes impact assembly dynamics is key.

Purpose of the Study:

  • To compare two cytoskeletal disassembly models: constant monomer loss and size-dependent severing.
  • To investigate the effects of these models on the assembly of filaments and bundles, both individually and from a shared pool.
  • To identify key parameters and measurable quantities that distinguish between disassembly mechanisms.

Main Methods:

  • Analytical calculations and computational simulations were employed.
  • The study analyzed the assembly kinetics and length fluctuation dynamics of cytoskeletal structures.
  • Two disassembly models were compared: constant monomer loss rate and size-dependent severing.

Main Results:

  • Both disassembly models regulate structure size, but severing accelerates assembly to steady-state size.
  • Severing leads to faster decay in length fluctuation autocorrelations.
  • Severing effectively constrains multiple structures assembling from a shared pool to defined sizes.

Conclusions:

  • Severing is a more effective mechanism for rapid assembly and size regulation of cytoskeletal structures, especially from a shared pool.
  • Measurable quantities like coefficient of variation and bundle tapering can differentiate between disassembly mechanisms.
  • This study provides a framework for experimental identification of assembly-control mechanisms in cytoskeletal dynamics.