Related Experiment Video

Updated: Jun 2, 2026

Reconstitution of Actin-Based Motility with Commercially Available Proteins
08:40

Reconstitution of Actin-Based Motility with Commercially Available Proteins

Published on: October 28, 2022

Competition between Blown fuse and WASP for WIP binding regulates the dynamics of WASP-dependent actin polymerization

Peng Jin1, Rui Duan, Fengbao Luo

  • 1Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Developmental Cell
|May 17, 2011
PubMed

Insights

Blown fuse (Blow) regulates actin dynamics during Drosophila muscle development. It controls the stability of the WASP-WIP complex, promoting fusion-competent myoblast invasion for cell fusion.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Cytoskeleton Dynamics

Background:

  • Actin cytoskeleton rearrangements are crucial for cellular processes.
  • Myoblast fusion in Drosophila involves actin-rich podosome-like structures (PLS).
  • The protein Blown fuse (Blow) is essential for myoblast fusion, but its function is unknown.

Purpose of the Study:

  • To elucidate the molecular function of Blown fuse (Blow) in myoblast fusion.
  • To investigate Blow's role in regulating the actin cytoskeleton during cell fusion.

Main Methods:

  • Co-localization studies of Blow with WASP, WIP/Solitary, and actin within the PLS.
  • Biochemical assays to determine Blow's effect on the WASP-WIP complex stability.
  • Analysis of Blow's function in Drosophila myoblast fusion.

Main Results:

  • Blow is an FCM-specific protein found within the PLS.
  • Blow competes with WASP for WIP binding, destabilizing the WASP-WIP complex.
  • This modulation leads to rapid exchange of WASP, WIP, and G-actin in the PLS, driving cell invasion and fusion pore formation.

Conclusions:

  • Blown fuse (Blow) is a key regulator of actin dynamics in myoblast fusion.
  • Blow controls the stability of the WASP-WIP complex to modulate actin cytoskeletal dynamics.
  • Blow's function is critical for the invasive process of myoblast fusion in Drosophila.

More Related Videos

Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles08:02

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

Published on: May 5, 2022

Aip1p Dynamics Are Altered by the R256H Mutation in Actin08:57

Aip1p Dynamics Are Altered by the R256H Mutation in Actin

Published on: July 30, 2014

Related Concept Videos

Actin Filament Depolymerization01:19

Actin Filament Depolymerization

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).
In F-actin, the ADF/cofilin proteins...
Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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...
Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

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 networks...
Mechanism of Lamellipodia Formation01:31

Mechanism of Lamellipodia Formation

Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

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.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Actin Polymerization01:42

Actin Polymerization

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.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight actin...