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Related Concept Videos

Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

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Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
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Generation of Straight or Branched Actin Filaments01:14

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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.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
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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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Formation of Higher-order Actin Filaments01:11

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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.
The high-order actin...
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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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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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Related Experiment Video

Updated: May 9, 2025

Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles

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Filamin C dimerisation is regulated by HSPB7.

Zihao Wang1,2,3, Guodong Cao1,2, Miranda P Collier1,2

  • 1Department of Chemistry, Dorothy Crowfoot Hodgkin Building, University of Oxford, Oxford, UK.

Nature Communications
|May 1, 2025
PubMed
Summary
This summary is machine-generated.

Filamin C (FLNC) dimer formation is regulated by HSPB7, a cardiac chaperone. This interaction impacts FLNC’s role in muscle biomechanics and disease, with evolutionary roots in early chordates.

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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Filamin C (FLNC) is crucial for striated muscle biomechanics and its dysfunction causes cardiomyopathies.
  • The molecular regulation of FLNC, particularly its interactions, remains incompletely understood.
  • HSPB7 is a cardiac-specific molecular chaperone essential for embryonic development.

Purpose of the Study:

  • To investigate the interaction between FLNC and HSPB7.
  • To elucidate the structural and functional consequences of this interaction.
  • To understand the regulatory mechanisms of FLNC dimerization.

Main Methods:

  • X-ray crystallography to determine the hetero-dimer structure.
  • Quantitative biochemical analyses of dimer formation.
  • Evolutionary analysis and ancestral sequence reconstruction.

Main Results:

  • FLNC and HSPB7 form a stable hetero-dimer under biomechanical stress, outcompeting the FLNC homo-dimer.
  • This hetero-dimerization potentially reduces FLNC's ability to cross-link actin and increases its mobility.
  • Phosphorylation sites on FLNC differentially regulate homo- and hetero-dimer formation.
  • The FLNC-HSPB7 interaction and its regulation evolved around the time of primitive heart development in chordates.

Conclusions:

  • HSPB7 acts as a specific molecular chaperone regulating FLNC dimerization.
  • This regulation impacts FLNC's function in cardiac tissue under stress.
  • The findings provide structural insights into FLNC regulation and its evolutionary history.