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Related Concept Videos

Actin Filament Depolymerization01:19

Actin Filament Depolymerization

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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
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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.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
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Actin Polymerization01:42

Actin Polymerization

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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
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Formation of Intermediate Filaments00:57

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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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Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
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Destabilization of Microtubules01:45

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The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Fragmentation and depolymerization of non-covalently bonded filaments.

A Zaccone1, I Terentjev2, L Di Michele3

  • 1Physics Department and Institute for Advanced Study, Technische Universität München, 85748 Garching, Germany.

The Journal of Chemical Physics
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Protein filament disassembly is not uniform. Filament flexibility and bond asymmetry determine where bonds break, impacting protein assembly dynamics and providing a unified model for depolymerization.

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Area of Science:

  • Biophysics
  • Biochemistry
  • Materials Science

Background:

  • Protein molecules self-assemble into filaments via non-covalent bonds.
  • Filament growth kinetics are limited by subunit disassembly rates due to thermal motion.
  • Current models often assume uniform or central dissociation, but F-actin depolymerization is end-specific due to biochemical factors.

Purpose of the Study:

  • To investigate the factors controlling the location of subunit dissociation in protein filaments.
  • To develop a general model for biopolymer fragmentation and depolymerization.
  • To connect interaction potential features to breakup topology.

Main Methods:

  • Brownian dynamics simulations.
  • Theoretical modeling.
  • Analysis of general (generic) models for protein filament assembly.

Main Results:

  • Filament breakup location is strongly influenced by the asymmetry of the binding force and filament bending stiffness.
  • For flexible filaments, dissociation is maximal in the middle.
  • For semiflexible or stiff filaments, dissociation is minimal in the middle or uniform.

Conclusions:

  • A unifying framework for understanding biopolymer fragmentation and depolymerization is established.
  • The study reveals a direct link between subunit interaction potential and breakup patterns.
  • The model reconciles previous findings in different physical limits.