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Related Concept Videos

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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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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Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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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.
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Structural Protein Function01:56

Structural Protein Function

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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Assembly of Complex Microtubule Structures01:32

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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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Related Experiment Video

Updated: Jun 24, 2025

Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Deciphering vimentin assembly: Bridging theoretical models and experimental approaches.

Soyeon Jeong1, Nam-Chul Ha1

  • 1Department of Agricultural Biotechnology, Center for Food and Bioconversions, and Research Institute for Agriculture and Life Sciences, CALS, Seoul National University, Seoul 08826, Republic of Korea.

Molecules and Cells
|June 13, 2024
PubMed
Summary

Vimentin intermediate filaments (IFs) assembly from soluble tetramers to mature filaments was investigated. A novel sequence highlights helical turns and tetramer gap filling, clarifying vimentin

Keywords:
Cytoplasmic intermediate filamentStructural assemblyTheoretical modelingTube-like filamentVimentin

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Area of Science:

  • Cytoskeletal biology
  • Biophysics
  • Molecular and cell biology

Background:

  • Vimentin intermediate filaments (IFs) are crucial cytoskeletal components in eukaryotic cells.
  • The precise mechanism of vimentin IF assembly remains poorly understood.
  • Understanding IF assembly is vital for cell structure and function.

Purpose of the Study:

  • To elucidate the assembly pathway of vimentin intermediate filaments.
  • To investigate the transition from soluble vimentin tetramers to mature 11-nm filaments.
  • To address the gap in knowledge regarding IF formation dynamics.

Main Methods:

  • Theoretical modeling of vimentin assembly.
  • Analysis of experimental data on vimentin polymerization.
  • In silico simulation of filament formation.

Main Results:

  • A novel stepwise assembly sequence for vimentin IFs was proposed.
  • The model emphasizes the role of helical turns in filament elongation.
  • Soluble tetrameric vimentin units were shown to fill gaps during assembly.

Conclusions:

  • The proposed model provides new insights into vimentin structural dynamics.
  • Findings contribute to a broader understanding of intermediate filament assembly principles.
  • This work clarifies a fundamental process in cytoskeletal organization.