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

Abstract:

:Dynamic rearrangements of the actin cytoskeleton play a key role in numerous cellular processes. In Drosophila, fusion between a muscle founder cell and a fusion competent myoblast (FCM) is mediated by an invasive, F-actin-enriched podosome-like structure (PLS). Here, we show that the dynamics of the PLS is controlled by Blown fuse (Blow), a cytoplasmic protein required for myoblast fusion but whose molecular function has been elusive. We demonstrate that Blow is an FCM-specific protein that colocalizes with WASP, WIP/Solitary, and the actin focus within the PLS. Biochemically, Blow modulates the stability of the WASP-WIP complex by competing with WASP for WIP binding, leading to a rapid exchange of WASP, WIP and G-actin within the PLS, which, in turn, actively invades the adjacent founder cell to promote fusion pore formation. These studies identify a regulatory protein that modulates the actin cytoskeletal dynamics by controlling the stability of the WASP-WIP complex.

journal_name

Dev Cell

journal_title

Developmental cell

authors

Jin P,Duan R,Luo F,Zhang G,Hong SN,Chen EH

doi

10.1016/j.devcel.2011.04.007

subject

Has Abstract

pub_date

2011-05-17 00:00:00

pages

623-38

issue

5

eissn

1534-5807

issn

1878-1551

pii

S1534-5807(11)00158-4

journal_volume

20

pub_type

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